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  • $\begingroup$ Thanx alot! This at least gives me a path forward. I was hoping to be able to do this with some linear algebra/projections or similar to take advantage over the inbuilt python support in Blender. But without knowing the internals, its a steep curve to learn how and what primitives to use to be able to calculate it in some efficient manner. After all, rendering the scene multiple times is heavy. $\endgroup$ Commented Jun 1, 2017 at 12:39
  • $\begingroup$ Rendering this isn't heavy at all. This render pass is very cheap, and you don't need any other passes for this calculation. $\endgroup$ Commented Jun 1, 2017 at 15:16
  • $\begingroup$ BTW, please accept this answer as the answer. It'll mark your question as answered and give me some reputation points. $\endgroup$ Commented Jun 5, 2017 at 9:53
  • $\begingroup$ Hello. I'll try the method and see how far I get. $\endgroup$ Commented Jun 20, 2017 at 12:43
  • $\begingroup$ I'm not able to produce a render with "Index Pass = 123". It turns out to be all grey all the time. Any hint on what I might be doing wrong? $\endgroup$ Commented Jun 20, 2017 at 13:26