Example 7
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What the scene does

In this example, particles in the shape of a cloud will follow an object while avoiding another one.
How the setup works

The particles are will be emitted in a cloud shape using a TP Volume Emitter. TP Follow will make particles follow the preset when it is moved along a spline. To prevent the particles from clumping, a TP Particle Collision preset will be used that will keep the particles in a cloude-like shape.
While following, the particles will encounter a TP Avoid preset that will force the cloud to expand. Note that the force for the preset is set to a rather large value in order to counter the force applied by TP Follow.
Files

Movie
Scenefile