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This page provides information on the Interaction rollout for a FireSmokeSim objectFire/Smoke Simulator.

Overview

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It is strongly recommended to avoid geometry that has cavities inside. These may cause jets and other undesired phenomena.

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Include/Exclude list | ielist, iemode  – Determines which objects will be ignored or processed by the simulation. Use the radio buttons to switch between Include list and Exclude list. When Exclude list is active (the default), all objects in the scene will interact with the simulator unless they are added to the exclusion list. In Include list mode, no objects will interact with the simulator unless they are added to the list. . Note that in Include list mode, in order for a Source to work in a simulation, you must add the Source and also all of the geometries or particles it emits from.

Exclude hidden objects | exclhidden  – When enabled, the hidden objects will be excluded regardless of the list content

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ObjectVoxels
ObjectVoxels
Object voxels | objvox  – Phoenix FD – The Fire/Smoke simulator is a grid-based simulator, and geometry is converted into voxel form in order to interact with the fluids. The cells voxels overlapped by a solid Solid geometry object obstacles are frozen and processed in a different way. When a given voxel is half-way inside the geometry, this option helps you choose whether this voxel is going to be frozen or not. It Even if this does not produce significant change changes in the simulation, but is of crucial importance for the rendering. For example, if the object voxels are circumscribed, the liquids can't reach the real objects surface and this is visible in the rendering. You can override this option in rendering you might see a gap between the fire/smoke and obstacles in Circumscribed mode. On the other hand, very thin obstacles might be missed by the simulation if you use Inscribed mode, so it would be better to use Circumscribed for such geometries. You can also override the voxel mode per object from its right-click Phoenix FD properties. For more information, see the Object Voxels example below.

Circumscribed  – All voxels that intersect the surface are considered solid. It's recommended for fire simulations.
Center – The surface voxels are considered solid only if their bigger part lies in the object.
Inscribed – All voxels that have intersection with the surface are considered non-solid. It's recommended for liquid simulations.

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The Object voxels setting is a simulation option. If its value changes, the simulation must be calculated again for the changes to take effect.

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