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I use Houdini to create the 3d scene and simulation and render with Mantra, which is part of Houdini too. But after rendering you always break down the rendered image and composite it back into the final image, while adding different trick to beautify the image. That is done in Nuke. Welcome to the list!

Did not know about Houdini, sure will check it out. Thanks for the info and the add! :-)