A lot of things going on in this commit:
- added tangents computation for geometries
- mesh must have UV coordinates
- to be called explicitly once geometry is loaded like this: geometry.computeTangents()
- tangents are stored in Vertex objects
- quads are not solved properly (though workaround hack seems to work at least somehow, as far as each vertex appears at least somewhere)
- extended VBOs in WebGLRenderer to include tangent streams (when available)
- added "normal" shader to ShaderUtils (to be used with MeshShaderMaterial)
- Blinn-Phong with one directional and one point light (7 varyings gone, just one spare)
- normal maps are in tangent space
- displacement maps use simple luminance value (could be changed if better precision is needed)
- displacement mapping uses vertex texture fetch
- this requires GPU with Shader Model 3.0
- not currently supported in ANGLE
- for this, added "supportsVertexTextures" method to WebGLRenderer API, so that application can handle this
TODO:
- maybe image array loader should go into TextureCube.js so that people could just reuse the code
- it may be worth to be able to specify different combination of environment map and underlying material (in single render pass),
currently color/color map/environment map are multiplied, though addition also produces very interesting looking materials
alteredq
Mr.doob