Geometric mesh model deformation method based on oblique ellipsoid domain influence convex hull

A grid model and ellipsoid technology, which is used in the deformation of geometric grid models in computer modeling and design, and the processing of complex geometric models, can solve problems such as difficulty in effectively maintaining grid model features.

Inactive Publication Date: 2017-07-28
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0004] To sum up, the existing mesh deformation techniques try to ensure the smoothness and uniformity of the global deformation, so it is difficult to effectively maintain the characteristics of the mesh model.

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  • Geometric mesh model deformation method based on oblique ellipsoid domain influence convex hull
  • Geometric mesh model deformation method based on oblique ellipsoid domain influence convex hull
  • Geometric mesh model deformation method based on oblique ellipsoid domain influence convex hull

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Embodiment Construction

[0077] The present invention will be further described below in conjunction with drawings and embodiments.

[0078] Embodiments of the present invention and its implementation process are as follows (further improve the embodiment, check the integrity of the embodiment, and check whether the letter names are explained uniformly and missing):

[0079] Step 1: Import the mesh model to be deformed, Figure 4 is the example geometric grid model diagram of the present invention.

[0080] The instance geometric mesh model has 3789 patches and 1926 vertices. In the printing coordinate system, the transformed grid model, the coordinate extremum of the vertices of the convex bounding box: [x min ,x max ,y min ,y max ,z min ,z max ]=[0.0000,11.6360,0.0000,9.3149,0.0000,12.3809], coordinates of the center of the convex bounding box: (5.8180,4.6574,6.1905), coordinates of the centroid of the model: (8.0134,4.1450,3.6348), space of the convex bounding box: (11.6360 ,9.3149,12.3809)...

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Abstract

The invention discloses a geometric mesh model deformation method based on oblique ellipsoid domain influence convex hull. The method includes selecting a control vertex to be deformed according to regions of interest, deciding to select an influence region in a logically forward or backward direction from a global mesh vertex, establishing a global or local oblique ellipsoid domain influence convex hull, traversing an annular neighborhood of the control vertex to be deformed, calculating Laplacian coordinates at the mesh vertex, performing least squares restrained deformation for the region to be deformed, and overlapping the region to be deformed and a non-influence convex hull region to obtain a deformation model. According to the invention, the minimum volume enclosing oblique ellipsoid domain is used for representing the influence region of the control vertex, the influence range of the deformation vertex is enveloped precisely, the drawback of rotational distortion of a local vertex in the zooming and rotation transformation of the Laplacian differential coordinates can be overcome, the deformed mesh patch normal vector or vertex normal vector transitions smoothly and uniformly, better smoothness is gained, and the geometric mesh model deformation of a region of geometry adjacency with a non-connected topology is facilitated.

Description

technical field [0001] The invention relates to a complex geometric model processing method in the field of advanced manufacturing technology, in particular to a deformation method of a geometric grid model in computer modeling design. Background technique [0002] Mesh deformation refers to obtaining a new surface under geometric constraints. As an important modeling method, mesh deformation technology has become a very active research hotspot in the field of computer graphics, and has been widely used in modeling design, deformation design, film and television animation and other fields. Lagrangian coordinates are the coordinates embedded in the particle, moving and deforming with the object, also known as material coordinates or body coordinates. Euclidean coordinates are coordinates fixed in space, also known as spatial coordinates or fixed coordinates. The types of mesh deformation include stretching deformation, compression deformation, bending deformation and twisti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/30G06F17/50
CPCG06F30/20G06T17/30
Inventor 徐敬华王康张树有谭建荣
Owner ZHEJIANG UNIV
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