JP7005294B2 - Information processing device, operation control program and operation control method - Google Patents

Description

The present invention relates to an information processing apparatus, an operation control program, and an operation control method.

Inverse kinematics (IK) technology is used to generate animations (see, for example, Patent Document 1). Inverse kinematics gives a combination of root and end to a parent-child relationship bone, and by matching the bone position of the end with the tip of the bone, it enables automatic correction of the posture between them. Further, regarding inverse kinematics (IK), a technique for generating animation by a full-body IK that drives joints of the whole body of a character has been proposed.

Japanese Unexamined Patent Publication No. 2002-175541

However, in the generation of animation using the methods of inverse kinematics and full body IK, the foot is changed based on a predetermined rule. Therefore, for example, when the rule of stepping on the foot after a few seconds is set, the foot is changed after a few seconds even if the posture of the character after the automatic correction is lost. As a result, the movement of the character may become unnatural.

In response to the above problems, one aspect of the present invention is to make the movement of the character smoother.

In order to solve the above problem, according to one aspect, a calculation unit that calculates a region where the character touches the ground and a position of the center of gravity of the character based on the movement of the character, and the calculated character are placed on the ground. A determination unit that determines whether or not to step on the character's foot based on the ground contact area and the position of the center of gravity of the character, and motion control that predicts the character's motion after a predetermined time from the character's current motion. The calculation unit calculates the area where the character touches the ground based on the predicted movement of the character after the predetermined time.
The calculation unit calculates a polygon connecting the outermost points of the contact position of the character's body as a region where the character touches the ground, and the determination unit calculates the predicted position of the center of gravity of the character after the predetermined time. It is determined that the position of the center of gravity on the ground corresponding to is the timing to step on the character's foot when it deviates from the polygonal region, and the character's foot is stepped on based on the movement immediately before the character. When the position of the center of gravity on the ground corresponding to the position of the center of gravity of the character does not deviate from the area of the polygon, it is determined that it is not the timing to step on the foot of the character, and the foot of the character is not stepped on. An information processing device is provided.

According to one aspect, the movement of the character can be performed more smoothly.

The figure which shows an example of the functional structure of the information processing apparatus which concerns on one Embodiment. The figure which shows an example of the hardware composition of the information processing apparatus which concerns on one Embodiment. A flowchart showing an example of a conventional operation control method. The figure for demonstrating the conventional operation control method. The flowchart which shows an example of the operation control method which concerns on 1st Embodiment. The figure for demonstrating the operation control method which concerns on 1st Embodiment. The figure which shows an example of the support polygon which concerns on one Embodiment. The flowchart which shows an example of the operation control method which concerns on 2nd Embodiment. The figure for demonstrating the operation control method which concerns on 2nd Embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the present specification and the drawings, substantially the same configurations are designated by the same reference numerals to omit duplicate explanations.

[Information processing device]
The information processing device 10 according to the embodiment of the present invention has a function of generating an animation using the technology of full body IK, and is a device capable of performing a smoother movement of a character. The information processing device 10 according to the present embodiment can be realized by any electronic device such as a tablet terminal, a personal computer, a smartphone, a mobile phone, a PDA (Personal Digital Assistants), a game device, and a game mobile device. The information processing device 10 may be a wearable display device such as an HMD (Head Mount Display) or an FMD (Face Mount Display).

[Functional configuration of information processing device]
First, an example of the functional configuration of the information processing apparatus 10 according to the present embodiment will be described with reference to FIG. The information processing device 10 according to the present embodiment includes a reception unit 9, a game execution unit 11, an operation control unit 12, a calculation unit 13, a determination unit 14, an image processing unit 15, a sound processing unit 16, a display unit 17, and a sound output unit. It has 18, a communication unit 19, and a storage unit 31.

The reception unit 9 receives operations for the player's game. For example, the reception unit 9 receives an input operation performed by the player for the game by using an input device such as a controller or a stick. For example, the operation for the game includes an operation for operating the player character. In addition, the reception unit 9 receives character information that is a target character that controls the foot change operation of the character, which will be described later. Examples of the target character include a player character and other main characters.

The game execution unit 11 executes a predetermined game by causing the CPU of the information processing device 10 to execute the game processing program 35 stored in the storage unit 31. The motion control unit 12 realizes a function of smoothly performing the stepping motion of the received character by causing the CPU of the information processing apparatus 10 to execute the motion control program 34 stored in the storage unit 31. The motion control unit 12 predicts the motion of the character several seconds after the current motion of the character. The storage unit 31 stores the predicted motion information 33 of the character predicted by the motion control unit 12.

