KR20200056764A - Method for automatically set up joints to create facial animation of 3d face model and computer program - Google Patents

Abstract

Disclosed is a method for automatically setting up joints in a 3D target model by using a computer. The method comprises the steps of: receiving a 3D standard model in which first joints having a hierarchical structure are set up; receiving a 3D target model having the same geometry as a geometry of the 3D standard model; obtaining a target skeleton by copying the first joints having the hierarchical structure from the 3D standard model in which the first joints having the hierarchical structure are set up; calculating MBBs of the 3D standard model and the 3D target model; and modifying the target skeleton according to the position and size of the 3D target model by using the calculated MBBs, and placing the modified target skeleton in the 3D target model.

Description

METHOD FOR AUTOMATICALLY SET UP JOINTS TO CREATE FACIAL ANIMATION OF 3D FACE MODEL AND COMPUTER PROGRAM}

An embodiment according to the concept of the present invention relates to a joint automatic setup method, and more particularly, to a method for automatically setting up joints for generating a face animation of a 3D face model and a computer program.

In general, a method (or method) of creating a 3D face animation can be divided into a brand shape method (or method) and a joint-based method (or method).

The brand shape method is a method of creating facial expressions and facial animations by making dozens to hundreds of basic expressions and combining the basic expressions by a method such as linear interpolation. The brand shape method is often used to produce content that requires high-quality video even if it takes a long time to produce, such as a movie or animation.

1A-1C show 3D face models, joints and skeletons, and a joint-set 3D face model as pictures for explaining a conventional joint-based scheme. 1A shows a 3D face model, FIG. 2B shows joints, and FIG. 1C shows a 3D face model with joints set up.

The joint-based method creates joints for generating facial expressions as shown in FIG. 1C inside a 3D face model, connects the joints with a mesh of the 3D face model, and then moves the joints to create an overall This is how to make a facial expression. The joint-based method is used in areas where real-time processing such as a game is important rather than in areas where high-quality images are important because the control of facial expressions is intuitive and the amount of data required to create a face animation is small.

Therefore, the joint-based method is mainly used for content production using a game engine or the like. The joint-based method goes through a total of two steps, the step of placing the joints inside the face internal model and the skinning step of connecting the positioned joints and the mesh, and the operator manually works whenever the 3D face model changes. The joints should be placed inside the 3D face model.

Patent Document 1: Republic of Korea Registered Patent Publication-10-1686028 (announced on December 13, 2016) Patent Document 2: Republic of Korea Registered Patent Publication-10-1102778 (announced on January 5, 2012) Patent Literature 3: Republic of Korea Registered Patent Publication-10-0896065 (announced on May 7, 2009)

The technical problem to be achieved by the present invention is to solve the problem that the operator must manually place the joints inside the 3D face model every time the 3D face model is changed, and the joint is set up manually by the worker. It provides an automated method to automatically set up joints in a given 3D face model using one 3D face standard model.

According to an embodiment of the present invention, a computer program coupled to a computer and stored in a computer-readable storage medium includes receiving a 3D standard model in which first joints are set up, and having the same geometry as that of the 3D standard model. And receiving a 3D target model and automatically setting second joints of the 3D target model using a target skeleton corresponding to the set of first joints.

A method of automatically setting up joints in a 3D target model using a computer according to an embodiment of the present invention includes receiving a 3D standard model in which first joints having a hierarchical structure are set up, and the geometric structure of the 3D standard model. Receiving the 3D target model having the same geometry, and obtaining a target skeleton by copying the first joints having the hierarchical structure from a 3D standard model in which the first joints having the hierarchical structure are set up; and Calculating the 3D standard model and MBBs of the 3D target model, and using the calculated MBBs, deforming the target skeleton according to the position and size of the 3D target model, and positioning the modified target skeleton in the 3D target model It includes the steps.

A computer according to an embodiment of the present invention includes a processor, a data storage device, and the processor receives a 3D standard model in which first joints having a hierarchical structure are set up and stores the 3D standard model in the data storage device. The 3D target model having the same geometry as the geometry of is received, stored in the data storage device, and has the hierarchical structure from the 3D standard model in which the first joints having the hierarchical structure stored in the data storage device are set up. Copy the first joints to obtain a target skeleton, calculate the MBD of the 3D standard model and the 3D target model, and transform the target skeleton according to the position and size of the 3D target model using the calculated MBBs, The deformed object skeleton is placed in the 3D object model.

