### Reconstructing Position From Depth

Matt posted an excellent article about reconstructing position from depth. Check out his article here: http://mynameismjp.wordpress.com/2009/03/10/reconstructing-position-from-depth/
He has the following function to reconstruct

*View Space Position*from*Post Clip Space Position*: // Function for converting depth to view-space position // in deferred pixel shader pass. vTexCoord is a texture // coordinate for a full-screen quad, such that x=0 is the // left of the screen, and y=0 is the top of the screen. float3 VSPositionFromDepth(float2 vTexCoord) { // Get the depth value for this pixel float z = tex2D(DepthSampler, vTexCoord); // Get x/w and y/w from the viewport position float x = vTexCoord.x * 2 - 1; float y = (1 - vTexCoord.y) * 2 - 1; float4 vProjectedPos = float4(x, y, z, 1.0f); // Transform by the inverse projection matrix float4 vPositionVS = mul(vProjectedPos, g_matInvProjection); // Divide by w to get the view-space position r…