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Grid-free surface drawing method with sharp feature

A meshless, sharp technology, applied in image data processing, 3D modeling, instruments, etc., can solve problems such as inability to process, achieve easy implementation, simplify the modeling process, and achieve good results

Inactive Publication Date: 2015-07-08
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still cannot handle some complex situations

Method used

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  • Grid-free surface drawing method with sharp feature
  • Grid-free surface drawing method with sharp feature
  • Grid-free surface drawing method with sharp feature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] Such as figure 1 As shown, a mesh-free surface drawing method with sharp features includes the following steps:

[0040] The first step is to use the point-edge hybrid model to model the surface of the object to be drawn before drawing;

[0041] In the point-edge hybrid model, P is used to represent the surface point; and v is used to represent the point on the edge in the sharp feature, and it is called the edge point. The mesh-free surface is composed of a number of smooth surfaces s, and it is stipulated that sharp features only appear between two or more adjacent smooth surfaces. For each smooth surface s, there is

[0042] s={P n , L t }

[0043] Where P n It is a collection of n surface points, n>0, each surface point contains the attributes of the point, including the point's position, normal vector, color value and the radius of the splat represented by the point; L t Is a collection of t cutting rings, t≥0. Each cutting ring contains a sequence of edge points. Connect...

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PUM

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Abstract

The invention relates to a grid-free surface drawing method with a sharp feature. The grid-free surface drawing method with the sharp feature includes that firstly, surface of an object to be drawn can be molded by utilizing a point-edge-mixed model; secondly, the surface points of the model and corresponding cut edges are related and relevancy results are kept; thirdly, all cut edges of the model are projected on an observing plane to form projection cut edges; fourthly, the surface points of the model are projected on the observing plane to form ovals, wherein the oval are overlapped mutually; fifthly, each oval projected on the observing plane can be cut through a zigzag clipping algorithm after utilizing the projected cut edges in the third step; and sixthly, after each oval projected on the observing plane is cut, pixel points on the whole observing plane can be normalized to obtain the grid-free surface of the object to be drawn. Compared with the prior art, the grid-free surface drawing method with the sharp feature has the advantages of being stable, reliable, convenient to achieve, suitable for practical engineering application extremely, and the like.

Description

Technical field [0001] The invention relates to a mesh-free surface drawing method, in particular to a mesh-free surface drawing method with sharp features. Background technique [0002] The output of the 3D scanning system is sampled point elements, and the set of point elements obtained by this technology can accurately express the geometric shape of the object. Since there is no connection relationship between each point element, and no need to save topological structure information, it is particularly flexible and simple when dealing with complex three-dimensional objects. Therefore, point-based meshless geometric modeling and rendering have received more and more attention in the field of computer graphics. [0003] The use of point elements as basic elements for surface drawing was first proposed by Levoy et al. After that, various mesh-free surface rendering methods appeared, such as methods using image space surface reconstruction technology, QSplat system, and methods us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/30
Inventor 顾力栩戴春锋
Owner SHANGHAI JIAOTONG UNIV