The calculation unit 13 calculates the region where the character touches the ground and the position of the center of gravity of the character based on the movement of the character. The determination unit 14 determines whether or not to step on the foot of the character based on the calculated area where the character touches the ground and the position of the center of gravity of the character.

For example, the calculation unit 13 calculates a region where the character touches the ground based on the movement of the character after a predetermined time predicted based on the prediction movement information 33. For example, the calculation unit 13 calculates a support polygon connecting the outermost positions of body parts such as the character's feet and hands as a region where the character touches the ground. When the position of the center of gravity on the ground corresponding to the position of the center of gravity of the character calculated by the calculation unit 13 deviates from the area of the support polygon, the determination unit 14 determines that the character's foot is stepped on or the character falls. judge. The storage unit 31 stores a threshold value Th32 for determining whether the character performs an operation of stepping on a foot or falling over.

When the game execution unit 11 outputs an image output instruction command, the image processing unit 15 generates an image of the character corresponding to the instruction command and outputs the image to the display unit 17. As a result, the display unit 17 displays an image of the character on the field according to the progress of the game. Further, during the execution of the game, the image processing unit 15 generates an image of the character so as to change the foot of the character according to the result determined by the determination unit 14.

When the game execution unit 11 outputs a sound output instruction command, the sound processing unit 16 generates a sound corresponding to the instruction command and outputs the sound to the sound output unit 18. As a result, the sound output unit 18 outputs sounds such as voices and sound effects according to the progress of the game. The communication unit 19 communicates with an information processing device such as another game device.

[Hardware configuration of information processing device]
Next, an example of the hardware configuration of the information processing apparatus 10 according to the embodiment of the present invention will be described with reference to FIG. The information processing device 10 according to the present embodiment includes a CPU (Central Processing Unit) 21, a ROM (Read Only Memory) 22, a RAM (Random Access Memory) 23, and an HDD (Hard Disk Drive) 24. Further, the information processing apparatus 10 according to the present embodiment has a graphic card 25, an external I / F (interface) 26, a communication I / F27, an input I / F28, a display 29, and a speaker 30. Each part is connected to each other by a bus.

The ROM 22 is a non-volatile semiconductor memory capable of holding stored programs and data even when the power is turned off. The RAM 23 is a volatile semiconductor memory that temporarily holds programs and data. The HDD 24 is a non-volatile storage device for storing programs and data. The programs stored in the HDD 24 include basic software and application software that control the entire information processing apparatus 10. Various databases may be stored in the HDD 24. The threshold value Th32, the predicted operation information 33, the operation control program 34, and the game processing program 35 may be stored in the ROM 22, RAM 23, or HDD 24. Further, these pieces of information may be stored in a storage device on the cloud that can be connected to the information processing device 10 via the network. The function of the storage unit 31 can be realized by a storage device on the cloud that can be connected to the information processing device 10 via the ROM 22, RAM 23, HDD 24, or a network.

The CPU 21 reads a program or data into the RAM 23 and executes the above-mentioned various processes to realize overall control of the information processing apparatus 10 and functions installed in the information processing apparatus 10. Specifically, the function of the game execution unit 11 can be realized by the game processing that the game processing program 35 installed in the information processing apparatus 10 causes the CPU 21 to execute. Further, the functions of the operation control unit 12, the calculation unit 13, and the determination unit 14 can be realized by the operation control process that the operation control program 34 installed in the information processing apparatus 10 causes the CPU 21 to execute.

The external I / F 26 is an interface for connecting the information processing device 10 to the external device. The external device includes a storage medium 26a and the like. As a result, the information processing apparatus 10 reads the data from the storage medium 26a and writes the data to the storage medium 26a via the external I / F 26. Examples of the storage medium 26a include a CD (Compact Disk), a DVD (Digital Versatile Disk), an SD memory card (SD Memory card), a USB memory (Universal Serial Bus memory), and the like.

For example, the information processing apparatus 10 can be equipped with a storage medium 26a in which a game program such as an operation control program 34 and a game processing program 35 is stored. These programs are read by the external I / F 26 and read into the RAM 23.

