I'm developing my first 3d game "My Little Hitler" and I am texture painting my low poly model. As shown in the picture, I want to paint the skin color whithout removing the facial drawing black color... how do I accomplish that?
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In this particular case you can set the blend mode to multiply. Since
input_color * 1 = input_color and
input color * 0 = 0, painting on white (
1) will result in the exact color you are painting with, while painting on black (
0) will result in black.
But I'd recommend painting from the bottom up, using layers and transparency to minimize destructive editing.