So I was creating a smoke sim (in 2.82) and had a cloth fall onto the smoke to act as an obstacle, so that it would collide with the smoke, however it did not. I have set the cloth to be an effector but it won't move the smoke what so ever. What setting is there to help with this?enter image description here

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    $\begingroup$ Have you tried checking Is Planar and turning up the surface thickness? $\endgroup$
    – 8176135
    Commented Feb 18, 2020 at 4:06
  • $\begingroup$ I did not do it before, it now works $\endgroup$
    – Karl
    Commented Feb 18, 2020 at 14:33

1 Answer 1


Since my comment worked, here it is as an actual answer:

When your collision object has no thickness, you either need to add thickness (e.g. by using solidify), or check the Is Planar box, and fake thickness with the Surface Thicknesss slider.

Checking Is Planar

A lower value will be more realistic, but risk smoke passing straight through, while higher values will more likely stop the smoke, but might look weird as the smoke will stop before reaching the geometry.


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