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15.2.1 General attributes

 
General section of the ifmNormalMapping Attribute Editor
 
Normal Map
Connects the RGB values from the normal map texture with the ifmNormalMapping node.
 
Type
Defines how to read the normal map color values
 
Color:
Use this attribute if your using a normal map with just postive RGB values ( RGB 0 - 1 or 0 -255).
Vector:
Use this attribute if your using a normal map with negative and positive values ( This may apply when using exr textures as normal maps )
 
 
General section of the ifmNormalMapping Attribute Editor
 
Tangent/Bitangent
There is not any sort of standardization for the creation of normal maps. But many normal maps are defined as tangent space normal maps with RGB matching to XYZ. As a rule of thumb you can say when looking on such a normal map in a standard image viewer usually blue is flat, normals pointing upwards are cyan and normals pointing downwards are magenta. This is applies to the default setting in the attribute Tangent/Bitangent which is Red Green / XY. You can change this mapping using the different settings you find in the pulldown menu.