JP2009140370A - Program, information storage medium, and image generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a program and an image generation system for achieving a sense of high speed of a virtual camera and rendering effects to attract notice to an object while reducing a processing burden of the system, and an information storage medium thereof. <P>SOLUTION: Drawing processing is performed by using a concentration line model to which modelling is applied in advance. In such a case, the concentration line model is subjected to scaling processing and rotation processing, and the arrangement in an object space is performed in response to a position and a direction of the virtual camera. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  Conventionally, an image generation system (game system) that generates an image viewed from a virtual camera (a given viewpoint) in an object space (virtual three-dimensional space) in which a plurality of polygons are set is known. It is very popular for experiencing so-called virtual reality.

In such an image generation system, noise or the like is performed (for example, Patent Document 1), and a process for rendering the speed of a virtual camera or the like is performed (for example, Patent Document 2).
JP 2007-82628 A JP 2002-170131 A

  In addition, in order to increase the sense of speed, the degree of attention to the object, and the force, a concentration line from the edge of the screen to the center point (focus) of the screen is drawn using a plurality of polygons, and an effect of attracting the player is given. There is a processing, so-called concentrated line effect drawing technique. However, this drawing process has a drawback that the processing load is heavy. In particular, considering the realization of natural effects, it is necessary to change the shape of each of a plurality of polygons. However, the vertex calculation processing for changing the shape of each polygon has a large number of operations and a heavy processing load. It became a problem.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to reduce the processing load of the system and to provide a sense of speed of a virtual camera and a specific object (for example, a player character). An object of the present invention is to provide a program, an information storage medium, and an image generation system capable of realizing a production effect for attention.

(1) The present invention
A program for generating an image visible from a virtual camera in an object space,
A storage unit for storing a three-dimensional effect model composed of a plurality of effect objects;
In the object space, the computer functions as an object space setting unit that sets the effect model according to the position / orientation of the virtual camera.
The effect model is a model in which the plurality of effect objects are arranged around a predetermined axis,
The object space setting unit
The present invention relates to a program for setting the effect model at a position where the predetermined axis side of the effect model can be seen from a virtual camera.

  The present invention also relates to an information storage medium storing the program and an image generation system configured as each unit.

According to the present invention, by drawing using an effect model, it is possible to reduce the processing load and easily produce a concentrated line that gives a sense of speed and a powerful feeling.
(2) The program, information storage medium, and image generation system of the present invention are:
Each of the plurality of effect objects constituting the effect model is
It may have a length component in the predetermined axial direction.

According to the present invention, a long concentrated line can be expressed.
(3) The program, information storage medium, and image generation system of the present invention are:
The shape of each of the plurality of effect objects constituting the effect model is a triangle,
The effect model is
One ridge line of each of the plurality of triangle effect objects may be connected.

  According to the present invention, it is possible to express a thorn-shaped concentration line, and it is possible to realize a production effect that gives a sense of power and a sense of speed.

(4) Further, the program, information storage medium, and image generation system of the present invention include:
The shape of each of the plurality of effect objects constituting the effect model is a triangle,
The effect model is
Each surface of the plurality of triangular effect objects is along the side surface of the virtual cylinder surrounding the predetermined axis, and one ridge line of each of the plurality of triangular effect objects is along the outer periphery of the bottom surface of the virtual cylinder. May be arranged.

  According to the present invention, it is possible to generate an image with a natural concentration line.

(5) Further, the program, information storage medium, and image generation system of the present invention include:
The object space setting unit
The effect model may be arranged based on the orientation of the virtual camera and the predetermined axis.

  According to the present invention, the effect model can be arranged at an appropriate position according to the orientation of the virtual camera, and a more natural concentration line can be expressed.

(6) The program, information storage medium, and image generation system of the present invention include
The object space setting unit
The effect model may be arranged based on the line of sight of the virtual camera and the predetermined axis.

  According to the present invention, the effect model can be arranged at an appropriate position according to the line of sight of the camera, and a natural concentrated line can be expressed.

(7) Further, the program, information storage medium, and image generation system of the present invention include
The object space setting unit
The effect model may be arranged so that the predetermined axis coincides with the line of sight of the virtual camera.

  According to the present invention, it is possible to express a natural image in which a plurality of concentrated lines are directed from various directions to a focal point.

(8) Further, the program, information storage medium, and image generation system of the present invention include:
The computer is further caused to function as a scaling controller that scales the effect model with respect to the predetermined axis direction and at least one of the two axis directions perpendicular to and perpendicular to the predetermined axis. May be.

  According to the present invention, it is possible to produce concentrated lines with variations of different degrees of concentration while reducing the processing load and saving the storage capacity.

(9) The program, information storage medium, and image generation system of the present invention are:
The scaling control unit
A scaling factor may be obtained based on the moving speed of the virtual camera, and the effect model may be scaled in the predetermined axis direction based on the obtained magnification.

  According to the present invention, it is possible to produce a concentrated line that gives a sense of speed according to the moving speed of the virtual camera.

(10) The program, information storage medium, and image generation system of the present invention are:
The scaling control unit
A scaling magnification is obtained based on the arrangement relationship between the virtual camera and the effect model, and the angle of view of the virtual camera, and based on the obtained magnification, at least in a biaxial direction perpendicular to the predetermined axis and perpendicular to the predetermined axis. You may make it scale with respect to one axial direction.

  According to the present invention, it is possible to realize more natural effects of virtual camera speed and effects for making an object notice. For example, a concentrated line that converges from one edge of the screen to one point on the screen can be expressed.

