JP2005279133A - Game device and game program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to generate various kinds of game images by a simple method using transparency. <P>SOLUTION: The game device has objects constituted of a polygon arranged in at least one game space. At least one of the objects arranged in the game space are selected as a target object 81. A reference point is set within the game space. The game device specifies the polygon or the apex of the polygon present within a reference area 83 where the reference point is made to be a reference about the polygon constituting the target object. Further, in setting a transparency on the polygon or apex of the polygon of the target object, different transparencies are set according to whether or not it is specified by a polygon specifying means. The target object is illustrated based on the set transparency, the image of the game space is displayed on a display. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a game device and a game program, and more particularly to a game device and a game program that display an image of a three-dimensional game space using transparency.

2. Description of the Related Art Conventionally, game devices that generate and display a game image in which a virtual three-dimensional game space is viewed from a predetermined viewpoint are known. For example, Japanese Patent Laid-Open No. 2001-167291 (Patent Document 1) presents an image generation system that variably controls the transparency of a second object that has substantially the same shape as the first object. In this image generation system, for example, a texture of a car body is mapped to a first object, and a texture for expressing dirt on the car body is mapped to a second object. Then, by variably controlling the transparency of the second object, the state in which the car body is soiled is expressed realistically.
JP 2001-167291 A

  The above image generation system is a technique for changing the transparency in object units (or part object units). Therefore, two objects, the first object and the second object, must be created for each unit whose transparency should be changed. For example, when expressing a state in which a circular portion of a part of a car body is soiled, in the above image generation system, the object of the circular portion must be set as an object different from other portions. That is, in the image generation system described above, if control for changing the transparency is to be performed in finer units, more objects must be prepared. Furthermore, if the size of the circular portion is to be changed, a plurality of types of objects must be prepared according to the size. As described above, in the conventional image generation system, it is necessary to prepare a large number of objects according to the position and size of the area to be controlled to change the transparency. Therefore, using a large number of objects increases the amount of data required for the objects and increases the burden of the drawing process.

  Therefore, an object of the present invention is to provide a game apparatus and a game program that can generate various game images by a simple method using transparency.

The present invention employs the following configuration in order to solve the above problems. Note that the reference numerals in parentheses and supplementary explanations in this column show the correspondence with the embodiments described later in order to help understanding of the present invention, and do not limit the present invention.
A first aspect of the present invention is a game apparatus (3) that displays an image of a three-dimensional game space on a display apparatus (television receiver 2). The game apparatus includes object placement means (S31 (abbreviation of step 11; the same applies hereinafter)), object selection means (S14), reference position setting means (S10), Specific means (S15), transparency setting means (S16 and S17), and display control means (S19) are provided. The object arranging means arranges at least one object (ground object 80, mycelium object 81, and spore object 82) constituted by polygons in the game space. The object selection means selects at least one of the objects arranged in the game space as a target object (mycelium object 81). The reference position setting means sets a reference position in the game space. The specifying unit specifies a polygon or a vertex of the polygon existing in the reference area with the reference position as a reference for the polygon constituting the target object. The transparency setting means sets different transparency depending on whether or not it is specified by the specifying means when setting the transparency for the polygon of the target object or the vertex of the polygon. The display control means draws the target object based on the transparency set by the transparency setting means, and displays an image of the game space on the display device.

  In the second invention, the object placement means may place the reference object (spore object 82) in the game space. At this time, the reference position setting means sets the position of the reference object in the game space as the reference position.

  In the third invention, the transparency setting means may set the transparency so that the polygon or the vertex of the polygon not specified by the specifying means is more transparent than the polygon or the vertex of the polygon specified by the specifying means. Good.

  In the fourth invention, the game device may further include area changing means (S12) for changing the range of the reference area according to a predetermined condition.

In the fifth invention, the transparency setting means determines whether the target means (α = 0 or α = 255) indicating the transparency value to be taken by the polygon or the vertex of the polygon is specified by the specifying means. Depending on the setting, the transparency value of the polygon or the vertex of the polygon may be increased or decreased by a predetermined amount from the current transparency at predetermined time intervals until the first target value is reached. Good.
Note that “decreasing transparency” means changing the value of transparency so that the polygon is displayed more opaque, and in the embodiment, increasing the value of α. Also, “increasing transparency” means changing the value of transparency so that the polygon is displayed more transparently. In the embodiment, it means decreasing the value of α.

