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OSL built-in displace() and bump() were documented but never implemented #887

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OSL built-in displace() and bump() were documented but never implemented #887

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Commits on May 7, 2018

  1. OSL built-in displace() and bump() were documented but never implemented 

    Add them now. Also, an additional variety that takes a vector offset in
a non-common space.

There's no good reason why these were never implemented. I think that
people just used the `P += ...; N = calculatenormal(...)` idiom
directly. But they were always documented in the OSL Language Spec, so I
see no reason not to add them now.
    @lgritz
    lgritz committed May 7, 2018
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