(11) The program, information storage medium, and image generation system of the present invention are:
The object space setting unit
The effect model rotated with respect to the predetermined axis may be set in the object space.

  According to the present invention, it is possible to express a change in the concentration line pattern using one effect model. That is, according to the present invention, it is possible to express a state in which the concentration line changes while reducing the processing load as compared with the related art.

(12) Further, the program, information storage medium, and image generation system of the present invention include:
The object space setting unit
The effect model that is rotated with respect to at least one of two axes perpendicular to and perpendicular to the predetermined axis may be set in the object space.

  According to the present invention, it is possible to express a state in which the focus of a concentrated line changes. That is, according to the present invention, it is possible to express a state in which the focus of the concentrated line is changed by reducing the processing load as compared with the conventional case.

  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 an object (player character, moving object), and its function can be realized by a lever, a button, a steering, a microphone, a touch panel type display, or a casing.

  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 object data storage unit 176 stores object data of objects. For example, the data (effect object, polygon) of the effect model (concentrated line model etc.) is stored.

  Here, the effect model is a three-dimensional model composed of a plurality of effect objects. That is, the effect model is a model in which a plurality of effect objects are arranged around a predetermined axis. Here, the shape of each of the plurality of effect objects constituting the effect model may be a triangle, or may be a polygon such as a line polygon (line) or a rectangle.

  In addition, each of the plurality of effect objects constituting the effect model of the present embodiment has a length component in the predetermined axis direction. For example, the predetermined axis is, for example, the z axis of a modeling coordinate system in which an effect model is defined. The plurality of effect objects constituting the effect model have a length component in a predetermined axial direction, and each of the plurality of triangle effect objects (triangle polygons) has a length component as shown in FIGS. It is formed by connecting ridge lines. That is, the effect model is a model formed by arranging each of the plurality of triangular effect objects along the outer periphery and the side surface of the virtual cylinder (which may be a column) surrounding the predetermined axis (z axis).

  More specifically, the effect model is obtained by connecting an isosceles triangular polygon to each side of a polygon including a circle with a radius r centered at the origin 0 in the x, y, and z axis modeling coordinate system. In this model, the length in the z negative direction is irregularly (non-uniformly) formed.

  Note that the operation unit 160 may be one that can input input data (operation data) from a player by an input device that includes an acceleration sensor, an imaging unit, or a gyro sensor that detects angular velocity. For example, the input device may be one that the player holds and moves, or that the player wears and moves. The input device also includes a controller simulating an actual tool such as a sword-type controller or gun-type controller held by the player, or a glove-type controller worn by the player (attached to the hand of the player). It is. The input device includes a game device integrated with the input device, a portable game device, a mobile phone, and the like.

  For example, an acceleration sensor provided in an input device detects acceleration in three axes (X axis, Y axis, and Z axis). That is, the acceleration sensor can detect acceleration in the vertical direction, the horizontal direction, and the front-rear direction. The acceleration sensor detects acceleration every 5 msec. Further, the acceleration sensor may detect a uniaxial, biaxial, or six-axis acceleration. The acceleration detected from the acceleration sensor is transmitted to the game device (main device) by the communication unit of the input device.

  The imaging unit provided in the input device includes an infrared filter, a lens, an imaging device (image sensor), and an image processing circuit. The infrared filter is disposed in front of the input device and allows only infrared light to pass through from light incident from a light source disposed in association with the display unit 190. The lens condenses the infrared light transmitted through the infrared filter and emits it to the image sensor. The image pickup device is a solid-state image pickup device such as a CMOS sensor or a CCD, for example, and picks up infrared light collected by the lens to generate a picked-up image. A captured image generated by the image sensor is processed by an image processing circuit. For example, the captured image obtained from the image sensor is processed to detect a high-luminance portion, and the position information (specific position) of the light source in the captured image is detected. If there are a plurality of light sources, position information on the captured image is detected. Further, the detected position information on the captured image is transmitted to the main device by the communication unit.

  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. The information storage medium 180 can store 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 communication unit 196 performs various controls for communicating with the outside (for example, another image generation system), and the function is realized by various processors or hardware such as a communication ASIC, a program, or the like. it can.

  Note that a program or data for causing a computer to function as each unit of the present embodiment stored in the information storage medium or storage unit of the server is received via the network, and the received program or data is received by the information storage medium 180. Or may be stored in the storage unit 170. The case where the program or data is received and the image generation system is made to function is also 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, the game process includes a process for starting a game when a game start condition is satisfied, a process for advancing the game, an object such as a character or a map, a process for placing an effect model (concentrated line model), and an object display. A process for calculating a game result, a process for ending a game when a game end condition is satisfied, and the like.

  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 scaling control unit 116, a rotation control unit 118, 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. For example, the position and rotation angle (synonymous with the direction and direction of the object in the world coordinate system, for example, rotation when rotating clockwise when viewed from the positive direction of each axis of the X, Y, and Z axes in the world coordinate system. The angle is determined, and the object is arranged at the position (X, Y, Z) at the rotation angle (rotation angle about the X, Y, Z axis).

  In particular, the object space setting unit 110 of the present embodiment sets an effect model in the object space according to the position and orientation of the virtual camera.

  The object space setting unit 110 sets the effect model at a position where the predetermined axis side of the effect model (the inside of the effect model surrounding the axis) can be seen from the virtual camera.

  Further, the object space setting unit 110 arranges the effect model based on the orientation of the virtual camera and the predetermined axis. That is, the effect model is arranged based on the line of sight of the virtual camera and a predetermined axis (z axis of the modeling coordinate system in which the effect model is defined). Note that the effect model may be arranged so that a predetermined axis coincides with the line of sight of the virtual camera. More specifically, the object space setting unit 110 uses the coordinate conversion matrix that converts the coordinate value of the modeling coordinate system in which the effect model is defined into the coordinate value of the camera coordinate system, and the polygons that make up the effect model. A process of converting the coordinate value of each vertex is performed.

