JP4749131B2 - Program, information storage medium, and image generation system - Google Patents

Description

  The present invention relates to a program, an information storage medium, and an image generation system.

  2. Description of the Related Art Conventionally, an image generation system that generates an image that can be viewed from a virtual camera (a given viewpoint) in an object space that is a virtual three-dimensional space is known, and is popular as a device that can experience so-called virtual reality. Taking an image generation system capable of enjoying a racing game as an example, a player operates a player moving body to run in the object space, and competes with other moving bodies operated by other players and computers, so that the three-dimensional Enjoy the game.

In such an image generation system, it is an important technical problem to generate a more realistic image in order to improve the player's virtual reality. For this reason, it is desirable that the night driving scene can be more realistically expressed with respect to the illumination by the light from the moving body.
Japanese Patent No. 3254195

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a program, an information storage medium, and an image generation system that can realistically express illumination from a moving body.

  (1) The present invention is an image generation system for generating an image of an object space viewed from a given viewpoint, and includes model data of a moving object that serves as an illumination source that moves in the object space, and movement A model data storage unit that stores model data of a lighting target object that receives illumination from a body object, an object space setting unit that sets the moving body object and the lighting target object with respect to the object space, and the mobile object Using a texture storage unit that stores an illumination pattern texture in which an illumination pattern of illumination light emitted from the projection object is stored, and a projection matrix that represents a spread of the illumination light from the projection center set for the moving object, Vertex locus included in the model data of the object to be illuminated A texture coordinate calculation unit that calculates texture coordinates for the illumination pattern texture corresponding to the illumination pattern texture, and texture mapping the illumination pattern texture to the illumination target object based on the obtained texture coordinates, An image generation system comprising: an illuminated area setting unit that sets an illumination area; and an illumination processing unit that performs illumination processing that reflects the illumination light on the illumination target object based on setting information of the illuminated area Related to. The present invention also relates to a program that causes a computer to function as each of the above-described units and an information storage medium that stores the program.

  According to the present invention, the position of the illumination source varies due to the movement of the moving object, and the illuminated area is set for the illumination target object according to the varied position. That is, according to the present invention, it is possible to generate an image that realistically reflects the illumination from the moving body on the background or the like by setting the illuminated area according to the movement of the illumination source.

  (2) In the image generation system, the program, and the information storage medium of the present invention, the object data storage unit stores object data of a plurality of types of moving objects, and the object space setting unit includes the plurality of types of movements. One or more types of body objects are set in the object space, the texture storage unit stores a plurality of illumination pattern textures that differ depending on the type of the moving body object, and the illuminated region setting unit is configured to move the object An illumination pattern texture corresponding to the type of the body object may be texture-mapped to the illumination target object, and an illuminated area corresponding to the type of the moving body object may be set. In this way, since the illumination pattern is changed for each type of moving body, it is possible to perform realistic expression reflecting the effect of illumination according to the type of moving body on the background or the like.

  (3) In the image generation system, the program, and the information storage medium of the present invention, the object data storage unit stores object data of a plurality of types of mobile objects, and the object space setting unit includes the plurality of types of movements. One or more types of body objects are set in the object space, and the texture coordinate calculation unit calculates the texture coordinates using a different projection matrix depending on the type of the moving object, and the illuminated region setting unit However, an illuminated area corresponding to the type of the moving object may be set for the illumination target object based on the obtained texture coordinates. In this way, since the projection matrix is changed for each type of moving body, it is possible to perform realistic expression in which the range affected by the illumination light is changed according to the type of moving body.

  (4) In the image generation system, the program, and the information storage medium of the present invention, the texture storage unit stores a plurality of illumination pattern textures that differ depending on the type of event that occurs in the object space, and the illuminated area The setting unit may texture-map an illumination pattern texture corresponding to the type of the event to the illumination target object, and set an illuminated area corresponding to the event type for the illumination target object. In this way, by changing the illumination pattern according to the event, for example, realistic expression corresponding to a failure event of illumination can be performed.

  (5) In the image generation system, the program, and the information storage medium of the present invention, the texture coordinate calculation unit calculates the texture coordinates using a different projection matrix according to the type of event that occurs in the object space, The illuminated area setting unit may set an illuminated area corresponding to the type of event for the illumination target object based on the obtained texture coordinates. In this way, by changing the projection matrix according to the event, it is possible to perform realistic expression corresponding to, for example, a lighting failure event.

  (6) Moreover, in the image generation system, the program, and the information storage medium of the present invention, the illumination processing unit is based on an influence parameter with respect to the illumination light set in advance with respect to the vertex constituting the illumination target object. You may make it perform the process which adjusts the color obtained based on the model data of the said illumination target object as an illumination process. In this way, it is possible to reflect the influence of light received from the illumination source object on the illumination target object simply by adjusting the color according to the magnitude of the influence degree.

  Hereinafter, this embodiment will be described. In addition, this embodiment demonstrated below does not unduly limit the content of this invention described in the claim. In addition, all the configurations described in the present embodiment are not necessarily essential configuration requirements of the present invention.

  FIG. 1 shows an example of a functional block diagram of an image generation system (game system) of the present embodiment. Note that the image generation system of the present embodiment may have a configuration in which some of the components (each unit) in FIG. 1 are omitted.

  The operation unit 160 is for a player to input operation data of a player object (an example of a moving object, a player character operated by the player), and functions thereof are a lever, a button, a steering, a microphone, and a touch panel display. Alternatively, it can be realized by a housing or the like. The storage unit 170 serves as a work area for the processing unit 100, the communication unit 196, and the like, and its function can be realized by a RAM (VRAM) or the like.

  The information storage medium 180 (computer-readable medium) stores programs, data, and the like, and functions as an optical disk (CD, DVD), magneto-optical disk (MO), magnetic disk, hard disk, and magnetic tape. Alternatively, it can be realized by a memory (ROM). The processing unit 100 performs various processes of the present embodiment based on a program (data) stored in the information storage medium 180. That is, the information storage medium 180 stores a program for causing a computer to function as each unit of the present embodiment (a program for causing a computer to execute processing of each unit).

  The display unit 190 outputs an image generated according to the present embodiment, and its function can be realized by a CRT, LCD, touch panel display, HMD (head mounted display), or the like. The sound output unit 192 outputs the sound generated by the present embodiment, and its function can be realized by a speaker, headphones, or the like.

