As the artist shared, combining the MPM solver with Gas Temperature Update in Houdini 20.5 to create a unique clumping and rigid lava flow can be computationally intensive, but leads to impressive results.
This project is entirely point-based with no meshing or UVs involved, with 2.2 million points simulated over 2000 frames, taking about 20 hours. The final output was rendered using Arnold for Houdini.
Matthieu Pujol has previously unveiled this underwater explosion, complete with a tutorial, an icebreaker simulation, and other stunning works:
