env_particle_trail

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This entity is not in the FGD by default.
It should not be put directly in a map.

Class hierarchy
CEntityParticleTrail ↳CBaseParticleEntity ↳CBaseEntity
EntityParticleTrail.cpp

env_particle_trail is a point entity available in all  Source games. This entity creates a trail of particles inside a moving entity. It cannot be created directly in Hammer, and the only entity that creates it is trigger_vphysics_motion.