WO2005038723A1

WO2005038723A1 - Image display device, image display method, image display program, and computer-readable recording medium containing the image display program

Info

Publication number: WO2005038723A1
Application number: PCT/JP2004/012917
Authority: WO
Inventors: Takayoshi Ishii
Original assignee: Digital Fashion Ltd.
Priority date: 2003-10-17
Filing date: 2004-08-31
Publication date: 2005-04-28
Also published as: JP2005122558A

Abstract

There are provided an image display device, an image display method, an image display program, and a computer-readable recording medium containing the image display program. The image display device displaying a 3-dimensional model includes: a fixed point decision section (104) for deciding a fixing mass point among mass points of polygons as a fixed point; a mass point extraction section (106) for extracting one mass point from the mass points; a gravitation calculation section (107) for calculating the affect of gravitation to the mass point extracted by the mass point extraction section (106) according to the fixed point decided by the fixed point decision section (104); a correction section (108) for successively correcting the shift of the mass points by the affect of the gravitation calculated by the gravitation calculation section (107) by way of constraint processing; and a display control section (110) for controlling a display section (300) to display a virtual try-on state obtained by combining a clothing model formed by connecting the mass points corrected by the correction section (108) and a human body model.

Description

Description Image display device, image display method, image display program, and computer-readable recording medium on which image display program is recorded

The present invention relates to an image display device that displays a three-dimensional model, an image display method, an image display program, and a computer-readable recording medium that stores the image display program. Background art

2. Description of the Related Art Conventionally, there has been known an image display device that virtually simulates a state where a person wears clothes in a three-dimensional space. In such a conventional image display device, simulation based on dynamics is performed in order to represent clothes that are more realistic. The simulation based on the dynamics is, for example, the display of clothes in consideration of the action of gravity, the collision between the human body and the clothes, and the like. This prior art is disclosed, for example, in Japanese Patent Application Laid-Open No. 9-34952 or Japanese Patent Application Laid-Open No. 2002-174174. Here, the processing in the conventional clothing simulation will be described. First, each mass point of the 3D model of the clothing is dropped freely and then moved (extended) under the influence of gravity. By performing the correction process by the point-by-point constraint process, it becomes possible to express natural clothes that conform to the shape of the human body.

Also, in such clothing simulations, how to perform numerical integration of hard differential equations affects the calculation time. In the simulation of clothes, various calculation methods such as implicit method, explicit method and constraint satisfaction method are used. '

However, in the conventional simulation of clothes, the process of once free-falling all the masses of the 3D model that composes the clothing and then correcting each mass moved by the influence of gravity is performed one by one. Therefore, the processing time was long and it was difficult to display in real time. In addition, the implicit method has a problem in that the calculation is stable and accurate, but the calculation takes time. On the other hand, the explicit method is used to simulate clothing displayed in real time. However, the calculation is fast, but it has the problem that the calculation stability and calculation accuracy are poor. In addition, the constraint satisfaction method has the stability of the implicit method in addition to the explicit method described above.However, since it requires convergence calculation, it has the problem that it takes a long time to guarantee high calculation accuracy. I have. Disclosure of the invention

The present invention has been made in order to solve the above-described problems, and an image display device, an image display method, an image display program, and a computer readable by an image recording program which can reduce a processing time are recorded. It is intended to provide a recording medium.

An image display device according to the present invention is an image display device that displays a three-dimensional model, wherein each vertex of a plurality of polygons constituting the three-dimensional model is a material point, and a material point to be fixed from among the material points is a fixed point. Fixed point determining means for determining as a mass point, a mass point extracting means for extracting one mass point from the mass points, and the influence of gravity acting on the mass point extracted by the mass point extracting means are determined by the fixed point determining means. Gravity calculating means for calculating based on the fixed points, correction means for sequentially correcting movement of a mass point due to the influence of gravity calculated by the gravity calculating means by constraint processing, and each of the correction means corrected by the correcting means. Display means for displaying a three-dimensional model formed by connecting the mass points.

According to this configuration, each vertex of a plurality of polygons constituting the three-dimensional model is set as a mass point, a mass point to be fixed is determined from the mass points as a fixed point, and one mass point is extracted from the mass points. The effect of gravity acting on the corrected mass is calculated based on the fixed point, the movement of the mass due to the calculated gravity is corrected successively by the constraint processing, and the corrected masses are formed by connecting each mass 3 The dimensional model is displayed. Therefore, the process of calculating the effect of gravity for each mass point of the 3D model and correcting it by constraint processing is performed sequentially. Compared to the conventional process of correcting each mass moved by the influence one by one, The amount of movement due to the effect of gravity can be reduced, and the processing time for correcting each mass can be shortened.

Further, in the above image display device, it is preferable that the fixed point determining means determines a material point sequentially corrected by the correcting means as a fixed point.

According to this configuration, the sequentially corrected mass points are determined as fixed points, so that all the mass points of the three-dimensional model can be sequentially corrected by the constraint processing based on the fixed points.

Further, in the above image display device, for all the material points of the plurality of polygons constituting the three-dimensional model, distance calculating means for calculating a distance between one material point and another material point; and A storage unit that stores the calculated distance between one mass point and another mass point in association with each other as a correspondence table, and refers to the correspondence table stored in the storage unit to determine the gravity by the gravity calculation unit. And a processing order determining means for determining a processing order for calculating the influence of the plurality of polygons constituting the three-dimensional model in accordance with the processing order determined by the processing order determining means. It is preferable to extract one mass point from.

According to this configuration, the distance between one mass point and another mass point is calculated for all the mass points of a plurality of polygons forming the three-dimensional model, and the calculated distance between one mass point and another mass point is calculated. Are associated with each other and stored as a correspondence table. With reference to the stored correspondence table, a processing order for calculating the effect of gravity is determined, and a plurality of three-dimensional models constituting the three-dimensional model are determined according to the determined processing order. One mass point is extracted from the mass points of the polygon. Therefore, by creating a correspondence table in which the distance between one mass point and another mass point is associated with each other, the influence of gravity acting on each mass point of a plurality of polygons constituting the 3D model is calculated. The processing order can be easily determined.

