Just like other simulation engines, you will get unpredictable results if your scenes are microscopic or gigantic in scale. Since FumeFX is based on real-world computational fluid dynamics, something to consider is the scale of your scene. Note : Unless you're using "Boundless" grid options, no simulation will take place outside of this volume. When done, you'll get a yellow rectangular wireframe box like the one shown below. Once selected, like any other object inside of 3ds Max, simply drag out the new volume in any viewport. In order to create a FumeFX grid in your scene, simply go to the Create Command Panel and from the Geometry dropdown menu, select FumeFX -> FumeFX. Whatever size volume you define when you drag out the FumeFX grid will act as a set of boundaries for the simulation. You can think of the FumeFX grid as a 3-dimensional representation of a volume in which the simulation of smoke and fire will take place. This entire, quite sophisticated system is built around a very simple object called the FumeFX Grid. The heart of FumeFX resides within its simulation engine.
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