koobas.hobune.stream
Custom shader or texture2d? (Best way to color swap)
Here's my little buddy. 
He likes white but not black. What's the best way to swap out the black for another color? Custom shader or texture2D?
Best Answer
Texture2D makes it very easy. I don't know anything about Mip Mapping so lets assume I have unchecked generate Mip Maps in my texture import settings.
// get all the pixels into an array of colors
Color[] originalColors = myTexture.GetPixels();
//find all the black ones and make them blue
for (int i = 0; i < originalColors.Length; i++)
{
if (originalColors[i] == Color.black)
{
originalColors[i] = Color.blue;
}
}
//set the colors of the texture to the new colors
myTexture.SetPixels(originalColors);
//very important
myTexture.Apply();
If you do have mip maps the functions mentioned above expect an integer index of the lowest map level I beleive. Something like that.
Ofcourse a well written custom shader will execute much more quickly.
Texture2D = Easier
Shader = Faster
Thanks!