The CPU 21 processes the above-mentioned various programs read into the RAM 23, and instructs the graphic card 25 to output an image corresponding to the progress of the game. The graphic card 25 performs image processing of a character or the like on a field to be displayed on the screen according to an instruction, and causes the display 29 to draw an image of the character or the like. The frame time of the image output from the graphic card 25 is, for example, 1/30 to 1/60 seconds. The graphic card 25 draws one image in frame units. That is, the image of the frame is drawn 30 to 60 times per second. The function of the image processing unit 15 can be realized by, for example, a graphic card 25.

Further, the CPU 21 processes the above-mentioned various programs read into the RAM 23, and outputs a predetermined sound from the speaker 30 according to the progress of the game. The function of the sound processing unit 16 can be realized, for example, by the CPU 21 executing the above-mentioned various programs read into the RAM 23. The function of the sound output unit 18 can be realized by, for example, the speaker 30.

The display 29 may be equipped with a touch panel. As a result, the input operation can be performed without using the controller 1. In this case, the input information of the touch position detected by the touch panel is stored in the RAM 23, and the CPU 21 may execute various arithmetic processes based on the input information stored in the RAM 23. The function of the display unit 17 may be realized by, for example, the display 29.

The communication I / F 27 is an interface for connecting the information processing device 10 to the network. Further, the communication I / F 27 may have a function of communicating with another game device via a communication unit having an antenna. The function of the communication unit 19 can be realized by, for example, the communication I / F27.

The input I / F 28 is an interface connected to the controller 1. The controller 1 has an operation button 2 and a direction key 3. By operating the operation buttons 2 and the direction keys 3, the player can move the player character in a predetermined direction to perform a predetermined operation such as an attack. The input I / F 28 stores the input information based on the input operation performed by the player using the controller 1 in the RAM 23. The CPU 21 executes various arithmetic processes related to the operation of the player character based on the input information stored in the RAM 23. The function of the reception unit 9 can be realized by, for example, the input I / F 28.

[Conventional operation control method]
Before explaining the character motion control method according to the present embodiment having the configuration described above, an example of the conventional character motion control method will be briefly described with reference to FIGS. 3 and 4. FIG. 3 is a flowchart showing an example of a conventional character motion control method. FIG. 4 is a diagram for explaining a conventional operation control method for a character.

In an example of the conventional character motion control method shown in FIGS. 3 and 4, it is necessary to create design data that defines the character motion in advance. Character design data can be created using inverse kinematics (IK) and full body IK that drives the joints of the character's entire body. In full body IK, the end bones are matched to the specified coordinates, and the postures of other bones are automatically calculated based on the constraints such as the parent-child relationship and the range of motion of the joints. For example, as shown in FIG. 4, when the end (tip) of B3 of the design data is fixed to the specified coordinates, B2 and B1 corresponding to the parent, B4 and the bone B5 of the opposite foot, By automatically calculating the posture of B6 (bone name is provisional) from the constraint conditions, the posture can be automatically corrected.

The design data is data on the bone structure of the character created by the designer during game development. The operation after the design data is corrected by the conventional character operation control method shown in FIG. 3 as an example is the correction data shown by the dotted line.

Briefly with reference to FIG. 3, first, the control unit that executes this process acquires the design data of the character (step S10). Next, the control unit controls to lock both feet of the character (step S12). In the example of FIG. 4, the solid bones B3 and B4 are locked.

Next, the control unit controls to start the movement of the route (reference position of the model) (step S14). The control unit determines whether the set time (for example, several seconds) has elapsed (step S16), and after the set time has elapsed, unlocks the swing leg (step S18). In the example of FIG. 4, at this point, the free leg bone B4 is unlocked, and the foot SL is stepped on to the position of the bone B4 shown by the dotted line. At this point, the support leg is B3.

Next, the control unit determines whether the set time (for example, several seconds) has elapsed (step S20), and after the set time has elapsed, unlocks the support legs (step S22). In the example of FIG. 4, at this point, the bone B3 of the support leg is unlocked, and the foot ML connected to the bone B3 shown by the dotted line is stepped on. After that, the process returns to step S12, and the processes of steps S12 to S22 are repeated. As a result, the posture of the character is automatically corrected.

However, in the conventional technique, the time for unlocking the swing leg and the time for unlocking the support leg are preset. Therefore, even if the posture of the character after the automatic correction is broken, the foot is forcibly changed every time the set time elapses. As a result, the posture and movement of the character may not be in harmony, resulting in unnatural movement.