Further, in the above image display device, the three-dimensional model includes a human body model representing a human body and a clothing model representing clothes worn by the human body, and the fixed point determining unit includes a plurality of parts constituting the clothing model. Each vertex of the polygon is set as a mass point, and a mass point to be fixed from the mass points is determined as a fixed point.The mass point extraction unit extracts one mass point from the mass points, and the gravity calculation unit includes The influence of gravity acting on the mass point extracted by the mass point extraction means is added to the fixed point determined by the fixed point determination means. The correction means sequentially corrects the movement of the mass point due to the influence of gravity calculated by the gravity calculation means by constraint processing, and the display means connects each mass point corrected by the correction means. It is preferable that the clothing model formed by the above and the human body model are combined and displayed.

According to this configuration, each vertex of a plurality of polygons constituting a clothing model representing clothes worn by the human body is set as a mass point, and a mass point to be fixed from the mass points is determined as a fixed point, and one of the mass points is determined as a fixed point. Mass points are extracted, the influence of gravity acting on the extracted mass points is calculated based on the fixed points, the movement of the mass points due to the calculated gravity is sequentially corrected by the constraint processing, and the corrected mass points are connected. The clothing model and the human body model representing the human body are synthesized and displayed. Therefore, the process of calculating the effect of gravity for each mass point of the clothing model and correcting it by the constraint process is performed sequentially, so that each mass point of the clothing model is once dropped freely and then moved by the influence of gravity. Compared with the conventional process of correcting each mass point by point, the amount of movement due to the influence of gravity can be reduced, and the processing time for correcting each mass point can be shortened, providing a realistic feeling. The fitting state can be displayed in real time.

Further, in the image display device described above, it is preferable that the image display device further includes a collision processing unit that performs a collision process with the human body model for each mass point of the plurality of polygons constituting the clothing model.

According to this configuration, the collision process with the human body model is performed for each mass point of a plurality of polygons constituting the clothing model, so that the problem that the clothing model enters the human body model is eliminated, and a more realistic fitting state. Can be displayed in real time. Further, in the above image display device, the collision processing means sets at least a collision determination model large enough to cover the human body model, and generates a repulsive force acting on the mass point as the mass approaches the collision determination model. It is preferable to perform the collision processing with a larger size.

According to this configuration, a collision determination model at least large enough to cover the human body model is set, and the collision processing is performed by increasing the repulsive force acting on the mass point as the mass approaches the collision determination model. Can be easily performed.

Further, in the above image display device, the collision processing means includes the mass point and the person When collision is detected with a plurality of polygon surfaces constituting the body model, and when it is detected that the mass point collides with the polygon surface constituting the human body model, collision processing between the mass point and the polygon surface constituting the human body model is performed. Is preferably performed.

According to this configuration, a collision between the mass point and a plurality of polygon surfaces forming the human body model is detected, and when it is detected that the mass point collides with the polygon surface forming the human body model, the mass point and the human body model are formed. A collision process with the polygon surface to be performed is performed. Therefore, a collision between a mass point and a plurality of polygon surfaces forming the human body model is detected, and when it is detected that the mass point collides with a polygon surface forming the human body model, the polygon forming the mass point and the human body model is detected. Since the collision process with the surface is performed, the collision process can be performed more reliably, and the problem that the clothes model enters the human body model can be more reliably eliminated.

An image display method according to the present invention is an image display method for displaying a three-dimensional model, wherein a computer sets each vertex of a plurality of polygons constituting the three-dimensional model as a mass point and fixes the mass point from the mass points. A fixed point determining step of determining a mass point; a combi-shot is a mass extraction step of extracting one mass point from the mass points; and a computer is a gravity point acting on the mass point extracted in the mass point extraction step. A gravity calculation step of calculating the influence based on the fixed point determined in the fixed point determination step; and a computer in which the computer sequentially corrects the movement of the mass point due to the gravity calculated in the gravity calculation step by a constraint process. A three-dimensional model formed by connecting each mass point corrected in the correction step. Displaying a file.

An image display program according to the present invention is an image display program for displaying a three-dimensional model, wherein each vertex of a plurality of polygons constituting the three-dimensional model is set as a mass point and a fixed mass point is determined from the mass points. Fixed point determining means, a mass point extracting means for extracting one mass point from the mass points, and an influence of gravity acting on the mass point extracted by the mass point extracting means. Gravity calculating means for calculating based on the points; correcting means for sequentially correcting movement of mass points due to the influence of gravity calculated by the gravity calculating means by constraint processing; and each mass point corrected by the correcting means. The computer functions as display means for displaying the three-dimensional model formed by the connection.

According to this configuration, each vertex of a plurality of polygons constituting the three-dimensional model is set as a mass point, a mass point to be fixed is determined from the mass points as a fixed point, and one mass point is extracted from the mass points. The effect of gravity acting on the corrected mass is calculated based on the fixed point, the movement of the mass due to the calculated gravity is corrected successively by the constraint processing, and the corrected masses are formed by connecting each mass 3 The dimensional model is displayed. Therefore, the process of calculating the effect of gravity for each mass point of the 3D model and correcting it by constraint processing is performed sequentially. Compared to the conventional process that corrects each point moved by the influence one point at a time, the amount of movement by the influence of gravity can be reduced, and the processing time for correcting each point can be shortened .

