JP2009245386A - Program, storage medium, and computer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a program capable of enhancing visual effects, while expressing determination of the optimal arrangement position of an effect object in a pseudo manner, expressing the appearance that light of the sun, and the like, shines on the water surface, using a simple processing, within a game space, such as action game. <P>SOLUTION: In a virtual three-dimensional game space where a water surface object W is arranged, a right triangle ABC is created by a camera position A; a point opposite to the camera position without sandwiching the water surface object W; and a point C opposite to the point B sandwiching the water surface object W, internal ratio of a segment BC which uses intersection with the water surface object W as an internally dividing point is calculated, and a position for internally dividing a segment AC, using the same ratio as the internal ratio is determined as the arrangement position of the effect object H. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a program, a storage medium, and a computer device for executing a game such as an action game in which a character operated by a player defeats an enemy character.

  When drawing underwater conditions in a three-dimensional space with planar semi-transparent objects (water surface objects) that make up the sea, lakes, etc., light from the sun or the like is inserted into the water surface in order to create a realistic game expression. A water effect figure (effect object) that simulates the situation is also drawn. Conventionally, the position of the figure in the three-dimensional space has been determined by a simple process. For example, the position on the water surface object that is a predetermined distance in the direction parallel to the camera line of sight from the point directly above the camera position (or the position of the player character) on the water surface object is determined as the placement position of the effect object. The predetermined distance is a fixed value regardless of the depth of the camera position (or the position of the player character). This figure is formed of a plate polygon or the like (Patent Document 1).

Patent No. 4015644

  Normally, when the camera position is shallow, the amount of sun light to be inserted is large because it is close to the water surface, and the position of the effect object should be close. On the other hand, when the camera position is deep, it is far from the water surface, so the amount of sun light to be inserted is small, and the position of the effect object should be far. However, in the simple processing as described above, since the effect object is always at the same position from the camera or the like and does not change, the player feels uncomfortable and lacks reality. The sun or other light that enters the surface of the water is a natural phenomenon and has no regularity. On the other hand, the above-mentioned processing is too uniform and the visual effect on the player is lost. It was.

  On the other hand, since the effect object is not directly related to the progress of the game, the arrangement process of the effect object should not be a complicated process, and a visual effect of light should be produced with a simple process.

  The present invention determines a suitable arrangement position of an effect object that gives reality to the game space (such as sunlight that is inserted into the water surface) by simple processing, and stores the program. An object of the present invention is to provide a storage medium and a computer device that executes the program.

  According to the first aspect of the present invention, the computer is arranged in contact with one surface side of the planar object, the planar object generating means for generating a planar object in the virtual three-dimensional game space, and the visual effect An effect object generating means for generating an effect object for providing a player with an image, and an image creation for creating an image of the planar object and the effect object from a virtual camera position set on the one surface side of the planar object The image creating means includes means for moving the camera position, and the effect object generating means is configured to change the effect object according to a distance between the camera position and the planar object. The position of is determined.

  According to a second aspect of the present invention, in the first aspect of the present invention, the effect object generating means controls the effect object control to a point having a specific positional relationship with the camera position in the space on the other surface side of the planar object. Set as a point, the effect object is arranged at the intersection of the straight line connecting the camera position and the effect object control point and the planar object, and when the camera position is moved, the effect object control point is It is characterized by being moved so that a specific positional relationship is maintained.

  According to a third aspect of the present invention, in the second aspect, the effect object generating means includes a plane perpendicular to the planar object including the camera position A and a gazing point P that is a target point of the line of sight of the camera. And a predetermined position on the straight line v passing through the point B on the straight line h passing through the camera position A and extending on the other surface side through the point B. The point C is set, and this point C is set as the effect object control point.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the effect object generating means sets the perpendicular of the planar object passing through the gazing point P as the straight line v, and the intersection of the straight line v and the straight line h. The point B is a feature.

  According to a fifth aspect of the present invention, in the third and fourth aspects of the invention, the effect object generating means sets a straight line parallel to the planar object passing through the camera position A as the straight line h, and the straight line formed by the planar object. By applying the internal division ratio of the line segment BC, which is a partial section of v, to the line segment connecting the camera position A and the point C, the internal division point is obtained, thereby obtaining the camera position and the effect object control point. It is characterized in that an intersection point between the connecting straight line and the planar object is obtained.

  According to a sixth aspect of the present invention, in the first to fifth aspects of the present invention, the effect object generating means arranges the effect object at an intersection of the straight line connecting the camera position and the effect object control point and the planar object. Instead, it is characterized in that it is arranged at a small distance away from the intersection of the straight line connecting the camera position and the effect object control point and the planar object on the one surface side.

