JP4838230B2 - Image processing apparatus, image processing apparatus control method, and program - Google Patents

Description

  The present invention relates to an image processing apparatus, a control method for the image processing apparatus, and a program.

There is known an image processing apparatus that displays an image representing a virtual three-dimensional space viewed from a virtual camera (viewpoint). An example of such an image processing device is a game device.
JP 2007-082859 A

  In the image processing apparatus (game apparatus) as described above, for example, there is a case where it is desired to display on the screen an image that expresses a relatively fine state of grass growing on a relatively wide area of the ground. In realizing such image display, it is strongly desired to reduce the time and effort required for the display.

  The present invention has been made in view of the above problems, and its purpose is, for example, reduction of time and labor when realizing display of an image that expresses a state where grass grows in a relatively wide range of places in a relatively fine manner. An object of the present invention is to provide an image processing apparatus, a control method for the image processing apparatus, and a program.

  In order to solve the above problem, an image processing apparatus according to the present invention is a first image processing apparatus that stores an image representing a state in which a virtual three-dimensional space is viewed from a virtual camera, and stores a first unit texture image. Unit texture image storage means, second unit texture image storage means for storing a second unit texture image, and first texture image obtained by arranging a plurality of the first unit texture images. Texture image obtaining means, second texture image obtaining means for obtaining a second texture image obtained by arranging a plurality of the second unit texture images, and the first texture image and / or the second texture image. Transparency data storage means for storing transparency data indicating the transparency of each pixel of the texture image, the first texture image and the second texture image The semi-transparent synthetic texture images comprising, based on the transparency data, characterized in that it comprises a mapping means for mapping the object placed in the virtual three-dimensional space.

  The image processing apparatus control method according to the present invention stores the first unit texture image in the image processing apparatus control method for displaying an image representing a state in which the virtual three-dimensional space is viewed from the virtual camera. Reading out the first unit texture image from the first unit texture image storage means, and reading out the second unit texture image from the second unit texture image storage means storing the second unit texture image. A first texture image obtaining step for obtaining a first texture image obtained by arranging a plurality of the first unit texture images, and a second texture obtained by arranging a plurality of the second unit texture images. A second texture image acquisition step of acquiring an image, and the first texture image or / and the second texture image A step of reading out the transparency data from transparency data storage means for storing transparency data indicating the transparency of the pixels, and translucent synthesis of the first texture image and the second texture image based on the transparency data. Mapping step of mapping the texture image to the object arranged in the virtual three-dimensional space.

  The program according to the present invention is a home game machine (stationary game machine), a portable game machine, an arcade game machine as an image processing device that displays an image representing a virtual three-dimensional space viewed from a virtual camera. , A program for causing a computer such as a mobile phone, a personal digital assistant (PDA), or a personal computer to function, a first unit texture image storage means for storing a first unit texture image, a second unit texture image Second unit texture image storage means for storing, first texture image acquisition means for acquiring a first texture image formed by arranging a plurality of the first unit texture images, and a plurality of the second unit texture images. Second texture image acquisition means for acquiring a second texture image formed by arrangement, the first texture image or / And transparency data storage means for storing transparency data indicating the transparency of each pixel of the second texture image, and translucent synthesis of the first texture image and the second texture image based on the transparency data This is a program for causing the computer to function as mapping means for mapping the texture image formed on the object arranged in the virtual three-dimensional space.

  An information storage medium according to the present invention is a computer-readable information storage medium recording the above program. A program distribution apparatus according to the present invention is a program distribution apparatus that includes an information storage medium that records the program, reads the program from the information storage medium, and distributes the program. The program distribution method according to the present invention is a program distribution method for reading and distributing the program from an information storage medium storing the program.