  The object space setting unit 110 may set the effect model rotated about a predetermined axis in the object space. The object space setting unit 110 may set an effect model rotated about at least one of two orthogonal axes perpendicular to a predetermined axis in the object space.

  The movement / motion processing unit 112 performs movement / motion calculation (movement / motion simulation) of an object (a character, a moving body, etc.). In other words, based on operation data input by the player through the operation unit 160, a program (movement / motion algorithm), various data (motion data), a physical law, or the like, the object is moved in the object space or the object is moved ( (Motion, animation). 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.

  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, the position (X, Y, Z) or rotation angle of the virtual camera in the world coordinate system (for example, the rotation angle when rotating in the clockwise direction when viewed from the positive direction of each axis of the X, Y, and Z axes). Process to control. In short, processing for controlling the viewpoint position, the line-of-sight direction, and the angle of view is performed.

  For example, when an object (eg, character, moving object) is photographed from behind using a virtual camera, the position or rotation angle of the virtual camera (the direction of the virtual camera) 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 scaling control unit 116 of the present embodiment scales the effect model with respect to a predetermined axis direction and at least one of the two axis directions perpendicular to the predetermined axis and perpendicular to each other.

  The scaling control unit 116 obtains a scaling magnification based on the moving speed of the virtual camera, and scales the effect model in a predetermined axis direction (for example, the z-axis direction of the modeling coordinate system) based on the obtained magnification.

  The scaling control unit obtains a scaling magnification based on the arrangement relationship between the virtual camera and the effect model and the angle of view of the virtual camera, and is perpendicular to the predetermined axis based on the obtained magnification and orthogonal Scaling is performed with respect to at least one of the two axes (for example, the x and y axes in the modeling coordinate system).

  More specifically, the scaling control unit 116 of the present embodiment performs a process of scaling (enlarging / reducing) the effect model in a predetermined direction around the origin of the modeling coordinate form.

  The scaling control unit 116 is information on at least one of the distance from the position of the virtual camera to a given position in the view volume range (for example, the distance from the virtual camera to the front clipping plane), the angle of view of the virtual camera, and the aspect ratio. The viewport size is obtained based on the above, the magnification (scaling parameter) is obtained based on the viewport size, and the x and y components of the modeling coordinate form of the effect model are scaled based on the magnification. Note that the magnification applied to the x component and the magnification applied to the y component may be the same or different. For example, the ratio of the magnification applied to the x component and the magnification applied to the y component may be the same as the aspect ratio.

  The scaling control unit 116 can perform processing for scaling the effect model in the z direction around the origin of the modeling coordinate shape. In such a case, the scaling factor in the z direction may be changed according to the moving speed of the virtual camera.

  Note that the scaling control unit 116 of this embodiment is not limited to the modeling coordinate system, and may perform scaling processing in various coordinate systems (world coordinate system, camera coordinate system, projection coordinate system, device coordinate system).

  The rotation control unit 118 of the present embodiment performs a process of rotating the effect model with respect to at least one of the x, y, and z axes of the modeling coordinate system. In addition, after performing coordinate conversion for converting the coordinate values of the polygons constituting the effect model stored in advance from the modeling coordinate system to the camera coordinate form (viewpoint coordinate form), the x, y of the camera coordinate form is obtained. , And may be rotated with respect to at least one of the z axes.

  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 present embodiment, a process for obtaining a coordinate conversion matrix for converting each vertex of the effect object (polygon) constituting the effect model from the modeling coordinate system in which the effect model is defined to the camera coordinate system is performed.

  In the vertex processing, according to the vertex processing program (vertex shader program, first shader program), vertex movement processing, coordinate transformation, for example, world coordinate transformation, visual field transformation (camera coordinate transformation), clipping processing, perspective transformation (projection transformation) ), Geometry processing such as viewport conversion is performed, and based on 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.

  Note that 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. In the present embodiment, the hidden surface removal process is performed by the Z test, but the drawing pixels of the effect object (polygon constituting the concentrated line model) are controlled not to be the target of the Z test. In other words, the drawing pixels of the effect model are always drawn.

  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.

  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. Method of this embodiment (1) Outline In this embodiment, so-called concentrated line effect drawing processing is performed in real time in order to produce a sense of speed, a sense of presence, and a sense of power of a virtual camera.

  For example, when the virtual camera moves following the player character as in a ski game, when the moving speed of the player character increases, the moving speed of the virtual camera is also increased to the moving speed of the virtual camera. Correspondingly, the concentration line is changed to produce a sense of speed of the virtual camera.

  Conventionally, as shown in FIG. 2, this concentrated line is expressed by a plurality of n polygons A0 to An in the screen coordinate system, that is, two vertices a1 and a2 positioned at the edge of the screen, and the screen The concentration line is expressed by performing the process of determining the vertex a3 toward the center O of. However, in order to produce a natural virtual camera speed feeling, the length of each of the plurality of polygons A0 to An (the length from the edge of the screen toward the center) must be randomly changed for each frame. There has been a problem that the number of operations is large and the processing load of the image generation system becomes heavy.

  Therefore, in the present embodiment, the sense of speed of the virtual camera is expressed using a concentrated line model (effect model) modeled in advance. That is, in this embodiment, the concentrated line model stored in advance in the memory is arranged in the object space according to the position and orientation of the virtual camera, and the concentrated line model that can be seen from the virtual camera is drawn. Expresses the sense of speed of a virtual camera with a simple technique that reduces this.

