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Tonhiox

Using pressure or speed field as a mask in a pyro sim ?

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Hello guys ! 

It has been now 3 years I'm working in the VFX industry. I saw a lot of different FX artist/TD so far and I came to the point that there is many ways of doing a pyro sims as there is artist to make it...
From all those different artist,  I met people doing amazing simulation from really complicated pyro solver and other with a only a few nodes. 
 
There is one specific  topic I wanted to get thoughts from you guys was the using of the speed field from the length of the vel field versus the pressure field
People tends to use one or the other as a mask for turbulence, disturbance etc.. in their pyro. Both seems working farely well, but I would like to know more about the prons and cons of those technics ! 

Looking forward to read your thoughts ! 

Cheeers :) 

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