  The invention of claim 7 is the invention of claims 1 to 6, wherein the planar object generating means is a means for generating a translucent object representing a water surface as a planar object, and the effect object generating means is an effect. The object is a means for generating a translucent object that artificially represents a state in which light is inserted into the water surface.

  According to an eighth aspect of the present invention, in the first to seventh aspects of the present invention, the effect object generating means generates and / or generates the effect object according to a distance between the camera position and the planar object. It is characterized by controlling the appearance size of an object.

  The invention according to claim 9 is a computer-readable storage medium storing the program according to any one of claims 1 to 8.

  A tenth aspect of the present invention is a computer device that reads and executes the program according to any one of the first to eighth aspects.

  According to this invention, the optimal arrangement position of the effect object that gives the reality to the game space is determined by the distance between the camera position and the planar object, and the visual effect given to the player can be improved. For example, when drawing the state of the underwater game space, the arrangement position of the effect object representing the sun light or the like inserted into the water surface is determined by the distance between the camera position and the translucent object forming the water surface. Thereby, the position of the effect object representing the sun light or the like to be inserted changes according to the movement of the camera, and a real underwater image can be realized.

≪Description of game system≫
A game system 1 to which the present invention is applied will be described with reference to the drawings.
FIG. 1 is an external view for explaining the game system 1. Hereinafter, the game system 1 of the present invention will be described using a stationary game apparatus as an example.

  In FIG. 1, a game system 1 includes a stationary game device (hereinafter simply referred to as a game device) connected to a monitor device 2 such as a home television receiver having a speaker 2a and a display 2b via a connection cord. 3) and a controller 7 for giving operation information to the game apparatus 3. An optical disk 4 that is an example of a replaceable storage medium is set in the game apparatus 3 and a removable memory card 5 that stores game save data and the like in a non-volatile manner is mounted as necessary. The game apparatus 3 is provided with a power ON / OFF switch which is a main power source of the game, and an eject switch for attaching / detaching the optical disk 4.

  The controller 7 is a device that is operated by the player and transmits an operation signal indicating the content of the device to the game device 3. The game apparatus 3 performs control such as starting and ending the game in accordance with the operation signal transmitted from the controller 7 and advancing the game. Communication between the controller 7 and the game apparatus 3 is performed wirelessly. As the communication method, for example, the Bluetooth (registered trademark) method is used. As a communication unit for this communication, the controller 7 includes a communication unit 75 (see FIG. 4), and the game apparatus 3 includes a receiving unit 36a (see FIG. 2). One to four controllers 7 can be wirelessly connected to one game apparatus 3. That is, the game apparatus 3 has a function of identifying and receiving operation signals transmitted from up to four different controllers 7.

  Light emitting units 8L and 8R are attached to the left and right upper surfaces of the monitor device 2 to inform the controller 7 of the position of the monitor device 2. The light emitting units 8L and R each incorporate an infrared LED, and emit light with infrared rays while the game apparatus 3 is in operation.

  Next, the functional configuration of the game apparatus 3 will be described with reference to the block diagram of FIG. In FIG. 2, the game apparatus 3 includes, for example, a risk (RISC) CPU (Central Processing Unit) 30 that executes various programs. The CPU 30 executes a boot program stored in a boot ROM (not shown), initializes a memory such as the main memory 33, and the like, and then executes a game program stored in the optical disc 4 according to the game program. Game processing and the like. A GPU (Graphics Processing Unit) 32, a main memory 33, a DSP (Digital Signal Processor) 34, and an ARAM (Audio RAM) 35 are connected to the CPU 30 via a memory controller 31. The memory controller 31 is connected to a controller I / F (interface) 36, a video I / F 37, an external memory I / F 38, an audio I / F 39, and a disk I / F 41 via a predetermined bus. The receiving unit 36a, the monitor device 2, the external memory card 5, the speaker 2a, and the disk drive 40 are connected.

The GPU 32 performs image processing based on a command from the CPU 30, and is configured by a semiconductor chip that performs calculation processing necessary for displaying 3D graphics, for example. The GPU 32 generates an image of each frame (two-dimensional image by a known perspective projection method) in a three-dimensional virtual space (game space) using a memory dedicated to image processing (not shown) and a partial storage area of the main memory 33. Then, a game image generated by combining an image such as a cursor with this image is output to the monitor device 2 (display 2b) via the memory controller 31 and the video I / F 37.
The main memory 33 is a storage area used by the CPU 30 and appropriately stores a game program read from the optical disc 4 and various data.

