RF also has specialized solvers for Viscous, Viscoelstic, and Granular sims which I find superior to doing those things in XP. XP just requires a lot more fiddling around, both in the simulation and in the OVDB mesher, to get realistic results. I also find it much easier to set up a realistic sim in RF than in XP. With fluid sims, speed = quality as you’re going to get more tests done and more opportunities to make changes along the way. It has GPU support which XP doesn’t (yet), but even running on the CPU it is simply much faster.
First, the performance of RF in production quality sims is far better than XP. That said, there are still a few distinct advantages to Realflow. I also agree that their customer support and frequency of updates is superb. Overall, X-Particles is a better value as you get a much larger toolset that goes way beyond just fluid simulation. Their user forums are totally dead, and I’m always wondering of they’ve already EOL’d the product and just haven’t announced it yet. As mentioned above, the biggest drawback to Realflow C4D is the utter lack of communication and support from NextLimit.
I have both Realflow C4D and X-Particles, and have done a massive amount of testing of both products.
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