JP2007272273A - Image generation system, program, and information storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image generation system, a program, and an information storage medium for properly achieving image expressions corresponding to speediness while saving the consumption of a memory. <P>SOLUTION: A blur texture is generated by operating blur processing to a texture to be mapped on an object based on blur information. It is necessary to search to which direction and how much quantity the texture should be moved in order to operate the blur processing to the texture to be mapped on the object. Therefore, as the flow of processing for generating a blur texture, the deviation quantity and the deviation direction of the texture to be mapped on the object are set as blur information, and a blur texture is generated by operating the blur processing based on the set blur information. The generated blur texture is mapped on a polygon. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  Conventionally, an image generation system that generates an image that can be viewed from a virtual camera (a given viewpoint) in an object space (virtual three-dimensional space) in which a vehicle object (an example of a moving object) such as a race game is placed and set Is known and is popular as a place to experience so-called virtual reality. In such a race game, there is a case where blur processing is performed to express an image that increases the sense of speed.

  Blur represents a visual effect on the movement of a virtual camera or object within one frame. As a method for performing blurring, there are a multi-rendering method, a moving locus volume method, and the like.

  The multi-rendering method is a method of combining images that average the state in the object space for each minute time in one frame.

  The moving track volume method creates volume data (moving track volume) of an object's moving track based on the position coordinates of the past object and the current object's position, and renders the moving track volume translucently. It is a technique.

However, in the multi-rendering method, a 3D operation is required every minute time, and an area for storing an image indicating the state in the object space every minute time needs to be secured in the memory. Will do. In addition, in the movement trajectory volume method, the model is simply stretched and drawn, which may result in an unnatural display.
Japanese Patent No. 4-172497 Japanese Unexamined Patent Publication No. 7-93586

  The present invention has been made in view of the above problems, and an object of the present invention is to generate an image that can appropriately express an image according to a sense of speed while saving memory consumption. A system, a program, and an information storage medium are provided.

  The present invention is an image generation system for generating an image viewed from a virtual camera in an object space, and includes a virtual camera control unit that controls the position and orientation of the virtual camera in the object space, and control information of the virtual camera. A blur information setting unit configured to set blur information, a texture generation unit configured to generate a blur texture obtained by performing blur processing on a texture mapped to a given object based on the set blur information; A drawing unit that draws while mapping the blur texture to the given object set in the object space, and the blur information setting unit obtains according to the moving speed of the virtual camera A texture shift amount is set as the blur information, and the texture generation unit An image generation system and performing the blurring process on the texture on the basis of the shift amount that is.

  The present invention also relates to a program that causes a computer to function as each of the above-described units. The present invention also relates to an information storage medium that can be read by a computer and stores a program that causes the computer to function as each of the above-described units.

  According to the present invention, a blur texture obtained by performing blur processing on a texture mapped to an object is dynamically generated. Therefore, it is not necessary to store a plurality of images rendered in the past in the memory in order to perform blur processing as in the conventional method. Therefore, it is possible to reduce memory consumption.

  Furthermore, a texture shift amount is set according to the moving speed of the virtual camera, and blur processing is performed based on the set shift amount. Therefore, when the virtual camera moves, it is possible to express a sense of speed according to the movement status of the virtual camera.

  In the image generation system, the program, and the information storage medium of the present invention, the blur information setting unit sets the texture shift direction obtained according to the moving direction of the virtual camera as the blur information, and the texture generation unit The blur processing may be performed on the texture based on the set shift direction and the shift amount set in accordance with the moving speed of the virtual camera.

  In this way, the blurring process is performed by shifting the texture in the appropriate direction according to the moving direction of the virtual camera, so even if the degree of freedom of the moving direction of the virtual camera in the object space is high, the speed is appropriately adjusted. It is possible to express a feeling.

In the image generation system, the program, and the information storage medium of the present invention, when the course object is arranged along the moving path of the moving object that moves in the object space, the blur information setting unit includes the course object. A texture shift direction may be set as blur information in accordance with the relative movement direction of the virtual camera with respect to the plane constituting the image.

  In this way, since the texture shift direction is set according to the relative movement direction of the virtual camera with respect to the surfaces constituting the course object, the course object can be moved even if the virtual camera moves freely in the object space. Appropriate blur processing can be applied to the direction component belonging to the surface to be constructed. Therefore, it is possible to express the difference in the feeling of speed according to whether the virtual camera is moving in the traveling direction, the course change, the state of the course object, and the like.

  In the image generation system, the program, and the information storage medium of the present invention, when the course object is arranged along the moving path of the moving object that moves in the object space, the blur information setting unit includes the course object. The amount of the texture shift may be set to the magnitude of the relative movement speed of the virtual camera with respect to the plane constituting the image.

  In this way, since the amount of texture shift is set according to the relative moving speed of the virtual camera with respect to the surface constituting the course object, the blur is focused on only the moving speed of the virtual camera itself. Compared to processing, natural blur processing is applied to the surface of the course object, and a sense of speed can be expressed more accurately.