  For example, a substantially cylindrical (substantially crowned) concentrated line model modeled in the modeling coordinate system shown in FIGS. 3A to 3D, that is, a plurality of polygons (effect object, concentrated line polygon, concentrated line object) B0. Drawing processing is performed using a concentrated line model constituted by ~ Bn. Then, as shown in FIG. 5, the scaling process (enlargement / reduction process) is performed so that the polygon containing the circle on the xy plane of the concentrated line model is inscribed in the viewport, and as shown in FIG. Concentrated lines are expressed by projecting a concentrated line model visible from the camera onto the projection plane. That is, the polygons B0 to Bn constituting the concentrated line model serve as concentrated lines and express a sense of speed and a sense of power. Note that the hidden surface removal process by the Z test is not performed on the pixels for drawing the polygons constituting the concentrated line model. This is because the concentrated line model is always drawn to achieve a natural effect.

  Further, in the present embodiment, as shown in FIG. 6, the concentrated line is dynamically changed by rotating a predefined concentrated line model at a random angle with respect to the z axis in the modeling coordinate system. Expresses the state.

  As described above, in the present embodiment, the concentrated line model is modeled in advance, and the processing load is reduced as compared with the prior art by arranging the concentrated line model at an appropriate position with respect to the virtual camera. It is possible to achieve a production effect that gives a sense of power and attention. Hereinafter, a specific method of this embodiment will be described.

(2) Concentrated line model First, the concentrated line model modeled in the modeling coordinate system is demonstrated using FIG. 3 (A)-(D).

  FIG. 3A is a perspective view of a concentrated line model which is an example of the concentrated line model of the present embodiment. 3B shows a diagram (top view) of the concentrated line model in the xz plane in the modeling coordinate system, and FIG. 3C shows a diagram (front view) of the concentrated line model in the xy plane in the modeling coordinate system. ). FIG. 3D is a diagram (side view) of the concentrated line model on the yz plane in the modeling coordinate system.

  The concentrated line model of the present embodiment is a three-dimensional model composed of a plurality of polygons B0 to Bn, as shown in FIG. That is, the concentrated line model is a model in which a plurality of polygons having a length in a predetermined direction are arranged in a ring shape. For example, each of the plurality of polygons constituting the concentrated line model has a length in the first direction (vertical direction) and a length in the second direction (horizontal direction). Specifically, as shown in FIG. 4, each of the plurality of polygons has a length h in the vertical direction and a length w in the horizontal direction. In the concentrated line model of this embodiment, a plurality of polygons are arranged in a ring shape so that the length in the vertical direction and the length in the horizontal direction are irregular. This is because a natural concentration line can be expressed.

  In this embodiment, as shown in FIG. 3A, the plurality of polygons constituting the concentrated line model of this embodiment are plane polygons (polygons having three or more vertices), and each polygon is The concentrated line model is formed so that the inner side of the concentrated line model is the surface of each polygon constituting the concentrated line polygon. In other words, the concentrated line model is formed so that the outside of the concentrated line model is the back surface of each polygon constituting the concentrated line model.

  The concentrated line model is formed so that the inside of the concentrated line model is the back side of each polygon that makes up the concentrated line polygon and the outside of the concentrated line model is the surface of each polygon that makes up the concentrated line model May be.

  In the concentrated line model, each polygon may be arranged along a virtual annular line. For example, as shown in FIG. 3A, the polygons (B0 to Bn) are arranged along a virtual polygonal annular line. In other words, the concentrated line model is a model arranged so as to form a ring when connecting at least one vertex of each of a plurality of polygons.

  Further, an example of the concentrated line model will be specifically described. For example, as shown in FIGS. 3A to 3D, the concentrated line model constitutes a polygonal side including a circle with a radius r on the xy plane with the origin 0 of the modeling coordinate system as the center point. It is configured by forming a plurality of polygons composed of two vertices and a point obtained by moving an arbitrary point on the side formed by the vertices of the two points in parallel in the negative z direction in the modeling coordinate system.

  In other words, the n polygons (B0 to Bn) constituting the concentrated line model are, for example, two polygonal points including a circle with a radius r, as shown in FIGS. 3 (A) to (D) and FIG. b1 and b2, and a point b3 on the line obtained by moving the midpoint of the line connecting the two points b1 and b2 in parallel to the z negative direction. That is, the polygon Bn is preferably an isosceles triangle having the bases of the line segments b1 and b2. This is because, in the generated image, it is possible to appropriately express how the polygons are concentrated toward one focal point.

  It should be noted that the length w of the side of the polygon that encloses the circle with the radius r on the xy plane may be non-uniform as shown in FIGS. It may be possible to form a regular polygon on the circumference. Further, the length h of each polygon stretched in the negative z direction may be non-uniform or uniform. Note that the length h in the negative z direction may be limited to a predetermined value or less. Note that the z coordinate values of the vertices b1 and b2 of each of the plurality of polygons B0 to Bn constituting the concentrated line model do not necessarily have to be zero. For example, the z coordinate values of the vertices b1 and b2 of the polygons B0 to Bn may be different from each other.

(3) Method for Setting Concentrated Line Model in Object Space In the concentrated line model of this embodiment, the inside of the concentrated line model is the surface of each polygon constituting the concentrated line polygon, and the outside of the concentrated line model is The concentrated line model is configured to be the back surface of each polygon constituting the concentrated line model. In this embodiment, it is meaningful to describe the inside of the concentrated line model. This is because the polygons that make up the concentrated line model can play the role of concentrated lines by performing perspective transformation (projection transformation) inside the concentrated line model (the surface of each polygon that makes up the concentrated line model). is there. That is, by projecting from each point of the polygon constituting the concentrated line model toward the virtual camera, for example, as shown in FIG. 6, a concentrated line from the surroundings toward the focal point can be expressed.

