This tag must be added to any object intended to be used as a source for an ExplosiaFX solver.

It controls the initial parameters for the burn model.

You can attach this tag to a variety of objects.

The source object can be:

• a polygon object or a primitive object which, when made editable, would be a polygon object.
• a spline, either a primitive or editable; the spline vertices are the source, so you may need to add more vertices for a uniform appearance along the spline.
• an xpEmitter.

You cannot use a MoGraph cloner directly as a source object.

Instead, make the cloner a child of an X-Particles Join object and add the source tag to that.

All the clones will then be used as a source.

If you use an xpEmitter, there are certain other things you must do:

• in the emitter's Extended Data tab, increase the initial Temperature setting from zero (in the Physical Data tab), essential to ignite the fuel; it is recommended that you try a value of 1 in the first instance.
• in the same tab, give the particles some fuel; a value of 1 may be enough; if you add too much the fire will never go out.
• adjust the particle radius to suit the effect you want; start with the same as the voxel size in the solver and increase or decrease it as required.