  The portable information storage device 194 stores player personal data, game save data, and the like. Examples of the portable information storage device 194 include a memory card and a portable game device. The communication unit 196 performs various controls for communicating with the outside (for example, a host device or other image generation system), and functions thereof are hardware such as various processors or communication ASICs, programs, and the like. It can be realized by.

  Note that a program (data) for causing a computer to function as each unit of this embodiment is distributed from the information storage medium of the host device (server) to the information storage medium 180 (storage unit 170) via the network and communication unit 196. May be. Use of the information storage medium of such a host device (server) can also be included in the scope of the present invention.

  The processing unit 100 (processor) performs processing such as game processing, image generation processing, or sound generation processing based on operation data and programs from the operation unit 160. Here, as the game process, a process for starting a game when a game start condition is satisfied, a process for advancing the game, a process for placing an object such as a character or a map, a process for displaying an object, and a game result are calculated. There is a process or a process of ending a game when a game end condition is satisfied. The processing unit 100 performs various processes using the main storage unit 172 in the storage unit 170 as a work area. The functions of the processing unit 100 can be realized by hardware such as various processors (CPU, DSP, etc.), ASIC (gate array, etc.), and programs.

  The processing unit 100 includes an object space setting unit 110, a movement / motion processing unit 112, a virtual camera control unit 114, a drawing unit 120, and a sound generation unit 130. Note that some of these may be omitted.

  The object space setting unit 110 is an object composed of various objects (polygons, free-form surfaces, subdivision surfaces, etc.) representing display objects such as characters, buildings, stadiums, cars, trees, pillars, walls, and maps (terrain). ) Is set in the object space. In other words, the position and rotation angle of the object in the world coordinate system (synonymous with direction and direction) are determined, and the rotation angle (rotation angle around the X, Y, and Z axes) is determined at that position (X, Y, Z). Arrange objects. In particular, in the present embodiment, object data of an illumination source object (moving object) that moves in the object space and object data of an illumination target object that receives illumination from the illumination source object are stored in the object data storage unit 176 of the storage unit 170. A process for arranging these objects in the object space is performed.

  The movement / motion processing unit 112 performs a movement / motion calculation (movement / motion simulation) of an object (character, car, train, airplane, etc.). That is, based on operation data input by the player through the operation unit 160, a program (movement / motion algorithm), various data (motion data), or the like, the object is moved in the object space, or the object is moved (motion, animation). ) Process. Specifically, object movement information (position, rotation angle, speed, or acceleration) and motion information (position or rotation angle of each part that constitutes the object) are sequentially transmitted every frame (1/60 seconds). Perform the required simulation process. A frame is a unit of time for performing object movement / motion processing (simulation processing) and image generation processing. In particular, in the present embodiment, processing for moving the illumination source object (moving object) in the object space is performed based on operation data input by the player through the operation unit 160.

  The virtual camera control unit 114 performs a virtual camera (viewpoint) control process for generating an image viewed from a given (arbitrary) viewpoint in the object space. Specifically, processing for controlling the position (X, Y, Z) or rotation angle (rotation angle about the X, Y, Z axis) of the virtual camera (processing for controlling the viewpoint position, the line-of-sight direction or the angle of view) I do.

  For example, when an object (eg, character, ball, car) is photographed from behind using a virtual camera, the position or rotation angle of the virtual camera (the direction of the virtual camera is set so that the virtual camera follows changes in the position or rotation of the object. ) To control. In this case, the virtual camera can be controlled based on information such as the position, rotation angle, or speed of the object obtained by the movement / motion processing unit 112. Alternatively, the virtual camera may be controlled to rotate at a predetermined rotation angle or to move along a predetermined movement path. In this case, the virtual camera is controlled based on the virtual camera data for specifying the position (movement path) or rotation angle of the virtual camera. When there are a plurality of virtual cameras (viewpoints), the above control process is performed for each virtual camera.

  The drawing unit 120 performs drawing processing based on the results of various processing (game processing) performed by the processing unit 100, thereby generating an image and outputting the image to the display unit 190. When generating a so-called three-dimensional game image, first, object data (model data) including vertex data (vertex position coordinates, texture coordinates, color data, normal vector, α value, etc.) of each vertex of the object (model) ) Is input, and vertex processing (shading by a vertex shader) is performed based on the vertex data included in the input object data. When performing the vertex processing, vertex generation processing (tessellation, curved surface division, polygon division) for re-dividing the polygon may be performed as necessary. In the vertex processing, according to the vertex processing program (vertex shader program, first shader program), vertex movement processing, coordinate conversion (world coordinate conversion, camera coordinate conversion), clipping processing, perspective processing, and other geometric processing are performed. On the basis of the processing result, the vertex data given to the vertex group constituting the object is changed (updated or adjusted). Then, rasterization (scan conversion) is performed based on the vertex data after the vertex processing, and the surface of the polygon (primitive) is associated with the pixel. Subsequent to rasterization, pixel processing (shading or fragment processing by a pixel shader) for drawing pixels (fragments forming a display screen) constituting an image is performed. In pixel processing, according to a pixel processing program (pixel shader program, second shader program), various processes such as texture reading (texture mapping), color data setting / change, translucent composition, anti-aliasing, etc. are performed, and an image is processed. The final drawing color of the constituent pixels is determined, and the drawing color of the perspective-transformed object is output (drawn) to the drawing buffer 174 (a buffer capable of storing image information in units of pixels; VRAM, rendering target). That is, in pixel processing, per-pixel processing for setting or changing image information (color, normal, luminance, α value, etc.) in units of pixels is performed. Thereby, an image that can be seen from the virtual camera (given viewpoint) in the object space is generated. Note that when there are a plurality of virtual cameras (viewpoints), an image can be generated so that an image seen from each virtual camera can be displayed as a divided image on one screen.

  The vertex processing and pixel processing are realized by hardware that enables polygon (primitive) drawing processing to be programmed by a shader program written in a shading language, so-called programmable shaders (vertex shaders and pixel shaders). Programmable shaders can be programmed with vertex-level processing and pixel-level processing, so that the degree of freedom of drawing processing is high, and expressive power is greatly improved compared to conventional hardware-based fixed drawing processing. Can do.

  The drawing unit 120 performs geometry processing, texture mapping, hidden surface removal processing, α blending, and the like when drawing an object.