A computer-readable recording medium that stores the image display program according to the present invention is a computer-readable storage medium that stores an image display program that displays a three-dimensional model. Each vertex of the polygon is a material point, and fixed point determining means for determining a material point to be fixed from the material points; material point extracting means for extracting one material point from the material points; and the material point extracting means. Gravity calculation means for calculating the influence of gravity acting on the extracted mass point based on the fixed point determined by the fixed point determination means, and movement of the mass point due to the gravity effect calculated by the gravity calculation means. Correction means for sequentially correcting by constraint processing; The computer functions as display means for displaying a three-dimensional model formed by connecting the mass points corrected by the correction means.

The objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings. Brief Description of Drawings

FIG. 1 is a diagram showing a hardware configuration of an image display device according to an embodiment of the present invention.

FIG. 2 is a block diagram for explaining functions of the image display device according to the present invention. FIG. 3 is a flowchart for explaining image display processing by the image display device shown in FIG.

FIG. 4 is a diagram for explaining a geometric distance between each mass point of a plurality of polygons constituting a clothing model.

FIG. 5 is a diagram for explaining the determination of the processing order.

FIG. 6 is a diagram for explaining gravity calculation processing for calculating the influence of gravity acting on each mass point.

FIG. 7 is a diagram for explaining a process of sequentially correcting mass points of a plurality of polygons constituting a clothing model.

FIG. 8 is a diagram for explaining the collision processing. FIG. 9 is a diagram for explaining a repulsive force acting on a mass point of the clothing model.

FIG. 10 is a diagram for explaining a collision ball in the present embodiment.

FIG. 11 is a diagram illustrating an example of a display screen displayed on the display unit.

FIG. 12 is a diagram comparing processing by the conventional image display device with processing by the image display device according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a hardware configuration of an image display device according to an embodiment of the present invention.

The image display device shown in Fig. 1 is composed of a normal computer, and has an input device 1, a ROM (read only memory) 2, a CPU (central processing unit) 3, a RAM (random access memory) 4, and an external storage device 5. , Display device 6 and recording medium drive device 7. Each block is connected to an internal bus, and various data and the like are input / output via this bus, and various processes are executed under the control of the CPU 3. The input device 1 includes a keyboard, a mouse, and the like, and is used by an operator to input various data, operation commands, and the like.

The ROM 2 stores system programs such as B IOS (Basic Input / Output System). The external storage device 5 is configured by a hard disk drive or the like, and stores a predetermined ΔS (Operating System), an image display program described later, and the like. The RAM 4 is used as a work area of the CPU 3 and the like.

The display device 6 includes a liquid crystal display device, a cathode ray tube (CRT), and the like, and displays a virtual fitting state created by executing an image display program under the control of the CPU 3.

The recording medium drive 7 includes a DVD-ROM drive, a CD-ROM drive, a flexible disk drive, and the like. The image display program is recorded on a computer-readable recording medium 8 such as a DVD-ROM, a CD-ROM, or a flexible disk, and the recording medium driving device 7 reads out the image processing program from the recording medium 8 and externally stores the image processing program. Install and run on device 5 May be. When the image display device includes a communication device or the like and the image display program is stored in another computer connected via a communication network, the image display program is downloaded from the computer via the network. May be executed.

FIG. 2 is a block diagram for explaining functions of the image display device according to the present invention. As shown in FIG. 2, the image display device includes a program execution unit 100, a storage unit 200, and a display unit 300. The program execution unit 100 is realized by the CPU 3 executing an image display program, and includes a three-dimensional data acquisition unit 101, a distance calculation unit 102, a correspondence table creation unit 103, and fixed point determination. Unit 104, processing order determination unit 105, mass point extraction unit 106, gravity calculation unit 107, correction unit 108, collision processing unit 109, and display control unit 110 Is done. The storage unit 200 includes a RAM 4 and the like, is realized by the CPU 3 executing an image display program, and includes a three-dimensional data storage unit 201 and a correspondence table storage unit 202. You.

The three-dimensional data storage unit 201 stores, in a virtual three-dimensional space, three-dimensional data of a human body model composed of a plurality of polygons and three-dimensional data of a clothing model composed of a plurality of polygons. ing. The three-dimensional data storage unit 201 stores, as three-dimensional data, the coordinates of each vertex of the polygons that make up the human body model in the three-dimensional space, and forms a clothing model that represents the clothes worn by the human body. The coordinates of each vertex in the 3D space of the polygon are stored as 3D data.

The three-dimensional data acquisition unit 101 acquires the three-dimensional data of the human body model and the three-dimensional data of the clothing model stored in the three-dimensional data storage unit 201. Note that the vertices of a plurality of polygons constituting the clothing model are taken as mass points.

The distance calculation unit 102 calculates the geometric distance between one mass point and another mass point for all the mass points of a plurality of polygons constituting the clothing model acquired by the three-dimensional data acquisition unit 101. Is calculated. The geometric distance represents the number of ridge lines connecting one mass point and another mass point in a plurality of polygons constituting the clothing model. That is, the distance calculation unit 102 connects the one mass point and the other mass points with the shortest distance to all the mass points of the polygons constituting the clothing model acquired by the three-dimensional data acquisition unit 101. Calculate the number of edges.

The correspondence table creation unit 103 creates a correspondence table in which the geometric distances between one mass point calculated by the distance calculation unit 102 and another mass point are associated with each other. The correspondence table creation unit 103 is a two-dimensional table format that includes the number of ridges connecting the one mass point calculated by the distance calculation unit 102 and the other mass point in the shortest time, which is composed of rows and columns. Create as a table. The correspondence table storage unit 202 stores a correspondence table created by the correspondence table creation unit 103 and correlating the geometric distance between one mass point and another mass point.

The fixed point determining unit 104 determines a fixed point from among the mass points of a plurality of polygons constituting the clothes model. The fixed point is a point that is not affected by gravity, and the fixed point determining unit 104 selects a material point at which the human body model and the clothing model come into contact from among a plurality of polygons constituting the clothing model. Is detected, and the detected mass point is determined as a fixed point.

