Just saw this Video! What do you think this means:
https://youtu.be/0Ephu8LB4rA
Is KeyShot supporting RTX?
Did Nvidia use KeyShot for promo Material?
???
There are many physical based ray tracer out on the market, so it could be anything that has implemented caustics.
Just try to recreate this scene in Maxwell, Corona, V-Ray and hit the render button. You'll be surprised how similar the results will be.