  In the geometry processing, processing such as coordinate conversion, clipping processing, perspective projection conversion, or light source calculation is performed on the object. Then, object data (positional coordinates of object vertices, texture coordinates, color data (luminance data), normal vector, α value, etc.) after geometry processing (after perspective projection conversion) is stored in the main storage unit 172. The

  Texture mapping is a process for mapping a texture (texel value) stored in the texture storage unit 178 of the storage unit 170 to an object. Specifically, the texture (surface properties such as color (RGB) and α value) is read from the texture storage unit 178 of the storage unit 170 using the texture coordinates set (given) at the vertex of the object. Then, a texture that is a two-dimensional image is mapped to an object. In this case, processing for associating pixels with texels, bilinear interpolation or the like is performed as texel interpolation.

  As the hidden surface removal processing, hidden surface removal processing can be performed by a Z buffer method (depth comparison method, Z test) using a Z buffer (depth buffer) in which Z values (depth information) of drawing pixels are stored. . That is, when drawing pixels corresponding to the primitive of the object are drawn, the Z value stored in the Z buffer is referred to. Then, the Z value of the referenced Z buffer is compared with the Z value at the drawing pixel of the primitive, and the Z value at the drawing pixel is a Z value (for example, a small Z value) on the near side when viewed from the virtual camera. In some cases, the drawing process of the drawing pixel is performed and the Z value of the Z buffer is updated to a new Z value.

  α blending (α synthesis) is a translucent synthesis process (usually α blending, addition α blending, subtraction α blending, or the like) based on an α value (A value).

  The α value is information that can be stored in association with each pixel (texel, dot), for example, plus alpha information other than color information. The α value can be used as mask information, translucency (equivalent to transparency and opacity), bump information, and the like.

  Further, in the present embodiment, the drawing unit 120 includes a texture coordinate calculation unit 122, an illuminated area setting unit 124, and an illumination processing unit 126.

  The texture coordinate calculation unit 122 uses a projection matrix representing the spread of illumination light from the projection center (camera center, representative point, reference point) set for the illumination source object (moving object moving in the object space). The texture coordinates for the illumination pattern texture corresponding to the vertex coordinates included in the object data of the illumination target object are calculated by the conversion matrix obtained in this way. Specifically, a world matrix (first matrix), a view matrix (second matrix), a projection matrix (third matrix), and a correction matrix for shifting the coordinate center and normalizing the range ( A process of multiplying the conversion matrix comprising the fourth matrix) and the vertex coordinates is performed to convert the vertex coordinates into texture coordinates. As a result, texture coordinates corresponding to the relative positional relationship between the illumination source object and the illumination target object are obtained.

  The illuminated area setting unit 124 performs processing for setting an illuminated area for the illumination target object by texture mapping the illumination pattern texture to the illumination target object based on the texture coordinates obtained by the texture coordinate calculation unit 122. Do. Specifically, the texture storage unit 176 stores an illumination pattern texture in which the value of the texel (luminance value) is changed according to the illumination pattern of the illumination light emitted from the illumination source object, and the texture coordinates are stored in the texture coordinates. By associating the texel data (parameters) sampled based on the illumination target object, the illumination target area corresponding to the illumination pattern is set in the illumination target object.

  The illumination processing unit 126 performs an illumination process for reflecting the illumination light from the illumination source object on the illumination target object based on the setting information of the illuminated area. Specifically, an illumination process is performed in which the color obtained based on the object data of the illumination target object is changed to a dark color according to the influence degree parameter for an area other than the illuminated area set for the illumination target object.

  The influence degree parameter is a parameter representing the influence degree of the illumination light received from the illumination source object, and is associated with the vertex constituting the illumination target object in the object data of the illumination target object stored in the object data storage unit 176. Parameter. The influence parameter can be set by an α value (A value). For example, the influence parameter may be directly associated with each vertex as a vertex α value, or sampled from texture coordinates associated with the vertex. It may be indirectly associated with the texel α value of the decal texture (pattern texture). Further, the influence parameter may be obtained from a multiplication result of the vertex α value directly associated with the vertex and the α value set in the texel of the decal texture.

  Further, in the object data storage unit 176, a color reflecting illumination light received from the illumination source object is associated with each vertex of the plurality of vertices constituting the illumination target object in the object data of the illumination target object. This “color reflecting illumination light” may be directly associated with each vertex as a vertex color (diffuse), for example, or a decal texture (pattern texture) sampled from the texture coordinates associated with the vertex. ) May be indirectly associated with the color of the texel. Further, the “color reflecting illumination light” may be obtained from the result of multiplication of the vertex color directly associated with the vertex and the color set in the texel of the decal texture.

  The illumination target object has a first area that receives illumination light from another illumination source (for example, a streetlight) different from the illumination source object, and a second area that does not receive illumination light from another illumination source. In the object data of the object to be illuminated stored in the object data storage unit 176, the illumination light received from the illumination source object and other illumination sources with respect to the vertex constituting the first area are included. A color reflecting the illumination light to be received is associated, and a color reflecting the illumination light from the illumination source object can be associated with a vertex constituting the second region. Particularly in such a case, in the object data of the illumination target object, the influence of the illumination light from the illumination source object is greater on the vertices constituting the second area than on the vertices constituting the first area. Thus, it is preferable that the influence degree parameters are associated with each other.

  In the illumination process, the color obtained based on the object data of the illumination target object for the illuminated area may be changed to a bright color according to the influence parameter, or for both the illuminated area and other areas. You may make it adjust the color obtained based on the object data of a lighting target object according to an influence parameter.

  The sound generation unit 130 performs sound processing based on the results of various processes performed by the processing unit 100, generates game sounds such as BGM, sound effects, or sounds, and outputs the game sounds to the sound output unit 192.

  Note that the image generation system of the present embodiment may be a system dedicated to the single player mode in which only one player can play, or may be a system having a multiplayer mode in which a plurality of players can play. Further, when a plurality of players play, game images and game sounds to be provided to the plurality of players may be generated using one terminal, or connected via a network (transmission line, communication line) or the like. Alternatively, it may be generated by distributed processing using a plurality of terminals (game machine, mobile phone).

2. 2. Technique of this Embodiment 2.1 Illuminated Area Setting Technique In this embodiment, as shown in FIG. 2, a train vehicle object OB1 (illumination source object, moving object) that serves as an illumination source that moves in the object space ) To be illuminated according to the movement of the vehicle object OB1 by projecting and mapping the texture TEX (illumination pattern texture) obtained by textured the illumination pattern on the course object OB2 (illumination target object) of the track that receives illumination light from Is used for the course object OB2.

