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n-sim, velocity propagation issue
#1
Hi everyone,

N-sim is a very cool feature and it's got great potential. I'd really like to utilize it however am having an issue where I'm getting a lot of what I'll call back-velocity affecting adjacent sim boxes.

See attached file with 3 sim boxes. Lower box has a simple source adding smoke and temperature, middle box is advecting sideways, plus a 3rd box included (though doesn't really matter for the sake of the test). After velocities and density rise into 2nd box, eventually around frame 130's the lower box velocities get violently pushed to the point where density is snuffed out near the simple source.

[ATTACHMENT NOT FOUND]

I've tried different configurations and all produce the same results.

Another test is to create a single box with a localized 'betterwind' near the top and simple source emission at the bottom. The wind affects upper region as expected. Now create it as an n-sim with a lower and upper box. After simming, eventually the upper box's velocities bleed into the lower and heavily affect the lower box.

Appreciate any thoughts. Thanks again!
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#2
Hi Brian,

That +Z blocking side could cause problems in the overlapping section with the upper box. I hope that helps.

Kresimir
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#3
Hi Kresimir,

Thanks for the response and for taking a look.

If the +Z is set to None, the result is the same as I describe.

If this was built out of 1 sim box with deflecting objects and effectors 'adding' velocity to do the sideways motion, the result does not snuff out the source. Am really anxious to put n-sim to use, however can't yet due to this velocity behavior.

Thx again,
Brian
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#4
Hello,

I have also removed cubis interpolation and it seems to be working fine - please check the included file and let me know.

Thank you.

Kresimir
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#5
Hi Kresimir,

Yep, that worked great. I'm such a cubic user, didnt think of that one. Might a fix for that possibly make it in the next release? I'm always running high detail sims and usually can't get away with having cubic off.

Thx again!
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#6
Hi Brian,

I have put this on a bug list and I hope we can solve it.
Cannot promise that it will be done for 3.1, but will look into it.

Thank you.

Kresimir
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#7
Hi Kresimir,

Awesome - thanks so much.

Best,
Brian
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#8
You're more than welcome.

Kresimir
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