Method according to an embodiment of the present invention and the computer program capable of performing the method, when a number of 3D face models are given through 3D scan, the operator manually performs 3D without setting up joints in each of the 3D face models Since joint setup can be performed to automatically set up joints in each of the 3D face models using the information of the standard model, it is possible to increase the efficiency of the joint setup work.

In order to better understand the drawings cited in the detailed description of the present invention, detailed descriptions of each drawing are provided.
1A-1C show 3D face models, joints and skeletons, and joint-set 3D face models as pictures for explaining a conventional joint-based scheme.
2 is a flowchart illustrating a method of automatically setting up joints for generating a face animation of a 3D face model according to an embodiment of the present invention.
3A to 3C show a 3D face standard model, a 3D mesh face model, and a joint set up 3D face standard model to be used in the present invention.
4 shows joints and bones to be described in an embodiment of the present invention.
5 is a diagram for describing a cube having the same geometric structure and a cube having a different geometric structure according to an embodiment of the present invention.
6 is a diagram for describing a face model having the same geometric structure and a face model having a different geometric structure according to an embodiment of the present invention.
7 is a drawing generally defining face regions.
8 is a diagram for defining a face region MBB according to an embodiment of the present invention.
9 is a diagram for defining a face region MBB by extracting feature points or lines of a face according to an embodiment of the present invention.
10 is a diagram for defining a face region MBB value according to an embodiment of the present invention.
11 is a view for explaining the positions of the adjusted joints after adjusting the position of the face root joint according to an embodiment of the present invention.
12 is a diagram illustrating positions of adjusted child joints after adjusting positions of child joints of a face root joint according to an embodiment of the present invention.
13 is a view for explaining the position change of the intermediate joint according to the position change of the end joint according to an embodiment of the present invention.
14A and 14B are diagrams for explaining a position change of intermediate joints according to a position change of child end joints of a plurality of joints according to an embodiment of the present invention.
15 is a diagram illustrating skinning of a 3D face model and chin joints using an influence value according to an embodiment of the present invention.
16 is a block diagram of a computer system capable of carrying out the method illustrated in FIG. 2.
17 is a block diagram of a computer system capable of carrying out the method illustrated in FIG. 2.

2 is a flowchart illustrating a method of automatically setting up joints for generating a face animation of a 3D face model according to an embodiment of the present invention. The processes of automatically setting up joints in a 3D face model according to an embodiment of the present invention (ie, automatically setting up joints in a 3D face model using a computer program) will be described in detail with reference to FIGS. 2 to 17.

The joints used in the joint setup procedures have a hierarchical structure and collectively refer to at least one root joint, at least one intermediate joint connected to the at least one root joint, and at least one end joint connected to the intermediate joint.

The joint setup procedures can be performed by a computer program (or application) stored in a computer readable storage medium to automatically set up joints to create animation of a 3D (dimensional) model in combination with a computer.

In this specification, a 3D face model is exemplarily described as a 3D model, and a face animation is exemplarily described as an animation, but the joint setup procedures according to the present invention automatically set up joints for generating a face animation of the 3D face model Since the present invention is not limited to the processes described above, the present invention can be applied to processes for automatically setting up joints for generating animations of various 3D models.

A computer (computing device 120, computing system 100 or 100A, or processor 122) can execute a computer program stored on a computer-readable storage medium (eg, a non-transitory data storage medium). A generic device.

3A to 3C show a 3D face standard model, a 3D mesh face model, and a joint set up 3D face standard model to be used in the present invention. A joint-set 3D face standard model (FIG. 3C, hereinafter referred to as '3D standard model') is provided to the computer program 124 (S110). According to embodiments, the 3D standard model may be a model that has been manually created in advance by an operator.

A computer program 124 is provided with a 3D standard model (FIG. 3C) in which joints are already set up in a 3D mesh face model (FIG. 3B) corresponding to the 3D facial standard model (FIG. 3A) to enable face animation (S110). .

