TurbulenceFD & TimeTrack?

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  03 March 2013
TurbulenceFD & TimeTrack?

Does anyone have experienced with using TurbulenceFD and TimeTrack?

I have an animation thats about 400 frames. Using a TimeTrack i slowed down the animation to about 700 frames (NOT linear time re-mapping)

I am using TurbulenceFD for some flames in the animation. But the TimeTrack does NOT seam to be slowing down the Flames, they play at full speed just longer amount of time.

I know that the other way to do this is to crank up the FPS then just play back at normal FPS. but in my test i need to crank up the FPS to around 300-400 per sec. in the slowest part. and I just cant afford to render that many extra frames to do the re-timing in AE. My test renders are coming in at about an hour a frame. So turning my 700 frame animation into a 4900 frame animation would blow my timeline AND my render budget.

any suggestions?
  03 March 2013
You have to use the Simulation/Timing settings in the Simulation Container. There you can set the TimeScale % (Below 100 for slow downs and above for speed ups) to match with your time Track adjustments.
  03 March 2013
THANK YOU!!! that did EXACTLY what i wanted. I just wish that there was a option to use a TimeTrack to drive this setting. This takes allot of trial and error to get it just right.
  03 March 2013
TurbulenceFD dies when Time Scale is animated


Thanks for your suggestion it will work BUT i keep crashing.

I animate the TurbulenceFD Time scale from 15% to 100% all the frames at 15% Simulate great. then 1 frame into the "ramp-up" TurbulenceFD just hangs.

Could you try this and see if its a bug or if something in my scene is screw.

  03 March 2013
Increase the substeps for the simulation.
  03 March 2013
Did increasing the substeps stop the crashes?
I did speedchanges in simulations from 100%-2% within 2 Frames without any problems. Artifacts and spikes in sim time usually occur when you speed up alot, but your sim runs within the 100%.

An update with many bugfixes was released yesterday - maybe this will help...
  03 March 2013
Substeps did not make a difforence. as soon as it got to the first frame of time change, it hung.

BUt the GOOD NEWS is that the update lastnight DID WORK!!! i already had my gridsize dialed down for testing. As soon as i re-simulated my scene with the new update it riped through the sim with no problmes.

tonight im going to to clear off my HD and setup a higher rez sim.

BTW is they any advantage to up-rezing a sim, or just redo a sim at higher resolutions?

Thanks for your help everyone.
  03 March 2013

Upresing keeps the overall shape of the sim, while resimulating might dramatically change whats going on - this can be good or bad, depending on what you need. For upresing the velocity cache is needed, which can get quite big.
  03 March 2013
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