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Parameters
"string viewchannel" defaults to Nn and is one of:
- Nn - x,y,z mapped to rgb. <0,0,0> is middle grey.
- Vn - x,y,z mapped to rgb. <0,0,0> is middle grey.
- VLen - scalar mapped to intensity.
- Tn - x,y,z mapped to rgb. <0,0,0> is middle grey.
- ST - s mapped to red, t to green.
- UV - u mapped to red, v to green.
- InsideOutside - The dot product of V and N is used to determine whether a surface is outside or inside. Outside is mapped to green, inside is mapped to red.
- P - x,y,z mapped to rgb. <0,0,0> is middle grey.
- dPdu - x,y,z mapped to rgb. <0,0,0> is middle grey.
- dPdv - x,y,z mapped to rgb. <0,0,0> is middle grey
- Po - The surface location before displacement
- Non - Normalized shading normal before displacement