  In the sixth invention, the predetermined condition may be a condition relating to an action of a game object (player object) appearing in the game space.

  The above-described invention may be provided as a game program that causes a game device to realize the above-described function by being executed in the computer of the game device.

  According to the first aspect, by setting the reference region that affects the transparency of the polygon of the target object, the target object can be displayed in various forms without changing the target object itself. Therefore, according to the present invention, since it is not necessary to prepare a plurality of types of objects, the data amount of the objects can be reduced, and the game image generation process can be simplified. That is, various variations of game images can be generated by a simple method using transparency.

  According to the second invention, it is possible to express how the reference object affects the target object by a simple method.

  According to the third aspect of the invention, it is possible to perform a display so that the inside of the reference region can be seen more clearly than the outside. For example, it is possible to display only the part included in the reference area of the target object and not display the other part.

  According to the fourth aspect, it is possible to express a state in which the shape and size of the displayed target object change with time.

  According to the fifth aspect, when the size of the reference area changes (including the case where the reference area disappears or occurs) or when the reference area moves, the reference object is not included in the reference area. The part is displayed so as to become gradually transparent. Further, the portion of the target object that is included in the reference area is displayed so as to gradually rise. Therefore, it is possible to realistically express how the target object gradually changes.

  According to the sixth aspect, the display form (display size, transparency, etc.) of the target object can be changed in relation to the action of another game object.

  Hereinafter, a game apparatus and a game program according to an embodiment of the present invention, and a game system including the game apparatus will be described. FIG. 1 is an external view of the game system 1. In the present embodiment, a stationary game device will be described as an example of the game device according to the present invention, but the game system is not limited to this, and for example, a portable game device, an arcade game device, a portable game device, and the like. The present invention can be applied to a device equipped with a computer that executes a game program, such as a terminal, a mobile phone, or a personal computer.

  In FIG. 1, a game system 1 includes a stationary game device (hereinafter simply referred to as a game device) 3 and a television receiver (example of a display device connected to the game device 3 via a connection cord). 2) (hereinafter referred to as TV). A controller 6 having a plurality of operation switches that can be operated by a player is connected to the game apparatus 3. The game apparatus 3 is detachably mounted with an optical disk 4 as an example of an information storage medium storing the game program according to the present invention. Furthermore, a cartridge 5 equipped with a flash memory or the like for storing game save data or the like is detachably attached to the game apparatus 3 as necessary. The game apparatus 3 displays a game image obtained by executing a game program stored on the optical disc 4 on the television 2. Furthermore, the game apparatus 3 uses the save data stored in the cartridge 5 to execute a continuation of a game executed in the past or reproduce a game state executed in the past, and transfer a game image to the television 2. It can also be displayed. The player of the game apparatus 3 can enjoy the game by operating the controller 6 while viewing the game image displayed on the television 2.

  The controller 6 is detachably connected to the game apparatus 3 via the connection cord as described above. The controller 6 is an operation means for mainly operating a player object (an object (character) that is an operation target of the player) appearing in the game space displayed on the television 2, and includes an operation button, It has input units such as keys and sticks. Specifically, the controller 6 is formed with a grip portion that is gripped by the player. The controller 6 includes a main stick 6a and a cross key 6b that can be operated with the thumb of the left hand of the player, a C stick 6c and an A button 6d that can be operated with the thumb of the right hand, and the like. In addition to the above buttons, the controller 6 can be operated with the B button, the X button, the Y button, the start-pause button, the R button operable with the index finger of the player's right hand, the index finger of the player's left hand, and the like. Includes L button. In addition, the game system 1 allows a plurality of players to play a game simultaneously by connecting a plurality of controllers 6 to the game apparatus 3.

  Next, the configuration of the game apparatus 3 according to the present invention will be described with reference to FIG. FIG. 2 is a functional block diagram of the game system 1. In FIG. 2, the game apparatus 3 includes a CPU (Central Processing Unit) 31 that executes various programs. The CPU 31 executes a startup program stored in a boot ROM (not shown), initializes a memory such as the work memory 32, and the like, and then once loads a game program stored in the optical disk 4 into the work memory 32. The game program is executed, and a game process corresponding to the game program is performed. The CPU 31 includes a work memory 32, a video RAM (VRAM) 33, an external memory interface (I / F) 34, a controller interface (I / F) 35, a GPU (Graphics Processing Unit) 36, and an audio interface (I / F) 37. , And an optical disk drive 38 are connected via a bus.