  Specifically, first, as shown in FIG. 3, a texture TEX (illumination pattern texture) is prepared in which a pattern in which texel values continuously change from the inside toward the outside according to the brightness of the illumination is set as the illumination pattern. . In this texture TEX, an illumination area and a non-illumination area are set, and an illumination brightness parameter L is set in the texel according to each area. As shown in FIG. 4, the brightness parameter L is set to L = 1 in the illumination area where the illumination light is strong, and is continuously set in the range of 0 <L <1 in the area R2 from the inside toward the outside. Thus, the brightness parameter L is set to change. In the non-illuminated area, the brightness parameter L is set to zero. The brightness parameter L can be set as the luminance value of each color component of the RGB components of the texel or the α value of the texel, and may be set differently from the setting of the texel as described above.

  Then, the texture TEX is projected from a virtual camera VC2 (second virtual camera) whose projection center is a predetermined position of a vehicle object OB1 that imitates a train serving as an illumination source as shown in FIG. The texture coordinates are obtained so that the positions of the vertices and the positions of the vertices of the course object OB2 imitating Further, in the method of the present embodiment, the virtual camera VC2 is installed in the front downward direction of the vehicle object OB1, and the illumination light from the projection center of the virtual camera VC2 is spread and irradiated toward the course object OB2. is doing. That is, the coordinates of the vertices (the vertices V1 to V5 in the example of FIG. 5) in which the texture mapping target area of the texture TEX exists within the angle of view of the virtual camera VC2 are converted into texture coordinates. In this way, in the present embodiment, the brightness parameter L set as the illumination pattern in the texture TEX is associated with the vertex of the course object OB2, so that the brightness parameter L for a part of the course object OB2 is 0 < L ≦ 1 is set, and the area is set as an illuminated area that receives illumination light from the vehicle object OB1. Note that the virtual camera VC1 (first virtual camera) in FIG. 5 is a camera for photographing a scene in the object space to be rendered (perspectively projecting an object in the view volume onto the screen).

  Here, in the present embodiment, as a method for obtaining the texture coordinates for the texture TEX, a method of converting the vertex coordinates into the texture coordinates using a predetermined conversion matrix is adopted. For example, the world matrix W for converting the coordinate value of each vertex included in the object data of the course object OB2 from the coordinate value of the local coordinate system (model coordinate system) to the coordinate value of the world coordinate system, and the projection center of the virtual camera VC1. A view matrix V that performs conversion to a view coordinate system (viewpoint coordinate system) that is the origin, and a projection that represents the spread of illumination light from the projection center of the illumination source (the enlargement ratio of the texture image according to the distance from the projection center) Matrix elements for shifting the center (origin) of the coordinate system of the texture coordinate obtained by the matrix P and each matrix W, V, P and normalizing the range (normalizing −1 to 1 to 0 to 1) Are prepared, and the vertex coordinates of the course object OB2 are converted into texture coordinates based on these matrices. It can be obtained in the transformation matrix m.

  Here, the projection matrix P can be changed according to the illumination pattern set in the texture TEX. For example, when a plurality of object data is prepared as the vehicle object OB1, different textures TEX are associated with each object, and the conversion matrix m is calculated using the projection matrix P corresponding to the associated texture TEX. Obtainable. In this case, each matrix element is set so that the angle of view and the like are different from each other in each projection matrix P. In this way, the illumination pattern for each vehicle is prepared with the texture TEX, and the illumination spread for each vehicle is prepared with the projection matrix P, so that an image with a different appearance of illuminating the background or the like is generated for each vehicle. be able to. In addition, when an event occurs in which a part of the light breaks down while the vehicle object OB1 is moving on the course object OB2, a texture TEX in which an illumination pattern after the failure is set is prepared and mapped. The target texture TEX may be switched. In this way, an illuminated area corresponding to the type of event that has occurred can be set for the course object OB2.

  Only the texture TEX may be changed according to the type of the object, only the projection matrix P may be changed according to the type of the object, or the texture TEX and the projection may be changed according to the type of the object. Both of the matrix P may be changed. Further, only the texture TEX may be changed according to the event type, only the projection matrix P may be changed according to the event type, or the texture TEX and the projection may be changed according to the event type. Both of the matrix P may be changed. When the texture TEX and the projection matrix P are changed according to the object type and the event type, the individual texture TEX and the individual projection matrix P are associated with a plurality of types of objects and a plurality of types of events. Alternatively, a common texture TEX or a common projection matrix P may be associated with a plurality of types of objects or a part of a plurality of types of events. A plurality of types of objects and a plurality of types of events may be grouped, and a texture TEX and a projection matrix P may be associated with each group.

  In the above method, the case has been described in which the virtual camera VC2 is installed in advance at the projection center in the vehicle object OB1 with the front facing downward, but the present invention is not limited to this. For example, as shown in FIG. 6, the virtual camera VC2 may be installed so as to face the front of the vehicle object OB1, and the illumination light may be spread and irradiated from the projection center of the virtual camera VC2. . In this case, the distance Dth may be set as a threshold parameter in order to express a state in which the illumination light illuminates a certain distance range according to the distance D from the projection center of the virtual camera VC2. In this case, the texture mapping target area of the texture TEX is within the angle of view of the virtual camera VC2 and the vertex D exists in the range of the distance D from the projection center of the virtual camera VC2 (vertex V2 in the example of FIG. 5). The coordinates of V5) are converted into texture coordinates.

  Further, not only when vertices within the distance Dth from the projection center of the virtual camera VC2 are used as vertices to be mapped by the texture TEX, for example, all vertices existing within the angle of view of the virtual camera VC2 are displayed. A certain distance range is obtained by correcting the brightness parameter L set in the texel of the texture TEX associated with each vertex according to the distance D from the projection center of the virtual camera VC2 as a vertex to be mapped. A state in which the illumination light reaches only in a range where the corrected brightness parameter L ′ satisfies 0 <L ′ ≦ 1 may be expressed.

2.2 Method of Illumination Processing In this embodiment, the degree of influence on the illumination from the vehicle object OB1 is set in the object data of the illumination target course object OB2 that receives illumination from the vehicle object OB1 moving in the object space. A method of illumination processing is adopted in which the color of the course object OB2 is adjusted according to the influence degree set in advance in the object data.

  Specifically, the following settings are made at the construction stage of the object data of the course object OB2. First, as shown in FIG. 7, assuming that the entire area of the course object OB2 is illuminated by the illumination from the vehicle object OB1, the color reflecting the color of the illumination light of the vehicle object OB1 is the color of each vertex. Set as.

