JP3910487B2 - Game system and game program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a game system and a game program that use an inclination sensor, and more particularly to a game system and a game program that change a game image in accordance with an output of the inclination sensor.
[0002]
[Prior art]
A game system using an inclination sensor is disclosed in Japanese Patent Laid-Open No. 2001-170358 (hereinafter referred to as “prior art”). In this prior art, when a portable game device or game controller (hereinafter referred to as “game device or the like”) is tilted, a figure (object) such as a player character is tilted in the tilted direction. ) Is generated (rolled). By generating such a game image, the player can feel as if the game space is tilted in conjunction with the tilt of the game device or the like.
[0003]
[Problems to be solved by the invention]
  However, the above-mentioned prior artIsThere was no processing related to the light expression in the room space, and it lacked realism.
  In addition, in the above-described conventional technology, a player can be given a feeling as if the game space is tilted according to the tilt of the game device or the like, but a technique for further enhancing the sense has been demanded.
[0004]
  Therefore, the present inventionIs leaningAn object of the present invention is to provide a game system and a game program that can perform processing related to light in a game space according to the output of an inclination sensor in a game system or game program that uses a motion sensor.
  Furthermore, an object of the present invention is to provide a game system and a game program that can give a player a sense that the game space is tilted according to the tilt of the game device or the like.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention is configured as follows.The
[0009]
  The invention described in claim 1 is a game system (game system 30) that displays on a display means a three-dimensional game space in which a plurality of objects exist. This game system includes a housing (housing 11 or housing 91) held by a player, and the housing provided on the housing.When rotating around a predetermined axisDepending on the tilt sensor (acceleration sensor 154 or acceleration sensor 93) and the output value of the tilt sensorCentering on a predetermined axis in the game space corresponding to the predetermined axis in the housing, the basic coordinates of the light source in the game space are rotated in the direction opposite to the tilt direction, and the coordinates after the rotational movement are the coordinates of the light source. DoIt is changed by the light source coordinate changing means (CPU 401 that executes S105) and the light source coordinate changing means.LightShadow image processing means (CPU 401 that executes S106) that generates a shadow as image processing of three-dimensional graphics according to the coordinates of the source, generates a shadow of the object, and displays it on the display means; Is provided. The light source coordinate changing means changes the coordinates of the light source according to the output value of the tilt sensor, so that a change in the shadow display state (direction and length of the shadow extension) is expressed according to the tilt of the housing.
[0012]
  Claim2The invention described inA game system that displays a three-dimensional game space in which a plurality of objects exist on a display means. The game system includes a housing held by a player, an inclination sensor provided in the housing for detecting an inclination of the housing, and a game space.Light source basic coordinate determining means for determining the basic coordinates of the light source;According to the output value of the tilt sensor,A predetermined axis is determined according to a tilt direction detected by the tilt sensor, and the basic coordinates of the light source determined by the light source basic coordinate determining means are rotated in a direction opposite to the tilt direction around the predetermined axis. The coordinates after the rotational movement are the coordinates of the light source.A light source coordinate changing unit that generates a shadow as an image process of three-dimensional graphics according to the coordinates of the light source changed by the light source coordinate changing unit, and generates a shadow of the object A shadow image processing means for displaying on the display means.Light source basic coordinateschangeThe means is, for example, a predetermined direction from the player object (45 on the Z axis and the XZ plane of the local coordinate system of the player object).Every timeIs the negative direction (the direction of the axis 112), and the XZ plane and 45Every timeThe light source is determined at a position separated by a predetermined distance (D2) in the direction (the direction of the axis 113) forming the (Y-axis plus direction). The basic coordinates of the light source are fixed positions with respect to a predetermined object (player object) (as described above, 45 on the Z axis and XZ plane of the local coordinate system of the player object).Every timeIs the negative direction (the direction of the axis 112), and the XZ plane and 45Every time(A position that is a predetermined distance (D2) away in the direction (the direction of the axis 113) that forms the (Y-axis plus direction))), but may not be determined as a fixed position, depending on the situation The position may be changed (for example, when the movement of the sun due to a time change is expressed). The tilt sensor detects the tilt of the housing in a predetermined direction (X-axis direction or Z-axis direction in FIG. 3). The light source coordinate determining means determines a predetermined axis (axis 108 or axis 110) according to the tilt direction detected by the tilt sensor, and the light source coordinate determining means is determined by the light source basic coordinate determining means around the predetermined axis. The basic coordinates (light source basic coordinates 114) are rotated in the direction opposite to the tilt direction, and the coordinates after the rotation (light source coordinates 115) are set as the coordinates of the light source (S1053 and S1055).
[0013]
  Claim3The invention described in claim 12In the game system described in the above, the processing is performed when the inclination of the housing in the left-right direction (X-axis direction in FIG. 3) (in other words, the inclination when rotating around the Z-axis in FIG. 3) is detected. There is a characteristic. In the present invention, the left-right direction is the direction that becomes the left-right direction when the player holds the housing, and corresponds to the X-axis direction in FIG. When the tilt sensor detects such a tilt, the light source coordinate determining means determines that “the Z axis (axis 120) of the viewpoint coordinate system is the X of the world coordinate system.ZAxis projected on plane (axis 110) "“Axis of Z-axis of viewpoint coordinate system projected on XZ plane of local coordinate system of player object” “Z-axis of local coordinate system of player object” “Z-axis of viewpoint coordinate system” “Z-axis of viewpoint coordinate system of ground One of the axes projected onto the object, The basic coordinates of the light source are rotated in the direction opposite to the direction of the inclination, and the coordinates after the rotational movement (light source coordinates 115) are set as the coordinates of the light source (S1053).
[0014]
  Claim4The invention described in claim 12In the game system described in the above, the processing is performed when the inclination of the housing in the front-rear direction (Z-axis direction in FIG. 3) (in other words, the inclination when rotating around the X-axis in FIG. 3) is detected. There is a characteristic. In the present invention, the front-rear direction is a direction that becomes the front-rear direction (that is, the depth direction) when the player holds the housing, and corresponds to the direction of the Z axis in FIG. Light source coordinateschangeWhen the tilt sensor detects the tilt in such a direction, the basic coordinates of the light source are rotated in the direction opposite to the tilt direction around the axis (axis 108) that satisfies all of the following three conditions: The coordinates after the rotational movement (light source coordinates 115) are set as the coordinates of the light source (S1055).
(1) The Z axis of the viewpoint coordinate system is orthogonal to the axis projected on the XZ plane of the world coordinate system
(2) Exists on the XZ plane of the world coordinate system
(3) Go through the gazing point
[0015]
  Claim5The invention described in claim 12Or4The game system according to claim 1, wherein the light source coordinateschangeThe means reverses the basic coordinates of the light source (light source basic coordinates 114) by the same angle as the angle of inclination detected by the inclination sensor (inclination angle from the horizontal plane or inclination angle from the basic position) around the predetermined axis. The coordinates after rotation (light source coordinates 115) are set as the coordinates of the light source (S1053 or S1055).
[0018]
  Claim6The invention described in claim 12The light source basic coordinateschangeThe means determines the basic coordinates of the light source as a fixed direction and / or distance with respect to a predetermined object (player object) (S1051). For example, 45 on the Z axis and the XZ plane of the local coordinate system of the player objectEvery timeIs the negative direction (the direction of the axis 112), and the XZ plane and 45Every timeThe position is determined by a predetermined distance (D2) in the direction (the direction of the shaft 113) that forms the (Y-axis plus direction).
