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GI shadowcatching

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Carlos AngeliGI shadowcatching
by on Aug 31, 2012 at 1:13:40 pm

Hi guys,

I have simple scene set up. One object sitting on a plane. No lights, just an HDR sky and GI on. I'm trying to get the exact same result as using the Shadowcathcer plugin, which gives you a render of the object with it's shadow (transparent) and no floor.

However, it doesn't seem to work with GI, just plain ol'lights. Is there a work around this?


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Adam TrachtenbergRe: GI shadowcatching
by on Sep 1, 2012 at 4:33:04 pm

There's no easy solution, unfortunately, because there's no way for the program to distinguish GI shadows. One thing you can do, though, is use a separate render to create your own GI shadow multipass:

* place a floor object under your object, give it a white material, and add a compositing tag with "compositing background" checked;

* add a object buffer in the comp tag;

* add a background object and give it the same white material;

* render out the image and the object buffer;

* in post, use the object buffer to knock out the object, leaving just the GI shadow, and multiply that over the full the render.

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Carlos AngeliRe: GI shadowcatching
by on Sep 1, 2012 at 5:41:00 pm

Thanks Adam! I ended up doing that and it worked OK. I just thought that maybe there was some other work around that I didn't know about.

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