  Next, as shown in FIG. 8, assuming that no illumination is received from the vehicle object OB1, the original color of the course object OB2 is set as the color of each vertex. In FIG. 8, the color reflecting the illumination light of the street lamp is set as the vertex color for the area that has been previously illuminated by the street lamp as an illumination source other than the vehicle object OB1. Further, in FIG. 8, the degree of influence is different so that the degree of influence on the illumination light of the vehicle object OB1 differs between the area that has been previously illuminated with the streetlight (originally bright area) and the area that has not been illuminated with the streetlight (originally dark place). The parameter is set. This influence parameter is set so that the influence is smaller in the area receiving the streetlight than in the area not receiving the streetlight. That is, the influence parameter is set such that a dark place is easily affected by illumination and a bright place is hardly affected by illumination. This influence parameter is set as the α value (A value) of the vertex.

  Finally, the color when the illumination light is received from the vehicle object OB1 set as shown in FIG. 7 and the illumination light from the vehicle object OB1 set as shown in FIG. 8 are not received. The color of each vertex of the course object OB2 is determined according to the color and the degree of influence of the vehicle object OB1 on the illumination light determined according to the brightness of the original color of the course object OB2, and as shown in FIG. Object data is constructed with the color obtained by blending the color when receiving illumination light from the object OB1 and the color when not receiving illumination light from the vehicle object OB1 as the color of each vertex.

  In this embodiment, using the color set in advance for the vertex as described above, the illumination process when the illumination from the vehicle object OB1 is received is performed as follows.

  First, consider a case where the influence of illumination light using the vehicle object OB1 as an illumination source is set as shown in FIG. 10 in each region of the course object OB2 through which the vehicle object OB1 passes. In FIG. 10, a partial area S1 (first area) of the course object OB2 is set as an area that receives illumination from another illumination source (streetlight) in advance, and the other area S2 (second area) ), The influence parameter A is set to A = A1 (for example, 0 << A1 ≦ 1). Here, A1 is set as a value indicating that the influence of the illumination light from the vehicle object OB1 is large. In the area S1 receiving illumination from another illumination source, the influence parameter A is A = A2 (for example, 0 ≦ A2) on the inner side, considering that the influence of the lighting by the street lamp decreases from the inner side to the outer side. << 1), and the influence parameter A is set so as to continuously change from A2 to A1 from the inside to the outside. Here, A2 is set as a value indicating that the influence of the illumination light from the vehicle object OB1 is small.

  In such a situation, the vehicle object OB1 moves on the course object OB2 as shown in FIG. 11 while illuminating the course object OB2 with illumination light, and the illuminated area S0 is set according to the movement of the vehicle object OB1. In the illuminated area S0, the texture designation TEX is set on the basis of the brightness parameter L associated with the texel of the texture TEX by projecting and mapping the texture TEX onto the course object OB2 by the method described above. The illuminated area and other areas are defined by the area designation parameter LT. As the region designation parameter LT, LT = 1-L is set for a region where the texture TEX is projected and mapped, and LT = 1 is fixedly set for other regions. That is, in the illuminated area S0, LT = 0 in the area where the illumination light of the vehicle object OB1 is strongly irradiated, and LT is 0 <LT toward the area where the illumination is not illuminated (area where LT = 1). It changes continuously in the range of <1.

  Thus, when drawing the course object OB2 in which the illuminated area S0 and other areas are set, the color RGB (m) obtained based on the object data is adjusted by the following adjustment formula (1). The color RGB (o) of the course object OB2 is set. By performing such adjustment, for example, a view field image that can be seen from the virtual camera VC1 as shown in FIG. 12 is generated. The “color RGB (m) obtained based on the object data” may be the vertex color of the object, the texel color of the decal texture mapped to the object, or the vertex color and the decal. The result may be a multiplication result of the texture texel color.

RGB (o) = RGB (m) * (A * (1-LT) + (1-A)) (1)
Specifically, the areas S0 to S2 are adjusted to the following colors.

  First, for the area of LT = 0 in the illuminated area S0 shown in FIG. 11 (area where the illumination light from OB1 is strongly irradiated), RGB (o) = RGB (m), which is based on the object data of the course object OB2. The obtained color is set as a color for drawing the area.

  Further, for the region of 0 <LT <1 in the illuminated region S0 shown in FIG. 11 (region where the illumination light from OB1 gradually attenuates), RGB (o) = RGB (m) * (1-A * LT), and the color obtained based on the object data of the course object OB2 is an area designation parameter LT set by the projection mapping of the influence parameter A (α value) set for each vertex of the course object OB2 and the texture TEX. A darkened color (a color with reduced brightness) is set as a color for drawing the area in accordance with a multiplication value of (= 1−L).

  Further, among the regions S1 and S2 shown in FIG. 11, the region of LT = 1 (the region other than the illuminated region S0, the region not receiving illumination light from OB1) is RGB (o) = RGB (m) *. (1-A), and the color obtained based on the object data of the course object OB2 is darkened according to the influence parameter A (α value) set for each vertex of the course object OB2 (the brightness is lowered) Color) is set as a color for drawing the area.

3. Processing of this Embodiment Next, a detailed processing example of this embodiment will be described with reference to the flowchart of FIG.

  First, the position of the vehicle object OB1 is calculated (step S10). Thereby, the position of the projection center of the virtual camera VC2 set to the vehicle object OB1 is determined.

  Next, a conversion matrix m for projection mapping is calculated using the projection matrix P corresponding to the type of vehicle object (step S11). Then, the object data of the course object OB2 that is the target of projection mapping is read (step S12). This object data includes vertex coordinates, vertex colors, vertex α values, decal texture texture coordinates, and the like. As the vertex color, a color reflecting illumination light from the vehicle object OB1 is set. In the vertex α value, an influence parameter for illumination light from the vehicle object OB1 is set. In the example of the above embodiment, the decal texture is an image representing rails of railroad tracks or sleepers.

  Next, the vertex coordinates obtained from the object data of the course object OB2 are converted into texture coordinates for projection mapping using the conversion matrix m obtained in step S11 (step S13). Note that the matrix conversion performed in step S13 is performed by a vertex shader (vertex processing unit) of the drawing processor. The matrix conversion performed in step S13 may be performed by a pixel shader (pixel processing unit) of the drawing processor.

  Subsequently, the texture data (texel value) is sampled based on the texture coordinates, and the texture TEX in which the illumination pattern is set on the course object OB2 is projected and mapped to set the illuminated area (step S14).

