JP2012252399A - Program, information storage medium, information processing system, and information processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase variations of expressions of moving objects placed in a virtual space.SOLUTION: An object placement managing unit 44 changes a position or a direction of a virtual object on the basis of a value of a parameter associated with a physical quantity that is an attribute of the virtual object. The object placement managing unit 44 determines a change, which corresponds to an operation received from a user, in a first physical quantity of the virtual object. The object placement managing unit 44 determines a change in a second physical quantity. The second change corresponds to and is different from the determined change in the first physical quantity. The object placement managing unit 44 changes a value of a parameter on the basis of the change in the first physical quantity and the change in the second physical quantity. The object placement managing unit 44 changes, after the value of the parameter is changed, the position or the direction of the virtual object on the basis of the changed value of the parameter.

Description

  The present invention relates to a program, an information storage medium, an information processing system, and an information processing method.

  There is an information processing system that sequentially generates a frame image representing a state in which an object placed in a virtual space is viewed from a viewpoint position and a line-of-sight direction placed in the virtual space, and displays the frame image on a display device. In addition, there is an information processing system that uses a physics engine, which is software that simulates physical laws such as the laws of classical mechanics, to increase the reality of the movement of objects placed in a virtual space.

  In general, a physics engine is a parameter that represents a physical quantity (for example, position, orientation, mass, moment of inertia, velocity, angular velocity, etc.) set for each object at a certain point in time, a physical quantity related to the entire virtual space (eg, , The position and orientation of each object after a predetermined time has elapsed based on the value of the parameter representing the wind speed).

  There is also known an information processing system that can move an object arranged in a virtual space according to an input amount of an operation input by a user such as a controller.

  In physics simulation processing by a physics engine, objects arranged in a virtual space basically move according to the laws of classical mechanics. However, for example, in a computer game where the character object is grabbed and moved by a linear object such as a rope or chain, the mass of the portion where the character object is grabbed is made heavier than the mass of other portions, In a direction different from the direction in which you want to move the object, the movement of the object that violates the laws of physics, such as making the linear object shake faster, is a representation of how the character object moves. May rather be desirable.

  In this way, in a situation where processing (for example, physical simulation using a physics engine) that changes the position or orientation of an object based on the value of a parameter associated with a physical quantity that is an attribute of the object is executed, the physical laws are It is expected that the variation of the expression of how the object moves can be expanded by setting the parameter value flexibly regardless of the exact reproduction.

  The present invention has been made in view of the above problems, and one of its purposes is to widen variations in the expression of how objects arranged in a virtual space move.

  In order to solve the above problems, a program according to the present invention is a program that causes a computer to function as an information processing system that controls movement of an object placed in a virtual space, and is placed in the virtual space. Based on the value of the parameter associated with the physical quantity that is the attribute of the object to be moved, object changing means for changing the position or orientation of the object to be moved, the object to be moved according to the operation received from the user A first change determining means for determining a change in physical quantity; a second change determining means for determining a change in physical quantity different from the change according to a change determined by the first change determining means; The change of the physical quantity specified by the change determination means and the second change determination means The computer functions as a value changing unit that changes the value of the parameter based on a change in the logic, and the object changing unit changes the parameter value after the change by the value changing unit. The position or orientation of the object to be moved is changed based on a parameter value.

  An information storage medium according to the present invention is a computer-readable information storage medium storing a program that causes a computer to function as an information processing system that controls movement of an object arranged in the virtual space. Based on the value of the parameter associated with the physical quantity that is the attribute of the object to be moved arranged in the object, the object changing means for changing the position or orientation of the object to be moved, according to the operation received from the user, First change determining means for determining a change in physical quantity of the object to be moved, and a second change for determining a change in physical quantity different from the change according to the change determined by the first change determining means. Determining means, a change in physical quantity determined by the first change determining means, and the second The computer functions as a value changing unit that changes the value of the parameter based on a change in physical quantity determined by the change determining unit, and the object changing unit changes the parameter value by the value changing unit. The latter is a computer-readable information storage medium storing a program characterized in that the position or orientation of the object to be moved is changed based on the changed parameter value.

  The information processing system according to the present invention is an information processing system that controls the movement of an object arranged in a virtual space, and has a physical quantity that is an attribute of the object to be moved arranged in the virtual space. Based on the value of the associated parameter, an object changing unit that changes the position or orientation of the object to be moved, and a first change that determines a change in physical quantity of the object to be moved according to an operation received from a user. A change determining means, a second change determining means for determining a change in a physical quantity different from the change according to the change determined by the first change determining means, and the first change determining means. The value of the parameter is changed based on the change of the physical quantity to be changed and the change of the physical quantity determined by the second change determining means. The object changing means changes the position or orientation of the object to be moved based on the changed parameter value after the parameter value is changed by the value changing means. It is characterized by that.

