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Question by Ben Throop · Feb 17, 2010 at 06:34 PM · shadowshadowmap

How do I exclude objects from shadow casting across layers?

I'm making a spaceship combat game where the player (and camera) is in the cockpit of their ship. The cockpit needs to be self shadowing, but I don't want other ships that fly by to cast shadows onto it because it makes the shadowmap too large, which creates visual artifacts. However, I also want the external spaceships to self-shadow.

Can I exclude the external ships from casting shadows upon the cockpit while still having them be self shadowed? I have them on separate layers with one directional light for each, but they are getting mixed into each other's shadow map extents. Can this be fixed?

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Answer by andeeee · Feb 19, 2010 at 01:24 PM

Are you using the culling mask for the light, or is this not doing what you want?

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avatar image Ben Throop · Feb 20, 2010 at 01:53 PM 0
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Well, you inspired me to look at the docs on culling masks, and even though I was using layers and lights for this situation, it looks like what I need to do is have two cameras. The first renders the cockpit alone, not the external ships. The second renders everything else. I'm 99% sure this will enable me to cast exactly the shadows I want on the cockpit. I upvoted your answer for motivating me to read the docs more closely. :)

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