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Compute depth 01

Discussion in 'Shaders' started by kokichi88, Sep 24, 2015.

  1. kokichi88

    kokichi88

    Joined:
    Mar 3, 2014
    Posts:
    13
    Hi guys, I don't understand how unity calculate depth 01. Formula is described in CgInclude is :
    Code (CSharp):
    1. #define COMPUTE_DEPTH_01 -(mul( UNITY_MATRIX_MV, v.vertex ).z * _ProjectionParams.w)
    Why not is
    Code (csharp):
    1. #define COMPUTE_DEPTH_01 (mul( UNITY_MATRIX_MV, v.vertex ).z * _ProjectionParams.w)
    without subtract.
     
    kokichi88, Sep 24, 2015
    #1

  2. Dolkar

    Dolkar

    Joined:
    Jun 8, 2013
    Posts:
    576
    Probably because by, I believe, OpenGL convention, the z component for view space positions in front of the camera are negative... So the minus sign should actually bring them back to positive values.
     
    Dolkar, Sep 25, 2015
    #2

  3. kokichi88

    kokichi88

    Joined:
    Mar 3, 2014
    Posts:
    13
    I got it, thanks you
     
    kokichi88, Sep 28, 2015
    #3