Paint the Alphachannel

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Thanks for all your advices. Unfortunately decals wont do it as it is actually not just about footsteps.
Im creating a snowball-war game where you run around, rolling balls on the ground, scraping up snow to make balls, gets hit and slide over ground...
All this will impact the snow underneath and as snow are removed/diminished it will become harder to make snowballs.

So at this stage of design we cannot hae any quads that will fade out :(

Now, I think I will try to paint the oerlay texture black (0,0,0) and set it to mask.
But still I face the same (?) problem. Can it be done copying just the footprint (not a rect) on the texture. I mean, first I want it rotated and then when two footsteps are joining each other I dont want the new one to oerlap the other with somme white square thingie.