  In the image generation system, the program, and the information storage medium of the present invention, the blur information setting unit includes a moving speed vector obtained from the control information of the virtual camera and a texture reference set in association with the coordinate system of the object space. A reference direction component of the moving speed vector of the virtual camera may be obtained based on the direction, and the texture shift amount with respect to the reference direction may be set based on the obtained reference direction component.

  In this way, a shift amount with respect to the reference direction can be set for each texture mapped to an object existing in the object space. For this reason, each texture to be mapped can be subjected to blur processing according to the direction of the texture, so that it is possible to express an accurate sense of speed closer to reality.

  The present invention also provides an image generation system for generating an image viewed from a virtual camera in an object space, the virtual camera control unit for controlling the position and orientation of the virtual camera in the object space, and the movement in the object space Based on the set blur information, a moving body calculation unit that performs a calculation for moving the body object, a blur information setting unit that sets blur information based on the control information of the virtual camera and the movement information of the moving object, and the set blur information A texture generation unit that generates a blur texture obtained by performing blur processing on the texture mapped to the moving object, and a drawing that draws while mapping the blur texture to the moving object set in the object space The blur information setting unit A texture shift amount determined according to the relative moving speed of the moving object relative to the camera is set as the blur information, and the texture generation unit performs the texture shift on the texture based on the set shift amount. The present invention relates to an image generation system characterized by performing blur processing.

  The present invention also relates to a program that causes a computer to function as each of the above-described units. The present invention also relates to an information storage medium that can be read by a computer and stores a program that causes the computer to function as each of the above-described units.

  According to the present invention, since blur processing can be performed even when the virtual camera is not moving, it is possible to appropriately express the sense of speed of the moving object.

  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.

1. Configuration 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 vehicle 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 this embodiment, an object (course object, background object) to be subjected to blur processing on the object data storage unit 176 of the storage unit 170, or a moving object (player vehicle object, enemy vehicle) in the object space. Object data) is stored, and processing 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, the moving object calculation unit 112a performs a simulation calculation for moving a moving object (player vehicle object, enemy vehicle object) in the object space.

  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. As a result, 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 object data storage unit 176. Is done.

  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 by a Z buffer method (depth comparison method, Z test) using a Z buffer 179 (depth buffer) in which a Z value (depth information) of a drawing pixel is stored may be performed. it can. That is, when drawing pixels corresponding to the primitive of the object are drawn, the Z value stored in the Z buffer 179 is referred to. Then, the Z value of the referenced Z buffer 179 is compared with the Z value at the drawing pixel of the primitive, and the Z value at the drawing pixel is the front side when viewed from the virtual camera (for example, a small Z value). If it is, the drawing process of the drawing pixel is performed and the Z value of the Z buffer 179 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 blur information setting unit 122 and a texture generation unit 124.

  The texture storage unit 178 stores the texture mapped to the object from the information storage medium 180.

  The blur information setting unit 122 sets the texture shift amount according to the magnitude of the moving speed of the virtual camera, and sets the texture shift direction according to the moving direction of the virtual camera. Specifically, blur information (shift vector (ΔU, ΔV)) for performing blur processing is set.

  Based on the blur information set by the blur information setting unit 122, the texture generation unit 124 performs a process of generating a blur texture obtained by performing a blur process on the texture mapped to the object. Specifically, based on the blur information, a blur texture is generated by performing translucent synthesis while shifting the texture. The blur texture generated by the texture generation unit 124 is stored in the texture storage unit 178. The newly generated blur texture may be updated and stored in the storage area of the already generated blur texture. Further, the storage area of the already generated blur texture may be released.

  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. Method of this embodiment 2.1 Description of texture generation method In this embodiment, a method of generating a blur texture obtained by performing blur processing on a texture mapped to an object based on blur information is adopted. .

  In order to blur the texture mapped to the object, it is necessary to determine in which direction and how much the texture is moved. This is because in order to realistically express the sense of speed with respect to the movement of the virtual camera, it is necessary to appropriately represent the state of movement of the virtual camera (movement direction and amount of movement).

  Therefore, in this embodiment, as a flow of processing for generating a blur texture, first, a shift amount and a shift direction of a texture mapped to an object are set as blur information, and blur processing is performed based on the set blur information. Generates a blurred texture.

  Note that the blur information is information indicating the shift amount and shift direction of the texture mapped to the object, and can therefore be expressed as a vector. Therefore, in this embodiment, blur information is set as a shift vector (ΔU, ΔV). That is, the shift vector (ΔU, ΔV) is a vector that indicates a texture shift amount by its size (length) and indicates a texture shift direction by its direction.

  FIG. 2A shows an example of a texture mapped to an object and an example of a blur texture obtained by performing blur processing on the texture. FIG. 2B shows an example in which the generated blur texture is mapped to a polygon composed of vertices VX1 to VX4.