  Therefore, in the present embodiment, in order to appropriately express the concentrated line, the concentrated line model is arranged in the object space by the following method.

  First, in the present embodiment, coordinate conversion is performed to convert the coordinate values of the vertices of the polygons constituting the concentrated line model from the modeling coordinate system to the camera coordinate system. For example, the origin of the concentrated line model is placed at a given position in the view volume on the z-axis of the camera coordinate system.

  In the present embodiment, the concentrated line model is configured such that the annular portion of the front side edge portion of the concentrated line model configured by a plurality of polygons arranged in an annular shape is inscribed in the viewport or includes the viewport. Is arranged. The annular portion (polygon that encloses a circle) at the front edge of the concentrated line model is inside the viewport (projection plane, front clipping plane, rear clipping plane, or a section of the view volume parallel to the projection plane). Processing to set the object space so as to touch. In this way, in the generated image, the barbed portion of the polygon constituting the concentrated line model is directed to one point (focus) of the screen, and a natural concentrated line can be expressed. .

  For example, the xy component in the modeling coordinate system is multiplied by Sx times in the x-axis direction at the center of the origin, Sy times in the y-axis direction, and a scaling (enlargement / reduction) matrix for each vertex of the polygons that make up the concentrated line model Perform the process.

  That is, the scaling parameters Sx and Sy for performing scaling are the distance L from the horizontal size and vertical size of the viewport, the angle of view θ of the virtual camera, and the virtual camera (virtual camera origin) to a predetermined position in the view volume. (For example, the distance from the virtual camera to the front clipping plane) and the aspect ratio a (ratio between the horizontal width and the vertical width of the viewport).

  Note that the origin of the concentrated line model must be located within the range from the front clipping plane to the rear clipping plane, that is, the view volume. This is to prevent the concentrated line model from being drawn by clipping.

  Here, a case where the concentrated line model is arranged on the front clipping plane will be specifically described as an example. Based on the view angle θ of the virtual camera (horizontal view angle θ of the virtual camera) and the distance from the virtual camera to the front clipping plane L, the horizontal size Vw of the viewport and the vertical size Vh can be obtained. In other words, the horizontal size Vw of the viewport is obtained by the following equation (1).

Vw = 2L × tan (θ / 2) (1)
Further, based on the aspect ratio a, the vertical size Vh of the viewport is obtained by the following equation (2).

Vh = Vw / a = 2L / a × tan (θ / 2) (2)
In other words, the annular portion at the front side edge of the concentrated line model only needs to be inscribed in the viewport, and therefore the radius r1 of the circle on the xy plane of the concentrated line model after scaling from the horizontal size Vw and the vertical size Vh of the viewport. Can be obtained by the following equation.

  That is, as shown in FIG. 7B, the radius of the circle on the xy plane in the modeling coordinate system of the concentrated line model may be r1. Therefore, when the radius of the circle is set to r1, a concentrated line model is formed by a matrix (enlargement / reduction matrix) obtained by scaling r1 / r in the x-axis direction and the y-axis direction around the origin in the x and y components. The vertex of the polygon to be multiplied is multiplied, and the origin of the scaled concentrated line model is arranged at the position of the distance L from the virtual camera. That is, the values of the scaling parameters Sx and Sy are r1 / r.

  When the scaled concentrated line model is arranged, the plane parallel to the virtual camera (xy plane in the camera coordinate system) is arranged to be the xy plane of the concentrated line model.

  As described above, by arranging the concentrated line model in the object space, as shown in FIG. 6, after the perspective conversion and the viewport conversion, the edge of the annular portion at the front side edge of the concentrated line model is clipped. , Can express a natural concentration line.

(4) Method of changing the length of the concentrated line model In this embodiment, the length of the polygon of the concentrated line model (in the z-axis direction in the modeling coordinate system shown in FIG. 3) according to the change in the moving speed of the virtual camera. The length) is being scaled. That is, processing is performed to multiply the vertices of the polygons constituting the concentrated line model by a matrix that performs Sz scaling (enlargement / reduction) in the z-axis direction about the origin in the modeling coordinate system.

  In this way, the length of the generated image concentration line from the edge of the screen to the focal point becomes longer or shorter depending on the speed of the virtual camera. Can be realized.

  In such a case, the value of the scaling parameter Sz may be changed according to the moving speed of the virtual camera. For example, when the moving speed is zero, the scaling parameter Sz may be set to zero, and the scaling parameter Sz may be increased as the moving speed increases. Note that the scaling parameter Sz may be controlled so as not to exceed a predetermined value.

  For example, the value of the moving speed of the virtual camera when the scaling parameter Sz is 1 is determined in advance. For example, the value of the moving speed of the virtual camera when the scaling parameter Sz is 1 is determined to be 10. When the moving speed k of the virtual camera is assumed, a matrix obtained by scaling k / 10 to the z component is multiplied to each vertex of the polygon constituting the concentrated line model. Then, the scaled concentrated line model is set in the object space.

  In the present embodiment, processing for scaling the concentrated line model in the z direction may be performed according to the game situation. For example, when a special character is displayed or when the player reaches the goal point of the race, the scaling parameter for scaling in the z direction is doubled. In this way, it is possible to perform a production effect that is more concentrated than normal.

