Yeah, Blur's rain material is good, but I was thinking more along the lines of the small splashes that happen on impact when rain hits a wet surface, and water is bounced back upwards momentarily. ParticleFlow in Max makes such an effect rather simple to do by "spawning" particles into smaller ones when they impact a deflector (or in this case the ground). Add some gravity and Blur's material, and you have some damn realistic animated rain effects. Something like that would be quite difficult (if not completely impossible) to duplicate believably in Bryce I'm affraid. :-(

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.