The tangent version would not be susceptible to triangle seams. The
mi_bump_basis tries to compute bump vectors (tangent/binormals) based on
individual triangles, irrespective of neighbours (since mental ray doesn't
support topological data). Instead, the tangent op averages tangents over
edges that neighbour a vertex. This gives a much better behaved tangents.
CAV is a color-at-vertices cluster property.
- ½
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