  The information processing method according to the present invention is an information processing method for controlling the movement of an object arranged in a virtual space, and is a physical quantity that is an attribute of the object to be moved arranged in the virtual space. Based on the value of the associated parameter, the first object changing step for changing the position or orientation of the object to be moved and the change in the physical quantity of the object to be moved according to the operation received from the user are determined. A first change determining step; a second change determining step for determining a change in a physical quantity different from the change according to the change determined in the first change determining step; and the first change determining step. Based on the change in the physical quantity determined by and the change in the physical quantity determined by the second change determination step, A value changing step for changing the value of the parameter, and a second value for changing the position or orientation of the object to be moved based on the changed parameter value after the parameter value is changed by the value changing step. An object changing step.

  According to the present invention, not only the change in the physical quantity of the object to be moved according to the operation received from the user, but also the change in the physical quantity associated with the change in the physical quantity in the predetermined correspondence rule is Since this is reflected in a change in the position or orientation of the object, it is possible to expand the variation of the expression of how the object arranged in the virtual space moves.

  In one aspect of the present invention, the first change determining means determines a change in the speed or angular velocity of the object to be moved in a specific direction, and the second change determining means is different from the specific direction. It is characterized in that the change in the direction velocity or angular velocity is determined.

  In the aspect of the invention, when the first change determination unit determines an increase in the speed or angular velocity of the object to be moved in a specific direction, the second change determination unit It is characterized by determining a decrease in velocity or angular velocity in a direction different from the direction.

  In the aspect of the invention, the first change determining unit may determine a change in force applied to at least one of the objects to be moved including a plurality of elements, and The two change determining means determines a change in mass or moment of inertia of at least one of the elements.

  In one aspect of the present invention, the second change determining means determines an increase in mass or moment of inertia for at least one element for which a change in force is determined, and for at least one of the remaining elements. Is characterized by determining the decrease in mass or moment of inertia.

  In one aspect of the present invention, the second change determining means determines an increase in mass or moment of inertia for at least one element for which a change in force is determined by the first change determining means, For all remaining elements, it is characterized by determining the reduction in mass or moment of inertia.

  In one aspect of the present invention, the object changing means changes the position or orientation of the object to be moved based on the values of a plurality of parameters each associated with the mass or moment of inertia of each element, The value changing means changes the value of a parameter associated with the mass or moment of inertia of the element whose increase or decrease in mass or moment of inertia is determined by the second change determining means.

  In one aspect of the present invention, the image processing device further includes image generation means for generating an image representing a state in which the virtual space in which the object is arranged is viewed from a viewpoint set in the virtual space. To do.

It is a lineblock diagram of the game device concerning one embodiment of the present invention. It is a figure which shows an example of the virtual space constructed | assembled with the game device which concerns on one Embodiment of this invention. It is a functional block diagram which shows an example of the function implement | achieved with the game device which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the flow of the process performed every frame with the game device which concerns on one Embodiment of this invention. It is a figure which shows an example of a mode that the player object was caught by the rigid body object. It is a figure which shows an example of a mode that the chain object which lie down on a floor object.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram of a game apparatus 10 that functions as an information processing system according to an embodiment of the present invention. The game device 10 according to the present embodiment is, for example, a game console, a portable game terminal, a personal computer, or the like. As shown in FIG. 1, the game apparatus 10 according to the present embodiment includes a control unit 12, a storage unit 14, an operation unit 16, and a display unit 18.

  The control unit 12 is a program control device such as a CPU that operates according to a program installed in the game apparatus 10. The storage unit 14 is a storage element such as a ROM or a RAM, a hard disk drive, or the like. The operation unit 16 is a keyboard, a mouse, a controller of a consumer game machine, or the like, and receives a user operation input and outputs a signal indicating the content to the control unit 12. The display unit 18 is a display device such as a liquid crystal display, and displays various images in accordance with instructions from the control unit 12.

  Note that the game apparatus 10 may include a communication interface such as a network board, an optical disk drive that reads an optical disk such as a DVD-ROM or a Blu-ray (registered trademark) disk, a USB (Universal Serial Bus) port, and the like.

