JP2019174871A - Image generation program, recording medium, and image generation method - Google Patents

Abstract

To naturally represent behavior of a modified object while reducing a processing load of an information processing apparatus.SOLUTION: An information processing apparatus 3 is caused to function as a reference point setting processing unit 13 for setting one or a plurality of reference points to a modified object capable of being modified, a control point setting processing unit 15 for setting a plurality of control points 61 to the modified object, a weight amount setting processing unit 17 for associating at least one reference point with the control point 61 and setting a weight amount representing a degree of relevance for the associated reference point, a target position calculation unit 19 for calculating a first target position of the control point 61 based on the first current position of the reference point associated with the control point 61 and the weight amount, a control point update processing unit 21 for updating a second current position of the control point 61 so as to approach the first target position, and an image generation processing unit 23 for generating an image representing a shape of the modified object based on the second current position.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an image generation program, a recording medium, and an image generation method.

  Conventionally, a technique for generating an image obtained by deforming a character object in a virtual space is known. According to this technique, the position of the secondary bone in the coordinate system fixed to the main bone is changed, the position of the control point in the coordinate system fixed to the virtual space is calculated based on the amount of change in the position of the secondary bone, The character object in the virtual space is deformed by generating an image in which the shape of the skin is determined based on the calculated position of the control point (see, for example, Patent Document 1).

Japanese Patent No. 4579964

  In the above-described conventional technology, there is a problem in that when the deformation of the deformed object is a natural behavior, it is necessary to perform a complicated operation and the calculation processing load of the information processing apparatus increases.

  The present invention has been made in view of such problems, and an image generation program capable of naturally expressing the behavior of a deformed object while reducing the processing load on the information processing apparatus, and the image generation program An object of the present invention is to provide a recording medium on which is recorded.

  In order to achieve the above object, an image generation program of the present invention provides an information processing apparatus for a reference point setting processing unit that sets one or a plurality of reference points for a deformable deformable object, and for the deformable object. A control point setting processing unit for setting a plurality of control points, a weight amount setting for associating at least one reference point with the control point and setting a weight amount representing the degree of association for each of the associated reference points A processing unit, a target position calculation processing unit for calculating a first target position of the control point based on a first current position of the reference point associated with the control point and the weight amount; A control point update processing unit that updates the second current position of the control point so as to approach, and an image generation processing unit that generates an image representing the shape of the deformed object based on the second current position To function as.

  In order to achieve the above object, a recording medium of the present invention is a recording medium readable by an information processing apparatus on which the image generation program is recorded.

  In order to achieve the above object, an image generation method of the present invention is an image generation method executed by an information processing apparatus, wherein one or more reference points are set for a deformable deformable object; The step of setting a plurality of control points for the deformed object, associating at least one reference point with the control point, and setting a weight amount representing the degree of association for each of the associated reference points. A step of calculating a first target position of the control point based on a first current position of the reference point associated with the control point and the weight amount, and approaching the first target position Updating the second current position of the control point; and generating an image representing the shape of the deformed object based on the second current position. That.

  According to the image generation program and the recording medium of the present invention, it is possible to naturally express the behavior of the deformed object while reducing the processing load of the information processing apparatus.

It is a system configuration figure showing an example of the whole game system composition concerning one embodiment. It is a block diagram showing an example of a functional structure of information processing apparatus. It is explanatory drawing showing an example of the setting of a reference point. It is explanatory drawing showing an example of the setting of a control point. It is explanatory drawing showing an example of the behavior of a reference point and a control point. It is explanatory drawing showing an example of the collision determination method. It is explanatory drawing showing an example of the behavior of the display position of the control point of a collision state. It is explanatory drawing showing an example of a polygon patch. It is a flowchart showing an example of the process sequence performed by CPU of information processing apparatus. It is a block diagram showing an example of the hardware constitutions of information processing apparatus.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a case where the present invention is applied to a game, that is, a case where a game is provided by executing the image generation program and the image generation method of the present invention by an information processing apparatus will be described. Is not limited to games.

<1. Overall configuration of game system>
First, an example of the overall configuration of the game system 1 according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the game system 1 includes an information processing device 3, a controller 5, and a display device 7. Each of the controller 5 and the display device 7 is communicably connected to the information processing device 3. In addition, although FIG. 1 illustrates the case of being connected by wire, it may be connected wirelessly.

  The information processing apparatus 3 is a stationary game machine, for example. However, the present invention is not limited to this, and for example, a portable game machine that is integrally provided with an input unit, a display unit, and the like may be used. In addition to game machines, for example, those manufactured and sold as computers such as server computers, desktop computers, notebook computers, tablet computers, mobile phones, smartphones, fablets, etc. As such, it may be manufactured and sold as a telephone.

  The player performs various operation inputs using the controller 5. In the example illustrated in FIG. 1, the controller 5 includes, for example, a cross key 9 and a plurality of buttons 11. The controller 5 may have, for example, a joystick or a touch pad instead of or in addition to the cross key 9 or the button 11.

<2. Functional configuration of information processing apparatus>
Next, an example of a functional configuration of the information processing apparatus 3 will be described with reference to FIGS. 2 and 3 to 8.

