In this case only diffuseMatColor really matters, other values are constant.
It improves performance on GLES renderer and it's also noticeably faster for GL on desktop.
For example:
- fps increased for me from 60 to 69 on Hacienda with intel HD 4000
- from 43 to 49 on lighthouse
There is much less difference on nvidia graphics card, but still it gives small performance improvement.
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