  The game apparatus 10 according to the present embodiment is configured to construct a virtual space 20 illustrated in FIG. 2 on a memory by executing a program to which the present invention is applied. As shown in the figure, the virtual space 20 according to the present embodiment is a virtual three-dimensional space, and virtual objects such as a player object 22, a chain object 24, a ceiling object 26, and a floor object 28 are arranged together with a viewpoint 30. ing.

  In this embodiment, the virtual object is composed of a plurality of polygons. A texture is mapped to each polygon. In the present embodiment, the user of the game apparatus 10 can move the player object 22 in the virtual space 20 by operating the operation unit 16.

  Further, in the program executed by the game apparatus 10 according to the present embodiment, a function of a physics engine that simulates a physical law such as a law of classical mechanics is realized.

  In the present embodiment, for example, when the user operates the operation unit 16, the player object 22 is held by the chain object 24, the player object 22 moves away from the chain object 24, the player object 22 shakes the chain object 24, and the player object 22. An action such as rotating the chain object 24 can be realized.

  FIG. 3 is a functional block diagram of the game apparatus 10 according to the present embodiment. As shown in FIG. 3, the game apparatus 10 functionally includes a data storage unit 40, an operation state acquisition unit 42, an object arrangement management unit 44, and a spatial image generation output unit 46. The data storage unit 40 is realized mainly by the storage unit 14, and the other elements are realized mainly by the control unit 12.

  These functions are realized by executing the program according to the present embodiment on the game apparatus 10 that is an information processing system. This program may be downloaded from another computer via a communication interface via a computer communication network, or may be a computer-readable information storage medium such as an optical disk (for example, CD-ROM or DVD-ROM) or USB memory. May be installed in the game apparatus 10 via an optical disk drive, a USB (Universal Serial Bus) port, or the like.

  In the present embodiment, various data necessary for constructing the virtual space 20 are stored in the data storage unit 40 in advance. The data storage unit 40 stores, for example, polygon data and texture data related to a virtual object arranged in the virtual space 20. For example, as shown in FIG. 2, the chain object 24 includes a plurality of rigid objects 24 a and joints 24 b that connect the rigid objects 24 a to each other and the rigid objects 24 a and the ceiling object 26. In the present embodiment, the rigid object 24a has a cylindrical shape. In this embodiment, one end of the chain object 24 is a fixed end connected to the ceiling object 26, and the other end is a free end.

  In the present embodiment, the physical quantity (for example, size, mass, moment of inertia (inertial tensor in this embodiment), velocity, angular velocity, maximum velocity, maximum angular velocity, and the like for each rigid object 24a is stored in the data storage unit 40. A parameter value representing an impulse value (a value representing impulse) or the like is stored. In the present embodiment, the same value is set in advance for the mass parameter of each rigid object 24a. The same value is set for the inertia moment parameter of each rigid object 24a. These values can be changed according to the progress of the game.

  In the present embodiment, the data storage unit 40 stores, for each joint 24b, the positional relationship between the rigid objects 24a connected to the joint 24b and the rigid object 24a and the ceiling object 26 connected to the joint 24b. (For example, the maximum angle of rotation about the axis, the maximum angle formed by the axes of the rigid object 24a, and the like) are also stored. In the present embodiment, a physical simulation process is executed so that this constraint condition is satisfied.

  In the present embodiment, the data storage unit 40 also stores control necessity information that is a flag indicating whether or not each rigid body object 24a is a target of physical simulation processing. In the present embodiment, the data storage unit 40 indicates correspondence rules between the first physical quantity for the virtual object and the second physical quantity that is changed according to the change when the first physical quantity is changed. Corresponding rule data is also stored. In the present embodiment, the correspondence rule data also includes data indicating whether the second physical quantity is changed in the pre-processing described later or whether the second physical quantity is changed in the post-processing described later. How the control necessity information and the correspondence rule data are used in the process will be described later.

  In the present embodiment, an image (hereinafter referred to as a space frame image) representing a state in which the spatial image generation / output unit 46 viewed the viewing direction from the viewpoint 30 arranged in the virtual space 20 is referred to as a predetermined time (for example, , 1/60 seconds) at intervals, and displayed on the display unit 18.

  Here, an example of a flow of processing performed every frame (for example, performed at 1/60 second intervals) in the game apparatus 10 according to the present embodiment will be described with reference to a flowchart illustrated in FIG.

  In the present processing example, an increase in force on the rigid object 24a is set as the first physical quantity, and an increase in mass for the rigid object 24a is set as the second physical quantity, as well as other included in the chain object 24. It is assumed that correspondence rule data in which mass reduction is set for all the rigid objects 24 a is stored in the data storage unit 40. Further, in this correspondence rule data, a change amount of mass with respect to a unit increase amount of force is also set. The correspondence rule data also indicates that the mass of the rigid object 24a is changed in the preprocessing.

