When using a coarse approximation of an object and imitating a smooth surface (by bending normals away from the geometry normal)
you may find shadow artifacts.
To correct this try the following:
- Use fine approximation to fit the surface more precisely (see Approximation styles)
- Disable Casts Shadows for the object to avoid self-shadowing (see Render Stats)
- Use a separate shadow casting object to cast shadows onto other objects
- Adjust the Ray Offset attribute on a per-object basis (see mental ray Ray Offset)
- Use shadow maps with a Bias instead of raytraced shadows, if possible (see Shadow Map Attributes)
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