  In the present embodiment, the blur texture is dynamically generated based on the blur information. Therefore, it is not necessary to store a plurality of images rendered in the past in the memory in order to perform blur processing as in the conventional method. Further, if a blur texture is generated, the blur texture can be used many times when there are a plurality of objects to which the blur texture is mapped. Therefore, it is not necessary to store the blur texture in the memory for each object, so that the memory consumption can be reduced.

  Next, a method for generating a blur texture while performing blur processing will be specifically described. In this embodiment, the blur process is a process of performing the translucent synthesis process while shifting the texture using the above-described shift vector (ΔU, ΔV).

  Next, a method for determining the composite number of translucent composites will be described. The greater the number of composites, the smoother and clearer the displayed image will be. However, if the number of combined images increases, the drawing processing load for drawing may increase. Therefore, the number of combined images is determined so that the displayed image looks smooth and beautiful and the drawing processing load is small.

  In this case, a method for determining the minimum number of images to make the image subjected to blur processing smooth and beautiful as a predetermined composite number, and setting a threshold value for the drawing processing load of the system is set. There is a method of determining the number of composites based on the above.

  For example, when at least one of the U component and V component of the shift vector (ΔU, ΔV) is within 0.5 pixels, the number of synthesized images is increased by 3 and is increased by 1 every 0.1 pixels. decide.

  Next, the shift amount of each texture corresponding to the number of synthesized sheets is determined.

  In this embodiment, the textures for each composite number are shifted equally. For example, when the composite number is N (1 <N), the drawing position in the work buffer is first determined so that the upper left texel of the texture is the origin (0, 0) of the UV coordinate. Then, the texture is shifted for each value obtained by equally dividing the size of the shift vector (ΔU, ΔV) by (the number of composites−1), and rendering is performed while interpolating according to the composite rate. In addition, the direction of the texture shift vector for each composite number is the same as the direction of the shift vector (ΔU, ΔV). If the shift directions are the same, a beautiful image can be displayed.

  With reference to FIG. 3, the present embodiment will be described with reference to FIG. 3 for determining the number of composites and shifting the texture for each composite number.

  In this embodiment, the number of combined images is set to 3 when at least one of the U component and V component of the shift vector (ΔU, ΔV) is within 0.5 pixels, and every 0.1 pixels increase. In addition, the composite number is set to increase by one.

  FIG. 3 shows an example of a texture shift vector (ΔU, ΔV) = (0.4, 0.2) in the texture coordinate system (UV coordinate system). Considering the composite number here, since ΔU and ΔV are values of 0.5 pixels or less, the composite number is determined to be three.

  First, the drawing position in the work buffer is determined so that the upper left texel is at the origin (0, 0) of the UV coordinates.

  Next, the texture is shifted by a pixel amount corresponding to the shift vector (ΔU1, ΔV1) = (0.2, 0.1), and the texture is rendered while interpolating according to the synthesis rate (α value). Then, the texture is shifted by a pixel amount corresponding to the shift vector (ΔU2, ΔV2) = (0.4, 0.2), and the texture is rendered while being interpolated according to the synthesis rate (α value). Thus, in the present embodiment, the blur texture is generated while being shifted evenly.

  By the way, as a semi-transparent composition method, a method (first method) for obtaining a texel color at a time with a composition rate equally divided according to the number of composites by a pixel shader (first method) and an original texture (texture associated with an object) ) Is rendered while interpolating in accordance with the synthesis rate (α value) many times, and there is a method (second method) using α blending that generates an image.

  A specific procedure of the first method will be described with reference to FIG. In this embodiment, the original original texture 1, the original texture 2 shifted by the shift vector (ΔU1, ΔV1) with respect to the original texture 1, and the shift by the shift vector (ΔU2, ΔV2) with respect to the original texture 1 For the original texture 3, a technique of synthesizing a texture image with a weight (combination rate) of 1/3 that is the reciprocal of the composite number 3 is adopted.

In other words, when the number of combined images is N, the texture drawing position is shifted according to the shift vector (ΔU (N−1), ΔV (N−1)), and interpolation is performed with a weight of 1 / N (composition rate). Render. The texel color synthesized on the Nth sheet is CN. When the number of combined images is N, the texel color F (N) can be obtained by the following equation (A).
F (N) = 1 / N × (C1 + C2 + C3 +... + CN) (A)
Next, a specific procedure of the second method will be described with reference to FIG. First, the original texture 1 is rendered while interpolating according to the synthesis rate (α value). Then, the original texture 2 shifted by the shift vector (ΔU1, ΔV1) with respect to the original texture 1 is rendered while being interpolated according to the synthesis rate (α value). At this time, the two texture images rendered are averaged. That is, each texture image is synthesized with a weight of 1/2 (combination rate). Thereafter, the original texture 3 shifted by the shift vector (ΔU2, ΔV2) with respect to the original texture 1 is rendered. The image of the blur texture 1 and the image of the original texture 3 are combined with a weight (combination rate) of 2/3 to 1/3.

In other words, when the number of combined images is N, a new image is combined with the previous combined image (α value) while shifting by the pixel amount according to the shift vector (ΔU (N−1), ΔV (N−1)). Rendering while interpolating according to. The texel color synthesized on the Nth sheet is CN. When the number of combined images is N, the texel color F (N) can be obtained by the following equation (B).
F (N) = ((N−1) / N) × F (N−1) + 1 / N × CN (B)

2.2 Description of Blur Information Setting Method As described above, blur information is a texture shift vector (ΔU, ΔV) mapped to an object. Hereinafter, a method for setting a shift vector (ΔU, ΔV) that is blur information will be described.

  In the present embodiment, the shift vector (ΔU, ΔV) is obtained according to the magnitude of the moving speed of the virtual camera. This is because an image with a sense of speed corresponding to the magnitude of the moving speed of the virtual camera can be expressed.

  For example, when the virtual camera is stopped, since the moving speed of the virtual camera is zero, the magnitude of the shift vector (ΔU, ΔV) is also set to zero. Therefore, it is possible to prevent the blur process from being performed when the virtual camera is stopped. Further, since the blur texture is dynamically generated, it is not necessary to secure a storage area for storing the blur texture corresponding to the moving speed of the virtual camera in advance, and the memory consumption can be reduced.

  FIG. 5A shows the magnitude of the moving speed of the virtual camera C (the amount of movement per minute time). FIG. 5B shows that the moving speed of the virtual camera C corresponds to the texture shift amount L (the size of the shift vector (ΔU, ΔV)). Then, based on the shift vector (ΔU, ΔV), a blur texture as shown in the right diagram of FIG. 5B is generated.

  That is, the magnitude of the moving speed of the virtual camera C and the texture shift amount L are related to each other. The change in the moving speed of the virtual camera C is associated with the change in the texture shift amount L to express the difference in the feeling of speed of the virtual camera.

  Next, a method for obtaining the direction of the shift vector (ΔU, ΔV) based on the moving direction of the virtual camera C will be described. This is because if the direction of the shift vector (ΔU, ΔV) is not accurate, an unnatural image may be displayed in which the moving direction of the virtual camera is ignored.

  FIG. 6 is an example in which the direction of the texture shift vector (ΔU, ΔV) is determined according to the moving direction of the virtual camera C. Then, based on the shift vector (ΔU, ΔV), a blur texture as shown in the right diagram of FIG. 6 is generated.

  That is, the moving direction of the virtual camera and the direction of the texture shift vector (ΔU, ΔV) are related to each other. The change in the moving direction of the virtual camera C is associated with the change in the texture shift vector (ΔU, ΔV) to express the accuracy of the moving direction of the virtual camera.

  Next, how to obtain the shift vector (ΔU, ΔV) when the course object is arranged will be described.

  For example, when the virtual camera is moving on the course in the object space, it is desirable to appropriately express the sense of speed at which the virtual camera moves. In such a case, it is possible to express a sense of speed by generating a blur texture based on the shift vector (ΔU, ΔV) and mapping the generated blur texture to the course object.

  In the present embodiment, a shift vector (ΔU, ΔV) is obtained in accordance with the relative movement direction of the virtual camera with respect to the plane constituting the course object. That is, the blur texture is generated in consideration of the reference direction vector (the direction of the texture mapped to the course object). This is because if the blur process is performed without considering the reference direction vector, the moving direction of the virtual camera and the direction in which the blur process is performed do not match.

  In addition, when the plurality of textures mapped to the surfaces constituting the course object are all the same texture and the reference direction vectors are the same, it is only necessary to generate one blur texture. This is because blur texture can be used many times to reduce memory consumption.

  Also, the blur texture is mapped from the front of the course object toward the direction of travel. This is because the blur texture is mapped from an object that is easily noticed by the player, so that even if the drawing processing burden becomes heavy, it is possible to prevent the player from feeling uncomfortable.

  7 and 8 are examples of generating a blur texture by obtaining a shift vector (ΔU, ΔV) for a texture mapped to a surface constituting a course object.

  As shown in FIG. 7A, P1, P2, P3,..., PN are surfaces (polygons or primitives) constituting the course object. As shown in FIG. 7B, each surface is associated with a reference direction vector Vec1, Vec2,..., VecN. The reference direction vector is the texture direction mapped to the course object set in association with the object coordinate system. Further, the reference direction vector Vec1 is set so that the blur process is appropriately performed when converted into the texture coordinate system. For example, the reference direction vector Vec1 can be set as unit vector (X1, Y1, Z1) = (0, 0, 1).

  FIG. 8A shows an example in which the plane P1 is associated with the reference direction vector Vec1.

  FIG. 8B shows a case where the virtual camera moves in the z-axis direction in the object space. Based on the moving speed vector CVec and the reference direction vector Vec1 of the virtual camera C, a shift vector (ΔU, ΔV) is obtained, and a blur texture as shown on the right side of FIG. 8B is generated.

  FIG. 8C shows a case where the virtual camera moves in the x-axis direction in the object space. Based on the moving speed vector CVec and the reference direction vector Vec1 of the virtual camera C, a shift vector (ΔU, ΔV) is obtained, and a blur texture as shown on the right side of FIG. 8C is generated.

