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This node is used to output a smooth roll-off between two vectors. It can be used for an edge falloff effect in materials, or for artistic control beyond a simple dot product operation.
Create an edge falloff color for Karma
First input vector. For an edge falloff shader, this vector should point towards the eye/camera.
Second input vector. For an edge falloff shader, this input should be the surface normals.
Push or pull the facing ratio towards 1 or 0.
Sharpen or soften the facing ratio.
Apply a gamma curve to the output.
Invert the output signal.
Values are always facing towards Input 1. This is equivalent to the absolute value of the dot product of the two input vectors.