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X and Y are inverted in UV coordinates?

Discussion in 'Shaders' started by DimitriX89, Feb 13, 2018.

  1. DimitriX89

    DimitriX89

    Joined:
    Jun 3, 2015
    Posts:
    550
    Hello! Recently I've wanted to create a time-based effect in the shader:
    Code (CSharp):
    1.             float2 ScrollX = (0.5,fmod(_Time.y,1));
    2.             fixed4 emissionGrd = tex2D (_EmissionGradient, ScrollX);
    (to advance the horizontal coordinate of the gradient texture over time). It works, but for some reason the Y axis counts as horizontal for UV. Is it normal? Sorry if it is a noob question
     
    DimitriX89, Feb 13, 2018
    #1

  2. bgolus

    bgolus

    Joined:
    Dec 7, 2012
    Posts:
    12,230
    That's not proper syntax for setting a float2... I'm not even entirely sure what that does.

    float2 ScrollX = float2(0.5, frac(_Time.y));
     
    bgolus, Feb 14, 2018
    #2

  3. DimitriX89

    DimitriX89

    Joined:
    Jun 3, 2015
    Posts:
    550
    Ok makes sense. I should've defined float 2 (though somehow it didnt prevent the shader from running) and I had no idea that frac function exists. Fmod indeed would not help here. Thanks!
     
    DimitriX89, Feb 26, 2018
    #3