  In this way, by performing blur processing in consideration of the reference direction vector, it is possible to generate a natural and virtual camera speed image when blur texture is mapped to an object. it can.

  Next, a method for obtaining the texture shift vector (ΔU, ΔV) in accordance with the relative moving speed of the virtual camera with respect to the surface constituting the course object will be described with reference to FIG.

  As shown in FIG. 9A, the virtual camera moves at a low position from the surface constituting the course object. The virtual camera C1 in FIG. 9A moves in parallel to the plane P1 that constitutes the course object. On the other hand, the virtual camera C2 is also moving at the same moving speed and moving direction as the virtual camera C1, but is not parallel to the plane P2 constituting the course object.

  In such a case, in order to appropriately express the difference in speed between the virtual camera C1 and the virtual camera C2, the texture shift vectors (ΔU, ΔV) mapped to the objects constituting the plane P1 and the plane P2 are appropriately set. Ask. Specifically, a texture shift vector (ΔU, ΔV) is obtained relative to the surfaces constituting the course object.

  The reference direction vector of the surface P1 in FIG. 9A is (PVec1, QVec1), and the reference direction vector of the surface P2 (the texture direction mapped to the course object) is (PVec2, QVec2). The reference direction vector is associated with a coordinate system in the object space. Further, the moving speed vector of the virtual camera C1 is CVec1, and the moving speed vector of the virtual camera C2 is CVec2.

  The texture shift vector (ΔU, ΔV) mapped to the plane P1 is a vector SVec1 of the magnitude L1 projected on the plane P1 from the moving speed vector CVec1 of the virtual camera C1.

  The texture shift vector (ΔU, ΔV) mapped to the plane P2 is a vector SVec2 having a magnitude L2 projected onto the plane P2 from the moving speed vector CVec2 of the virtual camera C2.

  In this way, even when the virtual camera is moving at various angles within a distance close to the course object in the object space, it is possible to appropriately express the sense of speed of the virtual camera.

  Note that, as shown in FIG. 9C, the surfaces constituting each course object can be associated with a reference direction vector associated with a coordinate system in the object space. In this way, it is easy to obtain information on the reference direction vector of the surface constituting the course object.

  Next, a method for obtaining a texture shift vector (ΔU, ΔV) mapped to an object (for example, a wall or a tree) existing in the object space will be described. This is because the virtual camera can express a sense of speed as it moves freely in the object space.

  In this embodiment, the shift vector (ΔU, ΔV) is obtained based on the moving speed vector of the virtual camera and the reference direction vector of the texture mapped to the object (for example, wall or tree).

  As shown in FIG. 10A, P1, P2,. . . , PN are surfaces (polygons, primitives) constituting each object in the object space. Further, as shown in FIG. 10B, the surfaces P1, P2,. . . , PN are associated with texture reference direction vectors (PVec1, QVec1), (PVec2, QVec2),..., (PVecN, QVecN) set in association with the coordinate system of the object space. In this way, the reference direction vector for the surfaces constituting the object can be easily obtained.

  As shown in FIG. 11A, when the virtual camera C moves in the object space with the moving velocity vector CVec, the texture shift vector (ΔU, ΔV) mapped to the plane P1 is as follows. Can be asking.

  First, a reference direction vector (PVec1, QVec1) and a moving speed vector CVec are calculated using a UV coordinate system (texture coordinate system). Then, the moving speed vector CVec is projected onto the texture TEX1. The PVec1 component and the QVec1 component of the reference direction vector (PVec1, QVec1) of the projection vector SVec are obtained. The obtained reference direction components (ΔU, ΔV) correspond to texture shift vectors (ΔU, ΔV).

  In this way, it is possible to appropriately perform blur processing on an object (wall, tree, etc.) existing in the object space even when the virtual camera moves freely.

  By the way, if the virtual camera is stopped and the enemy vehicle object (an example of a moving object) is moving, or if the enemy vehicle object is moving faster than the moving speed of the virtual camera, the enemy vehicle It is desirable to appropriately express the sense of speed of the object.

  In the present embodiment, blur processing is performed on the texture mapped to the enemy vehicle object to express the sense of speed of the enemy vehicle object.

  As shown in FIG. 12A, when the virtual camera C is stopped and the moving object OB is moving at a high speed, it is mapped to the moving object OB based on the moving speed vector OBVec of the moving object OB. The texture shift vector (ΔU, ΔV) is obtained.

  As shown in FIG. 12B, when the moving object OB is moving at a higher speed than the virtual camera C, the moving speed vector OBVec of the moving object OB and the moving speed vector CVec of the virtual camera are set. Based on this, a texture shift vector (ΔU, ΔV) mapped to the moving object OB is obtained. If the direction of the moving speed vector OBVec of the moving object OB is the same as the direction of the moving speed vector CVec of the virtual camera, the magnitude of the shift vector (ΔU, ΔV) can be obtained by obtaining the difference between them.

