Specification and reference implementation for the OpenPBR Surface shading model
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portsmouth opened this issue 9 months ago · comments
Since we explicitly say not to use values $\ge 1$:
In practice we restrict to the range $\alpha \in [0,1]$, as $\alpha>1$ does not produce a plausible rough appearance.
But right now these ranges are $[0, \infty]$: