I recently found out about Blender Render's Freestyle option to add stylized lines on a rendered model. It's really neat to see, but I was wondering if it's possible for these lines to affect PNG images (with transparent backgrounds).

For example, if I had an image of a sphere with a transparent background would a line follow the outer line of the PNG sphere and not the mesh the image was applied to?

  • $\begingroup$ As far as I know freestyle is a geometry based stroke rendering engine, that means it will only take actual blender mesh geometry into account, transparency and alpha maps are not supported as far as I know. Even face to face intersections don't generate any strokes if there is no explicit edge there. $\endgroup$ Feb 19, 2017 at 16:59
  • $\begingroup$ Ah, that's a shame. No matter I suppose; I can do that sort of thing in GIMP instead. $\endgroup$ Feb 19, 2017 at 17:40


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