The processing order determination unit 105 refers to the correspondence table stored in the correspondence table storage unit 202 to determine the processing order of the mass points for which the gravity calculation unit 107 calculates the influence of gravity. Specifically, the processing order determining unit 105 refers to the correspondence table stored in the correspondence table storage unit 202, and determines the fixed point determined by the fixed point determining unit 104 and the fixed point other than the fixed point. The value that minimizes the geometric distance associated with each mass point is determined, and the processing order is determined in ascending order of the determined values.

The material point extracting unit 106 extracts material points of a plurality of polygons constituting the clothing model according to the processing order determined by the processing order determining unit 105.

The gravity calculation unit 107 determines the influence of gravity acting on each mass point of a plurality of polygons constituting the clothing model extracted by the mass point extraction unit 106 by the fixed point determination unit 104. Calculate sequentially based on fixed points. In addition, the gravity calculation unit 107 is configured to correct the gravity acting on the mass point linked to the fixed point determined by the fixed point determination unit 104, and the gravity calculation unit 107 is configured to calculate the gravity calculated by the gravity calculation unit 107. The movement of the mass point due to the influence of is gradually corrected by the constraint processing according to the shape of the human body model. That is, the correction unit 108 corrects the mass point moved by the action of gravity to a position corresponding to the shape of the human body model by the constraint processing. The collision processing unit 109 calculates the influence exerted on the clothes model by colliding the mass points of the polygons constituting the clothes model with the human body model, and based on the calculated influence, calculates the influence of the clothes model. Move the mass. Further, the collision processing unit 109 sets a collision judgment model at least large enough to cover the human body model, and increases the repulsive force acting on the mass point as the mass point of the clothing model approaches the collision judgment model. Perform collision processing. Further, when the distance between the mass point of the clothes model and the collision determination model becomes equal to or less than a predetermined distance, the collision processing unit 109 detects a collision between the mass point and the collision determination model, and the collision of the mass point occurs. If collision is detected with the judgment model, collision processing is performed.

The display control unit 110 combines the clothing model formed by connecting the mass points sequentially corrected by the correction unit 108 with the human body model obtained by the three-dimensional data obtaining unit 101. The display is controlled so as to be displayed on the display section 300.

The display unit 300 is constituted by a display device 6 and the like, is realized by the CPU 3 executing an image display program, and is formed by connecting the mass points sequentially corrected by the correction unit 108. And a virtual fitting state in which the human body model obtained by the three-dimensional data obtaining unit 101 is synthesized. FIG. 3 is a flowchart for explaining image display processing by the image display device shown in FIG.

In step S1, the three-dimensional data acquisition unit 101 acquires the three-dimensional image (human body model) of the human body stored in the three-dimensional data storage unit 201, and acquires the three-dimensional data storage unit 201. Get the 3D image (clothes model) of the clothes stored in.

In step S2, the distance calculation unit 102 compares one mass point and another mass point with respect to all the mass points of a plurality of polygons constituting the clothes model acquired by the three-dimensional data acquisition unit 101. Calculate the number of ridge lines connecting the shortest.

In step S3, the correspondence table creation unit 103 creates a correspondence table in which the geometric distances between one mass point calculated by the distance calculation unit 102 and another mass point are associated with each other, The created correspondence table is stored in the correspondence table storage unit 202.

Figure 4 shows the geometrical shape between the mass points of the polygons that make up the clothes model. FIG. 4 (a) is a diagram illustrating an example of a plurality of polygons constituting a clothing model, and FIG. 4 (b) is a diagram illustrating a clothing model shown in FIG. 4 (a). FIG. 6 is a diagram showing a correspondence table of geometric distances of each mass point in the embodiment.

As shown in FIG. 4 (a), a plurality of polygons constituting the clothing model have mass points a to j. Here, looking at mass a, the geometric distance from mass a to mass b, c, d, e, f, g is the mass of mass a and mass b, c, d, e, f, g Since the number of ridge lines connecting the shortest to is one, each is 1. Also, the geometric distance from the point a to the points h, i, j is 2 because the number of ridge lines connecting the points a, h, i, j with the shortest is two. Looking at point b, the geometric distance from point b to points a, c, and d is 1, and the geometric distance from point b to points e, f, g, and h. Are 2 respectively, and the geometric distance from mass point b to mass points i and j is 3 respectively.

As described above, the distance calculation unit 102 determines the shortest distance between one mass point and another mass point for all the mass points of the polygons forming the clothes model acquired by the three-dimensional data acquisition unit 101. The correspondence table creation unit 103 comprises the number of ridge lines connecting the one mass point and the other mass point calculated by the distance calculation unit 102 as short as possible from rows and columns. Create as a two-dimensional table format correspondence table. That is, as shown in FIG. 4 (b), the correspondence table creation unit 103 calculates the number of ridge lines connecting the mass point a calculated by the distance calculation unit 102 and the other mass points b to j in the shortest. It is created as a two-dimensional table-type correspondence table composed of and a column, and the created correspondence table is stored in the correspondence table storage unit 202. Returning to FIG. 3, in step S4, the fixed point determining unit 104 detects a mass point at which the human body model and the clothing model are in contact from among the mass points of a plurality of polygons constituting the clothing model, and detects the detected mass point. Is determined as a fixed point that does not reflect the effect of gravity. For example, if the clothing is a dress or a shirt, the mass from the neck to the shoulder is determined as the fixed point.

In the present embodiment, the fixed point determining unit 104 determines, as a fixed point, a material point at which the human body model and the clothing model are in contact from among the plurality of polygons constituting the clothing model. However, the present invention is not particularly limited thereto. For example, a clothing model is displayed on the display device 6, and the user operates the input device 1 with respect to the displayed clothing model. The fixed point may be set by using this.

