topic Re: Snow simulation is slow in Bifrost Forum

Snow simulation is slow

Anonymous — Tue, 31 Mar 2020 01:44:07 GMT

Hi!

Simulation is slow when the input face scale is in meters.
I adjusted by changing Detail Size of points_to_level_set and Multiplier of vary_source_property.
Is there any other way to speed up the process?

I attached my compound.
The input is a face, which is used as an emitter to simulate snow.
For example, The input is the roof of a house then create a snow mesh on it.
Physically, it is correct to make the roof a collider and let the snow fall from other emitters,
I'm doing this to speed up my work.

Thanks for your advice!

I want to expect simulation is quick like this picture in centimeters

Re: Snow simulation is slow

wuhailu — Tue, 31 Mar 2020 03:41:13 GMT

I heard that MPM will have GPU version in the future, which can improve the simulation speed.

Re: Snow simulation is slow

Anonymous — Tue, 31 Mar 2020 05:36:42 GMT

I'm glad to your reply!

Really? Is that information anywhere?

Re: Snow simulation is slow

Christoph_Schaedl — Tue, 31 Mar 2020 06:13:34 GMT

Its slow yes. It does get faster if you use faster hardware.

There isnt much to say. High quality simulation does take time.

Re: Snow simulation is slow

wuhailu — Tue, 31 Mar 2020 08:49:44 GMT

MPM was developed by the Jixie Effect team (http://www.jixiefx.com/) MPM algorithm has mentioned GPU http://www.cgchannel.com/2018/11/videos-see-siggraph-asia-2018s-best-technical-papers/

Re: Snow simulation is slow

Christoph_Schaedl — Tue, 31 Mar 2020 09:38:22 GMT

Yes but Bifrost is CPU only. For now.

And if somethign gets rendered on GPU doesnt mean its faster.

There are a lot of things out there that are slower on GPU.

A typical fx workstation does have 256GB of ram.

I dont see cheap GPUs in the near future with that amount of ram.

Re: Snow simulation is slow

Anonymous — Wed, 01 Apr 2020 01:55:17 GMT

Thank you for linking.
I was able to see that GPU was mentioned.
In hardware, there is nothing that can be done by users, so it seems that we will have to wait for a response.

Re: Snow simulation is slow

Anonymous — Wed, 01 Apr 2020 01:59:11 GMT

Thanks for your reply! I understand what you say.
I want to make it faster. In result, quality is reduced. OK
Do you have any ideas?

Re: Snow simulation is slow

Anonymous — Wed, 08 Apr 2020 01:29:38 GMT

OK, this topic is closed.

Thanks guys!

I will continue to use this forum.
See you on the next topic!