For example, the 3D standard model of FIG. 3C may be a model set up by the operator so that the face animation is best expressed according to the judgment of the operator setting up the joints.

4 shows joints and bones to be described in an embodiment of the present invention. Figure 4 shows the root joint, the middle joint, the end joints, and the bones. When the position of the joint (eg, root joint, intermediate joint, and / or end joint) is determined, the size and direction of the bone are determined automatically.

5 is a diagram for describing a hexahedron having the same geometrical structure and a hexahedron having the same geometrical structure according to an embodiment of the present invention, and FIG. 6 is a face model having the same geometrical structure and a different geometrical structure according to an embodiment of the present invention These are pictures to explain the model.

A 3D face model (hereinafter referred to as a '3D target model') having the same geometry as the joint-set 3D face standard model (ie, 3D standard model) is provided as a computer program (S120). Step S120 is a step in which a 3D face model (ie, a 3D target model) to be automatically jointly set up by the computer program 124 is provided.

According to embodiments, the computer program 124 receives the 3D object model, determines whether the geometric structure of the received 3D object model and the geometric structure of the 3D standard model are the same, and performs the next step (S130) when the same. can do.

There is a prerequisite that the geometry of the 3D target model that wants to automatically set up the joint should be the same as that of the 3D standard model provided in step S110.

The same geometry is determined by the number of meshes in the 3D target model, the number of polygons and the vertices that make up the mesh, and the connection structure (eg, polygons and vertices). Connection structure) means that the number of meshes of the 3D standard model, the number of polygons and vertices constituting the meshes, and the connection structure are the same.

The size of the hexahedron of FIG. 5 (a) and the size of the hexahedron of FIG. 5 (b) are different, but the number of polygons and the number of vertices of the hexahedron ((a)), and the connection structure (eg, polygons and vertices) Since the number of polygons and the number of vertices of the hexahedron ((b)) and the number of connection structures (e.g., the connection structure determined by polygons and vertices) are the same, the hexahedron ( The geometry of (a)) is the same as that of hexahedron ((b)).

However, the size and shape of the hexahedron of FIG. 5 (b) is the same as that of the hexahedron of FIG. 5 (c), but the number of polygons constituting the hexahedron ((b)), the number of vertices, and connection Since the structure and the number of polygons constituting the hexahedron ((c)), the number of vertices, and the connection structure are different, the geometric structure of the hexahedron ((b)) and the hexahedron ((c)) are different.

The size of the face model of FIG. 6 (a) and the size of the face model of FIG. 6 (b) are different, but the number of polygons and the number of vertices of the face model ((a)), and the connection structure of the face model ( Since the number of polygons in (b) and the number of vertices and the connection structure are the same, the geometry of the face model ((a)) is the same as that of the face model ((b)).

However, the size and shape of the face model of FIG. 6 (b) are the same as those of the face model of FIG. 6 (c), but the number of polygons and the number of vertices constituting the face model ((b)). , Since the connection structure is different from the number of polygons and vertices constituting the face model ((c)) and the connection structure, the geometry of the face model ((b)) and the face model ((c)) The geometric structures are different.

As a method of creating meshes having the same geometric structure, a method of morphing a 3D standard model and fitting it to a 3D target model is used. Since the present invention is not directed to a method of making the geometric structure between two models identical, it is sufficient if a 3D target model having the same structure as the geometry of the 3D standard model is provided to the computer program 124.

The computer program 124 obtains (or calculates) the reference sizes and positions of the 3D standard model and the 3D target model, respectively (S130). That is, step 130 is a step of obtaining the reference sizes and positions of the 3D standard model and the 3D target model, respectively, in order to obtain joints to be automatically applied to the 3D target model. Here, the reference size and the position may mean a MBB ((minimum bounding box), and may specifically mean a face MBB.

Here, the reference size and position (eg, MBB) are feature values used to determine a translator and scale factor for adjusting the positions of the joints of the 3D standard model.

The computer program 124 obtains (or calculates) a reference size and position of each of the 3D standard model and the 3D target model by using MBBs for face regions of the 3D standard model and the 3D target model.

