Gaffer 1.6.21.4

[murraystevenson]

Fixes

• RenderMan : Added IECORERENDERMAN_LEGACY_TEXTURECOORDINATE_BEHAVIOUR environment variable, as a partial opt-out from the bugfix introduced in 1.6.21.0. Setting the variable to a value of 1 causes USD texCoord3f primitive variables to be exported to RenderMan as point rather than float[3], as they were prior to 1.6.21.0. This is not correct, but allows folks who have been authoring __Pref as texCoord3f to temporarily continue to work as before.

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This discussion was created from the release Gaffer 1.6.21.4.