  As illustrated in FIG. 2, the information processing device 3 includes a reference point setting processing unit 13, a control point setting processing unit 15, a weight amount setting processing unit 17, a target position calculation processing unit 19, and a control point update processing unit. 21, image generation processing unit 23, collision determination processing unit 25, display target position calculation processing unit 27, first display position update processing unit 29, movement amount calculation processing unit 31, and first coefficient setting Processing unit 33, second coefficient setting processing unit 35, third coefficient setting processing unit 37, second display position update processing unit 39, patch setting processing unit 41, and third display position update processing unit 43 And an initial distance setting processing unit 45 and a distance constraint processing unit 47.

(2-1. Deformation process when there is no collision)
First, the deformation process when there is no collision with the deformed object will be described. The reference point setting processing unit 13 sets one or a plurality of reference points for deformable deformable objects. The control point setting processing unit 15 sets a plurality of control points for the deformed object.

  3 and 4 show an example of setting the reference points and control points. In the example shown in FIG. 3, a female model 49 is displayed in a three-dimensional virtual space (or a two-dimensional virtual space). The female model 49 wears a swimsuit 50 and performs various operations according to the operation of the controller 5 by the player. A world coordinate system (X, Y, Z) is set in the three-dimensional virtual space.

  The female model 49 includes left and right breasts 51L and 51R as deformable deformable objects. In addition to the breast, for example, a buttocks, a thigh, an abdomen, two arms, and other body parts that are soft enough to be deformed may be provided as deformed objects. Further, the deformed object (an object including the deformed object) is not limited to the female model described above, and may be, for example, a male model, an animal model other than a human, a virtual biological model other than a human or an animal, For example, an object other than a living organism may be used.

  The female model 49 includes a plurality of reference points (so-called bones) for moving the body. Each reference point is moved by a motion system (motion calculation or the like) of the female model 49 and has current position information (hereinafter referred to as “first current position”). The reference point setting processing unit 13 sets a part or all of them as reference points for deforming the breasts 51L and 51R. In the example shown in FIG. 3, the reference points 53 and 55 located near the left and right shoulder joints and the reference points 57 and 59 located near the centers of the left and right breasts 51L and 51R are used as a reference for deforming the breasts 51L and 51R. It is set as a point. In addition, you may set the reference point located in body parts (for example, neck joint) other than the above as a reference point for deform | transforming the breasts 51L and 51R.

  FIG. 4 shows an example of the control points 61 set for the breast 51L. Although not shown, the same applies to the breast 51R. The control point 61 is a point used for control to express the shape of the breast 51L. The plurality of control points 61 are arranged in a grid in the rectangular parallelepiped, and are set by the control point setting processing unit 15 so that the rectangular parallelepiped includes the breast 51L. The number of control points 61 is not particularly limited, but, for example, about 200 to 300 is set for each of the breasts 51L and 51R. Hereinafter, a group of control points 61 arranged in a grid pattern is referred to as an entity as a management unit. As shown in FIG. 3, an entity 63L is assigned to the breast 51L, and an entity 63R is assigned to the breast 51R.

  Returning to FIG. 2, the weight amount setting processing unit 17 associates at least one reference point with the control point, and sets a weight amount representing the degree of association for each associated reference point. In the present embodiment, the weight amount setting processing unit 17 associates three reference points 53, 55, and 57 with each control point 61 included in the entity 63L corresponding to the breast 51L, and the entity 63R corresponding to the breast 51R. The three reference points 53, 55, 59 are associated with each control point 61 included in. Further, the weight amount setting processing unit 17 sets a weight amount for each of the associated reference points 53, 55, and 57 for each control point 61 included in the entity 63L, and each control point 61 included in the entity 63R. On the other hand, a weight amount is set for each of the associated reference points 53, 55, 59. Note that the sum of weight amounts (ratio, ratio) for each reference point set in one control point 61 is 1.

  The target position calculation processing unit 19 calculates the target position of the control point (hereinafter referred to as “first target position”) based on the first current position of the reference point associated with the control point and the weight amount. Specifically, the target position calculation processing unit 19 determines the first target position of each control point 61 for all reference points associated with the control point 61 according to the following calculation formula (1). Is calculated by summing the products of the first current position and the weight amount.

Note that goal [i] εR ³ is the first target position of the i-th control point 61, BoneNum [i] εN is the number of reference points associated with the i-th control point 61, and BoneWeightArray [i] [j ] ∈R the weight of i-th j-th associated with the control point 61 of the reference point, BonePosition [k] ∈R ³ first current position of the k-th reference point, BoneArray [i] [j] ∈ Z is the index (array index) of the j th reference point associated with the i th control point 61.

  The control point update processing unit 21 updates the current position of the control point 61 (hereinafter referred to as “second current position”) so as to approach the first target position calculated by the target position calculation processing unit 19. For example, the control point update processing unit 21 updates the second current position of each control point 61 according to the following calculation formulas (2) and (3).

Note that NodeVelocity [i] (t) is the moving speed of the i-th control point 61 at time t, h is the time step, α is the rigidity of the deformed object, and goal [i] (t) is the i-th control point 61. The first target position at time t, NodePosition [i] (t) is the second current position at time t of the i th control point 61, and f _{ext [i]} (t) is at the i th control point 61 at time t. The acting external force, m [i], is the mass of the i-th control point 61. The rigidity α varies between 0 and 1. When α = 1, the deformable object is a rigid body, and when α <1, the closer the object is to 0, the softer the deformable object.