  The present invention relates to an image processing apparatus that displays an image representing a state in which a virtual three-dimensional space is viewed from a virtual camera. In the present invention, the first unit texture image and the second unit texture image are stored. In addition, a first texture image obtained by arranging a plurality of first unit texture images is obtained, and a second texture image obtained by arranging a plurality of second unit texture images is obtained. In the present invention, transparency data for specifying the transparency of each pixel of the first texture image or / and the second texture image is stored. Then, a texture image obtained by translucently combining the first texture image and the second texture image based on the transparency data is mapped to an object arranged in the virtual three-dimensional space. For example, the “first unit texture image” is a texture image that finely represents soil. Further, the “second unit texture image” is a texture image that represents grass precisely. The “object” is, for example, a ground object. According to the present invention, for example, it is possible to reduce time and labor when realizing display of an image that expresses a state where grass grows on a relatively wide area of the ground in a relatively fine manner.

  In the aspect of the invention, the transparency data is data indicating a change with time of transparency of each pixel of the first texture image or / and the second texture image, and the mapping unit includes: The transparency of each pixel of the first texture image and / or the second texture image is changed based on the transparency data, and the texture image mapped to the object is changed over time. May be.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. Here, a case where the present invention is applied to a game device which is an aspect of an image processing device will be described. The game device according to the embodiment of the present invention is realized by, for example, a home game machine (stationary game machine), a portable game machine, a mobile phone, a personal digital assistant (PDA), a personal computer, or the like. Here, a case where the game device according to the embodiment of the present invention is realized by a consumer game machine will be described.

  FIG. 1 is a diagram showing an overall configuration of a game apparatus (image processing apparatus) according to an embodiment of the present invention. The game device 10 shown in FIG. 1 includes a consumer game machine 11, a monitor 32, a speaker 34, and an optical disk 36. The monitor 32 and the speaker 34 are connected to the consumer game machine 11. As the monitor 32, for example, a home television receiver is used. As the speaker 34, for example, a speaker built in a home television receiver is used. The optical disk 36 is an information storage medium and is attached to the consumer game machine 11.

  The home game machine 11 is a known computer game system. The home game machine 11 includes a bus 12, a microprocessor 14, a main memory 16, an image processing unit 18, an input / output processing unit 20, an audio processing unit 22, an optical disc reading unit 24, a hard disk 26, a communication interface 28, and a controller 30. . Components other than the controller 30 are accommodated in the housing of the consumer game machine 11.

  The bus 12 is for exchanging addresses and data among the units of the consumer game machine 11. The microprocessor 14, the main memory 16, the image processing unit 18, and the input / output processing unit 20 are connected by the bus 12 so that mutual data communication is possible.

  The microprocessor 14 controls each unit of the consumer game machine 11 based on an operating system stored in a ROM (not shown), a program and data read from the optical disk 36 or the hard disk 26. The main memory 16 includes a RAM, for example. Programs and data read from the optical disk 36 or the hard disk 26 are written in the main memory 16 as necessary. The main memory 16 is also used as a working memory for the microprocessor 14.

  The image processing unit 18 includes a VRAM. The image processing unit 18 draws a game screen on the VRAM based on the image data sent from the microprocessor 14. The image processing unit 18 converts the game screen drawn on the VRAM into a video signal and outputs the video signal to the monitor 32 at a predetermined timing. That is, the image processing unit 18 receives vertex coordinates, vertex color information (RGB values), texture coordinates, alpha values, and the like of each polygon in the viewpoint coordinate system from the microprocessor 14. Then, using such information, the color information, Z value (depth information), alpha value and the like of each pixel constituting the display image are drawn in the display buffer of the VRAM. At this time, the texture image is written in the VRAM in advance, and the region in the texture image specified by each texture coordinate is mapped (pasted) to the polygon specified by the vertex coordinate corresponding to the texture coordinate. It has become. The display image generated in this way is output to the monitor 32 at a predetermined timing.

  The input / output processing unit 20 is an interface for the microprocessor 14 to access the audio processing unit 22, the optical disk reading unit 24, the hard disk 26, the communication interface 28, and the controller 30. Connected to the input / output processing unit 20 are an audio processing unit 22, an optical disk reading unit 24, a hard disk 26, a communication interface 28, and a controller 30.

  The audio processing unit 22 includes a sound buffer. Various sound data such as game music, game sound effects, and messages read from the optical disk 36 or the hard disk 26 are stored in the sound buffer. The audio processing unit 22 reproduces various audio data stored in the sound buffer and outputs it from the speaker 34.

