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UI Path: ||Select PhoenixFDSim|| > Attribute Editor > Scene Interaction rollout


Parameters

 

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Interaction Set | interactionSet – Specifies a set that defines a list of objects to include/exclude from the simulation. All other objects in the scene are excluded/included respectively.

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Ignore Render Layers | interRenderLayer – When enabled, the render layers will be ignored during the simulation. Otherwise, the simulator will interact only with objects in the current layer.

 


Geometry

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ObjectVoxels
ObjectVoxels
Geom Border Voxels | objectVoxels – This option is valid only for Fire/Smoke simulations. 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 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 the Phoenix Object Properties extra attribute. For more information, see the Object Voxels example below.

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Use Viewport Subdivision | objectViewSubd – When enabled, the viewport subdivision will be used for simulation.

 


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ObjectVoxelsExample
ObjectVoxelsExample

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Example: Geom Border Voxels

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typeinfo

The example below shows the difference in emission when the object uses Inscribed (voxels intersecting the surface are non-solid therefore do not emit) vs Circumscribed (voxels intersecting the surface are solid) voxelization.

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Inscribed

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Image Modified
Circumscribed

 
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