Research on improvement calculating method for surface normal line of 3D model

Lei Cheng; Haiyan Liu

doi:10.1117/12.2030631

19 July 2013 Research on improvement calculating method for surface normal line of 3D model

Lei Cheng, Haiyan Liu

Proceedings Volume 8878, Fifth International Conference on Digital Image Processing (ICDIP 2013); 88784A (2013) https://doi.org/10.1117/12.2030631
Event: Fifth International Conference on Digital Image Processing, 2013, Beijing, China

Abstract

Introduces the basic principle of Geometric Modeling for 3D model, and three kinds of usual methods to calculate the vertex normal line on its surface are mentioned. These usual methods make most of the 3D model with smooth surface looks well when they were rendering. But a model with obviously sharp corner and edge would not be rendered correctly. To solve this problem, the Hard Edge Splitting method is bringing out, by calculating to find out the sharing edge with the angles bigger than a threshold of two adjacent triangles. In each triangle, calculate the normal of these two vertexes on the edge line. It makes the lighting calculation for surfaces at each side of the edge correctly. The geometrical features of the model can be shown in truth.

Citation Download Citation

Lei Cheng and Haiyan Liu "Research on improvement calculating method for surface normal line of 3D model", Proc. SPIE 8878, Fifth International Conference on Digital Image Processing (ICDIP 2013), 88784A (19 July 2013); https://doi.org/10.1117/12.2030631

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