Backface Mask by Jens Kafitz
Backface Mask will try to create a mask based on opposite normals.
This is useful for example to isolate interior faces of clothing (think jacket lining)
Isolating interior faces of this gun turret using the Backface Mask:
Will expand the threshold for what is considered interior faces
Inverts the Normal evaluation on your model - exterior faces will become interior ones and vice versa.
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