  The DSP 34 processes sound data generated by the CPU 30 when the game program is executed, and is connected to an ARAM 35 for storing the sound data. The ARAM 35 is used when the DSP 34 performs a predetermined process (for example, storing a pre-read game program or sound data). The DSP 34 reads the sound data stored in the ARAM 35 and outputs the sound data to the speaker 2 a included in the monitor device 2 via the memory controller 31 and the audio I / F 39.

  The memory controller 31 controls the overall data transfer and is connected to the various I / Fs described above. The receiving unit 36a is connected to the memory controller 31 via the controller I / F 36. As described above, the reception unit 36 a receives transmission data from the controller 7 and outputs the transmission data to the CPU 30 via the controller I / F 36 and the memory controller 31. The monitor device 2 is connected to the video I / F 37. An external memory card 5 is connected to the external memory I / F 38, and access to a backup memory or the like provided in the external memory card 5 becomes possible.

The audio I / F 39 is connected to a speaker 2a built in the monitor device 2 so that sound data read out from the ARAM 35 by the DSP 34 or sound data directly output from the disk drive 40 can be output from the speaker 2a. A disk drive 40 is connected to the disk I / F 41. The disk drive 40 reads data stored on the optical disk 4 arranged at a predetermined reading position, and outputs the data to the bus of the game apparatus 3 and the audio I / F 39.
Next, the controller 7 will be described with reference to FIG.

  The controller 7 has a housing 71 formed by plastic molding, for example. The housing 71 has a substantially rectangular parallelepiped shape with the front-rear direction as a longitudinal direction, and is a size that can be gripped with one hand of an adult or a child as a whole.

  A cross key 72 c is provided on the center front side of the upper surface of the housing 71. The cross key 72c is a cross-shaped four-direction push switch, and operation portions corresponding to four directions (front and rear, left and right) indicated by arrows are arranged on the cross-shaped projecting piece at intervals of 90 °. When the player presses the operation unit in any direction of the cross key 72 c, an operation signal indicating the direction is transmitted from the controller 7 to the game apparatus 3. When the player operates the cross key 72c, for example, the moving direction of the character appearing in the game space can be instructed, or the moving direction of the cursor can be instructed.

  A large number of button switches are provided behind the cross key 72c on the top surface of the housing 71. When each button is turned on, a corresponding operation signal is transmitted from the controller 7 to the game apparatus 3. Among these button switches, the A button 72a is provided in the forefront (closer to the cross key 72c).

On the other hand, a recess is formed on the lower surface of the housing 71. The recess on the lower surface of the housing 71 is formed at a position where the player's index finger or middle finger is positioned when the player holds the housing 71. A button switch 72b is provided on the rear inclined surface of the recess. The button switch 72b is an operation unit that functions as a B button.
These A button 72a and B button 72b are set as button switches for the player to perform major operations on the game in the game program.

  The button switch 72h provided on the front side of the cross key 72a on the upper surface of the housing 71 is a power switch for remotely turning on / off the game apparatus 3 main body.

  In addition, an imaging element 743 (see FIG. 4) for capturing an image in front of the controller 7 is provided on the front surface of the housing 71. The imaging element 743 constitutes a part of the imaging information calculation unit 74 (see FIG. 4). When the controller 7 is supported toward the monitor device 2, the image sensor 743 images the light emitting units 8 </ b> L and R provided on the upper surface of the monitor device 2. The imaging information calculation unit 74 detects the orientation of the controller 7 based on the imaging positions of the light emitting units 8L and R in the imaging element 743.

Next, the internal configuration of the controller 7 will be described with reference to the block diagram of FIG.
In FIG. 4, the controller 7 includes a communication unit 75, an acceleration sensor 701, and a vibrator 704 in addition to the operation unit 72 and the imaging information calculation unit 74 described above.

  The imaging information calculation unit 74 includes an infrared filter 741, a lens 742, an imaging element 743, and an image processing circuit 744. The infrared filter 741 allows only infrared rays to pass from light incident from the front of the core unit 70. The lens 742 condenses the infrared light that has passed through the infrared filter 741 and outputs the condensed infrared light to the image sensor 743. The image sensor 743 is a solid-state image sensor such as a CMOS sensor, for example, and images the infrared rays collected by the lens 742. Therefore, the image sensor 743 captures only the infrared light that has passed through the infrared filter 741 and generates image data. Image data generated by the image sensor 743 is processed by an image processing circuit 744. Specifically, the image processing circuit 744 processes the image data obtained from the image sensor 743 to detect light from the high-luminance portion, that is, the light from the light emitting units 8L and R, and generates coordinate data indicating their position coordinates. Output to the communication unit 75.

