Help compositing Blender's shadow pass in Nuke?

Support Compositing and Post Processing
1

Hi guys! I’m using Nuke for compositing and am having a little trouble with the shadow pass. Is there any chance someone could help me out with the workflow between Blender and Nuke for this?

I rendered out a transparent shadow pass from blender as an .exr and wanted to place it on top of the diffuse pass. Although, when I imported the Blender shadow pass it had a few issues for me:

  • on any blend mode that shows the shadow pass it won’t show the diffuse through it even though it has transparency.
  • If you view just the pass you can see the transparency but when you merge it with another pass it is no longer transparent the bg of the shadow pass turns white.

For anyone who has composited Blender passes in Nuke, how did you add the shadow pass? Thanks for the help!

If anyone could make a video of how set up nodes, render, and composite the passes of a scene in Blender to Nuke it would be really helpful!

2

I’m not sure why you used a transparent shadow but you may have to set an alpha for it. It’s easy enough to do just by using one of it’s color channels if it’s not showing an alpha. I’m not sure how this acomplished in nuke because i have never used that program. Other than that shadows are typically applied using “Multiply”.