  FIG. 5 shows an example of the behavior of the reference points and control points by the control described above. FIG. 5 illustrates the control points 61 included in the entity 63L corresponding to the breast 51L and the associated reference points 53, 55, and 57, but the number of control points 61 is reduced to simplify the description. Will be described as a simple two-dimensional object.

  It is assumed that the reference points 53, 55, and 57 are moved as shown in FIG. 5B, for example, by operating the female model 49 from the initial state shown in FIG. As described above, a weight amount is set for each of the three reference points 53, 55, and 57 associated with each control point 61, and the first current position after the movement of the reference points 53, 55, and 57 The first target position 61g of each control point 61 is calculated according to the weight amount. FIG. 5B shows the calculated first target position 61g by a broken line. Thereafter, the second current position of each control point 61 is updated so as to approach the calculated first target position 61g, and each control point 61 is attracted to the first target position 61g by the speed based on the rigidity α described above. And as shown in FIG.5 (c), each control point 61 completes the movement to the 1st target position 61g. In this way, the flexible deformation of the breast 51L accompanying the body movement of the female model 49 is expressed.

  Returning to FIG. 2, the image generation processing unit 23 generates an image representing the shape of the deformed object based on the second current position of the control point 61 updated by the control point update processing unit 21. The control point 61 has display position information (hereinafter referred to as “display position”) in addition to the current position information (second current position). An image is generated based on the position. However, since the second current position and the display position substantially coincide with each other when there is no collision with the deformed object, the image generation processing unit 23 generates an image based on the second current position of the control point 61 when there is no collision. You can say.

(2-2. Deformation process when there is a collision)
Next, a deformation process when there is a collision with a deformed object will be described. The collision determination processing unit 25 determines whether or not there is a collision with the deformed object. The collision determination is performed on an entity basis. The collision determination method differs depending on whether or not the collision object colliding with the deformable object can be deformed (whether it is processed as a deformed object). If the collision object is an object that does not deform, the collision determination processing unit 25 determines whether or not the second current position of the control point 61 is located inside the collision object. Examples of collision objects that do not deform include items such as balls, capsules, and boxes, non-soft body parts (limbs, heads, shoulders, etc.) of other models, clothing (swimsuits, etc.), and the like. Note that a determination method when the collision object is a deforming object will be described later.

  FIG. 6 shows an example of the collision determination method. FIG. 6 illustrates the control points 61 included in the entity 63L corresponding to the breast 51L. However, in order to simplify the description, the number of control points 61 is reduced and described as a simple two-dimensional object.

  FIG. 6A shows a state before the collision. For example, a collision object 65 such as a ball is moving toward the entity 63L. FIG. 6B shows a collision start state, and the second current position of one of the control points 61 included in the entity 63 </ b> L is located inside the collision object 65. The control point 61 determined that the second current position is located inside the collision object is treated as a collision state. In FIG. 6 (b) and FIG. 6 (c), the control point 61 in this collision state is indicated by hatching. FIG. 6C shows a state in which a collision occurs, and a plurality of control points 61 are brought into a collision state when the collision object 65 advances by the movement direction and movement amount represented by the movement vector 67 from the start of the collision. ing.

  Returning to FIG. 2, the display target position calculation processing unit 27 determines the target position (hereinafter referred to as “second target position”) of the display position of the control point 61 in the collision state in which it is determined that the second current position is located inside the collision object. Is calculated based on the second current position, the distance from the control point 61 to the surface of the closest collision object, and the normal vector of the control point 61. The display position is information that each control point 61 has separately from the second current position as described above, and the image generation processing unit 23 renders the model using the display position. Similarly, the normal vector is information that each control point 61 has, and is a vector in a direction perpendicular to the surface direction of the surface of the deformed object at a position corresponding to the control point 61 (a vector that defines a direction in which the object is recessed at the time of collision). ).

  Specifically, the display target position calculation processing unit 27 calculates the second target position of each control point 61 in the collision state from the second current position of the control point 61 according to the following calculation formula (4). Calculate by subtracting the product of the distance and the normal vector.

  P_display_goal is the second target position of the control point 61, P is the second current position of the control point 61, D_surface is the distance from the control point 61 in the collision state to the nearest surface of the collision object 65, and N is the normal vector. is there. Note that the maximum value of D_surface is set for each control point 61, and is limited so that P_display_goal is not set to a position that is too far away. Thereby, unnatural deformation drawing can be prevented.

  The first display position update processing unit 29 updates the display position of the control point 61 in the collision state so as to approach the second target position calculated by the display target position calculation processing unit 27. Specifically, since the discontinuity is felt when the display position moves greatly in one frame, the display position is moved so as to gradually approach the second target position over several frames, for example. Further, the display position may be updated according to the above-described calculation formulas (2) and (3).

  FIG. 7 shows an example of the behavior of the display position of the control point 61 in the collision state by the above control. In FIG. 7, the control point 61 (shown by hatching) in the collision state is located at the second current position. The second target position 61pg, which is the target position of the display position 61p of the control point 61, is calculated by the above equation (4), and the display position 61p is a second position in the direction opposite to the normal vector N from the second current position. It is gradually moved toward the target position 61pg.

  By the above processing, it is possible to express deformation (behavior in which the colliding part is recessed) due to the collision object 65 colliding with the deformation object. However, for example, when a rubber ball is pressed, the behavior of the depressed portion being depressed is determined by the above processing content (the second target position of the control point 61 in collision is calculated and displayed so as to approach the second target position). It is expressed by the process of updating the position), but it is preferable to add a separate process for the behavior that the part that is not pressed swells. Next, the processing content will be described.