7 is a drawing generally defining face regions, FIG. 8 is a drawing defining face region MBB according to an embodiment of the present invention, and FIG. 9 is for extracting feature points or lines of a face according to an embodiment of the present invention. It is a picture that defines the face area MBB.

The definition of the face regions may vary as illustrated in FIGS. 7A and 7B, but as illustrated in FIG. 8A, the face regions are vertically divided from 'eyebrows' to 'chin lines', In addition, the left and right sides are defined as a space composed of planes of 'two jawlines', and as shown in FIG. 8 (b), the face region may be defined as a space composed of planes from 'nostril' to 'back head'. Can be.

Referring to FIGS. 8A and 9, the computer program 124 automatically detects feature points or lines (eg, green lines) of the face (eg, the face of the 3D standard model and / or the face of the 3D target model). It can detect and determine or determine the top, bottom, left, and right lines for the face region according to the detection result. In addition, the computer program 124 may detect the maximum and minimum vertices in the front-rear direction of the face as shown in FIG. 8 (b) to obtain the front-rear line. In the method described above, the computer program 124 may acquire the MBB value of the face region as shown in FIG. 10.

과

)로 표시되고, 3D 대상 모델의 얼굴 영역 MBB 크기(예컨대, 기준 크기)와 중심점(예컨대, 위치)은 배열들(

와

)로 표시된다. 각 배열(

,

,

, 및

, A로 총칭함)는 3차원 요소 값들(x, y, z)를 포함(또는 저장)하고, 각 요소는 A[x], A[y], A[z]로 표시된다.10 is a diagram for defining a face region MBB value according to an embodiment of the present invention. The size (eg, reference size) and center point (eg, position) of the face region MBB of the 3D standard model obtained with reference to FIGS. 8 to 10 are arrays (

and

), The face area MBB size (e.g., reference size) and center point (e.g., position) of the 3D target model are arrays (

Wow

). Each array (

,

,

, And

, Collectively referred to as A ) include (or store) three-dimensional element values (x, y, z), and each element is represented by A [x], A [y], and A [z].

The computer program 124 generates a target frame, transforms the generated target skeleton, and positions the transformed target skeleton in the 3D target model (S140).

과

)과 크기들(예컨대,

과

)을 이용하여 3D 대상 모델의 위치와 크기에 맞게 상기 대상 뼈대를 변형하고, 변형된 대상 뼈대를 상기 대상 모델에 위치시킨다.In step S140, the computer program 124 copies the set of joints of the joint-established 3D standard model to generate the target skeleton, and the reference positions obtained in step 130 (eg,

and

) And sizes (e.g.

and

) To deform the target skeleton according to the position and size of the 3D target model, and place the modified target skeleton in the target model.

,

,

, 및

)을 이용하여 3D 대상 모델의 얼굴에 다음과 같이 위치시킨다.In step S140, the computer program 124 copies the skeleton of the 3D standard model, and then the face region MBB values obtained in step S130 of the copied 3D standard model skeleton (

,

,

, And

) To place it on the face of the 3D target model as follows.

As shown in Figure 4, the skeleton is made of a hierarchical structure. For example, when the upper joint of the skeleton (referred to as 'parent joint') moves, lower joints (referred to as 'child joints') connected to the upper joint through the skeleton also move. In FIG. 4, the upper joint is the root joint, and the lower joints may be intermediate joints and / or termination joints.

The first operation performed in step S140 is to move the top joint (hereinafter referred to as the 'face root joint') of the face skeleton made up of a hierarchical structure to roughly position the entire face skeleton in the 3D target model.

)는 수학식 1같이 계산된다. 이때

은 3D 표준 모델의 페이스 루트 조인트의 위치이다.The location of the face root joint of the target armature (

) Is calculated as in Equation 1. At this time

Is the location of the face root joint of the 3D standard model.

[Equation 1]

,

, 및

)의 4칙 연산은 원소들(x, y, z) 사이의 4칙 연산으로 수행된다. 여기서,

는 스케일링 벡터로서 X-축, Y-축, 및 Z-축의 스케일링 팩터를 나타낸다.

