Hey there Blender Community,
I am attempting to render just the outline of a fully transparent object on a transparent background (in Cycles). Using a material index pass and an inverse Sobel filter, I am able to produce the outline effect successfully on a white background. See below:
However, when I make the film (the background) transparent, the outline disappears. Is there a way to keep the black outline of the fully transparent object on an a transparent background?
The same node setup, but with film set to transparent:
My thanks in advance for any assistance or pointers in the right direction.