General

Specifies if the object emits at all and whether the object's children emit.

If Fill Object is not checked, the emitter will affect voxels in a region around the surface of the tagged object(s). If the radius is smaller than the voxel size of the fluid container, aliasing artefacts may occur. This can result in the emission to have gaps or disappear entirely.

TurbulenceFD does not anti-alias the emission in order to make the simulation and shading results more robust against changes of the voxel size.

If checked, the object will act as an obstacle to the flow. The fluid will have to flow around it. A moving collision object pushes the fluid around.

There is a special requirement for the geometry to work as an obstacle. To sample the object geometry on the voxel grid, the simulation has to determine whether a voxel is inside the object and or outside of it. A simple plane does not work for that reason - it doesn't have an "inside". Instead, you would have to create a wall using a scaled box. All parts of the object have to be large enough to cover at least one voxel. Structures thinner than the voxel size will not be resolved properly on the voxel grid.

If checked, the tagged object(s) will be filled with the values specified in this tag. Else, the values will be set only in a region around the surface of the object(s).

There is a special requirement for the geometry to work as a filled emitter. To sample the object geometry on the voxel grid, the simulation has to determine whether a voxel is inside the object and or outside of it. A simple plane does not work for that reason - it doesn't have an "inside". Instead, you would have to create a wall using a scaled box. All parts of the object have to be large enough to cover at least one voxel. Structures thinner than the voxel size will not be resolved properly on the voxel grid.

When using particles as emitters, you can modulate the emission intensity by any of the particle properties like Age, Mass, etc.

Adds noise to the particle property before mapping it to an emission intensity using the f-curve below. Some properties may be initialized too uniformly across all particles. You can use this parameter to break up the uniformity.

The f-curve allows you to customize the emission intensity based on the value of the particle property chosen from the drop-down box above.