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It seems like blender does not have a feature to render light path expressions like these in RenderMan.

There's a thread on devtalk about this but I havent seen any further updates.

Essentially, I want to render the LPEs found in the Stylit paper (see figure 4).

Here's a screenshot of it : https://imgur.com/a/9K3lsL1.

They are:

  1. full global illumination render

  2. direct diffuse render

  3. direct specular render

  4. first two diffuse bounces

  5. and diffuse inter-reflections.

The first is straightforward but trying to generate the others using blender's cycle renderer is not trivial. I've managed to generate 2 and 3 (here: https://i.imgur.com/2BItEsz.png) but I can't seem to render no. 5.

Is there a better way to go about this in blender? Or are there open source libraries that are probably more fitted for this?

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