  The work memory 32 is a storage area used by the CPU 31 and appropriately stores a game program and the like necessary for the processing of the CPU 31. For example, the work memory 32 stores a game program read from the optical disc 4 by the CPU 31 and various data. The game program and various data stored in the work memory 32 are executed by the CPU 31. The VRAM 33 stores game image data for displaying a game image on the television 2. The external memory I / F 34 connects the game apparatus 3 and the cartridge 5 in a communicable manner by fitting the cartridge 5 into a connector (not shown). The CPU 31 accesses the backup memory provided in the cartridge 5 via the external memory I / F 34. The controller I / F 35 connects the external device and the game apparatus 3 so that they can communicate with each other by a connector (not shown). For example, the controller 6 is engaged with the connector via a connection cord and connected to the game apparatus 3 via the controller I / F 35. The GPU 36 is configured by a semiconductor chip that performs processing such as vector calculation and rendering processing necessary for displaying 3D graphics in response to an instruction from the CPU 31, and a game image rendered by the GPU 36 is displayed on the television 2. Is done. In addition, the game sound reproduced in the game process is output from the speaker 7 via the audio I / F 38. The speaker 7 is typically built in the television 2. The optical disk drive 37 reads various data such as a game program, image data, and sound data stored in the optical disk 4 in response to an instruction from the CPU 31.

  Hereinafter, game processing executed in the game apparatus 3 by the game program stored on the optical disc 4 will be described. First, an outline of game processing in the present embodiment will be described. FIG. 3 is a diagram illustrating an example of a game image in the present embodiment. In the present embodiment, a three-dimensional game space is constructed in the game apparatus 3, and an image obtained by viewing the game space from a predetermined viewpoint is displayed on the screen of the television 2. In the following, a case where a state in which a mycelial root (mycelium object 81 shown in FIG. 3) extends from a spore on the ground (spore object 82 shown in FIG. 3) in the game space will be described as an example. That is, in FIG. 3, a ground object 80, a mycelium object 81 imitating mycelia, and a spore object 82 imitating spores are arranged in the game space. The mycelium object 81 is disposed on the ground object (on the side closer to the viewpoint). The game device according to the present invention enables various displays using a single mycelium object. Although not shown in FIG. 3, in addition to the above objects, a player object or the like may appear in the game space.

  FIG. 4 is a diagram showing the mycelium object shown in FIG. As shown in FIG. 4, the mycelium object 81 is composed of a plurality of polygons. A texture for expressing the mycelia is mapped to each polygon constituting the mycelia object 81. Also, transparency is set at the vertex of each polygon. The transparency of each part of the polygon is determined from the transparency set at the vertex. In the process of generating the game image, the display color is determined based on the mapped texture color and the transparency of the polygon vertex. Here, the transparency is represented by α. Specifically, the transparency α is a value that can take a value in the range of 0 ≦ α ≦ 255, and the smaller the value, the higher the transparency. That is, if α = 0, it is transparent, and if α = 255, it is opaque. For example, when the transparency of the mycelium object 81 in a certain part is α = 0, the mycelium object 81 in the part is not displayed. That is, since the mycelium object is transparent, it cannot be seen on the screen, and only the ground is displayed on the screen. On the other hand, when the transparency of the mycelium object 81 in a certain part is α = 255, the mycelium object 81 in the part is displayed on the screen. Further, when the transparency is 0 <α <255, the display is translucent.