In step S5, the processing order determination unit 105 refers to the correspondence table stored in the correspondence table storage unit 202, and refers to the fixed point determined by the fixed point determination unit 104 and the fixed point. The value that minimizes the geometric distance associated with each point other than the point is determined, and the processing order is determined in ascending order of the determined value.

FIG. 5 is a diagram for explaining the determination of the processing order. FIG. 5 (a) is a diagram showing an example of a plurality of polygons constituting a clothing model, and FIG. FIG. 5 is a diagram showing a correspondence table between the fixed points b and c when the mass points b and c shown in (a) are fixed points and the mass points a and d to j other than the fixed points b and c. (c) is a diagram showing the minimum values of rows b and c in FIG. 5 (b) in association with mass points a to j.

Assuming that the fixed points b and c shown in Fig. 5 (a) are fixed points, the geometric distance from fixed point b to the points a and c to j other than fixed point b, and fixed point c to fixed point c The geometric distances to the other mass points a, b, and d to j are associated as shown in Fig. 5 (b). Then, the value that minimizes the geometric distance associated with the fixed points b and j and the mass points a and d to other than the fixed points b and c) is as shown in Fig. 5 (c). Corresponding as shown in That is, as shown in Fig. 5 (c), the geometric distance between the fixed point b and the mass point a is 1, and the geometric distance between the fixed point c and the mass point a is 1. The minimum value of the mass point a corresponding to the points b and c is 1, the geometric distance between the fixed point b and the mass point d is 1, and the geometric distance between the fixed point c and the mass point d is 2. Therefore, the minimum value of the mass point d corresponding to the fixed points b and c is 1. Similarly, the minimum value of the mass point e corresponding to the fixed points b and c is 1, the minimum value of the mass point f corresponding to the fixed points b and c is 2, and the minimum value of the mass point g corresponding to the fixed points b and c. The value is 2, the minimum value of the mass point h corresponding to the fixed points b and c is 2, the minimum value of the mass point i corresponding to the fixed points b and c is 3, and the mass j corresponding to the fixed points b and c The minimum value of is 3.

In this way, the processing order determination unit 105 refers to the correspondence table stored in the correspondence table storage unit 202, and refers to the correspondence table stored in the correspondence table storage unit 202. , The fixed points b and c, except for the mass points a and d ~: The value that minimizes the geometric distance associated with i is determined. In the example shown in FIG. The processing order is determined in the order of a, mass d, mass e, mass f, mass g, mass h, mass i and mass j. Returning to FIG. 3, in step S6, the mass point extraction unit 106 selects a plurality of polygons of the plurality of polygons constituting the clothing model in accordance with the processing order determined by the processing order determination unit 105. , 1 to extract the mass point. That is, in the example of FIG. 5, the mass point extraction unit 106 first extracts the mass point a, and then extracts the mass points in the order of mass point d, mass point e, mass point, mass point g, mass point h, mass point i, and mass point j. Will be done.

In step S7, the gravity calculation unit 107 calculates the influence of gravity on the mass points extracted by the mass point extraction unit 106. Here, the gravity calculation processing by the gravity calculation unit 107 will be described.

FIG. 6 is a diagram for explaining gravity calculation processing for calculating the influence of gravity acting on each mass point. In FIG. 6, the mass points of a plurality of polygons constituting the clothing model are set to a1, a2, a3, b1> b2, b3, cl, c2, and c3. Here, a case where the mass points a l, a 2, and a 3 are fixed points and gravity calculation processing is performed on the mass point b 2 will be described.

The gravity calculation unit 107 calculates the influence of gravity acting on the mass point b 2 linked to the fixed points a 1, a 2, a 3 determined by the fixed point determination unit 104, as fixed points al, a 2, Calculate based on a3. That is, when performing gravity calculation on the mass point b 2, the gravity calculation unit 107 only determines the relationship between the fixed points a 1, a 2, a 3 linked to the mass point b 2 and the position of the mass point b 2 Is calculated.

Returning to FIG. 3, in step S8, the correction unit 108 performs convergence processing on the mass point calculated by the gravity calculation unit 107 to thereby move the mass point (so-called elongation). In addition to the sequential correction, the collision processing unit 109 performs a collision process with the human body model on each mass point of a plurality of polygons constituting the clothing model.

That is, as shown in FIG. 6, the correction unit 108 sequentially corrects the movement of the mass point by performing convergence processing on the mass point b2 calculated by the gravity calculation unit 107, and Move the mass to a position along the shape. Further, the corrected mass point b2 is used as a fixed point in the gravity calculation process for the mass points c1, c2 and c3 linked to the mass point b2.

FIG. 7 is a diagram for explaining a process of sequentially correcting the mass points of a plurality of polygons constituting the clothes model, and FIG. 7 (a) is a diagram illustrating a plurality of polygons constituting the clothes model. Fig. 7 (b) is a diagram showing the state of mass points of the gon, Fig. 7 (b) is a diagram showing the state of mass points of a plurality of polygons constituting the clothing model after the gravity calculation processing, and Fig. 7 (c) is FIG. 6 is a diagram showing a state of mass points of a plurality of polygons constituting the clothing model of FIG.

The clothing model shown in FIG. 7A has mass points v l to v 5, wl to w5, xl to x5, and y l to y5. In Fig. 7 (a), when the effect of gravity on the mass point w2 of the clothes model composed of multiple polygons is calculated, as shown in Fig. 7 (b), the mass point w2 becomes lower due to the effect of gravity. Go to Then, the correction unit 108 performs a process of sequentially correcting the mass point w2 moved downward by the action of gravity by the constraint process.

