Ken Pruiksma 4c12e9c5ab
Refactoring the LTC quad and polygon lights ( #1881 ) ...
* Refactoring the LTC quad and polygon lights to clip the light to the normal hemisphere before applying the LTC matrix. This prevents specular light leaking from behind the surface. Diffuse and specular contribution are now calculated at the same time to avoid clipping the polygon twice. Added a cheaper diffuse integration function that's accurate enough for diffuse. Also added a commented out alternate specular integration for platforms with poor acos() accuracy.
Signed-off-by: Ken Pruiksma <pruiksma@amazon.com >
* PR review feedback - typo and some saturate() protection
Signed-off-by: Ken Pruiksma <pruiksma@amazon.com >
* Making branch more explicit from review feedback.
Signed-off-by: Ken Pruiksma <pruiksma@amazon.com >
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Ken Pruiksma
4c12e9c5ab