Facing Ratio - Arnold for Maya

Further Reading
See Utility Shaders in the Arnold User Guide for the full shader documentation.

This shader returns the absolute value of the dot product between the shading normal and the incoming ray direction.

Note:

A tutorial that shows how to use the facing_ratio to create a toon shader can be found here and here.

_{'Heat map' effect using a facing_ratio -> v_coord of ramp_rgb}

_{facing ratio -> opacity of standard_surface shader}

^{_{Pepe model by Daniel M. Lara (Pepeland)}}