  In this processing example, for example, an increase in speed in a specific direction of the chain object 24 is set as the first physical quantity, and a direction other than the above-described specific direction of the chain object 24 is set as the second physical quantity. It is assumed that the corresponding rule data in which the speed reduction is set is also stored in the data storage unit 40. In the correspondence rule data, a damping coefficient (a reduction rate of 0 or more and less than 1) when the speed is reduced is set. The correspondence rule data also indicates that speed reduction is performed in post-processing.

  First, the operation state acquisition unit 42 acquires the operation state of the operation unit 16 (specifically, for example, the type of button being pressed and the amount of button press) (S101). Then, the object arrangement management unit 44 determines the action of the player object 22 and the parameter value related to the action based on the acquired operation state (S102). Here, for example, it is assumed that an action in which the player object 22 is held by any rigid body object 24a is determined. It is also assumed that the value of a force parameter representing the force applied to the rigid object 24a by the grabbing motion is determined.

  Then, the object arrangement management unit 44 sets all the rigid objects 24a to be the targets of the physical simulation process when all the rigid objects 24a are not the targets of the physical simulation process and satisfy a predetermined condition. The value of the control necessity information is updated (S103). For example, when the distance from the player object 22 is less than or equal to a predetermined distance for any rigid object 24a or when the player object 22 is held by any rigid object 24a, the object arrangement management unit 44 The value of the control necessity information is updated so that the rigid object 24a becomes a target of the physical simulation process.

  Then, the object arrangement management unit 44 acquires the control necessity information stored in the data storage unit 40, specifies the rigid body object 24a that is the target of the physical simulation process, and the rigid body object that is the target of the physical simulation process. The value of the parameter representing the physical quantity set to 24a is acquired (S104). Here, for example, the value of the velocity parameter set in each rigid body object 24a (in this embodiment, the value of the velocity parameter is represented by a three-dimensional vector), the value of the angular velocity parameter, and each rigid object A value indicating the position and orientation of 24a is acquired. Then, based on the action determined in the process shown in S102, the value of the parameter related to the action, and the corresponding rule data indicated to change the second physical quantity in the pre-process, the object arrangement management unit 44 Then, pre-processing for performing the physical simulation processing is executed (S105). In the process in the frame in which the action that the player object 22 is held by any rigid body object 24a occurs, the object arrangement management unit 44, for example, sets the mass parameter set for the rigid object 24a where the player object 22 is held. While increasing the value, the value of the set mass parameter is decreased for all the other rigid objects 24a included in the chain object 24. Here, the amount of increase or decrease in the value of the mass parameter is determined based on the value of the force parameter representing the force applied to the rigid object 24a when the player object 22 is grasped based on the correspondence rule data. Is done.

  Then, the object arrangement management unit 44 executes a physical simulation process based on the parameter value set for each rigid object 24a and the force parameter value determined in the process shown in S102 described above, The position and orientation of each rigid body object 24a are changed, and the parameter values set for each rigid object 24a are changed (S106).

  In the present embodiment, the physical simulation process shown in S106 is executed using a function of a known physics engine. In the known physics engine, for example, the value of the mass parameter, the value of the moment of inertia parameter, the value of the velocity parameter, the value of the angular velocity parameter, the position and orientation of each rigid object 24a set to each rigid body object 24a, By inputting the value of the force parameter determined by the processing shown and the constraint condition by the joint 24b, the value of the velocity parameter, the value of the angular velocity parameter, and the value of each rigid body object 24a, which are physical simulation results, are obtained. Will be output.

  Here, as in the chain object 24 according to the present embodiment, when the rigid body object 24a is connected by the joint 24b in which the constraint condition is set, for example, the temporary position, the temporary direction, and the temporary speed. The accuracy of the physical simulation is improved by repeating the process of sequentially executing the process of determining the parameter value and the provisional angular velocity parameter value for all the rigid objects 24a. However, since there is a limit to the processing that can be performed within a time corresponding to one frame, in the present embodiment, when the sequential execution processing for all the rigid objects 24a is repeated a predetermined number of times, the processing is stopped at that point, and at that time The temporary velocity parameter value, the temporary angular velocity parameter, and the temporary orientation are determined as the final velocity parameter value, the angular velocity parameter value, and the orientation, and the rigid body object 24a at the fixed end is sequentially connected between the rigid body objects 24a. The position of each rigid body object 24a is adjusted so that the length of the object becomes a predetermined length.