  For example, FIG. 12C shows a case where the virtual camera C is stopped and the moving object OB is moving in the x-axis direction in the object space. Since the virtual camera is stopped, the magnitude of the relative moving speed of the moving object OB relative to the virtual camera is the moving speed of the moving object OB. Therefore, the magnitude of the shift vector (ΔU, ΔV) is obtained according to the magnitude of the moving speed of the moving object OB. Further, the direction of the shift vector (ΔU, ΔV) is obtained according to the moving direction of the moving object.

  Based on the displacement vector (ΔU, ΔV) obtained as described above, a blur texture is generated. If the generated blur texture is mapped to the moving object OB, it is possible to express how the moving object is moving at high speed.

  By the way, in the object space, there is a case where there is an object for which a state of rotation is to be expressed. For example, there are a disk object and a ferris wheel object that exist in the object space. It is desirable to perform blur processing on these objects to appropriately express the sense of speed of the virtual camera.

  In this embodiment, in order to make it appear as if the object is rotating, a method of changing the UV coordinate value of the texture mapped to the object with the passage of time is adopted.

  As shown in the right diagrams of FIGS. 13A to 13C, there is an object composed of triangular polygons. The object is given a pattern “A”. In order to make an object appear to rotate counterclockwise, the following processing is performed.

  First, as shown in FIG. 13A, the texture coordinates of each vertex of the polygons P1 to P8 are determined. The texture coordinates of the vertex VX0 of the polygon P1 are (U0, V0), the texture coordinates of the vertex VX1 are (U1, V1), and the texture coordinates of the vertex VX2 are (U2, V2). Similarly, the texture coordinates of the vertices of the polygons P2 to P8 are set so that the pattern “A” is added. When texture mapping is performed, a pattern “A” is added to the object.

  Then, after a lapse of a certain time (for example, after 1 second), the texture coordinates of each vertex of the polygons P1 to P8 are changed. In FIG. 13B, the texture coordinates of the vertex VX0 of the polygon P1 remain (U0, V0), but the texture coordinates of the vertex VX1 are (U2, V2), and the texture coordinates of the vertex VX2 are (U3, V3). It is. Then, the texture coordinates are set so that each texture vertex mapped to the polygons P2 to P8 is also given the pattern “A”. When texture mapping is performed, a pattern “A” is added to the object. Then, an image that looks as if the object is rotating counterclockwise can be generated from the state of FIG.

  As shown in FIG. 13C, from FIG. 13B, each of the textures mapped to the polygons P1 to P8 so that the polygons rotate counterclockwise after a certain period of time has elapsed (for example, after 1 second). Change the vertex texture coordinates. That is, the texture coordinates of the vertex VX0 of the texture mapped to the polygon P1 are (U0, V0), the texture coordinates of the vertex VX1 are (U3, V3), and the texture coordinates of the vertex VX2 are (U4, V4).

  That is, the texture coordinates of each vertex of the texture to be mapped to the polygons P1 to P8 are changed clockwise with the passage of time, the texture coordinates on the circumference with the vertex (U0, V0) as the origin.

  By doing so, it is possible to generate an image that looks as if the object is rotating counterclockwise as time passes.

  Next, a method for expressing these objects as if they are rotating and expressing the sense of speed of the virtual camera will be described with reference to FIG.

  First, the moving speed vector CVec and the texture reference direction vector Vec of the virtual camera C in the object space are converted into a UV coordinate system (texture coordinate system). Then, a shift vector (ΔU, ΔV) is obtained based on the reference direction vector Vec and the moving speed vector CVec of the virtual camera.

  The left diagrams of FIGS. 14A, 14B, and 14C show blur textures that have been subjected to blur processing based on shift vectors (ΔU, ΔV). The right figure shows an object to which the blur texture of the left figure is mapped.

  Hereinafter, a method for mapping the blur texture will be described. For example, texture mapping of the polygon P1 constituting the object is performed as follows.

  The reference direction vector Vec in FIG. 14A has a texel (U0, V0) as a start point and a texel (U1, V1) as an end point. Then, as described with reference to FIG. 13A, the texture coordinate (U0, V0), (U1, V1), and (U2, V2) regions are mapped to the respective vertices VX0, VX1, and VX2 of the polygon P1.

  FIG. 14B shows an example in which the texture reference direction vector Vec is changed after a predetermined time has elapsed (for example, after 1 second) from FIG. 14A. In this case, the reference direction vector has a texel (U0, V0) as a start point and a texel (U2, V2) as an end point. Then, as described with reference to FIG. 13B, the texture coordinate (U0, V0), (U2, V2), and (U3, V3) regions are mapped to the respective vertices VX0, VX1, and VX2 of the polygon P1.

  FIG. 14C illustrates an example in which the texture reference direction vector Vec is changed after a predetermined time has elapsed (for example, after one second) from FIG. 14B. In this case, the reference direction vector has a texel (U0, V0) as a start point and a texel (U3, V3) as an end point. Then, as described with reference to FIG. 13C, the texture coordinates (U0, V0), (U3, V3), and (U4, V4) are mapped to the vertices VX0, VX1, and VX2 of the polygon P1, respectively.