  And each area (illuminated area and other areas) of the course object OB2 according to the area designation parameter (LT = 1-L) which is the setting information of the illuminated area and the influence parameter (A) obtained from the object data Is determined (step S15). For example, for the illuminated area, the color obtained based on the object data of the course object OB2 is set as it is as the color for drawing the area as it is or by reducing the color according to the area designation parameter. Is reduced according to the influence parameter and set as a color for drawing the area. The sampling of texture data performed in step S14 and the drawing color of the object performed in step S15 are performed by a pixel shader (pixel processing unit) of the rendering processor.

  Finally, the course object OB2 is drawn based on the obtained color data (luminance value data of each color component of RGB) and position data (coordinate data) (step S16).

4). Hardware Configuration FIG. 14 shows an example of a hardware configuration capable of realizing this embodiment. The main processor 900 operates based on a program stored in a DVD 982 (information storage medium, which may be a CD), a program downloaded via the communication interface 990, a program stored in the ROM 950, or the like. Perform processing, sound processing, etc. The coprocessor 902 assists the processing of the main processor 900, and executes matrix operation (vector operation) at high speed. For example, when a matrix calculation process is required for a physical simulation for moving or moving an object, a program operating on the main processor 900 instructs (requests) the process to the coprocessor 902.

  The geometry processor 904 performs geometry processing such as coordinate conversion, perspective conversion, light source calculation, and curved surface generation based on an instruction from a program operating on the main processor 900, and executes matrix calculation at high speed. The data decompression processor 906 performs decoding processing of compressed image data and sound data, and accelerates the decoding processing of the main processor 900. Thereby, a moving image compressed by the MPEG method or the like can be displayed on the opening screen or the game screen.

  The drawing processor 910 executes drawing (rendering) processing of an object composed of primitive surfaces such as polygons and curved surfaces. When drawing an object, the main processor 900 uses the DMA controller 970 to pass the drawing data to the drawing processor 910 and, if necessary, transfers the texture to the texture storage unit 924. Then, the drawing processor 910 draws the object in the frame buffer 922 while performing hidden surface removal using a Z buffer or the like based on the drawing data and texture. The drawing processor 910 also performs α blending (translucent processing), depth cueing, mip mapping, fog processing, bilinear filtering, trilinear filtering, anti-aliasing, shading processing, and the like. When a programmable shader such as a vertex shader or a pixel shader is installed, the vertex data is created / changed (updated) and the drawing color of a pixel (or fragment) is determined according to the shader program. When an image for one frame is written in the frame buffer 922, the image is displayed on the display 912.

  The sound processor 930 includes a multi-channel ADPCM sound source and the like, generates game sounds such as BGM, sound effects, and sounds, and outputs them through the speaker 932. Data from the game controller 942 and the memory card 944 is input via the serial interface 940.

  The ROM 950 stores system programs and the like. In the case of an arcade game system, the ROM 950 functions as an information storage medium, and various programs are stored in the ROM 950. A hard disk may be used instead of the ROM 950. The RAM 960 is a work area for various processors. The DMA controller 970 controls DMA transfer between the processor and the memory. The DVD drive 980 (may be a CD drive) accesses a DVD 982 (may be a CD) in which programs, image data, sound data, and the like are stored. The communication interface 990 performs data transfer with the outside via a network (communication line, high-speed serial bus).

  The processing of each unit (each unit) in this embodiment may be realized entirely by hardware, or may be realized by a program stored in an information storage medium or a program distributed via a communication interface. Also good. Alternatively, it may be realized by both hardware and a program.

  When the processing of each part of this embodiment is realized by both hardware and a program, a program for causing the hardware (computer) to function as each part of this embodiment is stored in the information storage medium. More specifically, the program instructs the processors 902, 904, 906, 910, and 930, which are hardware, and passes data if necessary. Each processor 902, 904, 906, 910, 930 realizes the processing of each unit of the present invention based on the instruction and the passed data.

  The present invention is not limited to that described in the above embodiment, and various modifications can be made. For example, terms cited as broad or synonymous terms in the description in the specification or drawings can be replaced with broad or synonymous terms in other descriptions in the specification or drawings. Further, the method of expressing the contact trace is not limited to that described in the present embodiment, and a method equivalent to these is also included in the scope of the present invention.

  Moreover, although the example which reflects the illumination light from a moving illumination source on a course object was demonstrated in the said embodiment, you may make it perform the same illumination process with respect to background objects other than a course object, for example. The illumination target object is not limited to a fixed object that is fixedly arranged in the object space, and may be a moving object that moves in the object space.

  Further, in the above embodiment, a bright color when the illumination from the moving illumination source is received in the object data of the course object is set in advance, and the area other than the illuminated area is colored according to the influence degree set in advance in the object data. Although the lighting processing method was used to darken the object, the dark object color was set in advance in the object data of the course object, and the illuminated area was preset in the object data. The color may be brightened according to the degree of influence. In addition, in the object data of the course object, an intermediate brightness color between a bright color when receiving illumination from a moving illumination source and a dark color when not receiving the illumination is set in advance. The color may be adjusted to lighten according to the degree of influence set in advance in the object data, and the area other than the illuminated area may be adjusted to darken according to the influence set in advance in the object data.

  Further, in the above embodiment, the case where the train vehicle light illuminates the track has been described as an example. However, the method of this embodiment can be applied to the case where the car light illuminates a road or another vehicle, or the pocket that the player character is equipped with. It can also be applied when the background is illuminated by electric lights or torches. In addition, when the background or the like is illuminated in advance by another illumination source such as a streetlight, the other illumination source may be moved in the object space. Processing in which the degree parameter is dynamically obtained may be performed. For example, when expressing illumination by a car light, the conversion matrix m may be obtained so that the direction (line-of-sight direction) of the virtual camera VC2 for projection mapping changes depending on the low beam and the high beam.

  The present invention can be applied to various games (racing game, fighting game, shooting game, robot battle game, sports game, competition game, role playing game, music playing game, dance game, etc.). Further, the present invention is applied to various image generation systems such as a business game system, a home game system, a large attraction system in which a large number of players participate, a simulator, a multimedia terminal, a system board for generating a game image, and a mobile phone. it can.

