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Severus240

Texture lookup problem

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Hi there,

I am adding random vectors to the world position. How do I transform these into coordinates that can be used in the Texture2D "Load" function to look up the samples depth from the depth shader resource?

I have transformed the new world sample positions by the view, projection matrices and then divided by w. This doesn't seem to have worked.

Thanks

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After division by W your XY coordinates will be of the range [-1, 1], where (-1, -1) is the bottom left of the screen and (1, 1) is the top right. Load takes integer coordinates of the range [0, NumTexels - 1] so you need to do some conversion. Basically you need to flip y, compress to [0, 1], then multiply by the size of the texture.

float4 screenPos = mul(samplePos, ViewProj);
screenPos.xy /= screenPos.w;
float2 texturePos = screenPos.xy * float2(0.5f, -0.5f) + 0.5f;
texturePos *= TextureSize;
float depth = DepthMap.Load(uint3(texturePos, 0));

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