  The acceleration sensor 701 is an acceleration sensor that detects acceleration on three axes of the controller 7 in the vertical direction, the horizontal direction, and the front-rear direction. The acceleration sensor 701 may be an acceleration sensor that detects acceleration on two axes in the vertical direction and the horizontal direction depending on the type of operation signal required. Data indicating the acceleration detected by the acceleration sensor 701 is output to the communication unit 75. The acceleration sensor 701 is typically a capacitance type acceleration sensor, but other types of acceleration sensors or gyro sensors may be used.

  The communication unit 75 includes a microcomputer (microcomputer) 751, a memory 752, a wireless module 753, and an antenna 754. The microcomputer 751 controls the wireless module 753 that wirelessly transmits transmission data while using the memory 752 as a storage area during processing.

  An operation signal (key data) from the operation unit 72, an acceleration signal (acceleration data) from the acceleration sensor 701, and coordinate data from the imaging information calculation unit 74 are output to the microcomputer 751. The microcomputer 751 temporarily stores the input data (key data, acceleration data, coordinate data) in the memory 752 as transmission data to be transmitted to the receiving unit 36a.

  Here, the wireless transmission from the communication unit 75 to the receiving unit 36a is performed every predetermined cycle, but since the game processing is generally performed in units of 1/60, a shorter cycle than that is performed. It is necessary to send in. Specifically, the processing unit of the game is 16.7 ms (1/60 seconds), and the transmission interval of the communication unit 75 configured with Bluetooth is 5 ms. When the transmission timing to the receiving unit 36a comes, the microcomputer 751 outputs the transmission data stored in the memory 752 as a series of operation information and outputs it to the wireless module 753. The wireless module 753 radiates operation information from the antenna 754 as a radio wave signal using a carrier wave of a predetermined frequency using, for example, Bluetooth (registered trademark) technology.

  The vibrator 704 may be a vibration motor or a solenoid, for example. Since the vibration is generated in the core unit 70 by the operation of the vibrator 704, the vibration is transmitted to the hand of the player holding it, and a so-called vibration-compatible game can be realized.

≪Description of game program≫
Next, a game program executed on this game apparatus will be described. This game program is a so-called hunting action game, and FIG. 5 is a diagram showing a game screen displaying one scene of the hunting action game. The hunting action game is a game in which a main character operated by a player uses various weapons and clears a mission by defeating an enemy character such as a monster existing in the game space. The main character is active in the game space by operating the controller 7 of the player.

  FIG. 5 is a diagram showing an example of a game image that displays a state in which the main character operated by the player is active in the water such as the sea or lake formed in the game space. In the game apparatus 1 that has read this game program, a camera is arranged behind the main character operated by the player, and the main character, the enemy character, and the game space image projected by the camera are drawn. The camera position is the position behind the main character, but the user can operate the controller 7 to change the camera position to any position on the circumference centered on the main character (camera operation). It is.

  The main character operated by the player searches for items in the water as well as on the ground and fights against enemy characters. When the main character enters the sea, lake, or the like formed in the game space, a virtual camera that projects the image of the game space is also placed in the water. An image taken underwater as shown in FIG. 5 is entirely bluish, has a water surface above it, and the water surface is rippled. There is sunlight in some of them. 5A, 5B, and 5C express how the main character gradually rises toward the water surface. In FIG. 5 (A), the main character exists in a dark part near the rocks on the seabed, but in FIG. 5 (B), the main character is separated from the rocks on the seabed and slightly approaches the water surface into which the sunlight enters. In C), the main character rises further toward the water surface and exists in a shallow and bright part of the water.

  The sea or lake in the game space means a game space that is divided by a translucent planar object (water surface object) that forms the water surface and an object such as the sea floor. Unlike the real world, an object that represents water or the like is inside. It doesn't exist. Therefore, in order to create a realistic underwater game space video as shown in FIG. 5, the game apparatus 1 loaded with the game program differs from the case of creating an aerial game space video as follows. Perform proper processing. Apply a transparent blue filter to the entire screen including the character. With this blue filter, the character also appears bluish, and the deeper the portion looks bluish. In addition, fog is applied to the entire screen. As a result, the screen is lightly blurred and the field of view is limited, and a realistic underwater image can be realized. A wave texture is pasted on the water surface object. Then, in order to draw a realistic underwater situation, a water surface effect figure (effect object H) that simulates the appearance of light such as the sun entering the water surface overlaps with a partial area of the water surface object. To place.