The functional block diagram of the image generation system of this embodiment. The figure for demonstrating the method of this embodiment. A texture image used in the method of this embodiment. Explanatory drawing of the texture image used with the method of this embodiment. The figure for demonstrating the method of this embodiment. The figure for demonstrating the method of this embodiment. Explanatory drawing of the object data used with the method of this embodiment. Explanatory drawing of the object data used with the method of this embodiment. Explanatory drawing of the object data used with the method of this embodiment. The figure for demonstrating the method of this embodiment. The figure for demonstrating the method of this embodiment. The image drawn using the method of this embodiment. The flowchart which shows the example of the process of this embodiment. An example of a hardware configuration.

Explanation of symbols

OB1 vehicle object (light source object, moving object),
OB2 Course object (lighting object),
100 processing unit, 110 object space setting unit, 112 movement / motion processing unit,
114 virtual camera control unit, 120 drawing unit, 122 texture coordinate calculation unit,
124 Illumination processing unit, 160 operation unit, 170 storage unit, 172 main storage unit,
174 Drawing buffer, 176 Object data storage unit,
178 texture storage unit, 180 information storage medium, 190 display unit,
192 sound output unit, 194 portable information storage device, 196 communication unit,

Claims (13)

A program for generating an image of an object space viewed from a given viewpoint,
An object data storage unit that stores object data of a moving object that is an illumination source that moves in the object space, and object data of an illumination target object that receives illumination from the moving object;
An object space setting unit for setting the moving object and the illumination target object with respect to the object space;
A texture storage unit for storing an illumination pattern texture in which an illumination pattern of illumination light emitted from the moving object is set;
Using a projection matrix that represents the spread of the illumination light from the projection center set for the moving object, texture coordinates for the illumination pattern texture corresponding to vertex coordinates included in the object data of the illumination target object are obtained. A texture coordinate calculation unit to be calculated;
Based on the obtained texture coordinates, the illumination pattern texture is texture-mapped to the illumination target object, and an illuminated area setting unit that sets an illumination area for the illumination target object;
As an illumination processing unit that performs illumination processing that reflects the illumination light on the illumination target object based on the setting information of the illuminated area,
Make the computer work,
The object data storage unit
Stores object data of multiple types of mobile objects,
The object space setting unit
One or more types of the plurality of types of moving objects are set in the object space,
The texture coordinate calculation unit is
The texture coordinates are calculated using a different projection matrix depending on the type of the moving object,
The illuminated area setting unit includes:
A program for setting an illuminated area corresponding to a type of the moving object for the illumination target object based on the obtained texture coordinates. A program for generating an image of an object space viewed from a given viewpoint,
An object data storage unit that stores object data of a moving object that is an illumination source that moves in the object space, and object data of an illumination target object that receives illumination from the moving object;
An object space setting unit for setting the moving object and the illumination target object with respect to the object space;
A texture storage unit for storing an illumination pattern texture in which an illumination pattern of illumination light emitted from the moving object is set;
Using a projection matrix that represents the spread of the illumination light from the projection center set for the moving object, texture coordinates for the illumination pattern texture corresponding to vertex coordinates included in the object data of the illumination target object are obtained. A texture coordinate calculation unit to be calculated;
Based on the obtained texture coordinates, the illumination pattern texture is texture-mapped to the illumination target object, and an illuminated area setting unit that sets an illumination area for the illumination target object;
As an illumination processing unit that performs illumination processing that reflects the illumination light on the illumination target object based on the setting information of the illuminated area,
Make the computer work,
The texture coordinate calculation unit is
Calculating the texture coordinates using different projection matrices depending on the type of event occurring in the object space;
The illuminated area setting unit includes:
A program for setting an illuminated area corresponding to the type of event for the illumination target object based on the obtained texture coordinates. A program for generating an image of an object space viewed from a given viewpoint,
An object data storage unit that stores object data of a moving object that is an illumination source that moves in the object space, and object data of an illumination target object that receives illumination from the moving object;
An object space setting unit for setting the moving object and the illumination target object with respect to the object space;
A texture storage unit for storing an illumination pattern texture in which an illumination pattern of illumination light emitted from the moving object is set;
An illuminated area setting unit configured to texture-map the illumination pattern texture to an illumination target object and set an illuminated area for the illumination target object;
As an illumination processing unit that performs illumination processing that reflects the illumination light on the illumination target object based on the setting information of the illuminated area,
Make the computer work,
The object data storage unit
Stores object data of multiple types of mobile objects,
The object space setting unit
One or more types of the plurality of types of moving objects are set in the object space,
The texture storage unit
Storing a plurality of different illumination pattern textures depending on the type of the moving object,
The illuminated area setting unit includes:
A program characterized in that an illumination pattern texture corresponding to the type of the moving object is texture-mapped to the object to be illuminated and an illuminated area corresponding to the type of the moving object is set. A program for generating an image of an object space viewed from a given viewpoint,
An object data storage unit that stores object data of a moving object that is an illumination source that moves in the object space, and object data of an illumination target object that receives illumination from the moving object;
An object space setting unit for setting the moving object and the illumination target object with respect to the object space;
A texture storage unit for storing an illumination pattern texture in which an illumination pattern of illumination light emitted from the moving object is set;
An illuminated area setting unit configured to texture-map the illumination pattern texture to an illumination target object and set an illuminated area for the illumination target object;
As an illumination processing unit that performs illumination processing that reflects the illumination light on the illumination target object based on the setting information of the illuminated area,
Make the computer work,
The texture storage unit
Storing a plurality of different illumination pattern textures depending on the type of event occurring in the object space;
The illuminated area setting unit includes:
A program characterized in that an illumination pattern texture corresponding to the type of event is texture-mapped to the illumination target object, and an illuminated area corresponding to the event type is set for the illumination target object. A program for generating an image of an object space viewed from a given viewpoint,
An object data storage unit that stores object data of a moving object that is an illumination source that moves in the object space, and object data of an illumination target object that receives illumination from the moving object;
An object space setting unit for setting the moving object and the illumination target object with respect to the object space;
A texture storage unit for storing an illumination pattern texture in which an illumination pattern of illumination light emitted from the moving object is set;
An illuminated area setting unit configured to texture-map the illumination pattern texture to an illumination target object and set an illuminated area for the illumination target object;
As an illumination processing unit that performs illumination processing that reflects the illumination light on the illumination target object based on the setting information of the illuminated area,
Make the computer work,
The illumination processing unit
A process of adjusting a color obtained based on object data of the illumination target object is performed as an illumination process based on an influence parameter with respect to the illumination light set in advance with respect to the vertex constituting the illumination target object. Program. In any one of Claims 3-5,