On the other hand, in the motion control method according to the present embodiment, if the center of gravity of the character's body deviates from the area of the support polygon surrounding the ground contact position of the character's body parts without determining the stepping time in advance. Step on your feet. Hereinafter, the operation control method according to the present embodiment will be described.
<First Embodiment>
[Operation control method according to the first embodiment]
An example of the character motion control method according to the first embodiment will be described with reference to FIGS. 5 to 7. FIG. 5 is a flowchart showing an example of character motion control processing according to the first embodiment. FIG. 6 is a diagram for explaining a character motion control method according to the first embodiment. FIG. 7 is a diagram showing an example of a support polygon according to an embodiment.

When the process of FIG. 5 is started, the reception unit 9 of the information processing apparatus 10 receives the character information to be the target character of the operation control process, and the operation control unit 12 specifies the current operation of the target character ( Step S30). The target character may be specified by the game execution unit 11 before the start of the game or during the execution of the game, or may be specified by the player. Hereinafter, the target character is simply referred to as a "character".

Next, the motion control unit 12 predicts the motion of the character after a few seconds based on the current motion of the identified character (step S32). Here, the predicted operation may be, for example, a few seconds to 10 seconds or more, or may be a time shorter than 2 seconds.

Next, the calculation unit 13 calculates a support polygon connecting the outermost points of the body parts of the character that are in contact with the ground from the predicted movement of the character (step S34).

Referring to FIG. 6 showing an example of motion control and support polygon according to the first embodiment, the dotted line character shown in the examples of FIGS. 6 (a) and 6 (b) is the current motion of the character, and is a solid line. This is an example of the character's behavior predicted from the current behavior of the character. In the predicted character movement, the polygon connecting the outermost points of the foot touching the ground is the support polygon. In FIGS. 6 (a) and 6 (b), the polygon connecting the outermost points of both feet ML and SL is calculated as the support polygon Ar.

However, the support polygon is not limited to the case of calculating based on the ground contact position of the foot ML and SL, and may be a polygon connecting the outermost points of the ground contact position of the character's body parts. For example, in the example shown in FIG. 7, the calculation unit 13 sets the contact positions of the body parts of the character as the outermost points of the two-foot ML and SL that are in contact with the ground, and the two-hand H and both-foot ML that are in contact with the ground. , Calculate the support polygon Ar connecting the outermost points of SL.

In addition to the above example, if the leg is broken, the support polygon is calculated based on the contact position of the character's leg and knee with the ground. For animals with long tails, such as kangaroos, the support polygon may be calculated based on the position of the paw and tail on the ground.

Returning to FIG. 5, the calculation unit 13 then calculates the center of gravity of the character (step S36). As an example of how to calculate the center of gravity of a character, the weight of body parts such as arms and head is preset, and the weight of each body part is multiplied by the position of that part, and the weight of all body parts is calculated. The center of gravity position G is calculated from the multiplication result between the arm and the position of the part. However, the method for calculating the center of gravity of the character is not limited to this, and a known method can be used. For example, the final center of gravity G of the character may be calculated by considering the inertial force in the position G of the center of gravity of the character calculated by the above calculation method.

Next, the determination unit 14 determines whether the center of gravity position GL on the ground with respect to the calculated center of gravity position G is within the region of the support polygon Ar (step S38). The center of gravity position GL is the position on the ground with respect to the calculated center of gravity position G, that is, when the coordinates of the calculated center of gravity position G are indicated by (x, z, y), the center of gravity position GL is the coordinates on the ground (x, It is a position indicated by 0, y).

When the center of gravity position GL on the ground with respect to the calculated center of gravity position G is within the region of the support polygon Ar, the determination unit 14 ends the present process as it is. For example, as in the example of FIG. 6A, when the center of gravity position GL is within the range of the region of the support polygon Ar, the foot of the character is not changed.

On the other hand, when the center of gravity position GL on the ground with respect to the calculated center of gravity position G deviates from the region of the support polygon Ar, the determination unit 14 steps on the character's foot (step S40) and ends this process. For example, when the center of gravity position GL deviates from the region of the support polygon Ar as in the example of FIG. 6B, the foot SL of the support leg B2 of the character is fixed, and the foot of the free leg B1 is fixed to the support leg B2. The ML is stepped on, which causes the foot ML to move to the dotted line position.