  Then, the object arrangement management unit 44 executes post-processing for additionally changing the parameter value set for each rigid object 24a in accordance with the result of the physical simulation processing shown in S106 (S107). Specifically, for example, as shown in FIG. 5, the player object 22 applies a force in the positive X-axis direction (that is, the player object 22 tries to advance in the positive X-axis direction), and the X-axis direction of the chain object 24 When the velocity Vx increases, the object arrangement management unit 44 determines the velocity parameter value Vy in the Y-axis direction that is perpendicular to the X-axis direction and the Z-axis direction that is also perpendicular to the X-axis direction. Is multiplied by a damping coefficient set in the corresponding rule data.

  Then, the object arrangement management unit 44 has an absolute value of the set speed parameter value equal to or smaller than a predetermined threshold (exclusion threshold speed), and an absolute value of the set angular speed parameter value is a predetermined threshold (exclusion threshold angular speed). ) The following number of rigid objects 24a is specified (S108). Hereinafter, the number of rigid objects 24a specified in this way is referred to as a specific object number.

  Then, the object arrangement management unit 44 continues for a predetermined number of frames (for example, 3 frames) or more and confirms whether the specific object number is a predetermined number (for example, 3) or more (S109). If so (S109: Y), the value of the control necessity information is updated so that all the rigid objects 24a included in the chain object 24 are excluded from the targets of the physical simulation process (S110).

  If not (S109: N), or after the processing shown in S110 is completed, the spatial image generation / output unit 46 generates a spatial frame image that represents the viewing direction from the viewpoint 30 and displays it on the display unit 18. Output (S111), and the processing shown in this processing example is terminated.

  In the present embodiment, while the player object 22 is grasped by the chain object 24 and the chain object 24 is being shaken, the value of the mass parameter of the rigid object 24a being grasped is larger than the value of the mass parameter of the other rigid object 24a. The state continues. For example, when the user performs an operation of releasing the chain object 24 from the player object 22, the player object 22 is separated from the chain object 24 and thrown out. At this time, the object arrangement management unit 44 returns the value of the mass parameter of each rigid body object 24a to a preset initial value. That is, the same value is set for the mass parameter of each rigid object 24a.

  Further, the object arrangement management unit 44 performs all rigid bodies included in the chain object 24 after the player object 22 performs the operation of releasing the chain object 24 until the entire chain object 24 is excluded from the target of the physical simulation process. The object 24 a is multiplied by a damping coefficient (0 or more and less than 1) for a scene where the player object 22 is away from the chain object 24. In the present embodiment, the value of the damping coefficient is set in advance and stored in the data storage unit 40. Note that this damping coefficient is set to a different value in the direction in which the player object 22 is going to advance (for example, the X-axis direction) and in other directions (for example, the Y-axis direction and the Z-axis direction). Also good. For example, the value of the damping coefficient in the X-axis direction may be set smaller than the value of the damping coefficient in the Y-axis direction, and may be set smaller than the value of the damping coefficient in the Z-axis direction. In this way, in this embodiment, the convergence of the shaking of the chain object 24 after the player object 22 leaves the chain object 24 can be accelerated.

  In the present embodiment, for example, in the process shown in S105, the value of the mass parameter set for the rigid body object 24a in which the player object 22 is held is increased, and the value of the mass parameter set for the other rigid body object 24a is increased. As a result, the chain object 24 is more likely to sway than when the mass parameter values of the rigid objects 24a are the same. As described above, by changing the value of the mass parameter by the process shown in S105, it is possible to realize image representation more suitable for the game than when the physics engine is faithfully reproduced by the physics engine.

  In the present embodiment, for example, in the processing shown in S107, the object arrangement management unit 44 multiplies the speed parameter values in the Y-axis direction and the Z-axis direction by the damping coefficient set in the corresponding rule data. Thus, the swing of the chain object 24 converges faster in directions other than the X-axis direction in which the player object 22 is going to advance, compared to the case where this is not done. Further, even when the traveling direction is changed while the player object 22 is held by the chain object 24, the chain object 24 can be prevented from making a circular motion, and the player object 22 can move in the direction in which the player object 22 tends to travel. An image representation of the shaking of the chain object 24 along can be realized.

  As described above, in the present embodiment, not only the change in the physical quantity of the rigid body object 24a according to the operation received from the user but also the change in the physical quantity of the rigid body object 24a associated with the change in the physical quantity in the correspondence rule data Since it is reflected in the change in the position and orientation of 24a, the expression of how the rigid body object 24a moves is simply compared with the case where the physical laws are faithfully reproduced by the physics engine while utilizing the functions of the physics engine. The range of variations will expand.