[0020]
  Claim7The invention described in claim 11The game system according to claim 1, further comprising basic position determination means (CPU 401 that executes S2) for determining the basic position of the housing.The basic position determining means holds the output value of the tilt sensor at the basic position.Also, light source coordinateschangeMeansWhen the output value of the tilt sensor is equal to the output value held by the basic position determining means, the light source is set to the basic coordinates, and the output value of the tilt sensor is corrected with the output value held by the basic position determining means Displacement from the basic coordinates of the light source according to the measured valueDecide(S1042, S1044). When the player holds the housing at the basic position, the light source is determined at the basic coordinates (light source basic coordinates 114). Further, when the player grips the housing in a state tilted from the basic position in a predetermined direction, the light source coordinates (light source coordinates 115) are determined to be coordinates obtained by rotationally moving the basic coordinates in the direction opposite to the tilt direction. Is done. Here, the basic position means that the housing tilt is 0Every timeThis position includes a case where it is fixedly determined in advance by the game system and a case where it is arbitrarily determined by the player. In the former case, for example, the horizontal position is determined as the basic position. In the latter case, the player can easily hold the housing according to the player's preference, and in the case of a portable game device, the player can easily view the game screen. Determined arbitrarily.
[0039]
【The invention's effect]
[0043]
  Claim 1,2,8, 9According to the invention described in the above, it is possible to give the player a new operational feeling that the coordinates of the light source are changed in accordance with the inclination of the housing to change the image effect relating to light in the game image. In addition, it is possible to provide a game image in which the state of light hitting an object or the like existing in the game space changes according to the inclination of the housing.
[0051]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an external view showing a game system 14 according to a first embodiment of the present invention. The game system 14 includes a portable game device 10 and a game cartridge 15. The portable game device 10 includes a housing 11 having a rectangular shape. A liquid crystal display (hereinafter referred to as “LCD”) 12 is provided on one main surface (front surface) of the housing 11, and an operation switch 13 is mounted with the LCD 12 interposed therebetween. The operation switch 13 is a switch for a player to input an operation signal for game operation. A direction instruction switch 131, a start switch 132, and a select switch 133 are arranged on the left side of the LCD 12, and an operation instruction switch (A button , B buttons) 13a, 13b are arranged on the right side of the LCD 12, and other operation switches 13R, 13L are arranged on the left and right of the upper side surface of the housing 11 as required. The direction instruction switch 131 is mainly used for instructing the moving direction of the game character. The action instruction switches 13a and 13b are mainly used for action instructions (jump, kick, throw, etc.) of the game character. The start switch 132 is used for a game start instruction, and the select switch 133 is used for selecting a menu displayed on the screen.
[0052]
Furthermore, a cartridge insertion hole (not shown) for detachably mounting a game cartridge (hereinafter referred to as “cartridge”) 15 is formed in the upper rear portion of the portable game apparatus 10, and a connector ( 2) is provided. The cartridge 15 incorporates a semiconductor memory (ROM 152, RAM 153, acceleration sensor 154 shown in FIG. 2) in a housing 151.
[0053]
FIG. 2 is a block diagram of the game system 14. The portable game device 10 includes a control circuit (for example, a CPU chip) 20. The control circuit 20 includes a CPU core 21. An LCD controller 23, work RAM 24, video RAM 25, and interface circuit 26 are connected to the CPU core 21 via a bus (address bus and data bus) 22. An operation switch 13, a connector 27, and a sound circuit 28 are connected to the control circuit 20. A speaker 29 is connected to the sound circuit 28. Prior to the start of the game, a desired cartridge 15 is attached to the connector 27. The player (user) can play desired game software by exchanging the cartridge 15.
[0054]
The CPU core 21 of the control circuit 20 reads the game program from the cartridge 15 connected to the connector 27, executes the game process based on the operation signal input by the operation switch 13 and the program, and stores the data being processed. The image data is temporarily stored in the video RAM 25 while being stored in the work RAM 24. The CPU core 21 gives the display data temporarily stored in the video RAM 25 to the LCD controller 23 in accordance with the display timing. The LCD controller 23 performs display control for causing the LCD 12 to display the image data supplied from the CPU core 21. Further, the CPU core 21 generates sound data of game music or sound effects according to the progress of the game based on the game program, and provides the sound circuit 28 with the sound data. The sound circuit 28 includes a DA conversion circuit and an amplifier circuit. The sound circuit 28 converts sound data into a sound signal (analog signal) and appropriately amplifies the sound data to be output from the speaker 29.
[0055]
On the other hand, the game cartridge 15 includes a ROM 152, a RAM 153, and an acceleration sensor 154. The ROM 152 stores a game program and various data used for the game program in a fixed manner, and details will be described with reference to FIG.
The RAM 153 stores game data obtained by executing the game program in a rewritable and nonvolatile manner. The game data stored in the RAM 153 includes, for example, backup data (e.g., acquired item, monster, life, number of advanced maps, etc.) indicating progress when the game is finished.
The acceleration sensor 154 is a biaxial acceleration sensor that outputs the magnitude of the inclination in two directions by detecting gravity. The acceleration sensor 154 is disposed in the cartridge 15 so as to be able to detect the horizontal and vertical inclinations of the cartridge 15 on the paper surface in FIG. Since the cartridge 15 is attached to the portable game apparatus 10, the acceleration sensor 154 detects the horizontal and vertical inclinations of the portable game apparatus 10 on the paper surface in FIG. Referring to FIG. 3, when the portable game apparatus 10 is held horizontally, the X axis, the Y axis, and the Z axis of the portable game apparatus 10 are defined as follows. That is, the X axis is a horizontal and horizontal axis, the Z axis is a horizontal and depth axis, and the Z axis is a vertical axis. The acceleration sensor 154 includes an inclination in the X-axis direction in FIG. 3 of the portable game device 10 (in other words, an inclination when rotating about the Z-axis) and an inclination in the Z-axis direction (in other words, centering on the X-axis). As a tilt). In addition, as shown in FIG. 3, the plus / minus direction of the inclination in each axis direction is defined as a plus direction when the axis is viewed from the plus direction, and a minus direction is defined as a minus direction. . In the following description, the X axis shown in FIG. 3 may be simply referred to as “X axis”, and the Z axis shown in FIG. 3 may be simply referred to as “Z axis”.
[0056]
FIG. 4 is a diagram showing data stored in the ROM 152. The ROM 152 includes a game program storage area 152a that stores a game program, and areas (152b to 152f) that store various data used for the game program. Image data (101 shown in FIG. 6) indicating the player object is stored in the player object image data storage area 152b. In the non-player object image data storage area 152c, image data indicating a non-player object (not shown, but similar to image data indicating a player object and image data representing the appearance of the non-player object) is stored in each non-player object image data storage area 152c. Stored for each player object. The player object shadow image data storage area 152d stores image data indicating the shadow of the player object (102 shown in FIG. 6). In the non-player object shadow image data storage area 152e, image data indicating the shadow of the non-player object (not shown, but the same data as the image data indicating the shadow of the player object, which represents the appearance of the shadow of the non-player object) Image data) is stored for each non-player object. The other data storage area 152f stores other various data (for example, terrain object data, audio data, etc.) used for the game program.
[0057]
FIG. 5 is a diagram showing data stored in the work RAM 24. The work RAM 24 stores temporary data generated in the game process. In the acceleration sensor output value storage area 241, the X-axis direction output value (OutX) corresponding to the X-axis direction tilt amount (tilt angle) output from the acceleration sensor 154 and the Z-axis direction tilt amount (tilt angle) are stored. The corresponding Z-axis direction output value (OutZ) is stored. When the portable game device 10 is tilted in the positive direction of the X-axis direction (see FIG. 3), the output value in the X-axis direction is positive, and when it is tilted in the negative direction of the X-axis direction (see FIG. 3) The direction output value is negative. Further, when the portable game device 10 is tilted in the positive direction of the Z-axis direction (see FIG. 3), the output value in the Z-axis direction is positive, and when the mobile game device 10 is tilted in the negative direction of the Z-axis direction (see FIG. 3) The direction output value is negative.
[0058]
The player object position data storage area 242 stores position data (Px, Py) in the world coordinate system of a player object that moves when the player operates an operation switch or the like. In the non-player object position data storage area 243, position data in the world coordinate system of non-player objects that are automatically moved by the game program is stored for each non-player object. In the basic position data storage area 244, the output value of the acceleration sensor 154 corresponding to the basic position (position where the inclination of the portable game apparatus 10 is treated as 0 °) determined prior to the start of the game is stored on the X axis. Each of the direction output value and the Z-axis direction output value is stored. The other game variable data storage area 245 stores other game variable data (for example, life force data of the player object, data such as possessed items).