In the conventional character motion control, the foot is changed in advance at predetermined time intervals, so that the foot is changed even if the character's body is not out of balance. On the other hand, according to the motion control method according to the present embodiment, the stepping is not performed unless the balance of the character is lost, and the foot of the character is stepped only when the balance is lost. As a result, the movement of the character can be drawn smoothly without being unnatural. As a result, the player can enjoy the game with a more realistic feeling.

Further, according to the motion control method according to the present embodiment, it is determined in real time whether or not the foot stepping motion is performed for the predicted character motion, and the character's foot stepping is performed in real time based on the determination result. I do. Therefore, it is possible to save the trouble of creating a lot of design data for operation in advance. This makes it possible to reduce the development time and maintenance time for creating character animations.
<Second Embodiment>
[Operation control method according to the second embodiment]
Next, an example of the character motion control method according to the second embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a flowchart showing an example of the operation control method according to the second embodiment. FIG. 9 is a diagram for explaining the operation control method according to the second embodiment.

When the process of FIG. 9 is started, the processes of steps S30 to S38 are performed. Since the processing of steps S30 to S38 is the same as the processing of the same step number shown in FIG. 5, the description here will be omitted.

In step S38, the determination unit 14 determines whether the center of gravity position GL on the ground with respect to the calculated center of gravity position G is within the region of the support polygon Ar, and as a result, the center of gravity position GL on the ground is the support polygon Ar. If it is in the area, this process ends as it is.

On the other hand, when the center of gravity position GL on the ground deviates from the region of the support polygon Ar, the determination unit 14 determines whether the center of gravity position GL on the ground is further away from the boundary of the support polygon Ar than the threshold value Th. (Step S42). When the center of gravity position GL on the ground is at a position equal to or less than the threshold value Th from the closest to the region of the support polygon Ar, the determination unit 14 steps on the character's foot (step S40) and ends this process. For example, as in the example of FIG. 9, when the center of gravity position GL1 on the ground, which is an example of the center of gravity position GL, is separated by the distance P1 from the nearest of the center of gravity position GL1 in the region of the support polygon Ar, the distance P1 is When it is equal to or less than the threshold value Th, the foot on the free leg side of the character is changed.

On the other hand, in step S42, the determination unit 14 controls the character to tip over when the center of gravity position GL on the ground is farther than the threshold value Th from the nearest support polygon Ar (step S44), and this process is performed. To finish. For example, as in the example of FIG. 9, when the center of gravity position GL2 on the ground, which is an example of the center of gravity position GL, is separated from the nearest of the center of gravity position GL2 by the distance P2 in the region of the support polygon Ar, the distance P2 is If it is larger than the threshold Th, the character is overturned. In the calculation unit 13, for example, the intersection of the diagonal lines of each vertex is set as the center point O of the support polygon Ar, and the length outside the region of the support polygon Ar on the line from the center point O to the center of gravity position GL on the ground. The length may be obtained and the length may be used as the distance from the center of gravity position GL.

According to the motion control method according to the present embodiment, when the center of gravity position GL on the ground deviates from the region of the supporting polygon Ar, it is determined that the character's body is out of balance, and the foot on the free leg side of the character. Either step on or overturn the character. On the other hand, when the center of gravity position GL on the ground is within the region of the supporting polygon Ar, it is determined that the balance of the character's body is not lost, and the foot is not changed. As a result, it is possible to perform the movement of the character more realistically and smoothly by determining whether or not the character falls or the foot is changed according to the physical condition of the character.

Further, according to the motion control method according to the present embodiment, it is determined in real time whether or not the foot stepping motion is performed for the predicted motion, and the character's foot stepping or falling is performed based on the determination result. .. Therefore, it is possible to save the trouble of creating design data in advance and shorten the development time for creating character animation.

The motion control method according to this embodiment can be used for any character. For example, it can be used for a character of an animal such as a person who walks on two legs or a character of an animal which walks on four legs. It may also be used for multi-legged insect characters.

When the character is bipedal, the determination unit 14 determines whether or not to step on the foot that becomes the free leg with respect to the support leg of the character. On the other hand, when the character is walking on four legs, the determination unit 14 determines whether or not at least one of the forefoot and the hindfoot, which are the swing legs, is stepped on the supporting leg of the character.

Further, the size of the character's feet, hands, etc. is reflected in the area of the support polygon Ar, and the movement speed of the character is reflected in the calculation result of the center of gravity position G and the calculation result of the predicted movement of the character. As a result, by making a real-time determination of whether to step on or fall according to the size and movement speed of the character's body parts, the foot is stepped on at different timings according to the characters with different physiques and movements. By performing the operation of changing or tipping over, a smoother operation can be performed for each character.