  The optical disk reading unit 24 reads programs and data recorded on the optical disk 36 in accordance with instructions from the microprocessor 14. Here, the optical disc 36 is used to supply the program and data to the consumer game machine 11, but other information storage media such as a memory card may be used. Further, for example, a program or data may be supplied to the consumer game machine 11 from a remote place via a communication network such as the Internet.

  The hard disk 26 is a general hard disk device (auxiliary storage device). The hard disk 26 stores programs and data. The communication interface 28 is an interface for connecting the consumer game machine 11 to a communication network such as the Internet by wire or wireless.

  The controller 30 is general-purpose operation input means for the user to input various game operations. The input / output processing unit 20 scans the state of each unit of the controller 30 at regular intervals (for example, every 1/60 seconds). Then, the input / output processing unit 20 passes an operation signal indicating the scan result to the microprocessor 14 via the bus 12. The microprocessor 14 determines the player's game operation based on the operation signal. A plurality of controllers 30 can be connected to the consumer game machine 11. The microprocessor 14 executes game control based on an operation signal input from each controller 30.

  In the game apparatus 10 having the above-described configuration, for example, an action game is executed in which the player character object defeats the enemy character object in accordance with the operation of the player. This action game is realized by executing a game program read from the optical disk 36 or the hard disk 26.

  A virtual three-dimensional space is constructed in the main memory 16 of the game apparatus 10. FIG. 2 shows an example of a virtual three-dimensional space. A ground object 42 is arranged in the virtual three-dimensional space 40 shown in FIG. On the ground object 42, a player character object 44 and an enemy character object 46 are arranged. In the virtual three-dimensional space 40, a virtual camera 48 that moves according to the movement of the player character object 44 is set. A game screen representing a state in which the virtual three-dimensional space 40 is viewed from the virtual camera 48 is generated, and the game screen is displayed on the monitor 32.

  Hereinafter, in the above-described game apparatus 10, a technique for suitably realizing display of an image that expresses a state in which grass grows in places on a relatively wide range of ground will be described.

  FIG. 3 is a flowchart mainly showing processing related to the present invention among processing executed by the game apparatus 10 every predetermined time (for example, 1/60 seconds). The process shown in FIG. 3 is executed according to a program stored in the optical disc 36 or the hard disk 26.

  As shown in FIG. 3, environmental processing is first executed (S101). In the environment processing, the positions and orientations of all objects in the virtual three-dimensional space 40 are calculated. In the environment processing, the viewpoint coordinates, the line-of-sight direction, and the angle of view are also calculated. For example, a fixed value is used for the angle of view. The virtual camera 48 is virtually arranged in the virtual three-dimensional space 40 according to the viewpoint coordinates, the line-of-sight direction, and the angle of view calculated in this way.

  Thereafter, geometry processing is executed (S102). In the geometry processing, from the world coordinate system (Xw, Yw, Zw) to the viewpoint coordinate system (that is, the coordinate system having the viewpoint coordinates as the origin, the gaze direction as the Z direction, the horizontal direction as the X direction, and the vertical direction as the Y direction). The coordinate transformation is performed. Also, vertex color information is calculated based on the light source information for the polygons constituting each object. Further, clipping processing is also performed.

  Thereafter, a rendering process is executed (S103). That is, the microprocessor 14 passes the vertex coordinates, vertex color information, texture coordinates, and the like of each polygon within the field-of-view range to the image processing unit 18. Then, the image processing unit 18 forms a game screen on the VRAM based on the information. The game screen is formed by converting each object described in the viewpoint coordinate system to the screen coordinate system. In this way, a game screen representing the virtual three-dimensional space 40 viewed from the virtual camera 48 is drawn on the VRAM. The game screen drawn on the VRAM is displayed and output on the monitor 32 at a given timing (S104).

  Here, the mapping of the texture image onto the ground object 42 will be described in detail.

  First, data related to mapping of a texture image to the ground object 42 will be described.