[0059]
FIG. 6A is a diagram showing an example of an image represented by the image data of the player object stored in the player object image data storage area 152b of FIG. In this embodiment, the character is a player object 101 (a character that has a sword and a shield and fights a monster that is a non-player object) 101. FIG. 6B is a diagram showing an example of a shadow image represented by the shadow image data of the player object stored in the player object shadow image data storage area 152d of FIG. By synthesizing the image of the player object and the shadow image of the player object, a player object (with a shadow) as shown in FIG. 6C is displayed on the LCD 12. FIG. 6C corresponds to an image displayed when the portable game device is in the basic position.
[0060]
7 and 8 are diagrams for explaining the outline of the image display process that is a feature of the present invention. FIG. 7 shows how the player object (shaded) image displayed on the LCD 12 when the portable game apparatus 10 is tilted in the positive direction of the X-axis (in other words, rotated around the Z-axis). It is a figure which shows whether it is produced | generated.
[0061]
FIG. 7A is a diagram for explaining a case where the amount of tilt of the portable game apparatus 10 is small (when the output value (OutX) of the acceleration sensor output value is small). (A1) shows the shadow image of the player object stored in the player object shadow image data storage area 152d in FIG. 4 (hereinafter, the player object stored in the player object shadow image data storage area 152d in FIG. 4). Are called “basic shadow images”). First, a process of rotating or inverting the basic shadow image (a1) according to the tilt direction of the portable game apparatus 10 is performed. Specifically, in the case of FIG. 7A, a process of rotating the image (90 ° clockwise rotation) is performed in response to the portable game device 10 being tilted in the plus direction of the X axis direction. (The image after the rotation processing is (a2)). Further, (a2) a process of expanding / contracting the image (a process of extending or contracting the image in a predetermined direction) is performed according to the inclination of the portable game apparatus 10. In the case of FIG. 7A, since the amount of tilt of the portable game apparatus 10 is relatively small, a process of shrinking the image is performed (based on the fact that the portable game apparatus 10 is tilted in the plus direction of the X axis direction). The direction of shrinking is the left-right direction). The image after such expansion / contraction processing is (a3). The shadow image data (a3) generated in this way is combined with the player object image data, and a player object (with a shadow) like (a4) is displayed on the LCD 12. In the synthesis process, based on the fact that the portable game apparatus 10 is tilted in the plus direction in the X-axis direction, the shadow image data is arranged and synthesized on the right side with the foot of the player object image as the center.
[0062]
The image shown in FIG. 7 (a4) has a shadow extending direction by 90 ° clockwise as compared with the image when the portable game device is in the basic position (FIG. 6 (c)). The length is shortened.
[0063]
FIG. 7B is a diagram for explaining a case where the amount of tilt of the portable game apparatus 10 is large (when the X-axis direction output value (OutX) of the acceleration sensor output value is large). The processing from (b1) to (b2) in FIG. 7 is the same as the processing from (a1) to (a2) in FIG. In the expansion / contraction process after FIG. 7 (b2), a process of stretching the image is performed in accordance with the large amount of tilt of the portable game apparatus 10 (the portable game apparatus 10 is tilted in the positive direction of the X axis direction). Based on this, the extending direction is the left-right direction). The shadow image data (b3) generated in this way is combined with the player object image data, and a player object (with a shadow) like (b4) is displayed on the LCD 12. In the synthesis process, based on the fact that the portable game apparatus 10 is tilted in the plus direction in the X-axis direction, the shadow image data is arranged and synthesized on the right side with the foot of the player object image as the center.
[0064]
(B4) The image has a longer shadow length compared to the image when the amount of tilt is small ((a4) in FIG. 7).
[0065]
FIG. 8 shows how the player object (shaded) image displayed on the LCD 12 is displayed when the portable game apparatus 10 is tilted in the positive direction of the Z axis (in other words, rotated around the X axis). It is a figure which shows whether it produces | generates.
[0066]
FIG. 8A is a diagram for explaining a case where the amount of tilt of the portable game apparatus 10 is small (when the Z-axis direction output value (OutZ) of the acceleration sensor output value is small). First, a process of rotating or inverting the basic shadow image according to the tilt direction of the portable game apparatus 10 is performed. Specifically, in the case of FIG. 8A, a process of inverting the image is performed according to the fact that the portable game apparatus 10 is tilted in the positive direction of the Z axis direction (the image after the inverting process is (A2)). Further, (a2) a process of expanding / contracting the image (a process of extending or contracting the image in a predetermined direction) is performed according to the inclination of the portable game apparatus 10. In the case of FIG. 8A, since the amount of tilt of the portable game apparatus 10 is relatively small, a process of shrinking the image is performed (shrink based on the fact that the portable game apparatus 10 is tilted in the Z-axis direction). The direction is the vertical direction). The image after such expansion / contraction processing is (a3). The shadow image data (a3) generated in this way is combined with the player object image data, and a player object (with a shadow) like (a4) is displayed on the LCD 12. In the synthesis process, the shadow image data is arranged below the player object image around the base of the player object image based on the fact that the portable game apparatus 10 is tilted in the positive direction of the Z-axis direction.
[0067]
The image in FIG. 8 (a4) is opposite in the direction in which the shadow extends and the length in which the shadow extends is shorter than the image when the portable game device is in the basic position ((c) in FIG. 6). ing.
[0068]
FIG. 8B is a diagram for explaining the case where the amount of tilt of the portable game apparatus 10 is large (when the output value (OutZ) of the acceleration sensor output value is large). The processing from (b1) to (b2) in FIG. 8 is the same as the processing from (a1) to (a2) in FIG. In the expansion / contraction process after FIG. 8 (b2), a process of stretching the image is performed in accordance with the large amount of tilt of the portable game device 10 (the portable game device 10 is tilted in the positive direction of the Z-axis direction). Based on this, the extending direction is the vertical direction). The shadow image data (b3) generated in this way is combined with the player object image data, and a player object (with a shadow) like (b4) is displayed on the LCD 12. In the synthesis process, the shadow image data is arranged below the player object image around the base of the player object image based on the fact that the portable game apparatus 10 is tilted in the positive direction of the Z-axis direction.
[0069]
The image of FIG. 8 (b4) has a longer shadow length compared to the image when the amount of tilt is small ((a4) of FIG. 8).
[0070]
Although not shown, when the portable game apparatus 10 is tilted in the negative direction of the X-axis (when the output value (OutX) of the acceleration sensor output value is smaller than 0), the basic shadow image is counterclockwise. A process of rotating is performed, and further, a process of expanding and contracting according to the magnitude of the inclination is performed. Then, the player object image and the shadow image are synthesized by synthesizing the shadow image to the left centering on the foot of the player object image.
[0071]
Further, when the portable game device 10 is tilted in the negative direction of the Z-axis direction (when the Z-axis direction output value (OutZ) of the acceleration sensor output value is smaller than 0), the rotation inversion process is not performed and the basic shadow image is displayed. Only the process of extending in the vertical direction is performed. The player object image and the shadow image are combined with the shadow image above the foot of the player object image.
[0072]
Furthermore, FIG. 9 shows a case where the portable game apparatus 10 is rotating in an oblique direction. In this case, both the X-axis direction output value (OutX) and the Z-axis direction output value (OutZ) of the acceleration sensor output value are non-zero values. As described above, when the tilt is in the direction of an axis different from the X axis or the Z axis, the basic shadow image is rotated according to the tilt direction. The direction of the inclination is determined based on the relationship between the X-axis direction output value and the Z-axis direction output value of the acceleration sensor output value (for example, if the X-axis direction output value and the Z-axis direction output value are the same value). For example, the direction of inclination at that time is a direction that forms 45 ° with respect to the X axis and the Z axis).
[0073]
As shown in FIG. 9, when the mobile game apparatus 10 is tilted in the oblique direction, the basic shadow image is rotated so that the shadow extends in the tilt direction. For example, when the image is tilted in the direction of the A axis shown in FIG. 9, the image is rotated in the direction of the A axis. In addition, expansion / contraction processing is performed according to the amount of tilt of the portable game device 10, and a shadow image is arranged in the tilt direction around the foot of the player object image and synthesized.