  Returning to FIG. 2, the movement amount calculation processing unit 31 moves the movement vector 67 representing the movement amount of the collision object 65 from the time when the collision object 65 starts to collide with the deformed object to the current time during the collision (see FIG. 6C). ). When a plurality of collision objects 65 collide with the deformed object, the movement amount calculation processing unit 31 calculates one movement vector obtained by averaging the movement vectors 67 of the collision objects 65.

  The first coefficient setting processing unit 33 sets the first coefficient in the direction of the movement vector 67 calculated by the movement amount calculation processing unit 31. The first coefficient is a coefficient that defines the degree of deformation of the deformable object in the collision direction.

  The second coefficient setting processing unit 35 sets a reference direction vector representing a reference direction different from the normal vector N and a second coefficient in the reference direction. The reference direction can be set to an arbitrary direction, and the direction in which the deformed object is particularly desired to be inflated at the time of collision is set as the reference direction. The second coefficient is a coefficient that defines the degree of deformation of the deformable object in the reference direction. In this embodiment, the female model 49 wears a swimsuit 50, but this swimsuit 50 is processed as a collision object against the breasts 51L and 51R. Therefore, for example, by setting the reference direction to the valley direction of the breasts 51L and 51R of the female model 49, when the swimsuit 50 is worn, the breasts 51L and 51R can be drawn in the valley direction. In addition, when the collision object 65 such as a ball collides with the breasts 51L and 51R, it is possible to produce such an effect that it swells in the valley direction.

  The third coefficient setting processing unit 37 sets an upward vector representing the upward direction in the world coordinate system of the three-dimensional virtual space where the deformed object exists, and a third coefficient in the upward direction. The upward vector is (0, 1, 0), for example. The third coefficient is a coefficient that defines the degree of deformation of the deformed object in the upward direction. As described above, since the swimsuit 50 is processed as a collision object with respect to the breasts 51L and 51R, by applying an upward deformation process to the breasts 51L and 51R, the portion covered with the swimsuit 50 is pressed by the swimsuit. While it is deformed so as to be tightened, it is possible to produce a bulge of the breast so that the portion not covered with the swimsuit 50 rises upward (toward the face). In addition, when the collision object 65 such as a ball collides with the breasts 51L and 51R, for example, it is possible to produce an effect of expanding upward.

  The second display position update processing unit 39 uses the above-described movement vector 67, the first coefficient, the reference direction vector, the second coefficient, the upward vector, and the third coefficient to determine the non-collision point other than the control point 61. The display position of the control point 61 in the collision state is updated. Specifically, the second display position update processing unit 39 updates the display position of the control point 61 in the non-collision state according to the following calculation formula (5).

  P_display is the display position of the control point 61, s_ref is the second coefficient in the reference direction, RefDirection is the reference direction vector, s_penetrate is the first coefficient in the direction of the movement vector 67, Penelate is the movement vector 67, and s_up is the upper position A third coefficient in the direction.

  In the above, the processing by the display target position calculation processing unit 27 and the first display position update processing unit 29 is performed on the control point 61 in the collision state, and the movement is performed on the control point 61 in the non-collision state. Control is performed so as to execute processing by the amount calculation processing unit 31, the first coefficient setting processing unit 33, the second coefficient setting processing unit 35, the third coefficient setting processing unit 37, and the second display position update processing unit 39. Although the process is made different depending on whether or not the point 61 is in a collision state, the present invention is not limited to this. For example, the processing for the control points 61 in the non-collision state may be executed for all the control points 61.

  With the above processing, it is possible to express a behavior in which a portion of the deformed object that is not pressed swells. However, when the collision object is a deformable object (that is, when the deformation objects collide), it is preferable to apply deformation processing to both objects. Next, the processing content will be described.

  The patch setting processing unit 41 sets a polygonal patch between the control points 61 adjacent to each control point 61 existing in the outer layer among the plurality of control points 61 set for the deformed object. . When the deformable objects collide with each other, the patch setting processing unit 41 sets the polygon patch for at least one of the deformable objects.

  FIG. 8 shows an example of a polygon patch. In FIG. 8, only the polygonal patch set for one control point 61 (central control point 61) is shown for the sake of simplicity. As shown in FIG. 8, a maximum of four triangular patches 69 (an example of polygonal patches) are set for each control point 61 existing outside the entity. In this example, a triangular patch is used, but a polygon other than a triangle (such as a square) may be used.

  The collision determination processing unit 25 described above determines whether or not the polygonal patch of one deformed object and the control point 61 of another deformed object penetrate. The penetration determination method is not particularly limited. For example, even if a known penetration process (thesis “Position Based Dynamics”, http://matthias-mueller-fischer.ch/publications/posBasedDyn.pdf) is used. Good. If it is determined by the collision determination processing unit 25 that there is a penetration, there is a collision, and if it is determined that there is no penetration, it is processed as no collision.

  When the collision determination processing unit 25 determines that the polygon patch of one deformed object and the control point 61 of another deformed object have penetrated, the third display position update processing unit 43 performs the penetration. The display position of the control point 61 of one deformed object and the display position of the control point 61 of another deformed object are updated so that the state that has been achieved is eliminated. The method of resolving and updating is not particularly limited. For example, a known penetration process (thesis “Position Based Dynamics”, http://matthias-mueller-fischer.ch/publications/posBasedDyn.pdf) Good.