  By doing so, it is possible to perform blur processing appropriately according to the moving speed vector CVec of the virtual camera while making it appear as if the object is rotating counterclockwise, and the speed feeling of the virtual camera can be increased. Can be expressed appropriately.

  It should be noted that the change of the reference direction vector Vec and the change of the texture coordinates of each vertex of the polygon must be synchronized. That is, the period in which the reference direction vector Vec makes one round clockwise must be the same as the period in which the texture coordinates of each vertex of the texture mapped to the polygons P1 to P8 make one round. This is because the moving direction of the virtual camera does not match the direction in which the blur process is performed.

  For example, the end point of the reference direction vector Vec changes from (U1, V1) in FIG. (A) to (U2, V2) in FIG. (B), and the texture coordinates of VX1 of the polygon P1 are (U1, V1). The timing for changing from to (U2, V2) is the same.

  Next, a case where a plurality of players play this image generation system (game system) will be described.

  When an image viewed from the virtual camera in the object space is generated for each player, a blur texture mapped to the object is generated for each player. This is because the moving speed of the virtual camera varies from player to player, so that the feeling of speed of the virtual camera operated by the player should be appropriately expressed.

  Therefore, as shown in FIG. 15A, 1P (for player 1) blur texture 1 and 2P (for player 2) blur texture 2 are generated as textures mapped to the objects. It is mapped to an object to be displayed on screen R1 (screen for 1P) and screen R2 (screen for 2P).

  In this way, it is possible to express the sense of speed of the virtual camera for each player as shown in FIG.

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

  First, a moving speed vector of the virtual camera in the object space is obtained (step S10). Thereby, the magnitude of the moving speed of the virtual camera and the moving direction are determined.

  Next, a texture reference direction vector is acquired (step S11). This determines the orientation of the texture mapped to the object.

  Next, a texture shift vector (ΔU, ΔV) is obtained based on the moving speed vector of the virtual camera and the reference direction vector of the texture (step S12). The shift vector (ΔU, ΔV) is a texture shift amount and a shift direction. The shift amount is obtained according to the moving speed of the virtual camera. The shifting direction is obtained according to the moving direction of the virtual camera.

  Subsequently, the number of semi-transparent composites is determined according to the magnitude of the shift vector ΔU and the magnitude of ΔV (step S13).

Next, a texture shift vector and a composition rate (α value) are obtained for each composite number. (Step S14)
Then, semi-transparent synthesis is performed to generate a blur texture (step S15). Translucent composition is performed based on the composition ratio (α value) with the texture shift vector for each composition number. Note that the blur texture is generated in the texture storage unit.

  Finally, drawing is performed while mapping the blur texture onto the object (step S16).

4). Hardware Configuration FIG. 17 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.

  In the above embodiment, the course object is a fixed object. However, when expressing a texture moving to the course object such as a river or a belt conveyor, the movement speed of the texture and the relative speed of the virtual camera are set. Then, the shift vector (ΔU, ΔV) may be set to generate a blur texture.

  In addition, for example, when the virtual camera moves on the course of a solid intersection or moves from a position where the entire course of the racing game can be seen, it is unnatural if blurring is applied to the texture mapped to the object. An image may be generated. In such a case, blur processing may be prohibited.

  In addition, when performing semi-transparent composition, you may perform by the method different from the method mentioned above.

  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.). The present invention is also applicable 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 game images, and a mobile phone. it can.

The example of a functional block diagram of the image generation system of this embodiment. 2A and 2B are explanatory diagrams of a texture generation method. FIGS. 3A and 3B are explanatory diagrams of a method for determining the number of composites for translucent composition. 4 (A) and 4 (B) are explanatory diagrams of a semi-transparent composition method. 5A and 5B are explanatory diagrams of a blur information setting method. Explanatory drawing of the setting method of blur information. 7A and 7B are explanatory diagrams of a blur information setting method. 8A, 8B, and 8C are explanatory diagrams of a blur information setting method. 9A, 9B, and 9C are explanatory diagrams of a blur information setting method. 10A and 10B are explanatory diagrams of a blur information setting method. 11A and 11B are explanatory diagrams of a blur information setting method. 12A, 12B, and 12C are explanatory diagrams of a blur information setting method. 13A, 13B, and 13C are explanatory diagrams of a blur information setting method. 14A, 14B, and 14C are explanatory diagrams of a blur information setting method. 15A and 15B are explanatory diagrams of a method for generating a blur texture for each player. The flowchart of the process of this embodiment. Hardware configuration example.