[0074]
Although the processing for generating the image of the player object (with shadow) has been described above, the processing for generating the image of the non-player object (with shadow) is similarly performed.
[0075]
In the above description, the figure that changes in accordance with the inclination is a shadow image. However, the figure that changes in accordance with the inclination is not limited to this, and a liquid (or gas) character may be inclined. The image data to be processed is only changed even when it is deformed according to the display (displayed to extend in the direction of inclination), or when the spotlight is deformed according to the inclination, etc. Can do.
[0076]
10 to 12 are flowcharts of programs included in the game program stored in the ROM 152 of the cartridge 15 and executed by the control circuit 20.
[0077]
FIG. 10 is a diagram showing a main flow. First, in S1, various game variable initialization processes are performed. Next, in S2, basic position determination processing is performed. Specifically, after the player holds the portable game apparatus 10 at a favorite position, the determination button (for example, the operation switch 13a) is operated. Then, the output values (X-axis direction output value and Z-axis direction output value) of the acceleration sensor 154 when the operation switch 13a is operated are stored in the basic position data storage area 244 of FIG. After S2, game processing is performed in S3. The game process will be described in detail with reference to FIG.
[0078]
FIG. 11 is a flowchart showing details of the game process in S3 of FIG. First, in S4, input detection processing of the operation switch 13 is performed. Note that the player operates the operation switch 13 for an instruction to move the player object. After S4, acceleration sensor input detection processing is performed in S5. Specifically, the X-axis direction output value and the Z-axis direction output value output from the acceleration sensor 154 are stored in the acceleration sensor output value storage area 241 in FIG.
[0079]
After S5, in S6, player object placement processing is performed. Specifically, based on the operation switch operation information detected in the operation switch input detection process (S4), a process for moving the player object is performed, and the position in the game space after the player object is moved is determined. It is stored in the aforementioned player object position data storage area 242 of FIG.
[0080]
After S6, non-player object placement processing is performed in S7. Specifically, the non-player object movement process is performed based on the non-player object movement program included in the game program, and the position in the game space after the movement of the non-player object is determined. The non-player object position data storage area 243 is stored.
[0081]
After S7, shadow arrangement processing is performed in S8 and S9. In this process, as described above with reference to FIGS. 7 to 9, the basic shadow image is rotated and inverted and expanded / reduced according to the inclination of the portable game apparatus 10 to be combined with the player object image or the non-player object image. Processing is performed. S8 is a shadow placement process related to the player object, and S9 is a shadow placement process related to the non-player object. Both of the processing contents are the same, and details will be described later with reference to FIG.
[0082]
After S9, other game processes are performed in S10. Specifically, a battle process between the player object and the non-player object is performed.
[0083]
After S10, display processing is performed in S11. Specifically, based on the data in the player object position data storage area 242 and the non-player object position data storage area 243 of FIG. 5 described above, the player object image and the non-player object image are written into the VRAM 25, and the terrain image is also stored. It is written in the VRAM 25. At this time, the image of the player object and the non-player object combined with the shadow image in S8 and S9 is written in the VRAM 25.
[0084]
After S11, it is determined in S12 whether the game is over. For example, it is determined whether or not the vitality of the player object is 0, whether or not the time is over, and the like. If it is determined that the game is over, the game process is terminated. If it is determined that the game is not over, the process returns to S4 and the processes of S4 to S12 are repeated.
[0085]
FIG. 12 is a flowchart showing details of the shadow arrangement process in S8 and S9 of FIG. The process in this flowchart is a flowchart corresponding to the process described above with reference to FIGS. First, in S81, processing for subtracting the data in the basic position data storage area 244 from the data in the acceleration sensor output value storage area 241 shown in FIG. 5 is performed. Specifically, a process of subtracting SX from OutX and a process of subtracting SZ from OutZ are performed. By this process, a game process with the basic position set to 0 ° is performed.
[0086]
After S81, in S82, processing for determining the direction in which the shadow extends is performed according to the value calculated in S81 (that is, according to the tilt direction of the portable game device). Then, after S82, in S83, a process of rotating or inverting the basic shadow image is performed according to the direction in which the shadow determined in S82 extends.
[0087]
Specifically, when determining the rotation amount θ of the basic shadow image from the output value of the acceleration sensor (X-axis direction output value: OutX, Z-axis direction output value: OutZ), for example, θ satisfying the following equation (1): It is good.
tan θ = OutX / OutZ (Formula 1)
[0088]
After S83, in S84, processing for determining the length of the shadow is performed according to the value calculated in S81 (that is, according to the inclination of the portable game device). After S84, in S85, in accordance with the length of the shadow determined in S84, the process of extending the image after S83 (after rotation or reversal) in the direction of the shadow determined in S82 Or the shrinking process is performed.
[0089]
Specifically, when determining the expansion / contraction amount of the shadow image from the output value (X-axis direction output value: OutX, Z-axis direction output value: OutZ) of the acceleration sensor, for example, even if m satisfies the following expression (2): Good.
m²= (OutX²+ OutZ²/ M ... (Formula 2)
(M is a constant)
[0090]
After S85, in S86, the shadow image processed in S81-S85 is arranged around the player object or the non-player object according to the inclination of the portable game device 10, and the shadow image is processed. The placement process ends.
[0091]
FIG. 13 is an external view of a game system 30 according to the second embodiment of the present invention. This game system includes a game device 40, a DVD-ROM 50, a memory card 60, and the game system 14 of the first embodiment described above. The memory card 60 is selectively employed.
[0092]
The DVD-ROM 50 and the memory card 60 are configured to be detachable from the game apparatus 40. The game system 14 and the game device 40 are connected by a communication cable 70 a, and the communication cable 70 b connected to the game device 40 is connected to the television 80. The game apparatus 40 has a plurality of connectors for connecting the game system 14 or a controller (not shown), and the game system 14 is connected to one of these connectors. Note that communication between the game system 14 and the game apparatus 40 may be performed wirelessly without using a communication cable.
[0093]
The DVD-ROM 50 fixedly stores data necessary for playing a game, such as a game program and image data. When the player plays a game, the DVD-ROM 50 is attached to the game machine device 40. The memory card 60 is composed of a rewritable storage medium, and is used to save the state during the game. It should be noted that other storage media (memory cartridge, CD-ROM, etc.) may be used in place of the DVD-ROM 50 in order to store game programs and the like. The game device 40 reads the game program recorded on the DVD-ROM 50 and executes game processing.
[0094]
The game system 14 is used as a simple operation input device in this embodiment. The game apparatus 10 constituting the game system 14 can execute the game process independently by mounting the cartridge, and the game process proceeds in conjunction with the game apparatus 10 while displaying the game screen on the LCD 12. Anyway. However, in this embodiment, description of such linked game processing is omitted, and the game system 14 is used only as an operation input device (that is, the game system 14 simply uses operation data and the like as a game device). Only process to send to). As described above with reference to FIG. 1, the portable game device 10 constituting the game system 14 includes various operation switches 13, and outputs operation inputs to the game device 40 in response to pressing of the switches by the player. Similarly, the output from the acceleration sensor 154 included in the cartridge 15 attached to the portable game apparatus 10 is also output to the game apparatus 40 via the communication cable 70a.
$
The television 80 displays the video signal output from the game device 40 on the screen. In addition, the television 80 has a built-in speaker, and an audio signal output from the game apparatus 40 is output.
[0095]
FIG. 14 is a block diagram showing a hardware configuration of game system 30 shown in FIG. In FIG. 13, the game apparatus 40 includes a calculation unit (CPU 401, graphics processing unit (GPU) 402 and DSP 406), a storage unit (main memory 405, color buffer 403, Z buffer 404, and sub memory 407), various types Interface (I / F) sections (409 to 412 and 414), a memory controller 408, and a DVD drive 413. As shown in FIG. 14, the memory controller 408 connects the arithmetic unit, the storage unit, and the interface unit to each other, and controls data transfer between these components.
