Triangular mesh data stretching method and triangular mesh data stretching system

Abstract

The invention belongs to the technical field of image processing, and provides a triangular mesh data stretching method which includes that the data range of a triangular mesh is chosen; the chosen triangular mesh is projected on a high-order curved surface, a control peak is generated; the control peak is stretched, the curve shape of the triangular mesh is changed; sampling is carried out back to the triangular mesh. The invention further provides a triangular mesh data stretching system correspondingly. Therefore, stretching of a partial area can be achieved by controlling the displacement of a small number of control peaks, and control cost is low.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and system for stretching triangular grid data. Background technique [0002] Geometric modeling technology refers to the organization of data types and data structures in the computer to represent the shape and material characteristics of objects in three-dimensional space. At present, it is widely used in 3D games / animation, film special effects, geological models, molecular models, medical digitization, digital cities and other fields. The geometric model of 3D space is called 3D model for short. There are three representation methods: wireframe model, surface model and solid model, among which surface model is the most widely used, and triangular mesh data is a common form of surface model. Editing, deformation, splicing and other operations of triangular mesh data are common techniques in geometric modeling. The difficulty of triangular mesh data deformat...

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Problems solved by technology

[0003] Various existing algorithms, such as FFD (Free-Form Deformation, FFD) algorithm series, including DFFD\EFFD\RFFD\NFFD algorithms based on FFD, are difficult to control the deformation area of ​​DFFD and EFFD algorithms, while for RFFD and NFFD algorithms Then the deformation is implemented by moving the control vertices or modifying the weight factors. At the same time, because the influence of the deformation of the weight factor model is not intuitive, it is generally difficult to achieve the required deformation by modifying the weight factors.

[0004] In summary, the existing triangular grid data stretching method obviously has inconvenience and defects in actual use, so it is necessary to improve it

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