Here, the constraint processing will be described. There are two types of constraints in the constraint processing in this embodiment, a distance constraint between mass points and a bending constraint between mass points. Among them, the latter bending constraint between mass points can be reduced to the former distance constraint between mass points. Therefore, in the present embodiment, only the distance constraint between mass points is used as a constraint condition. The distance constraint between mass points can be realized by simply listing the positional relationship between the two mass points. That is, the correction amount dE of the position of the mass point can be expressed by the following equation (1), and the correction amount dV of the vector of the mass point can be expressed by the following equation (2).

dE = (i 1— c 1) / c 1 * 1 ambd a

dV = v * dE

Where dV represents the correction amount (vector) of the mass point, V represents the difference vector between the two mass points, dE represents the correction amount of the mass point, and i1 represents the initial length between the two mass points. , C 1 represents the current length of the two mass points, and 1 amb da represents a fixed value for the correction amount.

Then, since n mass points are connected to one mass point, the amount corrected by one constraint processing is ∑dV.

As shown in FIG. 7 (c), the correction unit 108 obtains the correction amount of the mass point w2 moved downward by the action of gravity by the constraint processing, and corrects the position based on the obtained correction amount. As a result, the mass point w 2 moves upward and moves to a position along the shape of the human body model. In this way, the movement amount due to the gravity acting on the mass point from the fixed point is calculated, and the position of the mass point is moved based on the calculated movement amount, Restriction processing for correcting the position of the mass point is performed for each mass point. Therefore, compared to the conventional process of calculating the movement amount due to gravity collectively for all mass points, moving the positions of all mass points based on the calculated movement amount, and correcting each point one by one, Since the amount of movement of the mass moved by the action of gravity is reduced, the processing time required to correct the mass moved by the action of gravity can be reduced, and the overall processing time can be reduced. it can.

Also, in step S8, the collision processing unit 109 sets a collision ball (corresponding to a collision determination model) that covers at least the periphery of the human body model, and as the mass point of the clothing model approaches the set collision ball, The repulsion, which represents the force to push back the clothes, is increased to perform the collision process between the mass point and the collision ball.

Fig. 8 is a diagram for explaining the collision process. Fig. 8 (a) is a diagram showing the state of the clothing model before the collision, and Fig. 8 (b) is a diagram showing the state of the clothing model after the collision. FIG.

When the colliding sphere S shown in FIG. 8 (b) collides with the clothing model shown in FIG. 8 (a), the collision processing unit 109 performs a collision process, and maps the mass points v5, w5, and x5 respectively. 8 Move as shown in (b). As a result, it is possible to prevent an unnatural state in which the clothes model enters the human body model.

FIG. 9 is a diagram for explaining a repulsive force acting on a mass point of the clothing model. As shown in Fig. 9, assuming that the upper limit of the repulsive force is K, the repulsive force acting on the mass from the position (R + b) away from the center of the collision ball S to the position in contact with the collision ball S is K-T It is represented by ³ . Note that T = (R + b-1) / b, 1 represents the distance between the center of the collision sphere S and the mass point, R represents the radius of the collision sphere S, and b represents the area around the collision sphere S. Represents the attenuation region.

That is, as the mass point of the clothing model approaches the collision ball S set in advance, the collision processing unit 109 increases the repulsive force representing the force that pushes the clothes back from the human body, and the repulsive force on the straight line connecting the collision ball S and the mass point. Then, the mass is moved based on the obtained correction amount.

• FIG. 10 is a diagram for explaining a collision sphere in the present embodiment. FIG. 10 (a) is a diagram showing a human body model, and FIG. 10 (b) is a diagram showing a collision sphere. FIG. 10 (c) is a diagram in which the human body model shown in FIG. 10 (a) and the impact ball shown in FIG. 10 (b) are superimposed.

The collision processing unit 109 reads out the collision sphere SM corresponding to the human body model JM from the storage unit 200, and uses the composite model GM obtained by superimposing the read collision sphere SM and the human body model JM. Perform collision processing. As shown in Fig. 10 (b), the collision sphere SM has a width corresponding to the gap between the clothes and the human body, and extends from the neck of the human body model JM to the left and right fingertips and the left and right ankles. It is set in advance to cover. Therefore, as shown in Fig. 10 (c), when the human body model JM and the collision sphere SM are superimposed, the human body model JM has a width equal to the gap between the clothes and the human body. In particular, the area from the neck to the left and right fingertips and the left and right ankles is covered with the collision sphere SM, and the collision sphere SM and the mass point of the clothing model are subjected to collision processing.

In this way, collision processing with the human body model is performed for each mass point of a plurality of polygons that make up the clothing model, thereby eliminating the problem of the clothing model entering the human body model and realizing a more realistic fitting state in real time. Can be displayed.

In addition, since the mass point subjected to the collision processing is determined as a fixed point, the mass point moved by the collision is determined as the fixed point, and the movement due to the influence of gravity acting on the mass point linked to the fixed point becomes small. The time required for the calculation to undo the effect of gravity on the mass point can be reduced.

Also, a collision sphere SM (collision determination model) large enough to cover at least the human body model JM is set, and as the mass approaches the collision sphere SM, the repulsive force acting on the mass is increased to perform collision processing. However, collision processing can be easily performed. In the present embodiment, the collision processing unit 109 sets a collision ball S covering at least the periphery of the human body model, and pushes the clothes back from the human body as the mass point of the clothing model approaches the set collision ball S. The collision processing between the mass point and the collision sphere S is performed by increasing the repulsive force representing the force. However, the present invention is not particularly limited to this. When a collision is detected with a polygon surface of the human body model and it is detected that the mass point collides with a polygon surface constituting the human body model, a collision process between the mass point and the polygon surface constituting the human body model may be performed. That is, the collision processing unit 109 detects a collision between the mass point and the polygon surface forming the human body model, and If it is detected that a collision occurs with the polygon surface constituting the polygon, collision processing is performed based on the relationship between the incident angle at which the mass point enters the polygon surface and the reflection angle at which the mass point reflects from the polygon surface. In this case, a collision between the mass point and a plurality of polygon surfaces constituting the human body model is detected, and when it is detected that the mass point collides with the polygon surface constituting the human body model, the collision between the mass point and the polygon surface constituting the human body model is performed. Since the collision processing is performed, the collision processing can be performed more reliably, and the problem that the clothes model enters the human body model can be more reliably eliminated.

