Very much like this orange outline here, but I need this outer layer but purple and part of the actual model itself.
2 Answers
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If you need it part of the model, you can use the famous "solidify outline" technique (tutorial).
It works with Cycles too, as long as you use the following logic for the outline material :
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$\begingroup$ How does that work? Can you share your sources? $\endgroup$ Commented Mar 26, 2023 at 21:36
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$\begingroup$ Do you mean the "solidify outline" technique, or the light path trick pictured above ? Both work hand in hand, the former generates an inverted shell around the geometry and the latter allows the underlying mesh to render as if there was no shell around it. $\endgroup$ Commented Mar 27, 2023 at 23:23
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$\begingroup$ Primarily the “solidify outline”. It’s better if answers are self-contained or at least point to specific sources. $\endgroup$ Commented Mar 28, 2023 at 9:47
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$\begingroup$ I see, apologies I'm pretty new to stackexchange. I added a link to a video tutorial to my answer. $\endgroup$ Commented Mar 28, 2023 at 12:28