  In this embodiment, in a certain frame, the absolute value of the set speed parameter value is less than or equal to a predetermined threshold (exclusion threshold speed), and the absolute value of the set angular speed parameter value is a predetermined threshold (exclusion). The rigid object 24a that is equal to or less than the threshold angular velocity is specified as the specific object number. Further, when the number of specific objects is continuously a predetermined number of frames or more (in this embodiment, for example, when it is determined that the number of specific objects is equal to or more than a predetermined number of times three or more times), a chain object 24 is excluded from the target of the physical simulation process. As a result, in the present embodiment, there is a situation in which the remaining rigid object 24a is the target of the physical simulation process even though some of the rigid object 24a is excluded from the target of the physical simulation process. Can be prevented. As a result, in the present embodiment, it is possible to reduce the possibility that the motion expression of the chain object 24 becomes unnatural (for example, the chain object 24 vibrates unnaturally). In addition, since the number of virtual objects to be subjected to the physical simulation process can be reduced earlier than in the case where the above is not performed, the load of the physical simulation process can be reduced. As a result, it is possible to prevent the information processing load on the game apparatus 10 from increasing.

  In addition, this invention is not limited to the above-mentioned embodiment.

  For example, the manner in which the lying chain object 24 jumps on the floor object 28 as shown in FIG. Here, it is assumed that the floor object 28 is stationary and is set so that its position and orientation do not change even when the chain object 24 collides. In addition, a value of a restitution coefficient parameter indicating a restitution coefficient in the relationship with the floor object 28 is set in the rigid object 24a, and the value of the restitution coefficient parameter is input to the physics engine in the physical simulation process.

  Here, for example, when the second rigid object 24a from the left in FIG. 6 collides with the floor object 28, the relative speed Vr of the rigid object 24a with respect to the floor object 28 (in this embodiment, the floor object 28 is stationary). Therefore, the absolute value of the velocity parameter of the rigid object 24a coincides with a predetermined second threshold value (this threshold value is hereinafter referred to as the first threshold value) in the process shown in S108 described above. In the case of the following, the object arrangement management unit 44 multiplies the value of the restitution coefficient parameter by a damping coefficient (0 or more and less than 1) stored in the data storage unit 40 that is set in advance for the restitution coefficient. It may be. In this way, with respect to the rigid object 24a, the absolute value of the velocity parameter when the rigid object 24a moves away from the floor object 28, and the change in position and orientation per unit time, compared to the case where the value of the coefficient of restitution coefficient is not updated. The amount becomes smaller. By doing so, it is possible to prevent a situation in which the rigid body object 24a does not stop on the floor object 28 due to the influence of the rounding error. In addition, the absolute value of the relative velocity with respect to the floor object 28 becomes equal to or lower than the first threshold earlier than when the value of the coefficient of restitution coefficient is not updated, and the physical simulation process is not performed. In this way, the number of virtual objects to be subjected to the physical simulation process can be reduced earlier than when the value of the restitution coefficient parameter is not updated, and as a result, the load of the physical simulation process can be reduced.

  Also in this case, the object placement management unit 44 determines that the chain object 24 is in a case where the number of specific objects is continuously a predetermined number (for example, 3) or more over a predetermined number of frames (for example, 3 frames) or more. May be excluded from the target of the physical simulation process.

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

  For example, in the process shown in S107, the object arrangement management unit 44 further changes the value of the parameter (for example, the velocity Vx in the X-axis direction) whose value was changed in the process shown in S106 in the process shown in S107. May be.

  Further, for example, in the processing shown in S108, the object placement management unit 44 determines that the absolute value of the speed parameter value set continuously for a predetermined number of frames (for example, 2 frames) is equal to or less than the exclusion threshold speed. The number of rigid objects 24a whose absolute value of the angular velocity parameter value is equal to or less than the exclusion threshold angular velocity may be specified as the specific object number.