Further, the two collision processing methods described above may be combined. That is, the collision processing unit 109 sets a collision judgment model at least large enough to cover the human body model, and increases the repulsive force acting on the mass point as the mass approaches the collision judgment model to perform the collision processing. After that, the collision between the mass point and the polygon surfaces that make up the human body model is detected, and if it is detected that the mass point collides with the polygon surface that makes up the human body model, the collision between the mass point and the polygon surface that makes up the human body model is detected. Perform collision processing.

In this case, first, as the mass approaches the collision sphere SM, collision processing is performed by increasing the repulsive force acting on the mass. After the collision processing is performed, the mass and the polygons that make up the human body model JM are further increased. When a collision with a surface is detected and a particle is detected to collide (intersect) with a polygon surface constituting the human body model JM, collision processing between the mass point and the polygon surface constituting the human body model is performed. In this way, by combining the two collision processes, even if the mass enters the human body model in the former collision process, it can be resolved by the latter collision process. The inconvenience of getting into the body model can be more reliably eliminated.

Returning to FIG. 3, in step S9, the correction unit 108 determines whether or not the correction processing has been completed for all the mass points of a plurality of polygons constituting the clothing model. If it is determined that the correction processing has been completed for all the mass points (YE S in step S9), the process proceeds to step SI0, and if it is determined that the correction processing has not been completed for all the mass points ( (NO in step S9), and the process returns to step S4. Then, in step S4, the fixed point determination unit 104 newly determines the material point after the correction processing as a fixed point, and executes the processing in step S5 and subsequent steps.

In step S10, the correction unit 108 applies all the mass points of the clothes model The collision processing unit 109 collectively performs the collision processing on all the mass points of the clothes model. Note that the processing here is performed by performing correction processing and collision processing for all mass points collectively, in case the correction processing and collision processing for each mass point in Step S8 fail to complete the correction. It is more reliable to correct the mass point.

In step S11, the display control unit 110 combines the clothes model subjected to the collision processing by the collision processing unit 109 with the human body model acquired by the three-dimensional data acquisition unit 101. The synthesized three-dimensional data is output to the display unit 300. The display unit 300 displays a state in which the human body model is virtually trying on the clothing model according to the three-dimensional data output from the display control unit 110. Then, returning to step S4, the process from step S4 to step S11 is repeatedly performed at a predetermined frame rate, for example, 30 fps (frame per second), thereby displaying the fitting state in real time. be able to. '

FIG. 11 is a diagram showing an example of a display screen displayed on the display unit 300. As shown in FIG. As shown in FIG. 11, on the display screen HG, a state in which the human body model JM is virtually trying on the clothing model IM is displayed. The influence of gravity acting on the mass point of the clothing model IM is calculated based on the fixed point, and the movement of the mass point due to the calculated gravity effect is successively corrected by the constraint process, so that the clothing model IM is a human body model JM. Will be displayed along the shape of.

FIG. 12 is a diagram comparing the processing by the conventional image display device with the processing by the image display device according to the present invention. FIG. 12 (a) illustrates the processing by the conventional image display device. FIG. 12 (b) is a cross-sectional view for explaining the processing by the image display device according to the present invention.

As shown in Fig. 12 (a), in the processing by the conventional image display device, the mass points A1 to G1 of the clothing model IM are calculated by calculating the influence of gravity, and the points A2 to G2 Go to Then, the points A2 to G2 are moved to the points A3 to G3 by being corrected by the constraint processing. As described above, in the processing by the conventional image display device, each of the masses A 2 -G 2 which have been once dropped freely on all the masses A 1 to G 1 of the clothing model IM and then moved by the influence of gravity. The shape of the human body model JM Corrected to the position along the shape.

On the other hand, as shown in FIG. 12 (b), in the processing by the image display device according to the present invention, first, the mass point A1 is determined as a fixed point, and the mass point A1 is determined as the fixed point. It moves to point B2 by calculating the effect of gravity acting on B1. Point B2 moves to point B3 by being modified by the constraint processing. Then, the point B3 is newly determined as a fixed point, and the influence of gravity acting on the mass point C1 is calculated from the point B3 newly determined as the fixed point. As described above, in the processing by the image display device according to the present invention, the mass point A1 of the clothing model IM is set as a fixed point, the mass point B1 is dropped freely from the mass point A1, and then the mass point B moved under the influence of gravity. 2 is corrected to position B3 along the shape of the human body model JM. Then, the corrected point B 3 is set as a fixed point, and the mass point C 2 is moved free from the mass point B 3 to the mass point C 1, and then moved to the position C along the shape of the human body model JM. Corrected to 3.

Here, comparing the mass point G1 in Fig. 12 (a) with the mass point G1 in Fig. 12 (b), the amount of movement of the mass point G1 due to the calculation of the effect of gravity is shown in Fig. 12 (b). FIG. 12 (a) is larger, and as a result, the processing time for correcting point G2 to point G3 is longer in FIG. 12 (a) than in FIG. 12 (b).

In this way, the vertices of a plurality of polygons constituting the clothing model IM representing the clothes worn by the human body are set as the mass points, and the fixed mass point is determined as the fixed point from among the mass points. Mass points are extracted, and the influence of gravity acting on the extracted mass points is calculated based on the fixed points.The movement of the mass due to the calculated influence of gravity is sequentially corrected by constraint processing, and the corrected mass points are connected. The clothing model IM formed by this and the human body model JM representing the human body are combined and displayed. Therefore, the effect of gravity is calculated based on the fixed point for each mass point of the clothing model IM, and the processing of correcting by the constraint processing is sequentially performed. The amount of movement due to gravity can be reduced compared to conventional processing that corrects each point moved by the influence of gravity point by point, reducing the processing time for correcting each point Display a realistic fitting state in real time can do.