  By the above processing, the deformation behavior due to the collision of soft objects can be expressed. For example, in the present embodiment, it is possible to represent the movement of the cleavage in the female model 49.

  The initial distance setting processing unit 45 sets an initial distance between each control point 61 and a plurality of adjacent control points 61 in an initial state where no collision has occurred.

  The distance constraint processing unit 47 determines the distance between the display positions so that the distance between the display positions of the control points 61 in the state where the collision has occurred approximates the initial distance set by the initial distance setting processing unit 45. Is restrained. The method of constraint processing is not particularly limited. For example, a known length constraint processing (thesis “Position Based Dynamics”, http://matthias-mueller-fischer.ch/publications/posBasedDyn.pdf) is used. May be.

  Through the above processing, the deformed object can be deformed so that the apparent volume becomes substantially constant. As a result, when the collision object collides with the deformed object, it is possible to express a behavior in which not only the collided part is recessed but also other parts swell, so that the deformation behavior can be expressed more naturally and realistically.

  Note that the processing in each processing unit described above is not limited to the example of sharing of these processing, and may be processed by, for example, a smaller number of processing units (for example, one processing unit), Further, it may be processed by a further subdivided processing unit. The functions of each processing unit described above are implemented by a game program executed by a CPU 101 (see FIG. 10 described later). For example, a part of the functions is a dedicated integrated circuit such as an ASIC or FPGA, and the like. It may be implemented by an actual device such as an electric circuit.

<3. Processing procedure executed by information processing apparatus>
Next, an example of a processing procedure executed by the CPU 101 of the information processing apparatus 3 will be described with reference to FIG.

  In step S5, the information processing apparatus 3 sets a plurality of reference points 53, 55, 57, and 59 for the breasts 51L and 51R by the reference point setting processing unit 13 (see FIG. 3).

  In step S10, the information processing apparatus 3 assigns the entities 63L and 63R to the breasts 51L and 51R by the control point setting processing unit 15 and sets a plurality of control points 61 arranged in a grid pattern for each entity. (See FIG. 4).

  In step S15, the information processing apparatus 3 associates at least one reference point with each control point 61 by the weight amount setting processing unit 17, and sets a weight amount for each of the associated reference points.

  In step S20, the information processing apparatus 3 uses the patch setting processing unit 41 to make triangular patches between the control points 61 adjacent to the control points 61 existing in the outer layer for each of the entities 63L and 63R. 69 is set.

  In step S25, the information processing apparatus 3 uses the initial distance setting processing unit 45 to connect each of the control points 61 of the entities 63L and 63R to a plurality of adjacent control points 61 in the initial state where no collision has occurred. Set the initial distance of.

  In step S <b> 30, the information processing apparatus 3 causes the target position calculation processing unit 19 to set the first target position of each control point 61 to the first current position of the reference point for all reference points associated with the control point 61. Is calculated by summing the product of the weight and the weight.

  In step S35, the information processing apparatus 3 causes the control point update processing unit 21 to update the second current position of each control point 61 so as to approach the first target position calculated in step S30. As described above, the second current position in this step substantially coincides with the display position.

  In step S <b> 40, the information processing apparatus 3 uses the collision determination processing unit 25 to determine whether there is a collision with the deformed object. As described above, when the collision object 65 is an object that does not deform, the collision determination processing unit 25 determines whether or not the second current position of the control point 61 is located inside the collision object 65. When the collision object 65 is a deformable object, the collision determination processing unit 25 determines whether or not the polygonal patch of one deformed object and the control point 61 of another deformed object pass through. . When it is determined that there is no collision (step S40: NO), the process proceeds to step S95 described later. On the other hand, when it is determined that there is a collision (step S40: YES), the process proceeds to the next step S45.

  In step S45, the information processing apparatus 3 determines whether or not there is a collision between the deformed objects based on which determination method is used to determine that there is a collision in step S40. If it is not a collision between the deformed objects (step S45: NO), the process proceeds to the next step S50.

  In step S50, the information processing apparatus 3 causes the display target position calculation processing unit 27 to change the second target position of the display position of the control point 61 in the collision state, the second current position of the control point 61, and the control. Calculation is performed based on the distance D_surface from the point 61 to the surface of the nearest collision object 65 and the normal vector N of the control point 61.

  In step S55, the information processing apparatus 3 updates the display position of each control point 61 in the collision state by the first display position update processing unit 29 so as to approach the second target position calculated in step S50. To do.

  In step S60, the information processing apparatus 3 uses the movement amount calculation processing unit 31 to calculate a movement vector 67 that represents the movement amount of the collision object 65 from the time when the collision object 65 started to collide with the deformed object to the current time during the collision. To do.

  In step S65, the information processing apparatus 3 sets the first coefficient in the direction of the movement vector 67 calculated in step S60 by the first coefficient setting processing unit 33.

  In step S <b> 70, the information processing apparatus 3 sets the reference direction vector and the second coefficient in the reference direction by the second coefficient setting processing unit 35.

  In step S75, the information processing apparatus 3 uses the third coefficient setting processing unit 37 to calculate the upward vector representing the upward direction in the world coordinate system of the three-dimensional virtual space where the deformed object exists and the third coefficient in the upward direction. Set.

