raindrops on glas problem

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i wasn't able to figured out how to arrive this effect on my glas setup ( image attaced below)


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glas / air / glas / wet

any suggestion

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here my scene > it works fine now but it is way to dark - but every values are fine?!

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found a solution.

i unwrapped the texture and used the bump / refra.gloss map channel as uv coord not as seperat shader