  Moreover, in the game apparatus 1 which read the game program of this embodiment, the position of the sunlight to insert changes as the camera moves as shown in FIGS. 5A to 5C, and a realistic underwater image is realized. . The effect described above can be obtained by moving the position of the effect object H in accordance with the change in the camera position or the line of sight of the camera.

  A game system as shown in FIG. 6 can be functionally realized by causing the game device described above to read a game program for executing such a game. This game system includes an operation detection unit 50, a game progress control unit 51, and a drawing processing unit 55. The game progress control unit 51 includes a main character control unit 52, an enemy character control unit 53, and a game space control unit 54.

  The operation detection unit 50 includes a data processing unit such as the CPU 30 and the GPU 32 and the controller 7, detects various operations of the player, and transmits them to the game progress control unit 51. The game progress control unit 51 includes a data processing unit such as the CPU 30 and the GPU 32, generates a virtual game space such as water, land, and sky, and a character, and also performs the above-described operation according to the player's operation and the passage of time. The game is progressed by performing processing such as changing the game space or activating the character.

  The game progress control unit 51 is a main character control unit 52 that controls the activity of the main character, an enemy character control unit 53 that controls the activity of an enemy character that fights the main character, and a game that controls the environment such as generation of game space and weather. A space control unit 54 is provided.

  The main character control unit 52 generates a main character based on operation information input from the operation detection unit 50 and controls its activity. The enemy character control unit 53 generates an enemy character such as a monster that inhabits the game space and performs an activity (battle) corresponding to the activity of the main character. The game space control unit 54 generates a game space such as the ground or underwater, and controls the environment such as weather in the game space. For example, in the case where the main character is a stage that is active in a game space such as the sea or lake, the game space control unit 54 arranges a planar semi-transparent object (water surface object) so that light such as the sun is inserted into the water surface. A pseudo-transparent object (effect object H) is also arranged at the same time to generate and control an underwater game space. The drawing processing unit 56 generates a game image in which the game space and characters generated by the game progress control unit 51 are projected on a two-dimensional screen, and outputs the game image to the monitor.

  FIG. 7A is a diagram illustrating a state in which the effect object H is viewed from the side. The effect object H is a three-dimensional translucent object, and includes a plate polygon Ha and a plurality of strip-shaped polygons Hb extending from the plate polygon Ha.

  FIG. 7B is a diagram illustrating a state in which the effect object H is viewed from the plane. An elliptical texture T is mapped on a plate polygon Ha which is a planar polygon. The texture T is image data representing refraction on the water surface of light that is inserted from the air into the water. Further, a transparent color is set in an area where the texture T of the plate polygon Ha is not mapped. Polygon Hb is a strip-shaped planar polygon, and represents a band of light that is straightly inserted into water after texture mapping. The polygon Hb is randomly generated at an arbitrary position within a range S set inside the texture T. The generated polygon Hb disappears after a certain time (for example, 32 frames). Generation and disappearance of the polygon Hb are controlled by the game space control unit 54. The polygon Hb is rendered by a general billboard process in the drawing process. The billboard process is a process of pasting a 2D image on a polygon as a texture and compositing it on a 3D scene. Further, in a general billboard process, a process is performed in which a board polygon to which a texture is attached is directly opposed to the line-of-sight direction from the camera position. In this embodiment, only the Y axis of the polygon Hb (longitudinal direction of the polygon Hb) is rotated so as to face the above. As a result, there is no inconvenience that the effect object H cannot be seen depending on the camera position when an image including the effect object H having no thickness is generated.

≪Effect object placement process≫
Next, the arrangement process of the effect object H will be described. FIG. 8 is a diagram illustrating the arrangement position of the effect object H. In FIG. 10, FIG. 10, and FIG. 11, the straight line going upward is defined as the Y axis, the straight line directed toward the right is defined as the X axis, and the straight line directed toward the back of the screen is defined as the Z axis. In a virtual three-dimensional game space in which a planar translucent object (water surface object W) is arranged, a camera position (first vertex A) and a point (second vertex B) that faces the camera position without sandwiching the water surface object W ) And a point (third vertex C) facing each other with the water surface object W sandwiched between the second vertex, an effect object H that artificially represents a state in which light such as the sun is inserted into the water surface object W Determine the placement position.

  FIG. 8A is a diagram illustrating an arrangement position of the effect object H when the line of sight of the camera is in the horizontal direction (X and Z axis directions). FIG. 8B is a diagram illustrating an arrangement position of the effect object H when the camera position is lower than that in FIG. FIG. 8C is a diagram illustrating an arrangement position of the effect object H when the camera position is the same as that in FIG. 8A, but the line of sight of the camera is obliquely upward.

