Controls the effect of the Region Map. You can attach a PTEX-based texture map to this attribute to control where the region map has greater and lesser effect.
A value of 0.0 means the area should ignore region maps while a value of 1.0 means that the maps should be completely respected. Any value between 0.0 and 1.0 result in non-region guides being dampened by that amount. A Region Mask can be used to fade out the region control.
The region map is a PTEX-based texture map that you can attach to this attribute. Use region maps to divide your underlying surface into different regions, by painting each region a different color. The guides and grooming in each region only affect the primitives in the same region.
Browse to the directory where region maps are stored. This directory may be an absolute path or a relative path based on the Collections data path.
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