Normal encoding problems

lipsryme · 2012-09-12T15:28:37

I've been trying to correctly encode my view-space normals for a while now but it's just not working. I tried every algorithm in here (http://aras-p.info/t...rage.html#intro) but every time I get wrong normals. Well except the basic one. half4 encode (half3 n, float3 view) { return half4(n.xyz*0.5+0.5,0); } half3 decode (half4 enc, float3 view) { return enc.xyz*2-1; } This works perfectly but my specular keeps jumping around. I guess that would be a precision issue because of the 8bit target. Well so then I try the next easiest thing which is storing X&Y and reconstructing Z like this: half4 encode (half3 n, float3 view) { return half4(n.xy*0.5+0.5,0,0); } half3 decode (half2 enc, float3 view) { half3 n; n.xy = enc*2-1; n.z = sqrt(1-dot(n.xy, n.xy)); return n; } And it's error all over again. The lighting changes with my view direction. (where I look at) I tried this with both an R8G8B8A8 and R16G16 format but no change. How is it that every encoding method I try fails. Any idea what I'm fundamentally doing wrong ? Normals are calculated this way: float4x4 WorldView = mul(World, View); // Output view space normals output.Normal.xyz = mul(input.Normal, (float3x3)WorldView);

Graphics and GPU Programming Programming

Started by lipsryme September 11, 2012 05:37 PM

9 comments, last by kauna 11 years, 7 months ago

kauna

2,925

September 12, 2012 03:28 PM

The Ares page version is storing the value to a integer target so there is some math done to map the values between 0..1 and vice versa for the decoding step. I realized that it was unnecessary with a floating point target.

Cheers!

Normal encoding problems

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Normal encoding problems

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