Curious Case of Infinite Shadows in Karma

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Hello.

There is a group of prims that I want to mark as shadowcatchers.

A caster is flying over those and, over the course of the shot, different objects are receiving the shadow.

Here is the issue:
if I don't mark those prims "-shadow" they are casting shadow on themselves.
If I do, the shadow from the caster appears on all catcher objects no matter whether or not they behind some o t h e r objects.

Like shooting at multiple layers of plywood panel. I would expect the bullet to stop at the first, but no, the bullet flies through all of them. (The bullet is the shadow)

I cannot explicitly remove some objects from receiving shadows since I don't know which ahead of time.

Can this be sorted with LPE?
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If matte is set to background, they will not cast shadow on other matte objects, only recive.

Hope it helps.
Edited by Heileif - June 17, 2025 22:59:50
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