  The optical disk 36 (first unit texture image storage means and second unit texture image storage means) has a unit texture image (first unit texture image) representing soil and a unit texture image (second second) representing grass. Unit texture image) is stored. The soil is drawn relatively finely (with relatively high resolution) in the soil unit texture image, and the grass is drawn relatively finely (with relatively high resolution) in the grass unit texture image. In addition, the size (width) of these unit texture images is smaller than that of the ground object 42. In the following, the soil unit texture image 50 is represented as shown in FIG. 4, and the grass unit texture image 52 is represented as shown in FIG. The optical disk 36 stores other data related to the mapping of the texture image onto the ground object 42. This data will be described later.

  Next, processing related to mapping of a texture image onto the ground object 42 will be described. FIG. 6 is a flowchart showing processing relating to mapping of the texture image onto the ground object 42. The process shown in FIG. 6 is executed according to a program stored in the optical disk 36 or the hard disk 26.

  As shown in FIG. 6, the microprocessor 14 and the image processing unit 18 (first texture image acquisition unit) repeatedly arrange the soil unit texture images 50 in the vertical and / or horizontal directions to thereby obtain a soil texture image (first texture image). 1 texture image) is generated on the VRAM (S201). FIG. 7 shows an example of the soil texture image 60 generated in this step. In FIG. 7, the dotted line is drawn to clarify that the soil unit texture image 50 is repeatedly arranged, and is not actually represented. The size (width) of the soil texture image 60 corresponds to the size of the ground object 42. That is, the soil texture image 60 has a size (width) that can cover the entire ground object 42. That is, the soil texture image 60 has at least the same size (width) as the ground object 42.

  In addition, the microprocessor 14 and the image processing unit 18 (second texture image acquisition unit) repeatedly arrange the grass unit texture images 52 in the vertical and / or horizontal directions, whereby the grass texture image (second texture image). Is generated on the VRAM (S202). FIG. 8 shows an example of the grass texture image 62 generated in this step. In FIG. 8 as well, the dotted line is drawn to clarify that the grass unit texture image 52 is repeatedly arranged, and is not actually represented. The size (width) of the grass texture image 62 also corresponds to the size of the ground object 42. That is, the grass texture image 62 also has a size (width) that can cover the entire ground object 42. That is, the grass texture image 62 also has at least the same size (width) as the ground object 42. The soil texture image 60 and the grass texture image 62 have the same size (width).

  Thereafter, the microprocessor 14 and the image processing unit 18 (mapping means) superimpose the soil texture image 60 and the grass texture image 62 and map them to the ground object 42 (S203). That is, a texture image formed by translucently combining the soil texture image 60 and the grass texture image 62 is mapped to the ground object 42.

  As data related to the processing in this step, a grayscale texture image is stored on the optical disc 36. FIG. 9 shows an example of this texture image. In FIG. 9, the shaded portion indicates that the color of the portion is gray. Further, the density of the gray portion is not constant, and gradually becomes darker or lighter so as to smoothly change from black to white or from white to black. The size (width) of the texture image 70 corresponds to the size of the ground object 42 (or the grass texture image 62 or the soil texture image 60). In the case of the present embodiment, the size (width) of the texture image 70 is the same size as the grass texture image 62 (or the soil texture image 60). The texture image 70 is applied to the ground object 42 together with the grass texture image 62 and the soil texture image 60, whereby the transparency of each pixel of the grass texture image 62 (or the soil texture image 60) (alpha value: ratio of translucent composition). ) To control. That is, the texture image 70 serves as transparency data indicating the transparency of each pixel of the grass texture image 62 (or the soil texture image 60). Here, the texture image 70 will be described as a grayscale image of 256 gradations that shows the transparency of each pixel of the grass texture image 62 in black and white. The white area 72 indicates that the pixel of the grass texture image 62 is set to be completely opaque. The black area 74 indicates that the pixel of the grass texture image 62 is set to be completely transparent. A gray region 76 (shaded portion) indicates that the pixel of the grass texture image 62 is set to be translucent. Note that the grayscale image of 256 gradations is data that holds the gray level of black and white with a value of 0 to 255, with the value “0” corresponding to black and the value “255” corresponding to white. Hereinafter, the texture image shown in FIG. 9 is referred to as “transparency data”.

