Gasblur microsolver

[tamagochy]

When i use it for density field in pyro sim i always get squares at the low density parts of density field.

It possible to avoid this or add somthing to fix it?

[bunker]

maybe some volumecompress SOP in your setup?
you can check in a python shell:
for i in hou.nodeTypeCategories()["Sop"].nodeTypes()["volumecompress"].instances():print i

[tamagochy]

Yes i use volum compress. But when i disable gasblur all fine. Its only happen when gasblur enable...

[bunker]

A screenshot of the issue or a HIP file would help  

[tamagochy]

Just sim it and after 250 frames in less density area you will see it

gasblur.hipnc

[bunker]

of course, it's a volume compress node that create tiles, nothing weird there
check "/obj/smoke_column/volumecompress1/" and can set the "Constant Tile Tol" to zero
Also I would reduce the "Quatization Tol" to 0.001 so it's a bit less noisy
I muliplied the density display 10x so you can see the compression (frame 250)

Edited November 29, 2016 by bunker

[tamagochy]

But why it happen only when i use gasblur? Without it no tiles on the smoke. Volume compress depend from fields?

[bunker]

That's the result of diffusion (what the gas blur does) you'll get more areas of low density over time.
Check out the HIP file attached.

 

blur_and_compress.hip

Edited November 29, 2016 by bunker