In addition, since the sequentially corrected mass points are determined as fixed points by the fixed point determining unit 104, all the mass points of the clothes model can be sequentially corrected by the constraint processing based on the fixed points.

Furthermore, the geometric distance between one mass point and another mass point is calculated for all the mass points of the polygons constituting the clothing model, and the geometric distance between the calculated one mass point and another mass point is calculated. The distances are associated with each other and stored as a correspondence table. With reference to the stored correspondence table, a processing order for calculating the effect of gravity is determined, and a clothing model is constructed according to the determined processing order. One mass point is extracted from the mass points of multiple polygons. Therefore, by creating a correspondence table in which the geometric distance between one mass point and another mass point is associated with each other, the influence of gravity acting on each mass point of a plurality of polygons constituting the clothing model is calculated. The processing order can be easily determined.

Although the present embodiment has been described using a clothes model representing clothes worn by a human body, the present invention is not particularly limited to this. For example, a soft cloth such as a cloth to which one end of a curtain or a flag is fixed is used. It can also be applied to 3D models representing materials.

Although the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that innumerable modifications not illustrated are conceivable without departing from the scope of the present invention. Industrial applicability

The image display device, the image display method, the image display program, and the recording medium on which the image display program according to the present invention is recorded can be read all over the mass point of the three-dimensional model. The amount of movement due to gravity can be reduced, and the processing time for correcting each mass can be reduced, as compared to the conventional processing in which each mass moved by the influence of gravity is corrected point by point. It is useful as an image display device that displays a three-dimensional model, an image display method, an image display program, and a computer-readable recording medium that stores the image display program.

Claims

The scope of the claims

1. An image display device for displaying a three-dimensional model,

Fixed point determining means for determining each vertex of a plurality of polygons constituting the 3D model as a mass point, and determining a mass point to be fixed from among the mass points as a fixed point;

Mass extraction means for extracting one mass from the mass,

Gravity calculation means for calculating the influence of gravity acting on the mass point extracted by the mass point extraction means based on the fixed point determined by the fixed point determination means, and by the influence of gravity calculated by the gravity calculation means Correction means for sequentially correcting the movement of the mass by constraint processing;

A display unit for displaying a three-dimensional model formed by connecting the respective mass points corrected by the correction unit.

2. The image display device according to claim 1, wherein the fixed point determining unit determines the mass points sequentially corrected by the correcting unit as fixed points.

3. distance calculating means for calculating a distance between one mass point and another mass point with respect to all mass points of the plurality of polygons constituting the three-dimensional model;

Storage means for storing the correspondence between the one mass point calculated by the distance calculation means and the other mass point as a correspondence table,

A processing order determining unit that determines a processing order of calculating the influence of gravity by the gravity calculating unit with reference to a correspondence table stored in the storing unit; 2. The image display device according to claim 1, wherein one mass point is extracted from mass points of a plurality of polygons forming the three-dimensional model in accordance with the processing order determined by the determination unit.

4. The three-dimensional model includes a human body model representing a human body and a clothing model representing clothes worn by the human body,

The fixed point determining means determines each vertex of a plurality of polygons constituting the clothes model as a material point, and determines a material point to be fixed from among the material points as a fixed point,

The mass point extracting means extracts one mass point from the mass points,

The gravity calculation means includes a weight acting on the mass point extracted by the mass point extraction means. Calculating the influence of the force based on the fixed point determined by the fixed point determination means, the correction means sequentially corrects the movement of the mass point due to the influence of gravity calculated by the gravity calculation means by constraint processing,

The said display means combines and displays the clothing model formed by connecting each mass point corrected by the correction means with the human body model.

5. The method according to claim 4, further comprising: a collision processing unit configured to perform a collision process with the human body model on each mass point of the plurality of polygons constituting the clothing model.

6. The collision processing means sets a collision judgment model at least large enough to cover the human body model, and performs a collision process by increasing a repulsive force acting on the mass point as the mass approaches the collision judgment model. The image according to claim 5, characterized in that:

7. The collision processing means detects collision between the mass point and a plurality of polygon surfaces constituting the human body model, and when it is detected that the mass point collides with a polygon surface constituting the human body model, 6. The image display device according to claim 5, wherein a collision process is performed between the polygon surface and the human body model.

8. An image display method for displaying a three-dimensional model,

A computer determining each vertex of the plurality of polygons constituting the three-dimensional model as a mass point, and determining a fixed mass point from the mass points;

A computer extracting a mass point from the mass points; andthe computer determines the influence of the weight acting on the mass point extracted in the mass point extraction step by the fixed point determined in the fixed point determination step. A gravity calculation step that calculates based on points,

A correction step in which the computer sequentially corrects the movement of the mass point due to the influence of gravity calculated in the gravity calculation step by a constraint process;

A computer displaying a three-dimensional model formed by connecting the mass points corrected in the correction step.

9. An image display program for displaying a three-dimensional model, wherein each vertex of a plurality of polygons constituting the three-dimensional model is set as a material point, and fixed point determining means for determining a material point to be fixed from the material points,

Mass extraction means for extracting one mass from the mass,

An image display program for causing a computer to function as display means for displaying a three-dimensional model formed by connecting the respective mass points corrected by the correction means.

10. A computer-readable recording medium recording an image display program for displaying a three-dimensional model,

Fixed point determining means for determining each vertex of the plurality of polygons constituting the three-dimensional model as a mass point and determining a mass point to be fixed from among the mass points;

Mass extraction means for extracting one mass from the mass,

A computer-readable recording medium that stores an image display program for causing a computer to function as a display unit that displays a three-dimensional model formed by connecting the mass points corrected by the correction unit.