[0096]
The DVD drive 413 drives the DVD-ROM 50 attached to the game machine body 1. The DVD-ROM 50 stores game programs and various game data. The game program recorded on the DVD-ROM 50 is loaded into the main memory 405 via the DVD disk I / F 414 and the memory controller 408. The CPU 401 executes a game program loaded on the main memory 405. The portable game device 10 outputs the operation data of the operation switch 13 and the output value of the acceleration sensor to the game device 40 via the communication cable 70a. The operation data output from the portable game device 10 and the output value of the acceleration sensor are input to the CPU 401 via the controller I / F 409 and the memory controller 408. The CPU 401 executes predetermined game processing in accordance with operation data input from the portable game device 10 and an output value of the acceleration sensor.
[0097]
A graphics processing unit (GPU) 402 mainly performs image data generation processing in accordance with control from the CPU 401. The GPU 402 includes a geometry unit 402a and a rendering unit 402b, and is connected to a memory (color buffer 403 and Z buffer 404) dedicated to image processing. Note that an area for image processing may be secured in a part of the main memory 405 without providing a dedicated memory for image processing. The geometry unit 402a and the rendering unit 402b are circuits for processing 3D computer graphics. The geometry unit 402a is a circuit that performs processing for determining the position of an object in the virtual three-dimensional space (a position in the game space and three-dimensional coordinates). The rendering unit 402b is calculated by the geometry unit 402a. This is a circuit that performs processing for generating a two-dimensional image to be displayed on the television 80 based on the three-dimensional coordinates. The color buffer 403 stores the two-dimensional image generated by the rendering unit 402a, and the Z buffer 404 stores information in the depth direction in the three-dimensional computer graphics. The GPU 402 generates image data to be displayed on the television 80 with these configurations, and outputs the image data to the television 80 via the memory controller 408 and the video I / F 410 as appropriate.
[0098]
A digital signal processor (DSP) 406 mainly performs audio data generation processing in accordance with control from the CPU 401. The sub memory 407 is a working memory for the DSP 406. The audio data generated by the DSP 406 is output to the speaker 80 b of the television 80 via the memory controller 408 and the audio I / F 412. Note that the audio signal output from the game machine device 40 may be output to a speaker different from the television 80.
[0099]
FIG. 15 is a diagram showing data stored in the DVD-ROM 50. The DVD-ROM 50 includes a program storage area 50a that stores a game program, a player object image data (including polygon data and texture data) storage area 50b, a non-player object image data storage area 50c, and other data (terrain object images). An area 50d in which data and various data used for the game program are stored is stored. The program storage area 50a stores a program corresponding to a flowchart described later with reference to FIGS. Image data (including polygon data and texture data) indicating the player object is stored in the player object image data storage area 50b. In the non-player object image data storage area 50c, image data (including polygon data and texture data) indicating a non-player object is stored for each non-player object. The other data storage area 152f stores various other data (for example, terrain object data, audio data, etc.) used for the game program.
[0100]
FIG. 16 is a diagram illustrating data stored in the main memory 405. The main memory 405 stores temporary data generated in the game process. In the acceleration sensor output value storage area 405a, an output value from the acceleration sensor 154 transferred from the portable game apparatus 10 to the game apparatus 40 is stored. The player object position data storage area 405b stores position data (X, Y, Z) of the world coordinate system in the virtual game space of the player object. The non-player object position data storage area 405c stores the position data (X, Y, Z) of the non-player object in the world coordinate system. The viewpoint data storage area 405d stores viewpoint coordinates (Cx, Cy, Cz) used in the three-dimensional image processing. The light source data storage area 405e stores light source coordinates (Lx, Ly, Lz) used in three-dimensional image processing. The basic position data storage area 405f stores the same basic position data as in the first embodiment. The other game variable data storage area 405g stores other game variable data (for example, data such as player object vitality data and possessed items). Program data read from the DVD-ROM 50 is transferred and stored in the program storage area 405h.
[0101]
17 to 22 are diagrams for explaining the rotational movement of the viewpoint coordinates in accordance with the inclination of the portable game apparatus 10. FIG. 17 is a diagram showing a virtual game space in a certain range centered on the player object 103. The camera gazing point 107 is determined at the foot of the player object (the position of the camera gazing point is not limited to this example). The viewpoint basic coordinates 105 are based on the Z axis minus direction in the local coordinate system (a coordinate system having the front of the player object as the Z axis, the upper side as the Y axis, and the right side as the X axis) with respect to the gazing point 107 as a reference. Yes, it is determined at a position separated by a predetermined distance (D1) in a direction (direction of the axis 111 in FIG. 18) forming 45 ° (Y-axis plus direction) with the XZ plane.
[0102]
An axis 120 (indicated by a dotted line) is a Z axis (an axis connecting the viewpoint and the gazing point) of the viewpoint coordinate system. The axis 110 is an axis obtained by projecting the Z axis (axis 120) of the viewpoint coordinate system onto the XZ plane (horizontal plane) of the world coordinate system. The axis 108 is an axis on the XZ plane of the world coordinate system, and is an axis orthogonal to the axis 110 at the point of sight. The axis 109 is an axis orthogonal to the axis 108 and the axis 110.
[0103]
FIG. 18 is a diagram for explaining the position of the viewpoint coordinates when the portable game apparatus 10 is held at the basic position (the state shown in FIG. 18A. In this embodiment, the horizontal state is set to the basic position). FIG. In this case, the viewpoint coordinates 106 are determined at the same position as the viewpoint basic coordinates 105 (FIG. 18B). An image (player object and ground) as shown in FIG. 18C is displayed on the television 80 according to the viewpoint determined in this way.
[0104]
FIG. 19 is a diagram for explaining the rotational movement of the viewpoint coordinates when the portable game device 10 is tilted by α1 ° from the basic position in the plus direction in the Z-axis direction (state in FIG. 19A). In this case, the coordinate obtained by rotating the viewpoint basic coordinates 105 by α1 ° in the direction opposite to the direction of inclination about the axis 108 is determined as the viewpoint coordinates 106 (FIG. 19B). An image as shown in FIG. 19C is displayed on the television 80 according to the viewpoint determined in this way.
[0105]
When the portable game device 10 is tilted in the positive direction of the Z-axis direction, the virtual game space that exists in the portable game device 10 becomes the portable game device 10 by rotating the viewpoint coordinates in the reverse direction. Similarly, it is displayed as if it is tilted in the positive direction of the Z-axis direction. Referring to the example of FIG. 19, when the portable game device 10 is tilted forward from the horizontal state, an image as if the virtual game space is tilted forward and the player object or the ground is looked down from above is displayed. Is done. Note that it is possible to display the game space tilted by tilting the game space itself, but in this case, it is necessary to convert the game space data itself into tilted data. The burden of is very large. On the other hand, in the present invention, the inclination of the game space can be expressed only by rotating the viewpoint coordinates.
[0106]
FIG. 20 is a diagram for explaining the rotational movement of the viewpoint coordinates when the portable game apparatus 10 is tilted by α2 ° from the basic position in the minus direction in the Z-axis direction (state in FIG. 20A). In this case, the coordinate obtained by rotating the viewpoint basic coordinates 105 by α2 ° in the direction opposite to the direction of inclination around the axis 108 is determined as the viewpoint coordinates 106 (FIG. 20B). An image as shown in FIG. 20C is displayed on the television 80 according to the viewpoint determined in this way. By tilting the portable game device 10 from the horizontal state to the depth side, the virtual game space is tilted to the depth side, and an image is displayed as if the player object or the ground is viewed from below.
[0107]
FIG. 21 is a diagram for explaining the rotational movement of the viewpoint coordinates when the portable game apparatus 10 is tilted by β1 ° from the basic position in the plus direction in the X-axis direction (the state shown in FIG. 21A). In this case, a coordinate obtained by rotating the viewpoint basic coordinates 105 by β1 ° in the direction opposite to the direction of inclination around the axis 110 is determined as the viewpoint coordinates 106 (FIG. 21B). An image as shown in FIG. 21C is displayed on the television 80 according to the viewpoint determined in this way. By tilting the portable game device 10 from the horizontal state to the right side, the virtual game space is tilted to the right side, and an image is displayed as if the player object or the ground is viewed from the left side.
