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Question Arbitrary world to screen space?

Discussion in 'High Definition Render Pipeline' started by snacktime, Feb 4, 2021.

  1. snacktime

    snacktime

    Joined:
    Apr 15, 2013
    Posts:
    3,353
    Having a hard time with this one. I'm in a custom post process shader and want to get positionSS from an arbitrary positionWS. To use for sampling the input texture.
     
    snacktime, Feb 4, 2021
    #1

  2. snacktime

    snacktime

    Joined:
    Apr 15, 2013
    Posts:
    3,353
    This appears to be it, although I have some artifacts which might be due to this being wrong or world space outside of the screen not sure yet.

    Code (csharp):
    1.  
    2. uint2 ComputeScreenPosition(float3 positionWS) {
    3.         float2 positionNDC = ComputeNormalizedDeviceCoordinates(positionWS, UNITY_MATRIX_VP);
    4.         positionNDC /= _ScreenSize.zw;
    5.         return uint2(positionNDC.x, positionNDC.y);
    6.     }
    7.  
     
    snacktime, Feb 4, 2021
    #2