Tracer

The Tracer creates splines internally, which lets Tracers be used in place of splines:

The Tracer traces the movement of particles or object vertices and creates splines from these paths. The Trace Object can also be converted to splines via the Make Editable command in the Object Manager’s Object menu. You can also simply interactively move the object to be traced in the editor view to create splines.

Example

The Tracer is well-suited for creating fading tracks for moving objects. This is done as follows:

Particles can produce a fading trail using a Tracer.
Tip:Note that the Tracer will only be evaluated correctly if an animation is rendered. Still images can produce faulty results.