는 차이 벡터로서, 3D 표준 모델의 중심점과 3D 표준 모델의 페이스 루트 조인트의 위치 사이의 거리(또는 차이)를 나타낸다.At this time, each array (

,

, And

) Is performed as a four-rule operation between elements (x, y, z). here,

Denotes the scaling factors of the X-axis, Y-axis, and Z-axis as scaling vectors.

Is a difference vector, which represents the distance (or difference) between the center point of the 3D standard model and the position of the face root joint of the 3D standard model.

11 is a view for explaining the positions of the adjusted joints after adjusting the position of the face root joint according to an embodiment of the present invention.

When the step (S140) is performed, as shown in Figure 11, the target skeleton is located on the face of the 3D target model, but because the size of the 3D target model and the size of the target skeleton are different from each other, the target skeleton is the It is located outside the face of the 3D target model. Therefore, the computer program 124 adjusts the size of the target skeleton according to the size of the 3D target model by changing the positions of the child joints of the face root joint.

)는 수학식 2에 따라 결정된다. 여기서, 상대 위치는 해당 자식 조인트의 부모 조인트에 대한 상대적인 위치를 말한다.To do this, the relative positions of all child joints connected to the face root joint of the target armature (

) Is determined according to equation (2). Here, the relative position refers to a position relative to the parent joint of the child joint.

[Equation 2]

The computer program 124 adjusts the position of each of the longitudinal joints of the target skeleton using the information of the 3D standard model (eg, joint information for the joint (or joints) of the 3D standard model) (S150).

12 is a diagram illustrating positions of adjusted child joints after adjusting positions of child joints of a face root joint according to an embodiment of the present invention.

Even if step S140 is performed, since the used target skeleton is not made for the target 3D model, the target skeleton may slightly penetrate the target 3D model as shown in FIG. 12. The computer program 124 adjusts the position of the end joints because the drilled joints are end joints located at the end of the hierarchy of the target skeleton.

How the computer program 124 adjusts the positions of the end joints is as follows.

라 하고 상기 3D 표준 모델의 버텍스 위치를

라고 했을 때, 두 위치들(또는 두점들) 사이의 길이는

이므로, 컴퓨터 프로그램(124)은 대응되는 두 점들 사이의 거리가 가장 작은 버텍스를 찾는다. 찾아진 버텍스를

라고 했을 때, 상기 종단 조인트의 위치(

)는 수학식 3에 따라 계산된다.First, the computer program 124 finds the closest vertex among the 3D standard model vertices and the end joint of the 3D standard model bone. The position of the end joint

And the vertex position of the 3D standard model

Called When done, the length between two locations (or two points)

Therefore, the computer program 124 finds the vertex having the smallest distance between two corresponding points. Find the vertex

Is the position of the end joint (

) Is calculated according to equation (3).

[Equation 3]

는 찾아진 버텍스(

)에 대응되는 3D 대상 모델에서의 버텍스의 위치이다. 3D 표준 모델의 기하학적 구조와 3D 대상 모델의 기하학적 구조가 동일하기 때문에, 찾아진 버텍스(

)의 아이디를 알면, 컴퓨터 프로그램(124)은 찾아진 버텍스(

)에 대응하는 3D 대상 모델의 버텍스(

)를 찾을 수 있다.here

Is the vertex found

) Corresponding to the position of the vertex in the 3D target model. Since the geometry of the 3D standard model and the geometry of the 3D target model are the same, the vertices found (

), The computer program 124 finds the vertex (

) Corresponding to the 3D target model's vertex (

).

The computer program 124 adjusts the positions of the intermediate joints of the target skeleton using the position information of the adjusted end joint (or adjusted end joints) (S160).

The processes up to step S150 are to finally determine the positions of the top joint (ie, face root joint) and end joints with respect to the joints of the 3D target model. In step S150, the computer program 124 finally determines the positions of the intermediate joints located in the middle of the skeleton.

Because the position of the middle joints is fine, the visual effect on the face animation may be insignificant compared to the position of the other joints, but the computer program (124) is used to create the skeleton of the 3D target model as closely as possible to the standard skeleton of the 3D standard model. ) Adjusts the positions of the intermediate joints.

How the computer program 124 adjusts the positions of the intermediate joints is as follows.