  In the present embodiment, the transparency set at the vertices of the polygons constituting the mycelium object 81 is determined based on the reference area determined by the reference position. Here, the reference position is a predetermined position set in the game space. In the present embodiment, the reference position is a position where the spore object 82 is arranged. The reference area is an area determined by the reference position. In the present embodiment, the reference area is an area included in a range within a predetermined distance from the reference position. In this embodiment, the transparency is set to α = 255 for the vertices included in the reference area. For vertices not included in the reference area, the transparency is set to α = 0. Therefore, the mycelium object 81 is displayed in the area included in the reference area, and the mycelium object 81 is not displayed outside the reference area (it is not visible because it is transparent). As described above, if different transparency is set depending on whether or not the vertex is included in the reference area, a part of the mycelium object can be seen variously by arbitrarily specifying the reference position and the range of the reference area. Various displays can be performed without changing the mycelium object 81 itself. For example, only the vicinity of the center of the mycelium object 81 shown in FIG. 4 can be displayed, or only the right side can be displayed.

  In the present embodiment, the position of the spore object 82 is set as the reference position. However, a predetermined position in the game space may be designated as the reference position without arranging a special object. In the present embodiment, the reference region is a region within a predetermined distance from the reference position. However, it goes without saying that the shape of the region may be other than a circle and can take various shapes.

  FIG. 5 is a diagram illustrating the relationship between the range of the reference region and the transparency. Here, in FIG. 5, the vertex of the polygon indicated by a white circle represents a vertex set with transparency α = 0, and the vertex of the polygon indicated with a black circle represents a vertex set with transparency α = 255. In FIG. 5, the reference position is set at the center of the mycelium object. FIG. 5A is a diagram illustrating a case where the reference area 83 includes the entire mycelium object 81. In this case, the transparency of the vertices of each polygon constituting the mycelia object 81 is all set to α = 255. Accordingly, in this case, the entire mycelium object 81 is displayed on the screen. FIG. 3 described above is a display example of the mycelium object 81 in the case of FIG. On the other hand, FIG. 5B is a diagram showing a case where the reference area 83 includes a part of the mycelia object 81. In this case, only the vicinity of the center of the mycelia object 81 is included in the reference region 83. That is, only the vertices included in the reference area 83 among the vertices of each polygon constituting the mycelia object 81 are set to α = 255. Of the vertices of each polygon constituting the mycelia object 81, the vertices located outside the reference area 83 are set to α = 0. FIG. 6 is a diagram showing a screen display example in the case shown in FIG. In the case of FIG. 5B, as shown in FIG. 6, only the vicinity of the center of the mycelium object 81 is displayed. It can be seen that the mycelium object 81 shown in FIG. 6 is smaller than the case shown in FIG.

  As described above, according to the present embodiment, the mycelia object can be displayed in various shapes and sizes by arranging the mycelia object in advance and appropriately specifying the reference position and the reference area. In the present embodiment, it is assumed that the size of the reference area changes as the game progresses. Specifically, when the player object attacks the spore object 82, the game device reduces the reference area. Thereby, the mycelium displayed on the screen is reduced. As a result, it is possible to express how the hyphae become smaller as a result of the weakening of the spore force by the attack of the player object. In other embodiments, the reference position may be changed according to the progress of the game. For example, the spore object may be moved, and the reference position may be changed according to the position of the spore object. Further, the reference position and the reference area may be changed with the passage of time.

  In the present embodiment, the game apparatus 3 determines that α = 255 immediately after being included in the reference area for a vertex that is newly included in the reference area as a result of the change in the range of the reference area. Shall not. That is, the game apparatus 3 adds a predetermined value (for example, 10) to the transparency α for each frame until the transparency value becomes α = 255 for the vertex. As a result, α gradually increases, so that the part of the mycelium object that is newly included in the reference area is displayed so that the opacity gradually increases. Accordingly, it is possible to perform realistic display so that the portion of the mycelium object gradually emerges. In the same manner as described above, the game apparatus 3 changes the transparency for each frame until the transparency value becomes α = 0 for the vertex that is no longer included in the reference area as a result of the change in the range of the reference area. A predetermined value (for example, 10) is subtracted from α. As a result, α gradually decreases, so that a portion of the mycelium object that is no longer included in the reference region is displayed so that the transparency gradually increases. Accordingly, it is possible to perform realistic display such that the mycelium object gradually disappears.

  Next, details of the game process executed in the game apparatus 3 will be described. When the power of the game apparatus 3 is turned on, the CPU 31 of the game apparatus 3 executes a startup program stored in a boot ROM (not shown) to initialize each unit such as the work memory 32. Then, the game program stored in the optical disc 4 is read into the work memory 32 via the optical disc drive 37, and the execution of the game program 41 read into the work memory 32 is started. The flowchart shown in FIG. 7 shows processing after the above processing operation. Note that the processing shown in this flowchart is performed as a cooperative operation of the CPU 31 and the GPU 36, but it is possible to cause almost all of the processing to be performed only by the CPU 31, for example.

