SurfaceOutput.viewDir not the same in deferred

Question

I have a surface shader that I'm trying to get Fresnel working on and I'm getting strange results in Deferred rendering rather than Forward (forward looks correct). Seems to be related to the value of viewDir.

Here's the code I'm using for the Fresnel effect;

 half fresnel = pow(1.0f - saturate(dot(IN.viewDir, N)), _Fresnel);

I see the same result in Skyshop's materials as well.

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Anyone know how to get around this?

Answer 1

Answer by jvo3dc · Nov 28, 2013 at 11:04 AM

I noticed the same issue. It seems viewDir is not set correctly during deferred rendering.

My current simple workaround is to replace "IN.viewDir" with "(_WorldSpaceCameraPos - IN.worldPos)".

Of course you do have to make sure that worldPos is specified in your input structure.

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jrdmellow · Dec 08, 2013 at 09:38 PM 0

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Yes, I've tried that, but appears to be just as unreliable. Perhaps the root problem is something to do with one of those parameters.

SurfaceOutput.viewDir not the same in deferred

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