Using a projection matrix that represents the spread of the illumination light from the projection center set for the moving object, texture coordinates for the illumination pattern texture corresponding to vertex coordinates included in the object data of the illumination target object are obtained. As a texture coordinate calculation unit to calculate, let the computer further function,
The illuminated area setting unit includes:
A program characterized in that, based on the obtained texture coordinates, the illumination pattern texture is texture-mapped to an illumination target object, and an illuminated area is set for the illumination target object. An information storage medium readable by a computer, wherein the program according to any one of claims 1 to 6 is stored. An image generation system for generating an image of an object space viewed from a given viewpoint,
An object data storage unit that stores object data of a moving object that is an illumination source that moves in the object space, and object data of an illumination target object that receives illumination from the moving object;
An object space setting unit for setting the moving object and the illumination target object with respect to the object space;
A texture storage unit for storing an illumination pattern texture in which an illumination pattern of illumination light emitted from the moving object is set;
Using a projection matrix that represents the spread of the illumination light from the projection center set for the moving object, texture coordinates for the illumination pattern texture corresponding to vertex coordinates included in the object data of the illumination target object are obtained. A texture coordinate calculation unit to be calculated;
Based on the obtained texture coordinates, the illumination pattern texture is texture-mapped to the illumination target object, and an illuminated area setting unit that sets an illumination area for the illumination target object;
An illumination processing unit that performs illumination processing for reflecting the illumination light on the illumination target object based on the setting information of the illuminated area, and
The object data storage unit
Stores object data of multiple types of mobile objects,
The object space setting unit
One or more types of the plurality of types of moving objects are set in the object space,
The texture coordinate calculation unit is
The texture coordinates are calculated using a different projection matrix depending on the type of the moving object,
The illuminated area setting unit includes:
An image generation system, wherein an illuminated area corresponding to a type of the moving object is set for the illumination target object based on the obtained texture coordinates. An image generation system for generating an image of an object space viewed from a given viewpoint,
An object data storage unit that stores object data of a moving object that is an illumination source that moves in the object space, and object data of an illumination target object that receives illumination from the moving object;
An object space setting unit for setting the moving object and the illumination target object with respect to the object space;
A texture storage unit for storing an illumination pattern texture in which an illumination pattern of illumination light emitted from the moving object is set;
Using a projection matrix that represents the spread of the illumination light from the projection center set for the moving object, texture coordinates for the illumination pattern texture corresponding to vertex coordinates included in the object data of the illumination target object are obtained. A texture coordinate calculation unit to be calculated;
Based on the obtained texture coordinates, the illumination pattern texture is texture-mapped to the illumination target object, and an illuminated area setting unit that sets an illumination area for the illumination target object;
An illumination processing unit that performs illumination processing for reflecting the illumination light on the illumination target object based on the setting information of the illuminated area, and
The texture coordinate calculation unit is
Calculating the texture coordinates using different projection matrices depending on the type of event occurring in the object space;
The illuminated area setting unit includes:
An image generation system, wherein an illuminated region corresponding to the type of event is set for the illumination target object based on the obtained texture coordinates. An image generation system for generating an image of an object space viewed from a given viewpoint,
An object data storage unit that stores object data of a moving object that is an illumination source that moves in the object space, and object data of an illumination target object that receives illumination from the moving object;
An object space setting unit for setting the moving object and the illumination target object with respect to the object space;
A texture storage unit for storing an illumination pattern texture in which an illumination pattern of illumination light emitted from the moving object is set;
An illuminated area setting unit configured to texture-map the illumination pattern texture to an illumination target object and set an illuminated area for the illumination target object;
An illumination processing unit that performs illumination processing for reflecting the illumination light on the illumination target object based on the setting information of the illuminated area, and
The object data storage unit
Stores object data of multiple types of mobile objects,
The object space setting unit
One or more types of the plurality of types of moving objects are set in the object space,
The texture storage unit
Storing a plurality of different illumination pattern textures depending on the type of the moving object,
The illuminated area setting unit includes:
An image generation system characterized in that an illumination pattern texture corresponding to a type of the moving object is texture-mapped to the object to be illuminated, and an illuminated area corresponding to the type of the moving object is set. An image generation system for generating an image of an object space viewed from a given viewpoint,
An object data storage unit that stores object data of a moving object that is an illumination source that moves in the object space, and object data of an illumination target object that receives illumination from the moving object;
An object space setting unit for setting the moving object and the illumination target object with respect to the object space;
A texture storage unit for storing an illumination pattern texture in which an illumination pattern of illumination light emitted from the moving object is set;
An illuminated area setting unit configured to texture-map the illumination pattern texture to an illumination target object and set an illuminated area for the illumination target object;
An illumination processing unit that performs illumination processing for reflecting the illumination light on the illumination target object based on the setting information of the illuminated area, and
The texture storage unit
Storing a plurality of different illumination pattern textures depending on the type of event occurring in the object space;
The illuminated area setting unit includes:
An image generation system characterized in that an illumination pattern texture corresponding to the event type is texture-mapped to the illumination target object, and an illuminated area corresponding to the event type is set for the illumination target object. An image generation system for generating an image of an object space viewed from a given viewpoint,
An object data storage unit that stores object data of a moving object that is an illumination source that moves in the object space, and object data of an illumination target object that receives illumination from the moving object;
An object space setting unit for setting the moving object and the illumination target object with respect to the object space;
A texture storage unit for storing an illumination pattern texture in which an illumination pattern of illumination light emitted from the moving object is set;
An illuminated area setting unit configured to texture-map the illumination pattern texture to an illumination target object and set an illuminated area for the illumination target object;
An illumination processing unit that performs illumination processing for reflecting the illumination light on the illumination target object based on the setting information of the illuminated area, and
The illumination processing unit
A process of adjusting a color obtained based on object data of the illumination target object is performed as an illumination process based on an influence parameter with respect to the illumination light set in advance with respect to the vertex constituting the illumination target object. An image generation system. In any one of Claims 10-12,
Using a projection matrix that represents the spread of the illumination light from the projection center set for the moving object, texture coordinates for the illumination pattern texture corresponding to vertex coordinates included in the object data of the illumination target object are obtained. It further includes a texture coordinate calculation unit for calculating,
The illuminated area setting unit includes:
An image generation system, wherein the illumination pattern texture is texture-mapped to an illumination target object based on the obtained texture coordinates, and an illuminated area is set for the illumination target object.