  In step S80, the information processing apparatus 3 causes the second display position update processing unit 39 to execute the movement vector 67, the first coefficient, the reference direction vector, the second coefficient, the upward vector, and the third coefficient. The display position of each control point 61 in the non-collision state is updated. Thereafter, the process proceeds to step S95 described later.

  If it is a collision between the deformed objects in the previous step S45 (step S45: YES), the process proceeds to step S85.

  In step S85, the information processing apparatus 3 causes the third display position update processing unit 43 to cancel the state in which the polygon patch of one deformed object and the control point 61 of the other deformed object penetrate. The display position of the control point 61 of one deformation object and the display position of the control point 61 of another deformation object are updated.

  In step S90, the information processing apparatus 3 causes the distance constraint processing unit 47 to approximate the distance between the display positions of the control points 61 in the state where the collision has occurred to the initial distance set in step S25. The distance between the display positions is constrained. Thereafter, the process proceeds to the next step S95.

  In step S95, the information processing apparatus 3 causes the image generation processing unit 23 to constrain the distance in the display position of the control point 61 updated in steps S35, S80, and S85 (in the case of step S85, further in step S90). The image representing the shape of the breasts 51L and 51R, which are deformed objects, is generated based on the displayed display position. This flow is completed by the above.

  In addition, the process procedure mentioned above is an example, Comprising: At least one part of the said procedure may be deleted or changed, and procedures other than the above may be added. In addition, the order of at least a part of the above procedure may be changed, and a plurality of procedures may be combined into a single procedure. For example, step S90 may be executed instead of step S60 to step S80, or step S90 may be further executed between step S80 and step S95.

<4. Hardware configuration of information processing apparatus>
Next, an example of a hardware configuration of the information processing apparatus 3 that realizes each processing unit implemented by the program executed by the CPU 101 described above will be described with reference to FIG.

  As illustrated in FIG. 10, the information processing apparatus 3 includes, for example, a CPU 101, a ROM 103, a RAM 105, a GPU 106, a dedicated integrated circuit 107 configured for a specific application such as an ASIC or FPGA, and an input device 113. An output device 115, a recording device 117, a drive 119, a connection port 121, and a communication device 123. These components are connected to each other through a bus 109, an input / output interface 111, and the like so that signals can be transmitted to each other.

  For example, the game program can be recorded in the ROM 103, the RAM 105, the recording device 117, or the like.

  In addition, the game program is temporarily or permanently (non-temporarily) recorded on a removable recording medium 125 such as a magnetic disk such as a flexible disk, various CDs, MO disks, and optical disks such as a DVD, and semiconductor memory. You can also keep it. Such a recording medium 125 can also be provided as so-called package software. In this case, the game program recorded in these recording media 125 may be read by the drive 119 and recorded in the recording device 117 via the input / output interface 111, the bus 109, or the like.

  In addition, the game program can be recorded on, for example, a download site, another computer, another recording device, or the like (not shown). In this case, the game program is transferred via a network NW such as a LAN or the Internet, and the communication device 123 receives this program. The program received by the communication device 123 may be recorded in the recording device 117 via the input / output interface 111, the bus 109, or the like.

  Further, the game program can be recorded in an appropriate external connection device 127, for example. In this case, the game program may be transferred via an appropriate connection port 121 and recorded in the recording device 117 via the input / output interface 111, the bus 109, or the like.

  Then, the CPU 101 executes various processes according to the program recorded in the recording device 117, thereby realizing the processes by the above-described weight amount setting processing unit 17, the target position calculation processing unit 19, and the like. At this time, for example, the CPU 101 may directly read and execute the program from the recording device 117 or may be executed after being once loaded into the RAM 105. Further, for example, when receiving the program via the communication device 123, the drive 119, and the connection port 121, the CPU 101 may directly execute the received program without recording it in the recording device 117.

  Further, the CPU 101 may perform various processes based on signals and information input from the input device 113 including the controller 5 described above, such as a mouse, a keyboard, and a microphone (not shown), as necessary. .

  The GPU 106 performs processing for image display such as rendering processing in accordance with an instruction from the CPU 101.

  Then, the CPU 101 and the GPU 106 output the result of executing the above processing from the output device 115 including the display device 7 and the audio output unit described above, for example. Further, the CPU 101 and the GPU 106 may transmit the processing result via the communication device 123 or the connection port 121 as necessary, or may record the processing result in the recording device 117 or the recording medium 125.

<5. Effects of the embodiment>
The game program of the present embodiment sets the information processing device 3 to the reference point setting processing unit 13 for setting one or a plurality of reference points for a deformable deformable object, and the plurality of control points 61 for the deformable object. The control point setting processing unit 15 and the control point 61 for associating at least one reference point with the control point 61, and the weight amount setting processing unit 17 and the control point 61 for setting a weight amount representing the degree of association for each of the associated reference points The target position calculation processing unit 19 that calculates the first target position of the control point 61 based on the first current position and the weight amount of the reference point associated with the control point 61, The control point update processing unit 21 updates the second current position, and the image generation processing unit 23 generates an image representing the shape of the deformed object based on the second current position.