  Further, for example, in the processing shown in S108, the object placement management unit 44 determines that the absolute value of the set speed parameter value is equal to or less than the exclusion threshold speed, and the absolute value of the set angular speed parameter value is equal to or less than the exclusion threshold angular speed. For example, the number of rigid objects 24a whose absolute value of the set speed parameter value is equal to or less than the exclusion threshold speed is specified as the number of specific objects. Alternatively, the number of rigid objects 24a whose absolute value of the set angular velocity parameter value is equal to or less than the exclusion threshold angular velocity may be specified as the specific object number. Further, it is not necessary for the game apparatus 10 to control whether or not to remove all the rigid objects 24a from the target of the physical simulation according to the comparison result between the specific object number and the predetermined value. For example, depending on whether or not the difference between the maximum value and the minimum value of the parameter values set for each rigid object 24a is equal to or less than a predetermined value, the game apparatus 10 applies all the rigid objects 24a to the target of the physical simulation. You may make it control whether it removes from.

  Further, for example, in the processing shown in S109 and S110, a predetermined value is used for controlling whether or not to update the value of the control necessity information so that all the rigid objects 24a included in the chain object 24 are excluded from the physical simulation processing targets. Instead of the number of rigid objects 24a continuously specified as described above for the number of frames, the number of rigid objects 24a included in the chain object 24 is specified as described above continuously for a predetermined number of frames or more. A ratio (for example, 50%) of the number of rigid body objects 24a to be used may be used.

  Further, for example, an increase in angular velocity in a specific rotation direction of the chain object 24 is set as the first physical quantity, and a decrease in angular velocity in the other rotation directions of the chain object 24 is set as the second physical quantity. The corresponding rule data may be stored in the data storage unit 40. In the correspondence rule data, for example, a damping coefficient (0 or more and less than 1) when the angular velocity is reduced is set, and it is also shown that the angular velocity of the rigid object 24a is reduced in the post-processing. Yes. Then, for example, in the process shown in S107, the object placement management unit 44 uses the angular velocity parameter for the rotation direction different from the traveling direction of the player object 22 or the rotation direction in which the player object 22 rotates the chain object 24. May be multiplied by a damping coefficient set in the corresponding rule data. In this way, the rotation of the chain object 24 converges quickly in a rotation direction different from the rotation direction in which the player object 22 is to rotate.

  Further, for example, the correspondence rule data may indicate both an increase or decrease in velocity and an increase or decrease in angular velocity as the first physical quantity. Further, for example, as the second physical quantity, both increase or decrease in velocity and increase or decrease in angular velocity may be indicated. Then, both the speed change and the angular speed change may be executed in the process shown in S107.

  Further, for example, the correspondence rule data includes an increase in mass for the rigid body object 24a and a mass for a part of the rigid body object 24a that is different from the rigid body object 24a included in the chain object 24 (for example, two before and after). Decrease may be set. Then, the object arrangement management unit 44 may decrease the value of the mass parameter of the two rigid objects 24a before and after the rigid object 24a with which the player object 22 is grasped in the process shown in S105.

  Further, for example, as the first physical quantity, an increase in torque with respect to the rigid body object 24a is set, and as the second physical quantity, an increase in inertia moment with respect to the rigid body object 24a, as well as with respect to other rigid body objects 24a. Corresponding rule data in which a decrease in the moment of inertia is set may be stored in the data storage unit 40. Then, the object placement management unit 44 shows the relationship between the determined torque parameter value, the torque increase amount, and the change amount of the inertia moment as the inertia moment parameter set for each rigid object 24a. You may make it change based on rule data. Then, the object placement management unit 44 inputs the torque parameter value to the physics engine, thereby changing the position and orientation of each rigid body object 24a and changing the values of various parameters set in each rigid body object 24a. May be performed.

  In addition, for example, in the above-described embodiment, the process executed in the pre-processing may be executed in the post-processing, or the process executed in the post-processing may be executed in the pre-processing. Specifically, for example, the mass parameter is increased / decreased in the post-processing in the frame in which the action that the player object 22 is held by any rigid body object 24a occurs, and in the physical simulation processing in the next frame and thereafter, the mass The increase or decrease of the parameter may be reflected.

  Further, for example, the value of the mass parameter may be changed according to a change in the speed of the rigid object 24a. For example, as the second physical quantity indicated by the correspondence rule data, for example, a change in physical quantity (for example, wind speed) related to the entire virtual space 20 may be set.

  Further, the present embodiment may be applied to an information processing system (for example, a simulation system or an image processing system) other than the game apparatus 10. Moreover, the specific numerical values and character strings described above and the specific numerical values and character strings in the drawings are examples, and are not limited to these numerical values and character strings.

  10 game devices, 12 control units, 14 storage units, 16 operation units, 18 display units, 20 virtual spaces, 22 player objects, 24 chain objects, 24a rigid objects, 24b joints, 26 ceiling objects, 28 floor objects, 30 viewpoints, 40 data storage unit, 42 operation state acquisition unit, 44 object arrangement management unit, 46 spatial image generation output unit.