  The RGB values (R, G, B) of each pixel of the ground object 42 (texture image mapped to the ground object 42) are expressed by the following equations (1) to (3). In the following formulas (1) to (3), (Ra, Ga, Ba) indicates the RGB value of the target pixel of the soil texture image 60, and (Rb, Gb, Bb) is the target pixel of the grass texture image 62. RGB values are shown. Α indicates transparency (alpha value) specified from the color information (256 gray scales) of the target pixel of the transparency data.

R = (Ra * ((255−α) / 255)) + (Rb * (α / 255)) (1)
G = (Ga * ((255−α) / 255)) + (Gb * (α / 255)) (2)
B = (Ba * ((255−α) / 255)) + (Bb * (α / 255)) (3)

  As described above, the ground object 42 is mapped with a texture image obtained by translucently combining the soil texture image 60 and the grass texture image 62 according to the transparency data. FIG. 10 shows an example of a texture image 80 mapped to the ground object 42. In FIG. 10, the solid line portion indicates that the soil texture image 60 and the grass texture image 62 are set to be completely opaque, and the dotted line portion indicates that the soil texture image 60 and the grass texture image 62 are set to be translucent. Which indicates that.

  Note that the soil texture image 60 and the grass texture image 62 generated in S201 and S202 may continue to be held in the VRAM while the game is executed. In this case, the processes of S201 and S202 need only be executed once at the start of the game, for example.

  According to the game apparatus 10 described above, the soil unit texture image 50 and the grass unit texture image 52 are mapped to the ground object 42 while maintaining the texture resolution. As a result, the ground and grass appear relatively finely in an image (game screen) showing a situation where grass grows in a relatively wide area of the ground.

  By the way, as a technique for displaying an image (game screen) representing a relatively fine image of grass growing on a relatively wide area of the ground, the following technique is also conceivable. 11 and 12 are diagrams for explaining this technique. In this method, as shown in FIG. 11, the ground object 42 is a polygon (hereinafter referred to as “earth polygon”) 90 of a portion (a portion representing soil) to which the soil unit texture image 50 is mapped. A grass unit texture image 52 is divided in advance into polygons (portions representing grass) 92 (hereinafter referred to as “grass polygons”) to be mapped. Then, as shown in FIG. 12, the soil unit texture image 50 is mapped to the soil polygon 90. At this time, the soil unit texture image 50 is mapped while maintaining the resolution (texture resolution). Therefore, when the size (width) of the soil polygon 90 is larger than the soil unit texture image 50, the soil unit texture image 50 is repeatedly mapped to the soil polygon 90. Similarly, as shown in FIG. 12, a grass unit texture image 52 is mapped onto the grass polygon 92 while maintaining the resolution (texture resolution). That is, the grass unit texture image 52 is repeatedly mapped to the grass polygon 92. Even in this way, it is possible to display an image that represents a relatively fine image of grass growing in places on a relatively wide range of ground.

  However, in the above method, for example, when a lot of places where grass grows are provided, for example, when an image showing how grass grows is displayed, the ground object 42 must be divided into many polygons. No longer. In the game development process, it may be necessary to change the place where the grass grows. In this case, in the above method, it is necessary to start again from the polygon division of the ground object 42. For this reason, in the above method, there is a case where it takes time for the game creator.

  In this regard, according to the technique adopted in the game apparatus 10, for example, even when a lot of grassy places are provided, it is sufficient to adjust the transparency data (see FIG. 9), and the ground object 42 can be converted into many polygons. There is no need to split it. Further, according to the technique adopted in the game apparatus 10, even if, for example, the place where grass grows is changed, it is sufficient to change the transparency data (see FIG. 9), and redo the polygonal division of the ground object 42. There is no need. Therefore, according to the technique employed in the game apparatus 10, it is possible to reduce the effort of the game creator.

  Further, according to the technique employed in the game apparatus 10, it is possible to smoothly change from a place where grass grows to a place where grass does not grow.

