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I really like to see "transparent shadow option" depending on object color and thickness (same as in vray) to be able to workaround caustics on dielectric problem In archvis it really doesn't matter if there are true caustics behind glass but when there is no colored shadow there is always problem with perceived absorption of the glass...

Here is what I mean:
https://www.youtube.com/watch?v=kj4yWM12LSg

You can use two geometries at the same time for the glass:

1.- With real glass material and hidden to GI
2.- With AGS material and hidden to camera and reflections/refractions

#1 will give the looks and #2 will give the shadow

There's one small glitch in this solution: the faces of both geometries cannot be coincident or it will give strange results; just move #2 a tad in every axis.

This works also with pool water (You'll get refraction of the bottom of the pool, good looks and fast render, but no underwater caustics)

I know, it's good solution but will not give colored shadows...