(5) Description of Rotation Control In this embodiment, as shown in FIG. 6, the concentrated line model is rotated at a random angle with respect to the z axis in the model coordinate system as time elapses. That is, for each frame, the rotation angle φ is determined, and the concentrated line model is set in the object space by multiplying the concentrated line model by a matrix that rotates the rotation angle φ with respect to the z axis.

  For example, the rotation angle φ is desirably set by obtaining a random value based on a random number algorithm. This is because if the player is rotated regularly, the player is informed that the same concentrated line model is used, and the curiosity of the game may be impaired. For example, the rotation angle φ is desirably controlled so as to be randomly rotated at a rotation angle of 60 degrees to 120 degrees.

  As described above, in the present embodiment, since control is performed to rotate randomly with respect to the z-axis using one modeled concentrated line model, the number of operations is subtracted significantly compared to the conventional method. . That is, the processing load can be reduced compared to the conventional case.

  In the present embodiment, the concentrated line model may be controlled to rotate with respect to the x axis and the y axis of the model coordinate system. In this way, the focal point of the concentrated line can be moved.

  For example, as shown in FIG. 8A, when the line-of-sight direction of the virtual camera of the current frame is set to the z-axis negative direction of the camera coordinate system, the line-of-sight direction of the virtual camera of the previous frame and the virtual camera of the current frame When rotating at an angle t1 with respect to the line-of-sight direction, that is, the angle t1 with respect to the positive x-axis direction, as shown in FIG. 8B, at each vertex of the polygon constituting the concentrated line model, After multiplying the matrix that rotates the rotation angle t1 from the positive direction of the x-axis of the modeling coordinate system, a process of arranging the concentrated line model is performed. In this way, as shown in FIG. 8C, the concentrated line is drawn so that the focal point of the concentrated line is below the center of the image, and the concentrated line corresponding to the movement of the virtual camera can be expressed.

  For example, as shown in FIG. 9A, when the line-of-sight direction of the virtual camera of the current frame is set to the negative z-axis direction of the camera coordinate system, the line-of-sight direction of the virtual camera of the previous frame and the current frame When rotating at a rotation angle t2 from the positive direction of the y-axis of the camera coordinate system, as shown in FIG. 9B, the positive direction of the y-axis of the modeling coordinate system is set at each vertex of the polygon constituting the concentrated line model. Is multiplied by a matrix that rotates the angle t2, and then the arrangement process is performed. In this way, as shown in FIG. 9C, the concentrated line is drawn so that the focal point of the concentrated line is to the left of the center of the image, and the concentrated line corresponding to the movement of the virtual camera can be expressed.

  When the concentrated line model is controlled to rotate about the x and y axes, the scaling parameters Sx and Sy for scaling the x and y axes of the concentrated line model are slightly larger than the scaling parameters obtained above. It is desirable to make an estimate. For example, as shown in FIG. 5, when the concentrated line model is arranged so that it fits well in the viewport, as shown in FIG. 10A when the concentrated line model is rotated at an angle t2 with respect to the y axis. For example, as shown in FIG. 10B, the edge of the annular portion of the front side edge of the concentrated line model is displayed on the screen, which is unnatural. There is a risk of being directed.

  Therefore, in the present embodiment, the final concentrated line model is scaled with the x and y components by multiplying the scaling parameters Sx1 and Sy1 for scaling the concentrated line model with a predetermined multiple so that the scaled line model is further expanded. Scaling parameters Sx2 and Sy2 are set.

  For example, after obtaining the scaling parameters Sx1 and Sy1 for scaling the x and y components of the concentrated line model by the aspect ratio, the angle of view of the virtual camera, and the distance L between the virtual camera and the front clipping plane as described above, By multiplying by a predetermined magnification (for example, 1.5), the final concentrated line model is set to scaling parameters Sx2 and Sy2 for scaling the x and y components. In this way, as shown in FIG. 11A, since the concentrated line model scaled slightly larger than the viewport is arranged in the object space, the concentrated line model as shown in FIG. Even when the model is rotated at the rotation angle t2 with respect to the y-axis, the edge of the annular portion at the front side edge of the concentrated line model is clipped, so that a natural concentrated line can be expressed.

  It is determined whether the edge of the annular portion of the front side edge of the concentrated line model is reflected in the viewport (screen, projection plane), and the annular portion of the front side edge of the concentrated line model is determined. When it is determined that the edge is reflected in the viewport (screen, projection plane), the concentrated line model may be controlled not to be drawn. Note that whether or not the edge of the annular portion of the front side edge is reflected in the viewport (screen, projection plane) is determined by the radius of the circle containing the polygon on the xy plane of the concentrated line model ( The major axis and minor axis length of the ellipse containing the polygon of the concentrated line model), rotation angles t1 and t2 around the x and y axes, the angle of view θ, the aspect ratio, and the like.

  In the present embodiment, when the concentrated line model is rotated and arranged in the object space, the distance M1 between the concentrated line model and the virtual camera is obtained by clipping the edge of the concentrated line model, and the distance from the virtual camera is obtained. A concentrated line model may be arranged at the position of M1. In this way, the edge of the annular portion at the front side edge of the concentrated line model is clipped, and a natural concentrated line can be expressed. For example, M1 is the radius of a circle that contains a polygon on the xy plane of the concentrated line model (the length of the major axis and minor axis of the ellipse that contains the polygon of the concentrated line model), and rotation around the x and y axes. It can be obtained based on the angles t1, t2 and the angle of view θ.

