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Detail-kept geometrical model deformation method using grid subdivision

A mesh subdivision and geometric model technology, applied in 3D modeling, image data processing, instruments, etc., can solve problems such as the inability to retain detailed geometric features, and achieve real and natural results.

Inactive Publication Date: 2012-06-20
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the traditional model deformation based on differential coordinates cannot better preserve the detailed geometric features

Method used

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  • Detail-kept geometrical model deformation method using grid subdivision
  • Detail-kept geometrical model deformation method using grid subdivision
  • Detail-kept geometrical model deformation method using grid subdivision

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Embodiment Construction

[0027] Now in conjunction with accompanying drawing, the present invention is described in detail:

[0028] The specific execution steps of the inventive method are as follows: figure 1 shown. First, step (1) inputs the grid initial model to be processed according to the computer , interpret the model file to obtain the vertex geometry information and topology information of the model, and load the data structure related to the construction at the same time, that is, complete Initialization of each element.

[0029] The low-frequency model in the above step (2) The calculation of is through the initial model Each vertex in Find the limit position after mesh subdivision , To number the vertices, the solution method is based on the following formula:

[0030] (1)

[0031] in, for and vertices The number of adjacent vertices. is defined as follows:

[0032] (2)

[0033] is defined as:

[0034] ...

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Abstract

The invention relates to a detail-kept geometrical model deformation method using grid subdivision. The detail-kept geometrical model deformation method comprises the following steps of: by virtue of an idea of multi-resolution mesh geometrical model edit, dividing an initial model into a low-frequency model and a high-frequency model, wherein a limit model which is taken as the low-frequency model is established by a grid subdivision technology and a displacement difference between the initial model and the low-frequency model is taken as the high-frequency model; performing differential coordinate geometrical model deformation by operating the low-frequency model by a user; and according to stored geometrical details, reconstructing a grid vertex so as to realize the differential coordinate deformation with kept geometrical details. According to the detail-kept geometrical model deformation method using the grid subdivision, the unnatural phenomenon in the differential coordinate deformation is remedied by correcting the normal direction of the vertex after being subjected to the differential coordinate deformation, and the geometrical details on the surface of the model can be kept well in the deforming process, so that results are real and natural.

Description

Technical field [0001] The present invention is a computer graphics and geometric modeling technology. It involves a detailed method of using a grid subdivision to retain the geometric model deformation method. Background technique [0002] With the continuous development of computer science, the technology products brought by graphics are increasingly integrated into people's daily life.Rendering of dazzling film special effects, three -dimensional animation, and realistic game scenes have greatly improved the level of film and television culture and entertainment.Virtual experiments, simulation scenarios analysis, and computer auxiliary geometric design methods are changing traditional industrial design and production.Grid geometric model deformation is one of the core technologies of these fields. The work done by the present invention is to realize the dynamic deformation effect of the grid geometric model. [0003] The deformation of grid geometry mainly studies the initial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/30
Inventor 赵乃良李人可
Owner HANGZHOU DIANZI UNIV
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