)를 바로 전단계(S150)에서 조정된 종단 조인트들 각각의 위치 변화량의 평균 만큼 변화시켜 결정한다.The computer program 124 is a new location of the intermediate joint having the end joint as a child joint (

) Is determined by changing by the average of the position change amount of each of the end joints adjusted in the previous step (S150).

13 is a view for explaining a change in the position of the intermediate joint according to the position change of the end joint according to an embodiment of the present invention, Figure 14A is a change in the position of the child end joints of a plurality of joints according to an embodiment of the present invention It is a picture to explain the change of position of the intermediate joints.

, i=1 또는 2)가 단계(S150)에서 위치 변화량(D, 또는

, i=1 또는 2)만큼 변한다면, 중간 조인트의 새로운 위치(

)는 수학식 4와 같다.13 and 14A, the end joint (CJ or

, i = 1 or 2) is the position change amount (D, or) in step (S150)

, i = 1 or 2), the new position of the middle joint (

) Is as in Equation 4.

[Equation 4]

In Fig. 13, CJ represents the initial position of the end joint, D represents the amount of change, CJ 'represents the new position of the end joint changed by the amount of change (D), P represents the initial position of the intermediate joint, and P' represents It represents the new position of the intermediate joint changed by the amount of change (D).

In FIG. 14A, each of CJ ₁ and CJ ₂ represents the initial position of the end joint, each of D ₁ and D ₂ represents the amount of change, and each of CJ ' ₁ and CJ' ₂ is the end changed by each amount of change (D ₁ and D ₂ ). The new position of the joint, P indicates the initial position of the intermediate joint, and P 'indicates the new position of the intermediate joint changed by the average amount of change (D). The average change amount D is the arithmetic mean of the change amounts D ₁ and D ₂ .

In the case of an intermediate joint without a termination joint (for example, when the child joint of the intermediate joint 1 is intermediate joint 2 as shown in FIG. 14B), the position change of the intermediate joint 1 is described before the position of the intermediate joint 1 is updated. Calculate the same as the change in the position of the end joint.

The computer program 124 uses the skinning information of the 3D standard model to skin the target skeleton and the 3D target model (S170).

Step (S170) is to assign (or assign) weighting factors indicating the degree of influence between the joints constituting the target skeleton and the vertices constituting the 3D target model to the vertices of the 3D target model. to be.

15 is a diagram for explaining skinning of a 3D face model and jaw joints using an influence value according to an embodiment of the present invention. In Figure 15, the vertices of the 3D target model affected by the jaw joints are brightly displayed. The darker the color in the 3D target model, the more affected the joints are.

In the present invention, since the geometry and skeleton structure of the 3D target model are the same as those of the 3D standard model, the influence values of the 3D standard model can be used as the influence values of the 3D target model. The computer program 124 uses the influence values applied to the vertices of the 3D standard model and the IDs of the vertices, so that the 3D standard is assigned to vertices having IDs of the same vertices as the 3D standard model for the 3D target model. The influence values of the model are applied as they are.

FIG. 16 is a block diagram of a computer system capable of carrying out the method illustrated in FIG. 2. Referring to FIG. 16, the computer system 100 includes a 3D scanner 110, a computing device 120, and a data storage device 130.

The 3D scanner 110 generates a 3D image IM corresponding to the 3D target model 134 and transmits the 3D image IM to the computing device 120.

The computing device 120 includes a processor 122 capable of executing the computer program 124 described herein, and the processor 122 is configured to generate a face animation of a 3D face model (eg, 3D target model). A computer program 124 can be executed that can perform a method of automatically setting up joints. The computing device 120 may store the 3D standard model 132 and the 3D target model 134 in the data storage device 130. The data storage device 130 may be a hard disk drive (HDD) or a solid state drive (SSD) included in the computing device 120 such as a PC. The data storage device 130 stores the computer program 130, and the computer program 130 can be loaded into the processor 122 and executed by the processor 122.

17 is a block diagram of a computer system capable of carrying out the method illustrated in FIG. 2. Referring to FIG. 17, the computer system 100A includes a computing device 120, a data storage device 130, and a network database 150 that can exchange data with the computing device 120 through a communication network. Can be.

