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akaliln

pyro smoke issue

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hi I have a problem with smoke upres sim. it's normal when I cache lowres. but when I use upres to sim. the result is weird. the smoke has been cut into quarter after few frames.

don't know if anyone has the same experience. I tried to solve it with change my bounding parameter setting. but nothing going good.....

( maybe the problem not from bounding box, because the bounding range in normal in the viewport. not sure....)

the video and pics attached.  

 

 

 

issue_1.mov

未命名.png

未命名2.png

未命名3.png

Edited by akaliln

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Looks like a sdf cut, do you have any collision field in your set up by any chance? For smoke all you need is density and vel.

What's your initial lowres value and upres value ? - sometimes if you upres too much the voxel will be shattered and has artifact then looks all weird. 

And I know the upres technique is a way to approach for high quality volume, but, to be honest I try not to rely on it. I will just use standard smoke solver and tweak the division size instead of cache out lowres and use upres solver.

Hope this would help.

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On 2019/12/19 at 2:29 AM, jimeng20 said:

Looks like a sdf cut, do you have any collision field in your set up by any chance? For smoke all you need is density and vel.

What's your initial lowres value and upres value ? - sometimes if you upres too much the voxel will be shattered and has artifact then looks all weird. 

And I know the upres technique is a way to approach for high quality volume, but, to be honest I try not to rely on it. I will just use standard smoke solver and tweak the division size instead of cache out lowres and use upres solver.

Hope this would help.

you are right. it's works fine after I plug off collision fields. I agreed what you said about the upres. you will get very sharp shape by upres. 

anyway. I should find a way to solve the collision problem in upres. thx for your help.

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