  The position of the first vertex A is determined as the camera position. The position of the second vertex B is a position where the line segment connected to the first vertex A is parallel to the surface direction of the water surface object W, and has the same value as the X and Z coordinates of the camera's point of sight and the Y coordinate of the camera position. Determine the position. The camera gazing point means a target point of the line of sight taken by the camera. The position of the third vertex C is determined as a position at a distance D from the second vertex B on a straight line extending from the second vertex B in the Y-axis direction. The distance D may be a fixed value set in advance, or may be changed according to the depth of the camera position. These three vertices A, B, and C form a right triangle of ∠ABC = 90 ° in which the line segment AB is parallel to the surface of the water surface object W.

  The arrangement position of the effect object H is calculated after calculating the internal division ratio (m: n, o: p, s: t) of the line segment BC with the intersection with the water surface object W as the internal division point. Is determined to be a position that internally divides the line segment AC at the same ratio. That is, the arrangement position of the effect object H is an intersection of the line segment AC and the water surface object W. As described above, the intersection of the water surface object W and the line segment AC is obtained by applying the internal ratio of the vertical line BC by the water surface object W to the line segment AC. Since the internal ratio of the perpendicular line BC can be easily calculated by using the axis coordinates, it is easier to obtain using the calculated internal ratio rather than directly obtaining the intersection of the water surface object W and the line segment AC. is there.

  Thus, when the camera position is shallow from the water surface, the position of the effect object is close, and when the camera position is deep from the water surface, the position of the effect object is far. Further, as shown in FIGS. 8A and 8C, even when only the line of sight is different without changing the camera position, the position of the effect object changes. In this way, the arrangement position of the effect object can be changed in accordance with the change in the camera position depth and line of sight. Therefore, a realistic underwater video can be expressed, and the visual effect given to the player can be improved.

  FIG. 9 is a flowchart of an effect object H placement process executed by the game space control unit 54. The camera position is determined based on the camera operation and the presence position of the main character, and the placement processing of the effect object H is executed according to the camera position. First, the position information of the water surface object W and the position information of the camera are acquired (S10). And it is judged whether a camera exists in water (S11). Whether or not the camera is present in the water is determined by determining whether or not the camera is present below the water surface object W from the position information of the camera. If the camera does not exist in the water (NO in S11), there is no need to arrange the effect object H, and the subsequent arrangement process is not performed.

  When the camera is present in the water (YES in S11), various information such as the coordinates of the camera's point of interest and data on the distance D is acquired (S12). Then, the position of the vertex B that is the same value as the X and Z coordinates of the acquired camera gazing point and the Y coordinate of the camera position is determined (S13). Further, on the straight line extending from the vertex B determined in S13 in the Y-axis direction, the position at the distance D acquired from the vertex B in S12 is calculated, and the position of the vertex C is determined (S14).

  As a result, a right triangle of ∠ABC = 90 ° in which the line segment AB is parallel to the surface of the water surface object W is formed based on the vertices A (camera positions), B, and C. Then, the internal ratio of the line segment BC with the intersection with the water surface object W as the internal dividing point is obtained, the position at which the line segment AC is internally divided at the same ratio as this internal ratio is calculated, and the line segment AC and the water surface object are calculated. The intersection with W is determined as the arrangement position of the effect object H (S15). The above arrangement process of the effect object H is performed every frame. As a result, the effect object H that simulates a state in which light such as the sun is inserted into the water surface can be arranged at an optimal position for each frame, and the visual effect of the underwater game space can be improved.

  In the present embodiment, the gazing point of the camera is used for the vertex B, but the vertex B may be an arbitrarily set point such that the line segment AB is parallel to the surface of the water surface object W. For example, a position that is a fixed distance away from the camera position on the line of sight in the X and Z axis directions may be the vertex B.

  In this embodiment, the vertex C is determined so as to be positioned on a straight line extending from the vertex B in the Y-axis direction. However, the vertex B and C are not necessarily a straight line extending in the Y-axis direction. Any straight line extending in a direction facing each other with the object W interposed therebetween may be used. In other words, in the present embodiment, the angle of ∠ABC is fixed at 90 °, but the angle of ∠ABC may not be 90 °. For example, as shown in FIG. 10, the arrangement position of the effect object H may be determined based on vertices A, B, and C at which ∠ABC becomes an acute angle. Furthermore, in FIG. 10, vertices A, B, and C are on the same X and Y plane sharing the Z coordinate, but vertex C does not have to be on the same X and Y plane as vertices A and B. The Z coordinate of the vertex C may be different from the Z coordinates of the vertices A and B.