Claims (11)

A program that causes a computer to function as an information processing system that controls the movement of an object arranged in a virtual space,
Object changing means for changing the position or orientation of the object to be moved based on the value of a parameter associated with a physical quantity that is an attribute of the object to be moved arranged in the virtual space;
First change determining means for determining a change in physical quantity of the object to be moved in response to an operation received from a user;
Second change determining means for determining a change in physical quantity different from the change in accordance with the change determined by the first change determining means;
The computer as a value changing means for changing the value of the parameter based on a change in physical quantity specified by the first change determining means and a change in physical quantity specified by the second change determining means. Function
The object changing means changes the position or orientation of the object to be moved based on the changed parameter value after the value of the parameter is changed by the value changing means.
A program characterized by that. The first change determining means determines a change in speed or angular velocity of the object to be moved in a specific direction,
The second change determining means determines a change in velocity or angular velocity in a direction different from the specific direction;
The program according to claim 1. When the first change determining means determines an increase in the speed or angular velocity of the object to be moved in a specific direction, the second change determining means is a speed or angular speed in a direction different from the specific direction. Determine the decrease in the
The program according to claim 2, wherein: The first change determining means determines a change in force applied to at least one of the objects to be moved, which is composed of a plurality of elements,
The second change determining means determines a change in mass or moment of inertia of at least one of the elements;
The program according to any one of claims 1 to 3, characterized in that: The second change determining means determines an increase in mass or moment of inertia for at least one element for which a change in force is determined, and reduces a mass or moment of inertia for at least one of the remaining elements. decide,
The program according to claim 4. The second change determining means determines an increase in mass or moment of inertia for at least one element for which a change in force is determined by the first change determining means, and for all remaining elements the mass or Determine the decrease in moment of inertia,
The program according to claim 5. The object changing means changes the position or orientation of the object to be moved based on the values of a plurality of parameters each associated with the mass or moment of inertia of each element,
The value changing means changes the value of a parameter associated with the mass or moment of inertia of an element whose increase or decrease in mass or moment of inertia is determined by the second change determining means.
The program according to claim 5 or 6, characterized by the above. Image generation means for generating an image representing a state in which the virtual space in which the object is arranged is viewed from a viewpoint set in the virtual space;
The program according to any one of claims 1 to 7, characterized by: A computer-readable information storage medium storing a program for causing a computer to function as an information processing system for controlling movement of an object arranged in a virtual space,
Object changing means for changing the position or orientation of the object to be moved based on the value of a parameter associated with a physical quantity that is an attribute of the object to be moved arranged in the virtual space;
First change determining means for determining a change in physical quantity of the object to be moved in response to an operation received from a user;
Second change determining means for determining a change in physical quantity different from the change in accordance with the change determined by the first change determining means;
The computer as a value changing means for changing the value of the parameter based on a change in physical quantity determined by the first change determining means and a change in physical quantity determined by the second change determining means. Function
The object changing means changes the position or orientation of the object to be moved based on the changed parameter value after the value of the parameter is changed by the value changing means.
A computer-readable information storage medium storing a program characterized by the above. An information processing system for controlling movement of an object arranged in a virtual space,
Object changing means for changing the position or orientation of the object to be moved based on the value of a parameter associated with a physical quantity that is an attribute of the object to be moved arranged in the virtual space;
First change determining means for determining a change in physical quantity of the object to be moved in response to an operation received from a user;
A second change determining means for determining a change in physical quantity different from the change according to the change determined by the first change determining means;
Value changing means for changing the value of the parameter based on a change in physical quantity determined by the first change determining means and a change in physical quantity determined by the second change determining means,
The object changing means changes the position or orientation of the object to be moved based on the changed parameter value after the value of the parameter is changed by the value changing means.
An information processing system characterized by this. An information processing method for controlling movement of an object arranged in a virtual space,
A first object changing step for changing a position or orientation of the object to be moved based on a value of a parameter associated with a physical quantity that is an attribute of the object to be moved arranged in the virtual space;
A first change determination step for determining a change in physical quantity of the object to be moved in response to an operation received from a user;
A second change determination step for determining a change in a physical quantity different from the change according to the change determined in the first change determination step;
A value changing step for changing a value of the parameter based on a change in the physical quantity determined by the first change determining step and a change in the physical quantity determined by the second change determining step;
A second object changing step for changing the position or orientation of the object to be moved based on the changed parameter value after the parameter value has been changed by the value changing step;
An information processing method comprising:

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