The Domain Tag

This tag is used in conjunction with a FLIP (xpDomain) object. It allows you to use an object as a source of fire rather than an emitter. To use it, add the tag to the object you wish to use as a source. Note that the object must be located inside an xpDomain object for the tag to have any effect. The tag then sets the voxel properties from the object.


This is the tag's interface when attached to an object other than an Emitter:

When attached to an Emitter, the interface changes to look like this:

For the buttons at the bottom of the interface, please see the 'Common interface elements' page.


Object values

Use as Source

Check this switch to use the object as a source for a domain. If it is not checked the object will not be used as a source by the domain.


This selects whether the volume or surface of the geometry object should be used for setting the domain voxel properties.

The drop-down has three options:


The surface of the object is used.

Surface (Outwards)

The surface of the object is used and the values are set in the direction of the surface normal.


The object's volume is used.


This is the distance from the object (either surface or volume) over which to set the voxel properties. If 'Shape' is set to 'Volume' the properties are set within the full volume and faded over the Radius distance from the geometry.

Temperature, Smoke, Fire, Fuel and Pressure

These are the values to set for the respective properties of the voxels in the domain.


Here you can add a shader (e.g. a Noise shader) to modify the value of the properties set into the voxels.


You can drag a UVW tag or Texture tag into this field. This enables the texture/shader in the 'Texture' field to be used over a surface to set the values over the geometry. Note that this field is not available if 'Shape' is set to 'Volume'.


Drag a selection tag or vertex map tag into this field to restrict where over the surface the values are set. If a vertex map is used the values are weighted much like using the texture.

Emitter values

These values are used when the tag is attached to an Emitter. In this case, the controls govern how the particles from the emitter are linked to the domain.

Domain Velocity

The weight of the particles' velocity which affects the velocity field of the domain (voxels).

Advection Velocity

The weight of changing the particles' velocity from the domains advected velocity, so at 0% the particles will not be changed, at 100% they will be under complete control of the domain.

Domain Properties

The weight of the particles physical properties (smoke, fire, etc.) that is used to blend into the domain voxels (as with the velocity above).

Advection Properties

The mix of domain voxels back into the particles properties, so at 0% the particles' physical properties (e.g. smoke) will be unchanged.