Some cool shader math stuff that makes blocks out of 0-1 values.
float x = data.texel.x;
int a = x * 3;
a = a % 3;
x = (float)a / 3;
float y = data.texel.y;
int b = y * 3;
b = b % 3;
y = (float)b / 3;
float xy = x + y;
float4 texelColor = float4(xy.xxx,1);
return texelColor;
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