Explanation of symbols

C virtual camera OB moving object 100 processing unit, 110 object space setting unit, 112 movement / motion processing unit,
112a mobile object calculation unit, 114 virtual camera control unit, 120 drawing unit,
122 blur information setting unit, 124 texture generation unit 130 sound generation unit, 160 operation unit, 170 storage unit, 172 main storage unit,
174 Drawing buffer, 176 Object data storage unit,
178 texture storage unit, 179 z buffer, 180 information storage medium,
190 display unit, 192 sound output unit, 194 portable information storage device, 196 communication unit,

Claims (11)

A program for generating an image viewed from a virtual camera in an object space,
A virtual camera control unit that controls the position and orientation of the virtual camera in the object space;
A blur information setting unit for setting blur information based on the control information of the virtual camera;
A texture generation unit that generates a blur texture obtained by performing a blur process on a texture mapped to a given object based on the set blur information;
Causing the computer to function as a drawing unit for drawing while mapping the blur texture to the given object set in the object space;
The blur information setting unit
The amount of texture shift determined according to the moving speed of the virtual camera is set as the blur information,
The texture generator
A program which performs the blur processing on the texture based on a set shift amount. In claim 1,
The blur information setting unit
The texture shift direction obtained according to the moving direction of the virtual camera is set as the blur information,
The texture generator
A program for performing the blur processing on the texture based on a set shift direction and a shift amount set according to a moving speed of the virtual camera. In claim 2,
When a course object is placed along the movement path of a moving object that moves in the object space,
The blur information setting unit
A program for setting a texture shift direction as blur information according to a relative movement direction of the virtual camera with respect to a surface constituting the course object. In any one of Claims 1-3,
When a course object is placed along the movement path of a moving object that moves in the object space,
The blur information setting unit
A program for setting a texture shift amount to a magnitude of a relative moving speed of the virtual camera with respect to a surface constituting the course object. In claims 1 to 4,
The blur information setting unit
A reference direction component of the moving speed vector of the virtual camera is obtained based on a moving speed vector obtained from the control information of the virtual camera and a texture reference direction set in association with the coordinate system of the object space. A program for setting a shift amount of the texture with respect to the reference direction based on the reference direction component. A program for generating an image viewed from a virtual camera in an object space,
A virtual camera control unit that controls the position and orientation of the virtual camera in the object space;
A moving object calculation unit that performs an operation for moving the moving object in the object space;
A blur information setting unit for setting blur information based on control information of the virtual camera and movement information of the moving object;
A texture generation unit that generates a blur texture obtained by performing a blur process on the texture mapped to the moving object based on the set blur information;
Causing the computer to function as a drawing unit for drawing while mapping the blur texture to the moving object set in the object space;
The blur information setting unit
A texture shift amount determined according to the relative moving speed of the moving object relative to the virtual camera is set as the blur information.
The texture generator
A program which performs the blur processing on the texture based on a set shift amount. A program for generating an image viewed from a virtual camera in an object space,
A virtual camera control unit that controls the position and orientation of the virtual camera in the object space;
A blur information setting unit for setting blur information based on control information of the virtual camera;
A texture generation unit that generates a blur texture obtained by blurring a texture mapped to a given object based on the set blur information;
Causing the computer to function as a drawing unit for drawing while mapping the blur texture to the given object set in the object space;
The blur information setting unit
The texture shift direction obtained according to the moving direction of the virtual camera is set as the blur information,
The texture generator
A program that performs the blur processing on the texture based on a set shift direction.   A computer-readable information storage medium, wherein the program according to any one of claims 1 to 7 is stored. An image generation system for generating an image viewed from a virtual camera in an object space,
A virtual camera control unit that controls the position and orientation of the virtual camera in the object space;
A blur information setting unit for setting blur information based on the control information of the virtual camera;
A texture generation unit that generates a blur texture obtained by performing a blur process on a texture mapped to a given object based on the set blur information;
A drawing unit for drawing while mapping the blur texture to the given object set in the object space,
The blur information setting unit
The amount of texture shift determined according to the moving speed of the virtual camera is set as the blur information,
The texture generator
An image generation system, wherein the blur processing is performed on the texture based on a set shift amount. An image generation system for generating an image viewed from a virtual camera in an object space,
A virtual camera control unit that controls the position and orientation of the virtual camera in the object space;
A moving object calculation unit that performs an operation for moving the moving object in the object space;
A blur information setting unit for setting blur information based on control information of the virtual camera and movement information of the moving object;
A texture generation unit that generates a blur texture obtained by performing a blur process on the texture mapped to the moving object based on the set blur information;
A drawing unit for drawing while mapping the blur texture to the moving object set in the object space,
The blur information setting unit
A texture shift amount determined according to the relative moving speed of the moving object relative to the virtual camera is set as the blur information.
The texture generator
An image generation system, wherein the blur processing is performed on the texture based on a set shift amount. An image generation system for generating an image viewed from a virtual camera in an object space,
A virtual camera control unit that controls the position and orientation of the virtual camera in the object space;
A blur information setting unit for setting blur information based on control information of the virtual camera;
A texture generation unit that generates a blur texture obtained by blurring a texture mapped to a given object based on the set blur information;
A drawing unit for drawing while mapping the blur texture to the given object set in the object space,
The blur information setting unit
The texture shift direction obtained according to the moving direction of the virtual camera is set as the blur information,
The texture generator
An image generation system, wherein the blur process is performed on the texture based on a set shift direction.