MatCap algorithm for texture sampling based on line-of-sight direction

Abstract

The invention relates to a MatCap algorithm for texture sampling based on a line-of-sight direction. A new transformation matrix is used for transforming the new Matcap algorithm of vertex normals, obtained results are equally accurate at any position in the field of view, there is no offset, and accurate texture sampling based on the line-of-sight direction is achieved.

Description

technical field [0001] The invention relates to the technical field of computer graphics processing, in particular to a MatCap algorithm based on line-of-sight texture sampling. Background technique [0002] MatCap (Material Capture) is a common computer graphics technology at present. It uses the model surface normal to transform from world space to camera space, and then maps the value range of the transformed xy component from [-1, 1] to [0, 1], and then use it as the UV value to sample the texture. This approach is cheap on computer performance and works well on non-flat surfaces. In common applications, the texture used by Matcap looks like a sphere that simulates a certain material, making the model look the same texture. The famous sculpting software Zbrush uses Matcap material. But there will be following defects: [0003] 1. When the model is completely flat, because the normal direction of all vertices is the same, the UV coordinates sampled on the texture are a...

AI Technical Summary

Problems solved by technology

[0003] 1. When the model is completely flat, because the normal direction of all vertices is the same, the UV coordinates sampled on the texture are also the same, so it will be displayed as a single color;

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