Primitive Attribute VEX node
Evaluates an attribute for a given primitive at the specified uv parametric location.
This operator evaluates an attribute for a given primitive at the specified uv parametric location. The result is stored in 'adata', which can be one of the following types:
floating-point integer vector (three floats) vector4 (four floats) matrix3 (nine floats) matrix (sixteen floats)In either case, if the attribute data is of a smaller size than 'adata', an error of 0 will result. A value of 1 is returned upon successful completion.
For example, if attribute Cd is a vector, 'adata' cannot be a matrix or any another structure which can store more than three values.
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