Blender Asked by Angel Doodles on September 29, 2021
So i made the mout on a plane and used a mix shader and transparent shader to make it transparent, i only want the external freestyle line, and want the mouth highlighted as well but it only out lines the plane
With Freestyle, no, this is not possible; Freestyle acts on the geometry, not the rendered alpha.
However, it is possible to mimic Freestyle in the compositor by using edge detection to spot the transition between regions - in this case from opaque (low alpha) to transparent (high alpha).
See https://blender.stackexchange.com/a/186173/29586 for an example using the Normal and the Depth to detect edges - in your case you could use the same technique on the Alpha as is used on Depth. This will detect the edges of transparency.
Answered by Rich Sedman on September 29, 2021
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