in master class, the custom solver has different solving order to H12 smoke solver, but both solver keep “vel self advection” run before “project non-divergence” like jeff mention.

Does other solving order get coupled subsequently important ?? Like “vel advect field/geometry” runs before or after “project non-divergence”?? since “project non-divergence” removes all divergence component form vel field, and return a proper net-gain net-loss vel field. shouldn't “vel advect field/geometry” get update after “project non-divergence” like H12 solver?

and why “vel self advection” is not run after “external source” and “vel/force add in”?? How does it account those factor(external force) if “vel self advection” is not run after those 2 factor add in current vel.

Master class smoke solving order:
vel advect field/geometry
external source
vel/fource add in
– vel self advection
– project non-divergence


H12 smoke solving order: (small brace is the yellow null node inside smoke solver represents stage)
– vel self advection ( vel advect )
vel add in ( vel update )
– project non-divergence ( project )
vel advect field/geometry ( advect )
external source

sorry for my bad English .. , and thank you for your time