KhronosGroup / KhronosGroup/glTF-Sample-Viewer
No specular from lights when roughness=0
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Description
There are no specular highlights when roughness = 0.0
The likely cause for this is that the NDF function needs to limit roughness to a small value.
Since glTF does not use solid angle for lights, most engines use a simplified model where the NDF will create specular lobe using roughness.
However, values of 0.0 roughness will not produce any specular at all.
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