Now you can play with it a bit.
You can play with the strength of the effect, use different variations of the map and many other.
You may decide not to use the foggy map in refraction glossiness slot at all
You can use the map with droplets that bounced from the window ledge and mix the effect with other ones or use it exclusively.
Or you can use a VrayBlend material to mix water material with glass (glass as base mat + water as overlay). This way you can get a more realistic effect if you use proper IORs – 1,33 for water and 1,52 for glass. I’d put the bump/normal map in both though.
Or you can use the foggy map in VrayExtTex and mix it in post. It’s more of a ‘fake’ approach, but may also look nice.
Or you can add another foggy map (no droplets) onto the inner glazing of the window.
Again – you can play with the effects and different maps and workflows all you want.
Also maybe check out Chaos Cosmos here: https://www.chaosgroup.com/cosmos
and here: https://www.youtube.com/watch?v=SIL_FGFr3DQ
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