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pyro explosion sim question

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I've looked @ couple references, and explosions start from nothing (i.e. no smoke, fire) and in one frame there is a big fireball, smoke, and debris/projectiles (plz see attache ref images). 

My question: how in one frame it's possible to have all these elements (organic smoke and debris)? 

I have some ideas:

a- for pyro sim --> add preproll velocity to pyro sim - not sure if will get organic smoke shapes? sub-stepping is a bad idea in my opinion, it will slow sims lot?

b- for projectiles/debris --> can trail their motion, emit from the trail, but the evolution of the smoke might not look right

Tx for any suggestions :)




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