Why does setting InverseMass to zero on a single particle freeze all particles?

[pushmatrix]

This is the expected result for a fluid particle: density constraints try to keep constant mass per volume unit. Once a particle with infinite mass gets in the neighborhood of another particle, the only way to ensure no changes in density is to either set infinite velocity (due to the infinite pressure) or stop all relative movement (which is more reasonable behavior imho)

That makes sense! Thanks for the speedy reply

The effect I’m going for is like hardening lava. First it flows onto a surfaces, then it hardens and comes to a stop. Any other lava that pours over hardened lava just flows on top and around it (until it hardens itself)

any thoughts on how to achieve such an effect? Thanks!