TwoSided lighting, not the best result with a sphere

Graphics and GPU Programming Programming

Started by Alundra April 12, 2017 02:22 AM

2 comments, last by Krypt0n 7 years ago

Alundra

2,325

Author

April 12, 2017 02:22 AM

Hi,
I use TwoSided lighting for window for example using this technique with culling disabled :


float4 ps_main( Interpolator i, bool bIsFrontFace : SV_IsFrontFace ) : COLOR0
{
   float3 normal = bIsFrontFace ? i.normal : -i.normal;
}

Works well for plane mesh but with a sphere you have a bad result so I was curious and experimented things.
Using two render switching the culling mode clockwise/counter-clockwise gives a better result for a sphere.
Is it possible to have a good result for a sphere using the one-draw-call method ?
Or maybe in case of a sphere it's needed to have another mode ?
Thanks

Krypt0n

4,769

April 13, 2017 10:58 AM

Hi,
I use TwoSided lighting for window for example using this technique with culling disabled :
float4 ps_main( Interpolator i, bool bIsFrontFace : SV_IsFrontFace ) : COLOR0
{
   float3 normal = bIsFrontFace ? i.normal : -i.normal;
}
Works well for plane mesh but with a sphere you have a bad result so I was curious and experimented things.

Are you 100% sure you have a problem with the shading? Isn't it maybe some transparency sorting?

"bad" is not a good explanation for a problem ;). Post maybe a screenshot of the issue.

video game porting and optimization service + consulting

Alundra

2,325

Author

April 13, 2017 01:46 PM

Good point, I didn't think of that but you are surely right there since I don't use any OIT actually and now you say that, it's coherent with the result I think.

Krypt0n

4,769

April 13, 2017 02:33 PM

if you disable depth testing and set the transparency to be additive, it should look consistent (not correct, but always consistent). that way you'd know it's just the transparency sorting.

video game porting and optimization service + consulting

TwoSided lighting, not the best result with a sphere

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TwoSided lighting, not the best result with a sphere

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