I have a smoke emitter that is under a rocket (but not touching anything). It emits smoke, but the smoke just sits there in a bubble. It doesn't flow. If I move the emitter away from the collision objects, it works fine. It's like the smoke won't get within a meter of any collision object, and this is a threshold that I can't seem to edit. Any ideas?
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2 Answers
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One problem could be the Resolution of the smoke domain as smoke will not enter a 'cell' that overlaps the obstacle. This is illustrated by the following image :
This is using a Smoke Domain Resolution of 64 - meaning that the 'cell' size is 1/64th of the longest X,Y,Z dimension of the smoke domain.
As you can see, the influence of the obstacle is 'stepped', clearly showing the individual grid cells. For 'flat' non-rotated surfaces this can be seen as a considerable gap between smoke and obstacle.
Choosing a much larger Resolution will reduce the size of the cells and the resulting in smoke that can get much closer to the obstacle.
answered Sep 17, 2018 at 6:05
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Have you checked the boundaries of the Smoke Domain?
The Smoke Domain is a cube that determines the limits of the simulation of the smoke. It cannot escape it. The cube can be resized and it's shape changed, of course.