  Further, the line segment AB may not be parallel to the surface of the water surface object W. For example, the intersection point between the line segment AC and the water surface object W may be obtained with the gazing point as the vertex B and the position extending from the gazing point by a predetermined distance in the Y-axis direction as the vertex C. When the line segment AB is not parallel to the surface of the water surface object W, the internal ratio of the line segment BC with the intersection with the water surface object W as the internal dividing point is different from the internal ratio of the line segment AC. What is necessary is just to obtain | require the intersection of the object W and line segment AC.

  The distance D necessary for determining the position of the vertex C can be arbitrarily set. For example, the value of D in FIG. 8A may be set to a value that satisfies m = n. However, it is desirable to set a value such that the vertex C is always positioned above the water surface object W in consideration of the depth in water (the depth to which the camera can move). The value of the distance D may be changed instead of being constant. For example, the value of D may be set to an arbitrary fixed value, and the fixed value may be set so as to be corrected above the water surface object W only when it does not reach the water surface.

  A plurality of distance D values may be stored, and an appropriate value may be used according to the situation. For example, an optimum value may be selected from a plurality of values according to the depth of water in which the camera is located and set as the distance D.

  Furthermore, in the present embodiment, the water surface object W is parallel to the horizontal direction (X and Z axis directions), but is not limited to the horizontal direction and may be an inclined direction. Further, the present invention can be applied not only to the water surface object W constituting the sea, the lake, etc., but also to a semi-transparent object such as a semi-transparent ground or glass plate as shown in FIG. 11 or an opaque plate object. It is.

  For example, if you place a grasshopper object (effect object) that represents a group of grassroots on a field (opaque ground plate object), it will be a processing load if you try to place the grassroot object correctly in the entire area of the ground plate object However, by applying the present invention to determine the arrangement position of the group Susuki object and arranging the center of the circle of the group Susuki object having a radius of 5 m so as to overlap the arrangement position, in the area of the plate object on the ground The area drawn through the camera can be at least puffy. In addition, the above effects can be obtained with a simple process that does not impose a processing load. Alternatively, a dragonfly or a school of fish may be used as the effect object. Therefore, the effect object is not limited to the translucent object of the present embodiment, and may be an opaque object as described above.

  Note that a process of correcting the arrangement position of the effect object H determined in the arrangement process may be further performed. The other processes are the same as those in FIG. 9 of the present embodiment. In the correction process, for example, a correction value is added to the Y-axis coordinate value of the determined arrangement position of the effect object H, and the effect object H is changed downward (underwater side) by a correction value (for example, 5 cm) from the water surface object W. It is processing to do. Alternatively, the internal division ratio of the perpendiculars B and C may be calculated using the position obtained by subtracting the correction value from the Y-axis coordinates of the water surface object W as an internal division point, and the arrangement position may be determined from the internal division ratio. .

  If the water surface object W and the effect object H overlap with each other, when drawing is performed by the Z sort method or the like, the drawing order may be different from the intended order depending on the camera position (reverse to the front). By performing the above correction process and shifting the positions of both objects W and H, it is possible to reduce the occurrence of drawing order errors.

  Also, as shown in FIG. 12, in the effect object H placement processing, according to the depth from the water surface object W, (1) whether to place the effect object H or (2) to place the effect object H Alternatively, a process of determining whether to change the shape of the effect object H (S24 to S28) may be added. Although the appearance of light such as the sun inserted into the water surface differs depending on the depth of the camera position from the water surface, it can be expressed separately. Other processes (S21 to S23, S29 to S31) are the same as those in FIG. 9 (S10 to S15) of the present embodiment. The depth from the water surface object W is the distance between the water surface object W and the vertex B (= vertex A).

  After performing the processes of S21 to S23 and acquiring various kinds of information such as the coordinates of the camera gazing point, the coordinates of the camera position, and the data of the distance D, the water surface object W and the The distance from the vertex B is calculated, and the depth from the water surface object W is acquired (S24). And it is judged whether the depth from the water surface object W acquired by S24 is more than a 1st predetermined value (S25). When the depth from the water surface object W is less than the first predetermined value (NO in S25), the effect object H is not arranged and the subsequent arrangement processing is not performed. This is because when the depth is less than the first predetermined value, that is, when the camera is in shallow water, it is too close to the water surface, and therefore it is unnatural to express light such as the sun inserted into the water surface.

  When the depth from the water surface object W is equal to or greater than the first predetermined value (YES in S25), the effect object H is arranged because the camera is present in deep water above a certain level, but the surface of the water is determined to determine the shape of the effect object H. It is determined whether the depth from the object W is equal to or greater than a second predetermined value (S26). When the depth from the water surface object W is not less than the first predetermined value and less than the second predetermined value (NO in S26), the band-shaped polygon Hb constituting the effect object H is drawn on a standard scale (S27).