Although the information processing apparatus, the motion control program and the motion control method have been described above by the above-described embodiment, the information processing apparatus, the motion control program and the motion control method according to the present invention are not limited to the above-described embodiment. Various modifications and improvements are possible within the scope of the invention. The matters described in the above-mentioned plurality of embodiments can be combined within a consistent range.

9 Reception unit 10 Information processing device 11 Game execution unit 12 Operation control unit 13 Calculation unit 14 Judgment unit 15 Image processing unit 16 Sound processing unit 17 Display unit 18 Sound output unit 19 Communication unit 31 Storage unit 34 Operation control program 35 Game processing program Ar Supporting polygon G Center of gravity position GL Position of center of gravity on the ground

Claims (6)

A calculation unit that calculates the area where the character touches the ground and the position of the center of gravity of the character based on the movement of the character.
A determination unit that determines whether or not to step on the character's foot based on the calculated area where the character touches the ground and the position of the center of gravity of the character.
It has a motion control unit that predicts the motion of the character after a predetermined time from the current motion of the character.
The calculation unit calculates a region where the character touches the ground based on the predicted movement of the character after the predetermined time.
The calculation unit calculates a polygon connecting the outermost points of the ground contact position of the character's body as a region where the character touches the ground.
The determination unit determines that it is the timing to step on the character's foot when the position of the center of gravity on the ground corresponding to the predicted position of the center of gravity of the character after the predetermined time deviates from the polygonal region. , The character's foot is changed based on the action immediately before the character,
When the position of the center of gravity on the ground corresponding to the position of the center of gravity of the character does not deviate from the polygonal region, it is determined that it is not the timing to step on the foot of the character, and the foot of the character is not stepped. Processing equipment. When the position of the center of gravity on the ground is farther than a predetermined threshold value from the polygonal region, the determination unit determines that the character is toppled instead of stepping on the foot of the character.
The information processing apparatus according to claim 1 . When the character is bipedal, the determination unit determines whether or not to step on the foot that becomes the free leg with respect to the support leg of the character.
The information processing apparatus according to claim 1 or 2 . When the character is walking on four legs, the determination unit determines whether or not at least one of the forefoot and the hindfoot, which are swing legs, is stepped on the supporting leg of the character.
The information processing apparatus according to any one of claims 1 to 3 . Based on the movement of the character, the area where the character touches the ground and the position of the center of gravity of the character are calculated.
Based on the calculated area where the character touches the ground and the position of the center of gravity of the character, it is determined whether or not to step on the character's foot .
From the current movement of the character, the movement of the character after a predetermined time is predicted, and the movement of the character is predicted.
Based on the predicted movement of the character after the predetermined time, the area where the character touches the ground is calculated.
A polygon connecting the outermost points of the grounding position of the character's body is calculated as an area where the character touches the ground.
It is determined that the position of the center of gravity on the ground corresponding to the predicted position of the center of gravity of the character after the predetermined time is the timing to step on the character's foot when it deviates from the area of the polygon, and immediately before the character. The character's foot is changed based on the movement of
When the position of the center of gravity on the ground corresponding to the position of the center of gravity of the character does not deviate from the polygonal region, it is determined that it is not the timing to step on the foot of the character, and the foot of the character is not stepped on.
An operation control program that causes a computer to execute processing. Based on the movement of the character, the area where the character touches the ground and the position of the center of gravity of the character are calculated.
Based on the calculated area where the character touches the ground and the position of the center of gravity of the character, it is determined whether or not to step on the character's foot .
From the current movement of the character, the movement of the character after a predetermined time is predicted, and the movement of the character is predicted.
Based on the predicted movement of the character after the predetermined time, the area where the character touches the ground is calculated.
A polygon connecting the outermost points of the grounding position of the character's body is calculated as an area where the character touches the ground.
It is determined that the position of the center of gravity on the ground corresponding to the predicted position of the center of gravity of the character after the predetermined time is the timing to step on the character's foot when it deviates from the area of the polygon, and immediately before the character. The character's foot is changed based on the movement of
When the position of the center of gravity on the ground corresponding to the position of the center of gravity of the character does not deviate from the polygonal region, it is determined that it is not the timing to step on the foot of the character, and the foot of the character is not stepped on.
An operation control method in which a computer performs a step.

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