textures - How to wipe dirt away from glass? Unity3D -

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i need wipe away dirt pane of glass. thinking change texture @ area wiped, or dirt separate object gets destroyed reveal clean glass, can't figure out how either of without changing entire pane of glass @ once.

look writing shader takes takes clean texture, dirty texture, , third texture lerp between clean , dirty texture.

you need draw third texture on cpu using texture2d.setpixel() & texture2d.getpixel() , make pixels around finger darker based on distance.


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