  When the depth from the water surface object W is equal to or greater than the second predetermined value (YES in S26), the band-shaped polygon Hb constituting the effect object H is drawn with a scale reduced from the standard (S28). When the depth is greater than or equal to the second predetermined value, that is, when the camera is in a considerably deep water, the amount of light such as the sun that is inserted into the water surface is small, and thus it is more realistic to reduce the band-shaped polygon Hb. Because. Specifically, this is realized by changing the setting of the scale information regarding the belt-shaped polygon Hb. Thereafter, the processing of S29 to S31 is performed, and the arrangement position of the effect object H is determined.

  Note that when the effect object is a grouped Susuki object exemplified, when the camera position is in the sky far from the ground plate object, the scale of the grouped Susuki object (when the camera position is in a low sky near the ground plate object) (Appearance size) may be enlarged. When the camera position is in the sky, the area on which the ground plate object is drawn increases. However, it is possible to prevent the area of the ground alone without a puddle from being drawn due to the increase in the appearance size of the group Susuki object.

  In this embodiment, a home video game machine is exemplified as the game device, but the present invention is not limited to a home video game machine, and other types of games such as a portable game machine and an arcade game machine. It is possible to apply to a device that displays 3D video other than a game machine or a game machine, such as a personal computer loaded with a game program.

External view for explaining a game system to which the present invention is applied Functional block diagram of the game apparatus shown in FIG. The perspective view which shows the external appearance structure of the controller shown in FIG. Block diagram showing the configuration of the controller The figure which shows the game screen of the action game program which is embodiment of this invention The figure which shows the structure of the game system comprised by the same game program and the said game device. The figure which shows the structure of the effect object H The figure explaining the arrangement position of the effect object H A flowchart showing the operation of the game system The figure explaining the arrangement position of the effect object H The figure explaining the arrangement position of the effect object H A flowchart showing the operation of the game system

Claims (10)

Computer
A planar object generating means for generating a planar object in a virtual three-dimensional game space;
An effect object generating means for generating an effect object that is arranged in contact with one surface side of the planar object and gives a visual effect to the player;
Image creating means for creating an image of the planar object and the effect object from a virtual camera position set on the one surface side of the planar object;
A program that functions as
The image creating means includes means for moving the camera position,
The effect object generating means determines a position of the effect object according to a distance between the camera position and the planar object. The effect object generating means includes
In the space on the other surface side of the planar object, a point having a specific positional relationship with the camera position is set as an effect object control point,
The effect object is arranged at the intersection of the straight line connecting the camera position and the effect object control point and the planar object,
The program according to claim 1, further comprising means for moving the effect object control point so that the specific positional relationship is maintained when the camera position is moved.   The effect object generation means assumes a plane that includes the camera position A and the gazing point P that is a target point of the camera's line of sight and is perpendicular to the planar object, and passes through the camera position A on this plane. A point B at a predetermined position on the one surface side on the straight line h and a point C at a predetermined position on the straight line v passing through the point B and extending to the other surface side are set, and this point C is set as the effect object. The program according to claim 2, which is a control point.   The program according to claim 3, wherein the effect object generating unit sets a perpendicular of the planar object passing through the gazing point P as the straight line v and an intersection of the straight line v and the straight line h as the point B.   The effect object generating means sets a straight line parallel to the planar object passing through the camera position A as the straight line h, and an internal ratio of a line segment BC that is a partial section of the straight line v by the planar object, 4. An intersection between the straight line connecting the camera position and the effect object control point and the planar object is obtained by applying an internal dividing point by applying to a line connecting the camera position A and the point C. The program according to claim 4.   The effect object generating means replaces the effect object with the camera position and the effect object control point instead of arranging the effect object at the intersection of the straight line connecting the camera position and the effect object control point and the planar object. The program according to any one of claims 1 to 5, wherein the program is arranged at a minute distance away from an intersection of a straight line to be connected and the planar object. The planar object generating means is a means for generating an object representing the water surface as a translucent planar object,
The program according to any one of claims 1 to 6, wherein the effect object generating means is a means for generating a semi-transparent object as an effect object that artificially represents a state in which light is inserted into the water surface.   The effect object generation means controls presence / absence of generation of the effect object and / or appearance size of the effect object according to a distance between the camera position and the planar object. The listed program.   A computer-readable storage medium storing the game program according to any one of claims 1 to 8.   A computer device that reads and executes the game program according to claim 1.