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 Post subject: Faking the GI
PostPosted: Wed Mar 03, 2010 5:31 pm 
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Beta Tester
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Hi all,

Here is a little trick to fake GI, it consist of using and light(you must place the light at the exact same place that the camera is) and uncheck specular on the light and exclude the mesh of the sclap on both lighting and shadow, put that light at little multiplier. IT's not 100 % like true gi, but does a good fake.

So here is the result.


Attachments:
torus_faked_gi_montage.jpg
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 Post subject: Re: Faking the GI
PostPosted: Wed Mar 03, 2010 5:53 pm 
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The problem with hair and GI is that hair does not *block* GI. However, it receives GI illumination. As a result hair gets illuminated a little too much especially at the roots. You can easily fake this effect for short hair by using a gradient map for making hair roots darker.

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Cem Yuksel - Developer
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 Post subject: Re: Faking the GI
PostPosted: Wed Mar 03, 2010 5:59 pm 
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ho yeah great tips Cem thank, I will try it.

For now, I did a test with shadow in pass, I get a pass of the shadow with not gi (this one is at 100% in the layer of photoshop) and an other pass of the shadow pass but this time with Gi faked, and I put this one on top of the other layer in photoshop at intensiti of 50% and on top of it, the hair with the faked GI on it, I get a great result.

At the right it's without the trick just the faked gi, a direct output and at the left with the trick I explaiend.


Attachments:
torus_faked_gi_montage2.jpg
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 Post subject: Re: Faking the GI
PostPosted: Thu Mar 04, 2010 6:53 am 
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Nice technique, thanks for sharing.

Kind Regards,

Joe

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Joseph R Saltzman
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3DTutorial.com
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