  FIG. 7 is a flowchart showing a flow of game processing executed in the game apparatus 3 according to the present embodiment. In this flowchart, description of game processing not directly related to the present invention is omitted, and screen processing for displaying mycelia and spores on the ground of the game space will be mainly described. Steps 10 to 19 shown in FIG. 7 (“step” in the figure is simply abbreviated as “S”) are processes for displaying a game image for one frame.

  In FIG. 7, first, in step 10, a reference position is set. In the present embodiment, the reference position is set to a predetermined position in the game space. In other embodiments, the reference position may be changed over time (for example, every frame). That is, the reference position may change with time. For example, the game apparatus 3 may move and set the reference position together with the spore object.

  In step 11 following step 10, each object is placed in the game space. Specifically, the ground object and the mycelium object are arranged at a predetermined position, and the spore object is arranged at the reference position. In addition to these objects, player objects and the like may be appropriately arranged. Alternatively, the movement of the spore object may be controlled so that the current position of the spore object is set as the reference position.

  In step 12 following step 11, the range of the reference region is determined. The range of the reference region is a range within a predetermined distance from the reference position. In the present embodiment, the predetermined distance is determined according to a rule relating to game progress. Specifically, in step 12, it is determined whether or not the player object has attacked the spore object. When the player object attacks the spore object, the predetermined distance is changed short by a predetermined length. On the other hand, when the player object is not attacking the spore object, the predetermined distance is changed to be longer by a predetermined length (that is, when the player object is not attacking the spore object, Over time (or according to a predetermined condition), the size of the mycelium object gradually increases). Note that an initial value is predetermined for the predetermined distance, and is set to the length of the initial value at the start of the game. By the above steps 10 and 12, the position and size of the reference area are determined.

  In step 13 following step 12, an initial value of transparency of each vertex of the polygon constituting the mycelium object is set. Here, the initial value of each vertex is α = 255. That is, the entire mycelium object is displayed in the initial state. After step 13, the process of step 14 is performed.

  In step 14, one vertex (vertex X) of the polygon vertices of the mycelium object is designated. The vertex X is designated so that the vertex already designated in the loop of steps 14 to 18 is not designated again. For the vertices designated in step 14, transparency changing processing is performed in steps 15-17. The transparency changing process is a process of setting a different transparency depending on whether or not it is included in the reference area. Note that only the polygons constituting the mycelia object are to be subjected to the transparency changing process, and in step 14, the vertexes of the polygons are designated. Polygons constituting other objects (ground objects, spore objects, etc.) are not subjected to the transparency change process. That is, in step 14, the mycelium object is selected from the objects arranged in the game space, and only the selected mycelia object is the target of the transparency changing process. Here, an object (in this embodiment, a mycelia object) that is a target of the transparency changing process is referred to as a target object. Each object placed in the game space has a flag for determining whether or not to be subject to transparency change processing, and based on this flag, selection processing for determining whether or not to be subject to transparency change processing is performed. You may do it. In addition, a list of objects that are targets of transparency change processing may be stored, and selection processing may be performed based on the list.

  In step 15 following step 14, it is determined whether or not the vertex X designated in step 14 is included in the reference region. That is, it is determined whether or not the distance between the vertex X and the reference position is shorter than the predetermined distance determined in step 12. The process of step 15 is a process of specifying vertices existing in the reference area for the polygons constituting the target object. When the vertex X is included in the reference area in the determination of step 15, the process of step 16 is performed. That is, the process of step 16 is performed on the vertices specified as vertices existing in the reference area. On the other hand, if the vertex X is not included in the reference area in the determination of step 15, the process of step 17 is performed. That is, the process of step 17 is performed for vertices that are not specified as vertices existing in the reference area.