  Thereby, for example, a method for calculating the target shape by rotating and translating the initial shape of the deformed object so that an error from the current shape of the deformed object is minimized (for example, as described in JP-T-2009-529161). Compared to the method, a complicated calculation such as a least square method is not necessary, and the calculation processing load of the information processing apparatus 3 can be reduced. In addition, since the reference point to be an anchor is set, for example, the breasts 51L and 51R can be stably deformed even when the female model 49 is suddenly moved, and the deformed state can be stably created. . Therefore, the behavior of the deformed object can be made a natural expression. Furthermore, since the reference point is generally used as a bone for drawing a model, a character, or the like, and the bone can be used, it is suitable for expressing a model, a character, or the like.

  In the present embodiment, in particular, the game program causes the information processing apparatus 3 to determine whether or not the second current position of the control point 61 is located inside the collision object 65 that collides with the deformed object. 25. The second target position of the display position of the control point 61 in the collision state determined that the second current position is located inside the collision object 65 is the collision object 65 closest to the second current position and the control point 61. The target position calculation processing unit 27 for display that calculates based on the distance to the surface and the normal vector N of the control point 61, and updates the display position of the control point 61 in the collision state so as to approach the second target position. The first display position update processing unit 29 further functions, and the image generation processing unit 23 displays the shape of the deformed object based on the display position of the control point 61 in the collision state. To generate.

  Thereby, it is possible to express deformation (behavior in which the colliding part is recessed) due to the collision object 65 colliding with the deformation object. Further, by separately setting the second current position and the display position used for generating an image for each control point 61, it is possible to stabilize the drawing result of deformation at the time of collision.

  In this embodiment, in particular, the game program calculates the movement vector 67 representing the amount of movement of the collision object 65 from the time when the collision object 65 started to collide with the deformed object to the current time during the collision. A moving amount calculation processing unit 31 to perform, a first coefficient setting processing unit 33 to set a first coefficient in the direction of the moving vector 67, a reference direction vector representing a reference direction different from the normal vector N, and a first direction to the reference direction. For displaying the non-collision state control point 61 other than the collision state control point 61 based on the second coefficient setting processing unit 35 for setting two coefficients, the movement vector 67, the first coefficient, the reference direction vector, and the second coefficient. It further functions as a second display position update processing unit 39 for updating the position, and the image generation processing unit 23 changes the display based on the display position of the control point 61 in the non-collision state. It generates an image representing the shape of the object.

  For example, considering the case where a rubber ball is pressed, the behavior in which the pressed part is depressed is the above processing content (the second target position of the control point in the collision is calculated and the display position is updated so as to approach the second target position) However, it is necessary to add a separate process in a staging manner for the behavior that the part that is not pressed swells. In the present embodiment, a direction that is particularly desired to be expanded in terms of production is set as a reference direction vector, and the degree of expansion is set as the second coefficient. As a result, when the collision object 65 collides with the deformed object, it is possible to express a behavior in which not only the collided portion is recessed but also other portions swell in a predetermined direction, so that the deformation behavior can be expressed more naturally and realistically. In addition, since the bulge direction and the bulge condition can be set (for example, the breasts 51L and 51R are deformed in the valley direction), it is possible to produce an effect according to the contents of drawing, and to improve the interest.

  In the present embodiment, in particular, the game program sets the information processing device 3 to set the upward vector representing the upward direction in the world coordinate system of the virtual space where the deformed object exists and the third coefficient in the upward direction. The second display position update processing unit 39 further functions as the three-coefficient setting processing unit 37, and updates the display position of the non-collision control point 61 based on the upward vector and the third coefficient.

  In general, a collision object 65 such as a ball often collides with a deformable object from the side. In this case, the deformable object is deformed so that the side is recessed and swells upward or downward. For example, when the collision object is a clothing such as the swimsuit 50 and the deformation object is a body part (such as the breasts 51L and 51R) covered with the swimsuit 50, the deformation object is pressed from the side and covered with the swimsuit 50. It deforms so that it rises in the direction that is not (upward).

  Therefore, in the present embodiment, the upward direction in which the effect is desired to be inflated is set as an upward vector, and the degree of expansion is set as the third coefficient. Thereby, the deformation behavior as described above can be expressed more naturally and realistically.

  In the present embodiment, in particular, the game program causes the information processing device 3 to control points adjacent to the control points 61 existing on the outer layer among the plurality of control points 61 set for the deformed object. Further, the collision determination processing unit 25 allows the triangular patch 69 of one deformed object and the control point 61 of another deformed object to penetrate. If it is determined that the triangle patch 69 and the control point 61 have penetrated the information processing apparatus 3, the game program determines whether the penetrated state is eliminated. Further functioning as a third display position update processing unit 43 for updating the display position of the control point 61 of the deformed object and the display position of the control point 61 of another deformed object. So, the image generation processing unit 23 generates an image representing an alternative objects and other shapes of deformation objects on the basis of the display position.

  Thereby, the deformation | transformation behavior by the collision of soft objects can be expressed. For example, the deformation behavior when the rubber balls collide, the deformation behavior when the female models press each other's chest, and the deformation behavior such as the movement of the cleavage in the female model 49 can be expressed more naturally and realistically. .

  In the present embodiment, in particular, the game program causes the information processing apparatus 3 to set an initial distance with respect to the control point 61 with respect to a plurality of adjacent control points 61 in an initial state where no collision has occurred. The setting processing unit 45 further functions as a distance constraint processing unit 47 that constrains the distance between the display positions so that the distance between the display positions of the control points 61 in the state where the collision has occurred approximates the initial distance.

