Use Background shader problems

# 1 15-09-2011 , 11:00 PM

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Join Date: Sep 2011

Posts: 55

I am using use background shader with specular color : Black, Relectivity : 0, Refl Lim :0, Shadow mask : 1.

One key light is included in the scene with shadows turned on.

I am getting ridiculous shadows ( see attachment ) with Use BG shader, but perfect soft shadows with normal render ( see attachment ). Using point light with raytraced shadows.

Using maya software rendering.

Help is appreciated. Thanks

user added image

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# 2 16-09-2011 , 07:24 AM

The Nurb Herd
Join Date: Oct 2007

Location: London

Posts: 2,381

why are you using use background shader?

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# 3 16-09-2011 , 07:52 AM

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I need to extract the shadows out. I know it can be done by using the native shadow pass in maya, but still am keen to solve this issue, as this is happening in only some of the shots in the entire sequence ( with same settings ).

maybe i'm having a bad day .......

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# 4 16-09-2011 , 08:58 AM

The Nurb Herd
Join Date: Oct 2007

Location: London

Posts: 2,381

not sure what i'm looking at but the shadows look like they are working fine to me.

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# 5 16-09-2011 , 09:37 AM

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the shadows on the character are weird only, BG is coming fine !!

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# 6 16-09-2011 , 10:01 AM

The Nurb Herd
Join Date: Oct 2007

Location: London

Posts: 2,381

isn't it just self shadowing?
why do you want to separate the shadows anyway? If you are going to comp it then you would probably want to separate the character from the bg.

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# 7 16-09-2011 , 11:56 AM

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It is indeed self shadowing, and i will be separating both, but when we use USE BG Shader, it does not gives self shadow, it only gives cast shadows.

Here i have both. Tried to even switch off receive shadows for the char mesh, but then it is a problem when the character picks up any object and its shadow fall on the char mesh.

I M STUCK...

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# 8 21-09-2011 , 10:26 PM

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Join Date: Sep 2011

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well i did not find a solution to this .
I had to resort to the "Raw Shadow Pass" to get the shadows out. Even the " Shadow Pass" was taking out shadows onto the diffuse colour of the mesh.

user added image

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# 9 13-10-2012 , 08:36 PM

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Join Date: Oct 2012

Posts: 1

Use background doesn't show shadows

Hey, i've got a problem:
I put the use background shader on a plane under an object. Abovethe object is an ambient light.
When i render it, everything's fine, but there are no shadows...
What shall i do? user added image