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

Overview

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This dialog is used to enable/disable the interaction with objects in the scene. There are several different types of objects that may affect the simulation: Sources, Solid objects, Forces, etc.

By default, all these scene elements will interact with the simulator unless otherwise specified by the the Include/Exclude list. If you want to disable the interaction, you have to put the objects in the the Exclude list. If there are more objects that don't need to interact with the simulator, you may alternatively switch to the the Include list mode mode. In this mode, you have will need to add to the list all the objects that you want to interact with the simulator.

Since all forces affect the simulation by default, adding a force in your scene to be used by e.g. PFlow will PFlow, for example, will also automatically affect your simulation and this might not be desireddesirable. In the Active Forces list, you can check which 3ds Max forces interact with the simulator, and you may exclude them forces if you wish soto.

Parameters

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Section
Column width 55% Expand – Opens a floating dialog that contains the selected rollout and automatically folds the command panel rollout. Re-Center – Resets the position of the floating rollout. ? – Opens up the help documents for the Fire/Smoke Interaction.

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Include/Exclude

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List | ielist_new iemode_new  – Determines which objects will be ignored or processed by the simulation. Use the radio buttons to switch

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between Include

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list and

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Exclude list.

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When Exclude list

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is active (the default), all objects in the scene will interact with the simulator unless they are added to the exclusion list.

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In Include list mode, no objects will interact with the simulator unless they are added to the list. Note that

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in Include

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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

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Hidden Objects | exclhidden

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_new – When enabled, the hidden objects will be excluded

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no matter if they are in the list or not. Add – Adds the selected object to the Scene Interaction list.  Add Many – Adds many objects to the Scene Interaction list allowing to quickly add a list of nodes. Remove – Removes the selected object from the Scene Interaction list. Anchor ObjectVoxels ObjectVoxels

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Geom Border Voxels | objvox  – The Fire/Smoke simulator is a grid-based simulator, and geometry is converted into voxel form in order to interact with the fluids. The voxels overlapped by Solid geometry 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. Even if this does not produce significant changes in the simulation, in rendering you might see a gap between the fire/smoke and obstacles

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in Circumscribed

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mode. On the other hand, very thin obstacles might be missed by the simulation if you

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use Inscribed

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mode, so it would be better to

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use Circumscribed

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for such geometries. You can also override the voxel mode per object from

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its right-click Phoenix FD properties. For more information, see

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the Object Voxels example

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below. Circumscribed  – All voxels that intersect the surface are considered solid.

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Center – The surface voxels are considered solid only if their bigger part lies in the object.

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medium

Inscribed – All voxels that have intersection with the surface are considered non-solid. UI Text Box
size	type note The Geom Border Voxels  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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Column width 5% Column width 40% Image Added

Anchor
ObjectVoxelsExample ObjectVoxelsExample

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Example:

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Geom Border Voxels

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