  11 and 12 (the method of dividing the ground object 42 into the soil polygon 90 and the grass polygon 92), the method smoothly changes from a place where grass grows to a place where grass does not grow. In order to make this happen, the following method can be considered. FIG. 13 is a diagram for explaining this method. In this method, as shown in FIG. 13, the grass polygon 92 is provided so that the grass polygon 92 partially overlaps the soil polygon 90. In the example shown in FIG. 13, a portion 90 a surrounded by a thick line in the earth polygon 90 and a portion 92 a surrounded by a thick line in the grass polygon 92 overlap each other. In addition, a portion 90b surrounded by a thick line in the soil polygon 90 and a portion 92b surrounded by a thick line in the grass polygon 92 overlap each other. Then, the transparency of the vertex 94 in the overlapping portion (the portions 92a and 92b) of the grass polygon 92 with the soil polygon 90 is adjusted so as to smoothly change from the place where the grass grows to the place where the grass does not grow. The

  However, in the above method, the transparency adjustment target is limited to the vertex 94, and thus the degree of freedom of transparency adjustment is low. For this reason, the smoothness of the change from a place where grass grows to a place where grass does not grow may not be as smooth as desired by the game creator.

  In this regard, according to the technique employed in the game apparatus 10, the transparency of the soil texture image 60 and the grass texture image 62 can be adjusted in units of pixels, so that the degree of freedom in adjusting the transparency can be improved. As a result, the smoothness of the change from the place where grass grows to the place where grass does not grow can be made as smooth as the game creator desires.

  The present invention is not limited to the embodiment described above.

  For example, the transparency data may be data indicating a change with time of transparency (α value) of each pixel of the grass texture image 62 (or the soil texture image 60). For example, the transparency data may be grayscale animation data representing a change in black and white density of each pixel every predetermined time (for example, 1/60 seconds). In this way, it is possible to change the transparency of the grass texture image 62 (or the soil texture image 60) mapped to the ground object 42 with the passage of time. As a result, for example, it is possible to display on the screen how the grassy place changes over time.

  In addition, for example, the present invention can be applied to a case other than displaying an image that expresses a state in which grass grows on a relatively wide area of the ground in a relatively fine manner. For example, the present invention can be applied to a case other than displaying an image representing a state in which things other than grass grow on places in a relatively wide range of ground.

  Further, for example, in the above description, the program is supplied to the game apparatus 10 via the optical disk 36 as an information storage medium. However, the program may be distributed to the game apparatus 10 via a communication network. FIG. 14 is a diagram showing an overall configuration of a program distribution system using a communication network. A program distribution method according to the present invention will be described with reference to FIG. As shown in FIG. 14, the program distribution system 100 includes a game device 10, a communication network 106, and a program distribution device 108. The program distribution device 108 includes a database 102 and a server 104. The communication network 106 includes, for example, the Internet and a cable television network. In this system, a database (information storage medium) 102 stores a program similar to the program stored on the optical disc 36. Then, when a consumer makes a game distribution request using the game apparatus 10, it is transmitted to the server 104 via the communication network 106. Then, the server 104 reads the program from the database 102 in response to the game distribution request, and transmits it to the game apparatus 10 that is the game distribution request source. Here, the game is distributed in response to the game distribution request, but the server 104 may transmit the game unilaterally. Further, it is not always necessary to distribute (collectively distribute) all programs necessary for realizing the game at a time, and a necessary portion may be distributed (divided distribution) according to the situation of the game. If the game is distributed via the communication network 106 in this way, the consumer can easily obtain the program.