  Thereby, the deformed object can be deformed so that the apparent volume becomes substantially constant. As a result, when the collision object 65 collides with the deformed object, it is possible to express a behavior in which not only the collided part is recessed but also other parts swell, so that the deforming behavior can be expressed more naturally and realistically.

<6. Modified example>
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention.

  Although the case where the image generation program is a game program has been described above, the image generation program can also be applied to technologies other than games (for example, CG animation, computer simulation, CAD, etc.).

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination. In addition, although not illustrated one by one, the above-mentioned embodiment and each modification are implemented with various modifications within a range not departing from the gist thereof.

DESCRIPTION OF SYMBOLS 3 Information processing apparatus 13 Reference point setting process part 15 Control point setting process part 17 Weight amount setting process part 19 Target position calculation process part 21 Control point update process part 23 Image generation process part 25 Collision determination process part 27 Target position calculation for display Processing unit 29 First display position update processing unit 31 Movement amount calculation processing unit 33 First coefficient setting processing unit 35 Second coefficient setting processing unit 37 Third coefficient setting processing unit 39 Second display position update processing unit 41 Patch setting Processing unit 43 Third display position update processing unit 45 Initial distance setting processing unit 47 Distance constraint processing unit 50 Swimsuit (collision object)
51L, 51R Breast (deformation object)
53 reference point 55 reference point 57 reference point 59 reference point 61 control point 61p display position 61pg second target position 65 collision object 67 movement vector 69 triangular patch (polygonal patch)
125 recording medium N normal vector

Claims (9)

Information processing device
A reference point setting processing unit for setting one or more reference points for a deformable deformable object,
A control point setting processing unit for setting a plurality of control points for the deformed object,
A weight amount setting processing unit that associates at least one reference point with the control point, and sets a weight amount representing the degree of association for each of the associated reference points.
A target position calculation processor that calculates the first target position of the control point based on the first current position of the reference point associated with the control point and the weight amount;
A control point update processing unit for updating the second current position of the control point so as to approach the first target position;
An image generation processing unit configured to generate an image representing the shape of the deformable object based on the second current position;
An image generation program that functions as a computer program. The information processing apparatus;
A collision determination processing unit that determines whether or not the second current position of the control point is located inside a collision object that collides with the deformed object;
It is determined that the second current position is located inside the collision object, and the second target position of the display position of the control point in the collision state is set to the second current position and the collision object closest to the control point. A display target position calculation processing unit for calculating based on the distance to the surface and the normal vector of the control point;
Further function as a first display position update processing unit that updates the display position of the control point in the collision state so as to approach the second target position,
The image generation processing unit
The image generation program according to claim 1, wherein the image representing the shape of the deformed object is generated based on the display position of the control point in the collision state. The information processing apparatus;
A movement amount calculation processing unit that calculates a movement vector representing a movement amount of the collision object from the time when the collision object started to collide with the deformed object to the current time during the collision;
A first coefficient setting processing unit for setting a first coefficient in the direction of the movement vector;
A second coefficient setting processing unit for setting a reference direction vector representing a reference direction different from the normal vector and a second coefficient in the reference direction;
A second display position for updating the display position of the control point in the non-collision state other than the control point in the collision state based on the movement vector, the first coefficient, the reference direction vector, and the second coefficient. Further function as an update processor,
The image generation processing unit
The image generation program according to claim 2, wherein the image representing the shape of the deformed object is generated based on the display position of the control point in the non-collision state. The information processing apparatus;
A third coefficient setting processing unit that sets an upward vector representing an upward direction in the world coordinate system of the virtual space in which the deformed object exists and a third coefficient in the upward direction;
The second display position update processing unit includes:
The image generation program according to claim 3, wherein the display position of the control point in the non-collision state is updated based on the upward vector and the third coefficient. The information processing apparatus;
A patch setting processing unit that sets a polygonal patch between the control points adjacent to each control point existing in an outer layer among the plurality of control points set for the deformed object; Make it work
The collision determination processing unit
Determining whether or not the polygonal patch of one of the deformed objects and the control point of another deformed object pass through;
The information processing apparatus;
When it is determined that the polygonal patch and the control point are penetrating, the display position of the control point of the one deformed object and the other are set so that the penetrating state is eliminated. Further function as a third display position update processing unit for updating the display position of the control point of the deformed object,
The image generation processing unit
5. The image generation program according to claim 2, wherein the image representing the shapes of the one deformable object and the other deformable object is generated based on the display position. The information processing apparatus;
An initial distance setting processing unit configured to set an initial distance between the control points and a plurality of adjacent control points in an initial state in which the collision does not occur;
A distance constraint processing unit that restrains the distance between the display positions so that the distance between the display positions of the control points in the state where the collision occurs approximates the initial distance;
The image generation program according to any one of claims 2 to 5, further functioning as:   The image generation program according to claim 1, wherein the image generation program is a game program.   A recording medium readable by an information processing apparatus, on which the image generation program according to any one of claims 1 to 7 is recorded. An image generation method executed by an information processing apparatus,
Setting one or more reference points for the deformable deformable object;
Setting a plurality of control points for the deformed object;
Associating at least one reference point with the control point, and setting a weight amount representing a degree of association for each of the associated reference points;
Calculating a first target position of the control point based on a first current position of the reference point associated with the control point and the weight amount;
Updating the second current position of the control point so as to approach the first target position;
Generating an image representing the shape of the deformed object based on the second current position;
An image generation method.

Images