  In step 16, a predetermined value (here, 10) is added to the value of transparency α currently set for the vertex X. However, when the value of transparency α exceeds 255 by adding a predetermined value, it is set to 255. If the value of transparency α currently set for the vertex X is α = 255, the value of α remains unchanged. Therefore, the value of the vertex X gradually approaches 255 by performing this step 16 every frame. That is, for vertices included in the reference region, α = 255 is set as a target value, and a predetermined value is added every frame until α reaches the target value (may be added every predetermined frame). This target value is determined in advance in the game program 41 and is stored in the work memory 32 at the start of the game process.

  On the other hand, in step 17, a predetermined value (here, 10) is subtracted from the value of transparency α currently set for the vertex X. However, when the value of transparency α is smaller than 0 by subtracting a predetermined value, it is set to 0. Also, if the value of transparency α currently set for the vertex X is α = 0, the value of α remains unchanged. Therefore, the value of the vertex X gradually approaches 0 by performing this step 16 every frame. That is, for vertices located outside the reference area, α = 0 is set as a target value, and a predetermined value is subtracted every frame until α reaches the target value. This target value is determined in advance in the game program 41 and is stored in the work memory 32 at the start of the game process.

  In the present embodiment, the predetermined value in step 16 and the predetermined value in step 17 are the same value, but may be different values. Further, the predetermined value in steps 16 and 17 is preferably smaller than the difference between the two target values (the target value in step 16 and the target value in step 17). This is because when the predetermined value is smaller than the difference between the two target values, it takes time for a plurality of frames in order for the transparency to change from one target value to the other target value. Thereby, as a result of gradually changing the transparency, it is possible to make a realistic expression such that the target object gradually rises or the target object gradually disappears. In this embodiment, when the mycelium object becomes larger as the range of the reference area gradually increases, the enlarged portion is displayed so as to gradually rise, so that the state of mycelia growing is realistically expressed. be able to. Further, when the mycelial object becomes smaller due to the narrowing of the range of the reference area, the smaller portion is displayed so as to gradually disappear, so that the state of the mycelia weakening can be realistically expressed. Further, even when the reference area moves, it is possible to express that the area before the movement gradually disappears and the area after the movement gradually rises. Note that the predetermined value in step 16 and the predetermined value in step 17 may not be fixed values. For example, the predetermined value may be determined according to the magnitude of the difference between the current value and the target value (for example, when the difference is large, the predetermined value is increased).

  After step 16 or 17, the process of step 18 is performed. In step 18, it is determined whether or not the transparency setting process (the processes in steps 15 to 17) has been performed on all the vertices of the polygon that constitutes the target object. If it is determined in step 18 that the transparency setting process is not performed for any vertex, the process returns to step 14. That is, the processes of steps 14 to 18 are repeated until the transparency setting process is performed for all the vertices constituting the object that is the object of the transparency setting process. On the other hand, when the transparency setting process is performed for all the vertices in the determination of step 18, the process of step 19 is performed. That is, in step 19, a drawing process is performed on the objects arranged in the game space. Specifically, a game image in which the game space is viewed from a predetermined viewpoint is generated using the texture for the object placed in the game space, the transparency set for the object, and the like. The generated game image data is stored in the VRAM 33, and the game image is displayed on the television 2. One frame of the game image is displayed on the television 2 by the processes in steps 10 to 19 described above. Thereafter, the game process is continued by repeating the processes of steps 10 to 19. This is the end of the description of the game process.

  As described above, according to the present embodiment, the target object is prepared in advance, and the target object is displayed in various forms without changing the target object itself by designating the reference area that affects the transparency. be able to. Therefore, the data amount of the object can be reduced and various variations can be given to the game image by simple processing.

  In addition to the example described in the above embodiment, for example, an object for expressing water is placed on the ground object and the range of the reference area is changed to increase with time. Can realistically represent how the water springs up. Further, in this case, if the reference region is moved, it is possible to realistically represent how the water mass moves.

  In the above embodiment, the reference area is always set for each frame. However, in other embodiments, the reference area may be set only when necessary. For example, as another example of the game image, an example in which a human character and its footprint are displayed can be considered. Specifically, the footprint object is placed on the ground, and the transparency of the footprint object is set to α = 0 (that is, transparent) in the initial state. Then, in accordance with the timing when the human character walks, a reference region is set at the position of the human character's feet for a predetermined time after the foot is removed. Thereby, footprints remaining on the ground can be expressed. Further, by performing the above-described transparency setting process (steps 15 to 17 in FIG. 7) when canceling the setting of the reference region, it is possible to realistically express how the footprints gradually disappear.

