Difference between revisions of "Reference:Aoi Pattern"
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Revision as of 19:05, 15 March 2012
The aoi
pattern can be used with pigment
, normal
and texture
statements. The syntax is as follows:
pigment { aoi pigment_map { [0.0 MyPigmentA] ... [1.0 MyPigmentZ] } } normal { aoi normal_map { [0.0 MyNormalA] ... [1.0 MyNormalZ] } } texture { aoi texture_map { [0.0 MyTextureA] ... [1.0 MyTextureZ] } }
It gives a value proportional to the angle between the ray and the surface; for consistency with the slope pattern, values range from 0.5 where ray is tangent to the surface, to 1.0 where perpendicular; in practice, values below 0.5 may occur in conjunction with smooth triangles or meshes.
Note: This differs from the current MegaPOV implementation, where the values range from 0.5 down to 0.0 instead. If compatibility with MegaPOV is desired, it is recommended to mirror the gradient at 0.5, e.g.:
pigment { aoi pigment_map { [0.0 MyPigment3] [0.2 MyPigment2] [0.5 MyPigment1] [0.8 MyPigment2] [1.0 MyPigment3] } }