2008

Corrected normal maps render more smoothly, without discontinuity.
The arrows show how the maps are correctly aligned to wrap around the pant legs.
Noise when Rendering a Normal Bump Map with the mental ray
Renderer
If you use the mental ray renderer to render a normal bump map, and the
model has overlapping faces (for example, where the low-resolution and
high-resolution objects overlap in space), then the normal bump map can
show noise where the faces overlap.
Troubleshooting Normal Bump Maps | 6193