[0108]
FIG. 22 is a diagram for explaining the rotational movement of the viewpoint coordinates when the portable game apparatus 10 is tilted by β2 ° from the basic position in the minus direction in the X-axis direction (the state shown in FIG. 22A). In this case, the coordinate obtained by rotating the viewpoint basic coordinates 105 by β2 ° in the direction opposite to the direction of inclination around the axis 110 is determined as the viewpoint coordinates 106 (FIG. 22B). An image as shown in FIG. 22C is displayed on the television 80 according to the viewpoint determined in this way. By tilting the portable game device 10 to the left from the horizontal state, the virtual game space is tilted to the left, and an image is displayed as if the player object or the ground is viewed from the right.
[0109]
23 to 28 are diagrams for explaining the rotational movement of the light source coordinates according to the inclination of the portable game apparatus 10. FIG. 23 is a diagram showing a certain range of virtual game space with the player object 103 as the center. A player object 103 and a shadow 104 of the player object are shown. The axes 108 to 110 are the same as those in FIG. The light source basic coordinates 114 are a minus direction that forms 45 ° on the Z axis and the XZ plane of the local coordinate system of the player object with reference to the gazing point 107, and 45 ° (the Y axis plus direction) with the XZ plane. The position is determined by a predetermined distance (D2) in the direction (the direction of the axis 113 in FIG. 24).
[0110]
FIG. 24 is a diagram for explaining the position of the light source coordinates when the portable game apparatus 10 is held at the basic position (the state shown in FIG. 24A). In this case, the light source coordinates 115 are determined at the same position as the light source basic coordinates 114 (FIG. 24B). The shadow 80 is processed by the light source determined in this way, whereby an image (player object and shadow) as shown in FIG. At this time, the shadow of the player object extends obliquely upward to the right on the screen.
[0111]
FIG. 25 is a diagram for explaining the rotational movement of the light source coordinates when the portable game apparatus 10 is tilted by α1 ° from the basic position in the plus direction in the Z-axis direction (state in FIG. 25A). In this case, the light source 115 is determined by rotating the light source basic coordinates 114 by α1 ° in the direction opposite to the direction of inclination around the axis 108 (FIG. 25B). An image as shown in FIG. 25C is displayed on the television 80 according to the viewpoint determined in this way.
[0112]
By rotating the light source coordinates in this way, when the portable game device 10 is tilted in the plus direction of the Z-axis direction, the virtual game space existing in the portable game device 10 is also tilted in the same manner. Light from a light source whose incident direction changes according to the inclination of the game space can be expressed. Specifically, in the image of FIG. 25C, the position of the light source moves in the direction of the axis 109, so that the shadow length is shorter than the image at the basic position (FIG. 24C). Further, as the position of the light source moves in the direction of the axis 110, the direction in which the shadow extends is closer to the right.
[0113]
FIG. 26 is a diagram for explaining the rotational movement of the light source coordinates when the portable game device 10 is tilted by α2 ° from the basic position in the minus direction of the Z-axis direction (state shown in FIG. 26A). In this case, a coordinate obtained by rotating the light source basic coordinates 114 by α2 ° in the direction opposite to the direction of inclination around the axis 108 is determined as the light source coordinates 115 (FIG. 26B). An image as shown in FIG. 26C is displayed on the television 80 according to the viewpoint determined in this way. Specifically, in the image of FIG. 26C, the length of the shadow becomes longer than the image at the basic position (FIG. 24C) by moving the position of the light source in the minus direction of the axis 109. In addition, as the position of the light source moves in the negative direction of the axis 110, the direction in which the shadow extends is closer to the upper direction.
[0114]
FIG. 27 is a diagram for explaining the position of the light source coordinates when the portable game device 10 is tilted by β1 ° from the basic position in the plus direction in the X-axis direction (the state in FIG. 27A). In this case, the coordinates obtained by rotating the light source basic coordinates 114 by β1 ° about the axis 110 in the direction opposite to the inclination direction are determined as the light source coordinates 115 (FIG. 27B). Depending on the viewpoint determined in this way, an image as shown in FIG. Specifically, in the image of FIG. 27C, the length of the shadow becomes longer than that of the image at the basic position (FIG. 24C) because the position of the light source moves in the minus direction of the axis 109. Further, as the position of the light source moves in the minus direction of the axis 108, the direction in which the shadow extends is shifted to the right.
[0115]
FIG. 28 is a diagram for explaining the rotational movement of the light source coordinates when the portable game device 10 is tilted by β2 ° from the basic position in the minus direction in the X-axis direction (state shown in FIG. 28A). In this case, a coordinate obtained by rotating the light source basic coordinates 114 by β2 ° about the axis 110 in the direction opposite to the inclination direction is determined as the light source coordinates 115 (FIG. 28B). Depending on the viewpoint determined in this way, an image as shown in FIG. 28C is displayed on the television 80. Specifically, in the image of FIG. 28C, the length of the shadow becomes shorter than that of the image at the basic position (FIG. 24C) because the position of the light source moves in the positive direction of the axis 109. Further, as the position of the light source moves in the positive direction of the axis 108, the direction in which the shadow extends is shifted upward.
[0116]
FIG. 29 to FIG. 31 are flowcharts showing programs that are stored in the program storage area 50 a of the DVD-ROM 50 and executed by the CPU 401. The main flow in the present embodiment is the same as the main flow (FIG. 10) of the first embodiment described above, and a description thereof will be omitted.
[0117]
FIG. 29 is a diagram showing a flow of game processing. First, in S100, input detection processing of the operation switch 13 is performed. Note that the player operates the operation switch 13 for an instruction to move the player object. After S100, acceleration sensor input detection processing is performed in S101. Specifically, the X-axis direction output value and the Z-axis direction output value output from the acceleration sensor 154 and transmitted from the portable game apparatus 10 to the game apparatus 40 via the communication cable 70a are the acceleration sensor in FIG. It is stored in the output value storage area 405a.
[0118]
After S101, player object placement processing is performed in S102. Specifically, based on the operation switch operation information detected in the operation switch input detection process (S100), a process for moving the player object is performed, and a position in the game space after the player object is moved is determined. These are stored in the player object position data storage area 405b of FIG.
[0119]
After S102, non-player object placement processing is performed in S103. Specifically, the non-player object moving process is performed based on the non-player object moving program included in the game program, and the position in the game space after the non-player object is moved is determined. It is stored in the non-player object position data storage area 405c.
[0120]
After S103, viewpoint coordinate determination processing is performed in S104. This process will be described later with reference to FIG. After S104, a light source coordinate determination process is performed in S105. This process will be described later with reference to FIG.
[0121]
After S105, in S106, processing related to light expression is performed based on the light source determined in S105. Specifically, a process of generating a shadow that the player object or the like drops on the terrain or another object, or a process as if light hits a certain object and is reflected is performed. For these processes, various methods have been established as image processing techniques for three-dimensional graphics (for example, a shadow volume method or a shadow map method for a process for generating a shadow), and thus description thereof is omitted here.
[0122]
After S106, other game processing is performed in S107. Specifically, a battle process between the player object and the non-player object is performed.
[0123]
After S107, display processing is performed in S108. Specifically, based on the data in the player object position data storage area 405b and the non-player object position data storage area 405c of FIG. 16, the viewpoint coordinates determined in S104, the result processed in S106, and the like. Thus, the game image is written into the color buffer 403. This process is performed by the CPU 401 and the GPU 402 working together.
[0124]
FIG. 30 is a flowchart showing details of the viewpoint coordinate determination processing in S104 of FIG. 29 described above. First, in S1041, processing for determining the viewpoint basic coordinates C0 is performed. That is, a position away from the gazing point 107 by a predetermined distance (D1) in the direction of the axis 111 is set as a viewpoint basic coordinate C0.