It is a figure which shows the hardware constitutions of the game device (image processing device) which concerns on this Embodiment. It is a figure which shows an example of virtual three-dimensional space. It is a flowchart which shows the process which a game device performs. It is a figure which shows the unit texture image of soil. It is a figure which shows the unit texture image of grass. It is a flowchart which shows the process which a game device performs. It is a figure which shows a soil texture image. It is a figure which shows a grass texture image. It is a figure which shows transparency data. It is a figure which shows the texture image mapped by a ground object. It is a figure for demonstrating another method. It is a figure for demonstrating another method. It is a figure for demonstrating another method. It is a figure which shows the whole structure of the program delivery system which concerns on other embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Game device, 11 Home-use game machine, 12 bus | bath, 14 Microprocessor, 16 Main memory, 18 Image processing part, 20 Input / output processing part, 22 Sound processing part, 24 Optical disk reading part, 26 Hard disk, 28 Communication interface, 30 Controller, 32 Monitor, 34 Speaker, 36 Optical disk, 40 Virtual three-dimensional space, 42 Ground object, 44 Player character object, 46 Enemy character object, 48 Virtual camera, 50 Soil unit texture image, 52 Grass unit texture image, 60 Soil texture image, 62 grass texture image, 70 texture image, 72 white area, 74 black area, 76 gray area, 80 texture image, 90 earth polygon, 92 grass polygon, 94 vertex, 100 program Beam delivery system, 102 database, 104 server, 106 communications network, 108 a program distribution device.

Claims (3)

In an image processing apparatus that displays an image representing a virtual three-dimensional space viewed from a virtual camera
Soil unit texture image storage means for storing soil unit texture images;
A unit texture image storage unit for storing a unit texture image of grass;
Soil texture image acquisition means for acquiring a soil texture image formed by arranging a plurality of unit texture images of the soil;
Grass texture image acquisition means for acquiring a grass texture image formed by arranging a plurality of unit texture images of the grass;
Transparency data storage means for storing transparency data indicating transparency of each pixel of the soil texture image or / and the grass texture image;
Mapping means for mapping a texture image formed by translucent synthesis of the soil texture image and the grass texture image based on the transparency data to an object arranged in the virtual three-dimensional space;
Including
The transparency data is data indicating a change with time of transparency of each pixel of the soil texture image or / and the grass texture image,
The mapping means changes the transparency of each pixel of the soil texture image or / and the grass texture image based on the transparency data, and changes the texture image mapped to the object with time.
An image processing apparatus. In a control method for an image processing apparatus that displays an image representing a virtual three-dimensional space viewed from a virtual camera,
A microprocessor included in the image processing device reads the soil unit texture image from a soil unit texture image storage unit configured to store a soil unit texture image;
The microprocessor reading the grass unit texture image from a grass unit texture image storage means storing grass unit texture images;
A soil texture image acquisition step in which the microprocessor acquires a soil texture image formed by arranging a plurality of unit texture images of the soil;
A grass texture image acquisition step in which the microprocessor acquires a grass texture image obtained by arranging a plurality of unit texture images of the grass;
The microprocessor reading the transparency data from transparency data storage means for storing transparency data indicating transparency of each pixel of the soil texture image or / and the grass texture image;
The microprocessor and the mapping step of mapping said grass texture image and the soil texture image semitransparent synthesized texture image comprising, based on the transparency data, the object placed in the virtual three-dimensional space,
Including
The transparency data is data indicating a change with time of transparency of each pixel of the soil texture image or / and the grass texture image,
In the mapping step, the microprocessor changes the transparency of each pixel of the soil texture image and / or the grass texture image based on the transparency data, and the texture image mapped to the object is changed over time. Change
And a control method for the image processing apparatus. A program for causing a computer to function as an image processing apparatus that displays an image representing a virtual three-dimensional space viewed from a virtual camera,
Soil unit texture image storage means for storing soil unit texture images;
Grass unit texture image storage means for storing grass unit texture images;
Soil texture image acquisition means for acquiring a soil texture image formed by arranging a plurality of unit texture images of the soil;
A grass texture image obtaining means for obtaining a grass texture image formed by arranging a plurality of unit texture images of the grass;
Transparency data storage means for storing transparency data indicating transparency of each pixel of the soil texture image or / and the grass texture image; and
Mapping means for mapping a texture image formed by translucent synthesis of the soil texture image and the grass texture image based on the transparency data to an object arranged in the virtual three-dimensional space;
Function the computer as
The transparency data is data indicating a change with time of transparency of each pixel of the soil texture image or / and the grass texture image,
The mapping means changes the transparency of each pixel of the soil texture image or / and the grass texture image based on the transparency data, and changes the texture image mapped to the object with time.
A program characterized by that.

Images