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Create decals for water-trail

How do I create a decal for water-trails like those in the tech-demo (a sphere rolls over the floor and leaves behind a trail of water)?

I already saw this youtube video (https://www.youtube.com/watch?v=HSqlEjHVwYg) and implemented some of it.

But I am now stuck with how to limit the opacity so that multiple overlaying decals dont add up.

alt text

Additionally I would like to remove (or soften) the normals of the underlying material, how could I do that?

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asked May 30 '14 at 04:13 PM in Rendering

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