[0125]
After S1041, in S1042, the X-axis direction basic position SX is subtracted from the X-axis direction output value OutX of the acceleration sensor, and the tilt angle in the X-axis direction of the portable game device 10 with respect to the basic position is calculated.
[0126]
After S1042, in S1043, based on the tilt angle in the X-axis direction calculated in S1042, the viewpoint basic coordinate C0 is rotationally moved about the axis 110 (the coordinate after the rotational movement is C1). ). Specifically, it is rotationally moved by the same angle as the tilt angle calculated in S1042 in the direction opposite to the tilt direction calculated in S1042.
[0127]
After S1043, in S1044, the Z-axis direction basic position SZ is subtracted from the Z-axis direction output value OutZ of the acceleration sensor to calculate the tilt angle of the portable game apparatus 10 in the Z-axis direction with respect to the basic position.
[0128]
After S1044, in S1045, based on the tilt angle in the Z-axis direction calculated in S1044, a process of rotating and moving C1 calculated in S1043 around the axis 108 is performed (the coordinates after the rotation are C2). And). Specifically, it is rotated and moved in the direction opposite to the tilt direction calculated in S1044 by the same angle as the tilt angle calculated in S1044.
[0129]
After S1045, in S1046, processing for determining C2 calculated in S1045 as the viewpoint coordinates is performed. Specifically, the process of storing the viewpoint coordinates in the viewpoint data storage area 405d of FIG. 16 described above is performed. After S1046, the viewpoint coordinate determination process ends.
[0130]
FIG. 31 is a flowchart showing details of the light source coordinate determination processing in S105 of FIG. 29 described above. First, in S1051, processing for determining the light source basic coordinates L0 is performed. That is, a position that is a predetermined distance (D2) away from the gazing point 107 in the direction of the axis 113 is set as a light source basic coordinate L0.
[0131]
After S1051, in S1052, the X-axis direction basic position SX is subtracted from the X-axis direction output value OutX of the acceleration sensor to calculate the tilt angle of the portable game apparatus 10 in the X-axis direction with respect to the basic position. Note that the process of S1052 is the same process as S1042 in the above-described viewpoint coordinate determination process, and therefore, the process may be shared.
[0132]
After S1052, in S1053, based on the inclination angle in the X-axis direction calculated in S1052, the light source basic coordinates L0 are rotated about the axis 110 (the coordinates after the rotation are L1). ). Specifically, it is rotationally moved by the same angle as the tilt angle calculated in S1052 in the direction opposite to the tilt direction calculated in S1052.
[0133]
After S1053, in S1054, the Z-axis direction basic position SZ is subtracted from the Z-axis direction output value OutZ of the acceleration sensor, and the tilt angle of the portable game apparatus 10 in the Z-axis direction with respect to the basic position is calculated. Note that the processing of S1054 is the same processing as S1044 in the above-described viewpoint coordinate determination processing, and thus the processing may be shared.
[0134]
After S1054, in S1055, based on the tilt angle in the Z-axis direction calculated in S1054, a process of rotating and moving L1 calculated in S1053 around the axis 108 is performed (the coordinates after the rotation are expressed as L2). And). Specifically, it is rotationally moved by the same angle as the tilt angle calculated in S1054 in the direction opposite to the tilt direction calculated in S1054.
[0135]
After S1055, in S1056, the process of determining L2 calculated in S1055 as the viewpoint coordinates is performed. Specifically, processing for storing light source coordinates in the light source data storage area 405e of FIG. 16 described above is performed. After S1046, the light source coordinate determination process ends.
[0136]
In the second embodiment described above, there are various methods for determining the axis (the “predetermined axis” in the invention described in claim 8 or claim 24) as the center of the viewpoint and the rotational movement of the light source as follows. Variations are possible.
(1) When the tilt sensor detects the tilt in the left-right direction of the housing, the Z axis of the local coordinate system of the player object is set as a predetermined axis, and the light source or the viewpoint is rotated about this axis. Further, when the tilt sensor detects the tilt in the front-rear direction of the housing, the tilt sensor is rotated about the X axis of the local coordinate system of the player object.
(2) In the above-described embodiment, the axis (axis 110) obtained by projecting the Z axis (axis 120) of the viewpoint coordinate system onto the XZ plane of the world coordinate system is set as the predetermined axis. The axis itself is a predetermined axis.
(3) In the above-described embodiment, the axis (axis 110) obtained by projecting the Z axis (axis 120) of the viewpoint coordinate system onto the XZ plane of the world coordinate system is set as the predetermined axis. The axis projected on the XZ plane of the local coordinate system of the object (for example, player object) is defined as a predetermined axis. In addition, an axis obtained by projecting the Z axis of the viewpoint coordinate system onto a terrain object (a ground object on which the player object is located) is set as a predetermined axis.
[0137]
FIG. 32 is a diagram showing a third embodiment of the present invention. In the third embodiment, the operating device operated by the player is not the game system 14 but the controller 90 as compared to the second embodiment described above. The controller 90 includes a housing 91 and operation switches 92a to 92d. Further, the housing includes an acceleration sensor 93, and when the player holds and tilts the controller 90, a value corresponding to the tilt is output to the game apparatus 40. Since the contents of the process of the third embodiment are the same as those of the second embodiment, the description thereof is omitted.
[Brief description of the drawings]
FIG. 1 is an external view showing a game system according to a first embodiment of the present invention.
FIG. 2 is a block diagram of the game system of the first embodiment.
FIG. 3 is a diagram defining an X axis, a Y axis, and a Z axis of the portable game apparatus 10 of the first embodiment.
FIG. 4 is a diagram illustrating data stored in a ROM 152 of the first embodiment.
FIG. 5 is a diagram showing data stored in the work RAM 24 of the first embodiment.
FIG. 6 is a diagram illustrating player object image data, player object shadow image data, and an image of a player object (with a shadow) according to the first embodiment.
FIG. 7 is a diagram of a player object (shaded) image displayed on the LCD 12 when the portable game apparatus 10 of the first embodiment is tilted in the positive direction of the X axis direction.
FIG. 8 is a diagram of a player object (with shadow) image displayed on the LCD 12 when the portable game apparatus 10 of the first embodiment is tilted in the positive direction of the Z-axis direction.
FIG. 9 is a diagram of a player object (with shadow) image displayed on the LCD 12 when the portable game apparatus 10 of the first embodiment is tilted in an oblique direction.
FIG. 10 is a diagram showing a main flow of the first embodiment.
FIG. 11 is a flowchart showing details of game processing of the first embodiment.
FIG. 12 is a flowchart showing details of a shadow arrangement process according to the first embodiment.
FIG. 13 is an external view of a game system 30 according to a second embodiment of the present invention.
FIG. 14 is a block diagram showing a hardware configuration of a game system 30 according to a second embodiment of the present invention.
FIG. 15 is a diagram showing data stored in a DVD-ROM 50 according to the second embodiment of the present invention.
FIG. 16 is a diagram showing data stored in a main memory 405 according to the second embodiment of the present invention.
FIG. 17 is a view showing a virtual game space in a certain range centered on a player object 103 according to the second embodiment of the present invention.
FIG. 18 is a diagram for explaining the position of viewpoint coordinates when the portable game device 10 of the second embodiment of the present invention is held at the basic position.
FIG. 19 is a view for explaining the rotational movement of the viewpoint coordinates when the portable game device 10 of the second embodiment of the present invention is tilted α1 ° from the basic position in the plus direction of the Z-axis direction.
FIG. 20 is a view for explaining the rotational movement of viewpoint coordinates when the portable game device 10 of the second embodiment of the present invention is tilted α2 ° from the basic position in the negative direction of the Z-axis direction.
FIG. 21 is a view for explaining the rotational movement of the viewpoint coordinates when the portable game device 10 of the second embodiment of the present invention is tilted by β1 ° from the basic position in the plus direction of the X axis direction.
FIG. 22 is a view for explaining the rotational movement of the viewpoint coordinates when the portable game device 10 of the second embodiment of the present invention is tilted by β2 ° from the basic position in the minus direction of the X-axis direction.
