在Three.js中生成顶点法线以使用折角平滑阴影 [英] Generating vertex normals for smooth shading with crease angle in Three.js

问题描述

Three.js的 JSON模型格式.它指定了顶点的位置和面-有时是三角形，有时是四边形，有时是带有材质索引，有时没有.

I have several objects in Three.js's JSON Model Format. It specifies vertex positions, and faces -- sometimes triangles, sometimes quads, sometimes with material indices and sometimes not.

但是这些文件都没有指定顶点法线.

However none of these files have vertex normals specified.

我想要一种可以在一组网格面上计算此类法线的算法.我想指定一个角度限制，超过该角度将显示折痕(在顶点处，相邻面不共享法线.)

I want an algorithm that can calculate such normals over a set of mesh faces. I'd like to specify an angular limit beyond which a crease is shown (normals are not shared by adjacent faces at a vertex.)

在我自己编码之前，我想知道这是否已经存在于Three.js中或其他可用的地方?

Before coding this myself I wondered, does this exist either in Three.js already or somewhere else that's usable?

推荐答案

唯一可用的是

geometry.computeFaceNormals();
geometry.computeVertexNormals();

请参阅该算法的来源.

three.js r.55

three.js r.55

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