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+--- Thread: maximum particle amount for emitter (/showthread.php?tid=1103)
maximum particle amount for emitter - Bandu - 12-17-2010
Hallo,
I'm emitting smoke from particles and see that huge amount of particles slows down the simulation a lot and for the most time FFX is using only one CPU to calculate the voxels.
It takes very long as fume is showing me this message "Vmax=14,540, dtReg=0,32, steps=1, CFL`=15,54" an another more time to "Build voxels for 232655 particles"
Can somebody explain what this numbers means and why FFX is not multi threaded on this??
Thank You,
Bandu
Re: maximum particle amount for emitter - sitnisati - 12-17-2010
Hello,
Applying of sources cannot be multithreaded as they write to voxels in random ways (so to speak) and their operation overlap (reading/writing to the same voxel many times).
CFL' means used CFL number based on the velocity in grid and simulation steps.
Kresimir
Re: maximum particle amount for emitter - Bandu - 12-18-2010
oh... yes, I see...
but you could sort the particles before applying the forces so every voxel knows how many particles it keeps inside? (btw, every particle could have its own density/velocity ect. value driven by particle attribute - on the end this values get just averaged )
after sorting should be not a problem for multi threading
just a thought...
cheers,
Bandu
Re: maximum particle amount for emitter - sitnisati - 12-19-2010
Writing to voxels cannot be at the same time, which is what is performed for most of the time. I will check if there is a room for optimization.
Thanks
Kresimir