  For example, when the concentrated line model faces the direction of the virtual camera, the distance between the virtual camera and the concentrated line model is kept at M0 (L <M0; L is the distance from the virtual camera to the front clipping plane). When the concentrated line model is rotated, it is desirable to set the distance between the virtual camera and the concentrated line model to M1 (L <M1 <M0).

(6) Drawing process In the present embodiment, polygons constituting the concentrated line model may be drawn translucently. That is, processing (linear synthesis, addition synthesis processing, etc.) for synthesizing the color of the rendered original image and the color of the concentrated line polygon based on the α value is performed. In such a case, the drawing process is performed so as to change the α value (semi-transparency, translucency) of the concentrated line polygon according to the distance from the virtual camera. Specifically, the α value of the polygon of the concentrated line model is lowered based on the depth value (Z value) from the virtual camera. In this way, it is possible to generate an image in which the concentrated line model becomes transparent as it goes to the focal point, and the polygon color of the concentrated line model is merged with the color of the original image.

  Further, the α value may be changed according to the moving speed of the virtual camera. For example, as the movement speed of the virtual camera increases, the value of the α value is increased so that the color of the polygon constituting the concentrated line model becomes darker. As the movement speed of the virtual camera decreases, the value of the α value is increased. May be lowered so that the colors of the polygons constituting the concentrated line model become lighter. In this way, it is possible to further express the sense of speed of the virtual camera.

  In the present embodiment, the color of the polygons constituting the concentrated line model is not limited to one color (for example, white), and the colors of the polygons constituting the concentrated line model may be determined using a plurality of colors. Good.

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 concentrated line model defined in the modeling coordinate system is scaled (step S1). That is, the scaling process of the x and y components of the concentrated line model is performed, and the scaling process of the z component of the concentrated line model is performed based on the moving speed of the virtual camera and the like.

  Next, rotation control for rotating the concentrated line model is performed (step S2). For example, the concentrated line model is rotated around the origin of the modeling coordinate system at a rotation angle φ that is randomly determined with respect to the z-axis. Also, processing for rotating the concentrated line model at the rotation angle t1 with respect to the x axis around the origin of the modeling coordinate system in accordance with the rotation angle t1 of the x axis formed by the viewing direction of the previous frame and the viewing direction of the current frame. And the concentrated line model is rotated around the origin of the modeling coordinate system at the rotation angle t2 around the origin of the modeling coordinate system according to the rotation angle t2 of the y-axis formed by the viewing direction of the previous frame and the viewing direction of the current frame. Process.

  Then, the concentrated line model is placed in the object space (step S3). For example, coordinate conversion is performed by multiplying each vertex constituting the concentrated line model by a matrix that converts the coordinate value of each vertex of the polygon constituting the concentrated line model from the modeling coordinate form to the coordinate value of the camera coordinate system.

  And the process which produces | generates the image seen from a virtual camera is performed (step S4). That is, a perspective transformation process and a viewport transformation process are performed to generate an image. It should be noted that the polygon pixels constituting the concentrated line model are processed so as to be always drawn without performing the z test determination. The process ends here.

4). Application Example (1) Application Example of Scaling Process of Concentrated Line Model In the present embodiment, the technique for scaling the concentrated line model with the same scaling parameters with the x and y components centered on the origin of the modeling coordinate system has been described. The x and y components may be scaled with different scaling parameters. For example, the concentrated line model may be scaled according to the aspect ratio. For example, when the aspect ratio is 16: 9, the concentrated line model is scaled so that the ratio of the major axis i to the minor axis j is 16: 9 as shown in FIG. You may go. Then, the scaled concentrated line model is transformed into a substantially elliptical model and placed in the object space.

  In this way, for example, as shown in FIG. 13B, an appropriate concentration line can be expressed even when a plurality of characters are arranged. Further, even when the screen is divided vertically, the concentrated line can be appropriately expressed even when the horizontal size of the aspect ratio corresponding to the divided image is extremely longer than the vertical size.

(2) Application Example of Concentrated Line Model The concentrated line model of the present embodiment may be a model composed of line polygons as shown in FIGS. That is, it may be a line polygon obtained by moving a plurality of arbitrary points on a circle with a radius r on the xy plane centered at the origin 0 of the modeling coordinate system in parallel with the negative z direction. The length of each line polygon may be non-uniform or uniform.

  As shown in FIGS. 15A to 15D, the concentrated line model of the present embodiment may have a shape in which a gap is generated between polygons. That is, it may be constituted by a polygon constituted by an arbitrary side among polygon sides including a circle having a radius r on the xy plane.

  The concentrated line model of the present embodiment may be a model as shown in FIG. In other words, the shape may be such that the tips of the polygons forming the concentrated line model sag toward the z-axis. In such a case, it is desirable to limit the movement distance of the point so that the polygons do not intersect in the generated image. Note that, when such a concentrated line model is used, an image in which polygons having a high degree of concentration are concentrated in the line-of-sight direction is generated from the image subjected to the perspective transformation process.

  Further, the concentrated line model of the present embodiment may be a model as shown in FIG. In other words, the shape of the polygons constituting the concentrated line model may be such that the tips of the polygons are emitted radially from the z-axis. When such a concentrated line model is used, an image in which polygons having undergone perspective transformation processing are generated such that polygons having a low concentration level are concentrated in the line-of-sight direction.

(3) Method of mapping texture on cylindrical model In this embodiment, the cylindrical model (elliptical cylinder model) shown in FIG. 17A may be used as the concentrated line model. In such a case, texture mapping may be performed on the cylindrical model using the concentrated line texture TXT provided with the concentrated line pattern shown in FIG. That is, the concentrated line texture TXT is an image in which a thorn-like pattern is applied from the front end (U = 0) to the end (U = 1) of the concentrated line texture TXT. The tip of the concentrated line texture (U = 0) is on the front side when viewed from the virtual camera of the cylindrical model, and the end of the concentrated line texture is on the rear side when viewed from the virtual camera of the cylindrical model. A process of mapping the concentrated line texture TXT inside is performed. In this way, an image with a concentrated line pattern as shown in FIG. 17C can be generated.