In FIG. 16, the 3D image IM corresponding to the 3D target model 134 is provided from the 3D scanner 110 to the computer program 124, but in FIG. 17, the 3D target model 134 communicates from the network database 150 It is provided as a computer program 124 running on the processor 122 via a network.

The first joints may refer to joints set up in the 3D standard model, and the second joints are automatically set up in the 3D target model based on the first joints (eg, the target skeleton that is the set of the first joints). Can mean joints.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100, 100A: computer system
110: 3D scanner
120: computing device
122: processor
124: computer program
130: data storage device
150: network database

Claims (10)

A computer program associated with a computer and stored in a computer-readable storage medium, the computer program comprising:
Receiving a 3D standard model in which the first joints are set up;
Receiving the 3D target model having the same geometry as the geometry of the 3D standard model; And
And automatically setting up second joints of the 3D target model using a target skeleton corresponding to the set of first joints. The method of claim 1, wherein automatically setting the second joints of the 3D target model,
Obtaining a MBB (minimum bounding box) of each of the 3D standard model and the 3D target model;
Copying the target skeleton;
Transforming the target skeleton according to the position and size of the 3D target model using the obtained MBBs, and positioning the modified target skeleton in the 3D target model; And
And adjusting the positions of the second joints using the position information of the joints of the 3D standard model. According to claim 2,
When the joint of the target skeleton is a hierarchical structure including a root joint, at least one intermediate joint connected to the root joint, and at least one end joint connected to the at least one intermediate joint,
Adjusting the positions of the second joints using the position information of the joints of the 3D standard model may include:
Positioning the root joint in the 3D target model;
Adjusting the position of the at least one end joint: and
And adjusting the position of the at least one intermediate joint using the adjusted position information of the at least one end joint. According to claim 3, Adjusting the position of the at least one end joint,
Finding a vertex closest to a termination joint among the first joints among vertices of the 3D standard model; And
And adjusting the position of the at least one end joint using a vector corresponding to a distance difference between the found vertex and the end joint of the first joints. 5. The method of claim 4, wherein adjusting the position of the at least one intermediate joint is stored in a computer readable storage medium that determines the position of the at least one intermediate joint using a displacement vector of the at least one end joint. Computer program. Receiving a 3D standard model in which first joints having a hierarchical structure are set up;
Receiving the 3D target model having the same geometry as the geometry of the 3D standard model;
Obtaining a target skeleton by copying the first joints having the hierarchical structure from a 3D standard model in which the first joints having the hierarchical structure are set up;
Calculating MBBs (minimum bounding boxes) of the 3D standard model and the 3D target model; And
Using the computed MBB to transform the target skeleton to fit the position and size of the 3D target model, and placing the deformed target skeleton in the 3D target model. How to set up. The method of claim 6,
A method of automatically setting up joints in a 3D target model using a computer, the method further comprising adjusting positions of some joints among the first joints constituting the target skeleton using information of the 3D standard model. The method of claim 6,
Adjusting a position of a longitudinal joint among the first joints constituting the target skeleton using information of the 3D standard model;
Adjusting the position of the intermediate joint connected to the adjusted end joint using information on the position of the adjusted end joint; And
A method of automatically setting up joints in a 3D target model using a computer, the method further comprising skinning the target skeleton and the 3D target model using skinning information of the 3D standard model. Processor; And
Including a data storage device,
The processor,
The 3D standard model having the first joints having a hierarchical structure is received and stored in the data storage device,
Receiving the 3D target model having the same geometry as the geometry of the 3D standard model and storing it in the data storage device,
Copies the first joints having the hierarchical structure from a 3D standard model in which the first joints having the hierarchical structure stored in the data storage device are set up to obtain a target skeleton
Calculate MBBs of the 3D standard model and the 3D target model,
Transform the target skeleton to fit the position and size of the 3D target model using the calculated MBBs,
A computer that places a deformed object skeleton on the 3D object model. The method of claim 9, wherein the processor,
Adjusting the position of the end joint among the first joints constituting the target skeleton using the information of the 3D standard model,
Adjust the position of the intermediate joint connected to the adjusted end joint using the information on the position of the adjusted end joint,
A computer for skinning the target skeleton and the 3D target model using skinning information of the 3D standard model.

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