Hello

Maybe I don't understand something, or maybe doing something wrong.
But it seems to me that Houdini fluids are much slower than Maya fluids.

Fluid Container 30x30x30 with a smoke emitting from a simple sphere in Maya simulates in realtime 25fps, but in Houdini exactly the same Fluid container simulates 4-5 times longer.

Maybe someone can explain me why it is so, or what I am doing wrong.

I am a fan of Houdini, but this low speed became a big problem for me when I needed to create a realistic look fire with smoke.

I've just made another test.
Default Smoke Fluids Container (divisions 30x30x30) with a sphere as a source in it.

It takes 6 seconds to simulate 100 frames in Maya 2008.

And exactly the same scene in Houdini takes 40 seconds to simulate 100 frames.

So sad that I want to cry !!!!!

… and please stop cross posting. Most people here visit odforce.net and vice-versa

Sorry

Could it be that in Maya it's a particle simulation, while what you're doing in Houdini is a voxel fluid?

from what ive seen houdini is not very good when it comes to speed on simulation, cloth (syflex and ncloth is alot faster), fluid (maya's one is faster), fluid particle (realflow's is so much faster), even rigid body dynamics i can find lots of other apps thats can calculate faster. the other day i tried to simulate sumthing that in realflow u could have done it with ease, in houdini it just run out of memory…
but i found that in houdini theres so much that u can do, that in other package… u just either cant or takes alot of scripting or coding your own plugins.
so i think choose wisely which 1 to use for your project

I could really use a simple cloth simulation for this animation of a flower opening. I have everything animated in houdini and tried to run it through the cloth simulation… and it was virtually unusable. there's maybe only 2000 polygons in the whole thing… and it can barely move from frame 1 to 2.

so basically I'm using ncloth in maya to do some simulation on it and will bring it back to houdini to put on the final touches. (actually I'm not normally a maya user, I'm just using it for the ncloth solver at the moment)

its too bad that it's so hard to stay in Houdini just because of the speed of the simulation…

Hi,

There were some improvements to the cloth solver in more recent builds. Not sure what build you're using so you might want to try again with the latest build.

Some threads regarding the performance of the cloth solver:
http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=13116 [sidefx.com]
http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=13297 [sidefx.com]

Cheers!
steven

Using 9.5.241 at the moment… I checked the more recent builds in the change log and didn't see anything right off hand that indicated that cloth was optimized since then

The ncloth engine is quite good but I'm really not having fun with the workflow in maya… but I can sim this particular project with self collision on in about 2 frames per second… but in Houdini it's really slow.

I believe 9.5.241 has the enhancements. I highly recommend you send an example to SESI so they can look at what you're trying to do & offer you some performance tips or improve the cloth solver further.

In any case, I would like to see the effect when you're done with it.

Cheers!
steven