Posterize - 图1

    1. /*
    2.  * Posterise.osl by Charlie (c)2012
    3.  * from https://github.com/sambler/osl-shaders
    4.  *
    5.  * license: public domain
    6.  *
    7.  * original script from -
    8.  * http://blenderartists.org/forum/showthread.php?270332-OSL-Goodness/page5
    9.  * Modified 1/4/2020 by Saul Espinosa for Redshift 3D
    10.  */
    13. shader posterise
    14. [[  string help = "Posterize Filter Effect",
    15.     string label = "Posterize" ]]
    16. (
    17.     int Range = 8
    18.     [[
    19.     int min = 0, int max = 50
    20.     ]],
    21.     color Color = 1
    22.     [[
    23.     string label = "Input"
    24.     ]],
    26.     output color Output = 0 )
    27. {
    29.     float posterise(float Value){
    30.         if( Range > 1 ) {
    31.         return floor(Value * Range) / (Range-1);
    32.     }
    33.     else if(Range == 1) {
    34.          return 0;
    35.     }
    36.     else  {
    37.         return Value;
    38.         }
    40.     }
    42.     Output[0] = posterise(Color[0]);
    43.     Output[1] = posterise(Color[1]);
    44.     Output[2] = posterise(Color[2]);
    47. }