Dust and scratch
 

Hi,

I want to add dust on a texture but have no idea how to do this. I guess i have to use Stencil but i don't know how it works.

Can anyone help ? Thx

my shader network

why cant you paint dust straight onto the texture map?

Sure i can.

The goal is to have one texture which is mapped several times on each face of a cube, without having tons of image files because it is memory consuming.

So i plan to use one image file filtered by opacity masks.