  In the above embodiment, a relatively large α value is set for the vertices included in the reference area among the vertices of the polygons constituting the target object. In other words, the portion of the target object that is included in the reference area is actually displayed. Here, in another embodiment, the game device actually displays a portion of the target object that is located outside the reference region by making it opaque, and displays the portion that is included in the reference region by making it transparent. It may not be done.

  Further, in the above embodiment, the transparency is set for the vertex of the polygon, and the transparency of the portion other than the vertex is determined from the transparency of the vertex. Here, in another embodiment, transparency may be set for the polygon itself. That is, for the polygons constituting the target object, depending on whether the polygon is included in the reference area (depending on whether the whole polygon is included in the reference area, or in the polygon Depending on whether or not the fixed point is included in the reference area), the transparency of the polygon itself may be changed and set.

  In the above embodiment, the transparency target value is set to α = 255 (that is, opaque) for the portion included in the reference area of the target object, and the portion of the target object that is not included in the reference area. The target value was α = 0 (ie, transparent). Here, in another embodiment, the target value may be a value that is translucent (here, 0 <α <255). For example, when a cloud object is displayed or when a smoke object around a flame is displayed, a value that is translucent may be set as the target value.

  The present invention can be used for a game device or a game program for the purpose of generating various game images by a simple method using transparency.

External view of game system 1 Functional block diagram of game system 1 The figure which shows an example of the game image in this embodiment The figure which shows the mycelium object shown in FIG. Diagram showing the relationship between the range of the reference area and transparency The figure which shows the example of a screen display in the case shown in FIG.5 (b) The flowchart which shows the flow of the game process performed in the game device 3

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Game system 2 Television receiver 3 Stationary game device 4 Optical disk 5 Cartridge 6 Controller 31 CPU
32 Work memory 41 Game program 80 Ground object 81 Mycelium object 82 Spore object 83 Reference area

Claims (7)

A game device for displaying an image of a three-dimensional game space on a display device,
Object placement means for placing at least one object composed of polygons in the game space;
Object selection means for selecting at least one of the objects arranged in the game space as a target object;
Reference position setting means for setting a reference position in the game space;
A specifying means for specifying a polygon existing in a reference area with reference to the reference position or a vertex of the polygon for the polygon constituting the target object;
Based on the transparency set by the transparency setting means, the transparency setting means for setting different transparency depending on whether or not it is specified by the specifying means when setting the transparency for the polygon of the target object or the vertex of the polygon A game device comprising display control means for drawing the target object and displaying an image of the game space on the display device. The object arrangement means arranges a reference object in the game space,
The game apparatus according to claim 1, wherein the reference position setting unit sets a position of the reference object in the game space as the reference position.   The game according to claim 1, wherein the transparency setting means sets the transparency so that a polygon or a vertex of the polygon not specified by the specifying means is more transparent than a polygon or a vertex of the polygon specified by the specification means. apparatus.   The game device according to claim 1, further comprising region changing means for changing a range of the reference region according to a predetermined condition.   The transparency setting means sets a target value indicating a transparency value to be taken by the polygon or the vertex of the polygon so as to be different depending on whether or not it is specified by the specifying means, and the polygon or polygon 5. The game device according to claim 4, wherein the transparency value of the vertex of the game is increased or decreased by a predetermined amount from the current transparency at predetermined time intervals until the target value is reached.   The game device according to claim 4, wherein the predetermined condition is a condition related to an action of a game object appearing in the game space. A game program for causing a computer of a game device to display an image of a three-dimensional game space on a display device,
The computer,
Object placement means for placing at least one object composed of polygons in the game space;
Object selection means for selecting at least one of the objects arranged in the game space as a target object;
Reference position setting means for setting a reference position in the game space;
A specifying means for specifying a polygon existing in a reference area with reference to the reference position or a vertex of the polygon for the polygon constituting the target object;
Based on the transparency set by the transparency setting means, the transparency setting means for setting different transparency depending on whether or not it is specified by the specifying means when setting the transparency for the polygon of the target object or the vertex of the polygon A computer-readable game program that functions as display control means for drawing the target object and displaying an image of the game space on the display device.

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