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I'm familiar with all the volumetric methods of creating cloud looking things. I'm familiar with particles from emitters.

What I really need is a cloud of smoke that moves like real smoke when an object moves through it.

I was thinking it could be done with particles emitted using zero gravity, then set a collision on them and move them when hit by an object, but I'm not sure how to set that up.

This is a very quick two second scene requirement, so I can use millions of particles if necessary.

The end effect would be like a person walking through a cloud and disturbing each particle of smoke.

enter image description here

Thank you for your thoughts.

Dr Tyrell
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  • Why don't use smoke sim directly? If you really need particles, you can use smoke sim as force field for particle system. One thing that I'm not sure about in Blender, if there was some progress in collision, because when I tried wind tunnel last time, there wasn't any vorticity behind the collider. – vklidu Jun 15 '23 at 07:10
  • The problem is that Blender emulates smoke using a volume shape. It doesn't actually have individual particles that collide with an obstacle. To my knowledge. – Dr Tyrell Jun 16 '23 at 03:42
  • @DrTyrell: This isn't totally true - but in parts. The smoke itself does not react to collision (unfortunately) but if you are using particle created smoke and collision objects, of course the so created smoke does "kind of" react with the collision, but only as the particles do. So later on, if e.g. the smoke would be moved by wind/gravity - it would go through the collision objects [1]: https://i.stack.imgur.com/XiljB.png – Chris Jun 16 '23 at 04:40
  • I was thinking I could create a volume that distorts in shape to simulate the collision. – Dr Tyrell Jun 16 '23 at 04:44
  • i am also not very experienced with smoke, but i would force fields parented to your object give a try. This might help and give that illusion. – Chris Jun 16 '23 at 04:47
  • Here is what I meant by Smoke as force field for particles and here what is wrong with turbulence seen in the first anim. ... – vklidu Jun 16 '23 at 06:51

1 Answers1

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We should probably ask - What did you try and where did you fail ... :)

Smoke Simulation

Like in my comment simple smoke sim seems to handle your needs ...

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Vector visualisation ...

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Here is a slice on Y axis where you can see what I mean by -no backflip turbulences ... smoke reacts on collider movement but not exactly as in a real world ... part of vorticity is missing ... but like I mentioned for your purpose it could work ...

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... or you can add another Force Field parented to Collider (mentioned by Chris if I understood it right :) )

So I have to ask again - What is the specific reason you need particles. Probably add some more screens or mockups to express better what didn't wok for you and what specific effect do you expect. Thank you

Smoke Simulation used for Force Field > Fluid Flow

Here is example with Particle system driven by Fluid Flow Force Field issuing smoke sim ...

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vklidu
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