Good work!
Is this already using 32bit fp textures or are you using a normal 8bit depthmap?
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i don't know much about the different filtering methods and so on so it will take me a while to figure this out.
I think i read somewhere that using anisotropic filtering in the depthmap samplers already gives a good visual boost. However this is a performance killer if i remember correctly. I'll have a look at my shaderbooks again...i think it was written somewhere in shader x5.