  It is desirable that the resolution of the concentrated line texture is higher. This is to prevent the player from feeling uncomfortable because the pattern of the concentrated line texture TXT looks large in front.

(4) Method of drawing using a plurality of concentrated line models In this embodiment, a plurality of concentrated line models are prepared, and any one of the plurality of concentrated line models is selected based on the moving speed of the virtual camera or the game situation. A concentrated line model may be selected, and drawing may be performed using the selected concentrated line model. In this way, a concentrated line rich in variations can be expressed.

The example of a functional block diagram of the image generation system of this embodiment. An example of a technique for expressing a concentrated line. 3A to 3D are examples of the concentrated line model of the present embodiment. Explanatory drawing of the polygon which comprises a concentrated line model. Explanatory drawing of the method of arrange | positioning a concentrated line model in object space. Explanatory drawing of the concentrated line model after perspective transformation. 7A and 7B are explanatory diagrams of polygons constituting the concentrated line model. 8A to 8C are explanatory diagrams of rotation control of the concentrated line model. 9A to 9C are explanatory diagrams of rotation control of the concentrated line model. FIGS. 10A and 10B are explanatory diagrams of a technique for arranging the concentrated line model in the object space. FIGS. 11A and 11B are explanatory diagrams of a technique for arranging a concentrated line model in an object space. The flowchart of the process of this embodiment. 13A and 13B are explanatory diagrams of scaling of the concentrated line model. 14A to 14D are examples of the concentrated line model of the present embodiment. FIGS. 15A to 15D are examples of the concentrated line model of this embodiment. FIGS. 16A and 16B are examples of the concentrated line model of the present embodiment. FIGS. 17A to 17C are views for explaining a technique for expressing a concentrated line according to the present embodiment.

Explanation of symbols

100 processing unit, 110 object space setting unit, 112 movement / motion processing unit,
114 virtual camera control unit, 116 scaling control unit, 118 rotation control unit,
120 drawing part,
122 camera matrix calculation unit, 124 vertex matrix calculation unit,
126 vertex processing units, 130 sound generation units,
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, 196 Communication unit

Claims (14)

A program for generating an image visible from a virtual camera in an object space,
A storage unit for storing a three-dimensional effect model composed of a plurality of effect objects;
In the object space, the computer functions as an object space setting unit that sets the effect model according to the position / orientation of the virtual camera.
The effect model is a model in which the plurality of effect objects are arranged around a predetermined axis,
The object space setting unit
A program for setting the effect model at a position where the predetermined axis side of the effect model can be seen from a virtual camera. In claim 1,
Each of the plurality of effect objects constituting the effect model is
A program having a length component in the predetermined axial direction. In claim 1 or 2,
The shape of each of the plurality of effect objects constituting the effect model is a triangle,
The effect model is
A program formed by connecting one ridge line of each of the plurality of triangle effect objects. In any one of Claims 1-3,
The shape of each of the plurality of effect objects constituting the effect model is a triangle,
The effect model is
Each surface of the plurality of triangular effect objects is along the side surface of the virtual cylinder surrounding the predetermined axis, and one ridge line of each of the plurality of triangular effect objects is along the outer periphery of the bottom surface of the virtual cylinder. A program characterized by being a model placed in In any one of Claims 1-4,
The object space setting unit
A program characterized in that the effect model is arranged based on a direction of a virtual camera and the predetermined axis. In any one of Claims 1-5,
The object space setting unit
A program that arranges the effect model based on a line of sight of a virtual camera and the predetermined axis. In any one of Claims 1-6,
The object space setting unit
A program characterized in that the effect model is arranged so that the predetermined axis coincides with the line of sight of a virtual camera. In any one of Claims 1-7,
Causing the computer to further function as a scaling control unit that scales the effect model with respect to at least one of the two axial directions perpendicular to the predetermined axis and the predetermined axis. A featured program. In claim 8,
The scaling control unit
A program for obtaining a scaling magnification based on a moving speed of a virtual camera and scaling the effect model in the predetermined axis direction based on the obtained magnification. In claim 8 or 9,
The scaling control unit
A scaling magnification is obtained based on the arrangement relationship between the virtual camera and the effect model, and the angle of view of the virtual camera, and based on the obtained magnification, at least in a biaxial direction perpendicular to the predetermined axis and perpendicular to the predetermined axis. A program characterized by scaling with respect to one axial direction. In any one of Claims 1-10,
The object space setting unit
A program characterized in that the effect model rotated with respect to the predetermined axis is set in an object space. In any one of Claims 1-11,
The object space setting unit
A program characterized in that the effect model rotated with respect to at least one of two orthogonal axes perpendicular to the predetermined axis is set in an object space.   A computer-readable information storage medium, wherein the program according to any one of claims 1 to 12 is stored. An image generation system for generating an image visible from a virtual camera in an object space,
A storage unit for storing a three-dimensional effect model composed of a plurality of effect objects;
The object space includes an object space setting unit that sets the effect model according to the position / orientation of the virtual camera,
The effect model is a model in which the plurality of effect objects are arranged around a predetermined axis,
The object space setting unit
An image generation system, wherein the effect model is set at a position where the predetermined axis side of the effect model can be seen from a virtual camera.

Images