FIG. 23 is a diagram showing a virtual game space in a certain range centered on a player object 103 according to the second embodiment of the present invention.
FIG. 24 is a diagram for explaining the position of light source coordinates when the portable game device 10 of the second embodiment of the present invention is held at the basic position.
FIG. 25 is a diagram for explaining the rotational movement of the light source coordinates when the portable game apparatus 10 of the second embodiment of the present invention is tilted α1 ° from the basic position in the plus direction in the Z-axis direction.
FIG. 26 is a diagram for explaining the rotational movement of the light source coordinates when the portable game device 10 of the second embodiment of the present invention is tilted α2 ° from the basic position in the negative direction of the Z-axis direction.
FIG. 27 is a diagram for explaining the position of the light source coordinates when the portable game device 10 of the second embodiment of the present invention is tilted by β1 ° from the basic position in the plus direction in the X-axis direction.
FIG. 28 is a diagram for explaining rotational movement of light source coordinates when the portable game apparatus 10 of the second embodiment of the present invention is tilted by β2 ° from the basic position in the minus direction of the X-axis direction.
FIG. 29 is a diagram showing a flow of game processing according to the second embodiment of the present invention.
FIG. 30 is a flowchart showing details of viewpoint coordinate determination processing according to the second embodiment of the present invention.
FIG. 31 is a flowchart showing details of light source coordinate determination processing according to the second embodiment of the present invention;
FIG. 32 is a diagram showing a third embodiment of the present invention.
[Explanation of symbols]
10 ... portable game device
14 ... Game system
15 ... cartridge
154 ... Acceleration sensor
30 ... Game system
40. Game device
50 ... DVD-ROM
103 ... Player object
104 ... Shadow of the player object
105 ... Basic coordinates of viewpoint
106 ... viewpoint coordinates
114 ... Light source basic coordinates
115: Light source coordinates

Claims (13)

A game system for displaying on a display means a three-dimensional game space in which a plurality of objects exist,
A housing held by the player,
An inclination sensor that is provided in the housing and detects an inclination when rotating around a predetermined axis in the housing;
According to the output value of the tilt sensor, the basic coordinates of the light source in the game space are rotated and moved in the direction opposite to the tilt direction around the predetermined axis in the game space corresponding to the predetermined axis in the housing. source coordinate change means the coordinates of the light source the coordinates after the movement, and in accordance with the coordinates of the light source is changed by the light source coordinate change means, subjected to processing of generating a shadow of the image processing three-dimensional graphics A game system comprising shadow image processing means for generating a shadow of the object and displaying it on the display means. A game system for displaying on a display means a three-dimensional game space in which a plurality of objects exist,
A housing held by the player,
An inclination sensor provided in the housing for detecting the inclination of the housing;
Light source basic coordinate determining means for determining basic coordinates of a light source in the game space ;
In accordance with the output value of the tilt sensor, a predetermined axis is determined according to the tilt direction detected by the tilt sensor, and the basic coordinates of the light source determined by the light source basic coordinate determination means with the predetermined axis as the center rotate the movement in the opposite direction to the inclined-out direction, the light source coordinate variation means the coordinates after the rotation movement shall be the coordinates of the light source, and
A shadow image that generates a shadow of the object and displays it on the display means by performing a process of generating a shadow as an image process of three-dimensional graphics according to the coordinates of the light source changed by the light source coordinate changing means A game system comprising processing means. When the tilt sensor detects the horizontal tilt of the housing, the light source coordinate changing means is configured to project the Z axis of the viewpoint coordinate system onto the XZ plane of the world coordinate system and the Z axis of the viewpoint coordinate system to the player. The axis projected on the XZ plane of the local coordinate system of the object, the Z axis of the local coordinate system of the player object, the Z axis of the viewpoint coordinate system, or the axis of projecting the Z axis of the viewpoint coordinate system on the ground object The game system according to claim 2, wherein the game system is determined to be a predetermined axis. When the tilt sensor detects the tilt of the housing in the front-rear direction, the light source coordinate changing means is orthogonal to the axis projected on the XZ plane of the world coordinate system, and the XZ of the world coordinate system The game system according to claim 2, wherein an axis that exists on a plane and passes through a gazing point is determined as the predetermined axis.   The light source coordinate changing means rotates the basic coordinates of the light source in the reverse direction by the same angle as the inclination angle detected by the inclination sensor around the predetermined axis, and the coordinates after the rotation movement are set as the light source coordinates. The game system according to any one of claims 2 to 4.   The game system according to claim 2, wherein the light source basic coordinate determining unit determines the basic coordinates of the light source as a fixed direction and / or distance with respect to a predetermined object. Further comprising basic position determining means for determining a basic position of the housing, the basic position determining means holding an output value of the tilt sensor at the basic position;
The light source coordinate changing means sets the light source to the basic coordinates when the output value of the tilt sensor is equal to the output value held by the basic position determining means, and the output value of the tilt sensor is set to the basic position. The game system according to claim 1, wherein a displacement of the light source from the basic coordinates is determined according to a value corrected by the output value held by the determining means. A housing that is held by a player, and a tilt sensor that is provided in the housing and detects a tilt when the housing rotates about a predetermined axis, and a three-dimensional game space in which a plurality of objects exist is displayed on the display means A game program executed by a game system to be displayed,
In the computer of the game system,
According to the output value of the tilt sensor, the basic coordinates of the light source in the game space are rotated and moved in the direction opposite to the tilt direction around the predetermined axis in the game space corresponding to the predetermined axis in the housing. A light source coordinate changing step using the coordinates after movement as the coordinates of the light source , and a process of generating a shadow as image processing of three-dimensional graphics according to the light source coordinates changed by the light source coordinate changing means A game program for executing a shadow image processing step of generating a shadow of the object and displaying it on the display means. A game program that is executed in a game system that includes a housing held by a player, and a tilt sensor provided in the housing, and displays a three-dimensional game space in which a plurality of objects exist on a display unit,
In the computer of the game system,
A light source basic coordinate determining step for determining basic coordinates of a light source in the game space ;
In accordance with the output value of the tilt sensor, a predetermined axis is determined according to the tilt direction detected by the tilt sensor, and the basic coordinates of the light source determined by the light source basic coordinate determination step with the predetermined axis as the center rotate the movement in the direction opposite to the direction of-out inclined, the light source coordinate shift step coordinates after rotational movement shall be the coordinates of the light source, and
Shadow image processing for generating a shadow as image processing of three-dimensional graphics in accordance with the coordinates of the light source changed by the light source coordinate changing means, generating a shadow of the object, and displaying it on the display means A game program that causes a step to be executed. In the light source coordinate changing step, when the tilt sensor detects the horizontal tilt of the housing, the Z axis of the viewpoint coordinate system is projected on the XZ plane of the world coordinate system, and the Z axis of the viewpoint coordinate system is the player. The axis projected on the XZ plane of the local coordinate system of the object, the Z axis of the local coordinate system of the player object, the Z axis of the viewpoint coordinate system, or the axis of projecting the Z axis of the viewpoint coordinate system on the ground object The game program according to claim 9, wherein the game program is determined as a predetermined axis. The light source coordinate change step is present on the XZ plane of the world coordinate system orthogonal to the axis projected on the XZ plane of the world coordinate system when the tilt in the front-rear direction of the housing is detected. The game program according to claim 9, wherein an axis passing through the gazing point is determined as the predetermined axis.   The game program according to claim 9, wherein the light source basic coordinate determination step determines the basic coordinates of the light source in a fixed direction and / or distance with respect to a predetermined object. In the computer of the game system,
A basic position determining step for determining a basic position of the housing is further executed, and the basic position determining step holds an output value of the tilt sensor at the basic position;
The light source coordinate changing step sets the light source to the basic coordinates when the output value of the tilt sensor is equal to the output value held by the basic position determining means, and sets the output value of the tilt sensor to the basic position. The game program according to claim 8, wherein a displacement of the light source from the basic coordinates is determined according to a value corrected by the output value held by the determining means.

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