Particles

From ZDoom Wiki

The default for particles is, that they stay at their given z-height with the NOBLOCKMAP flag set.
In the case, where particles are attached to a sector, which moves up ( or down), then the particles will not move with the sector.

Graf Zahl offered a remedy to this predicament:
http://www.doomworld.com/vb/showthread.php?s=5953118e307f51568299cfc4742fa5dc&threadid=40461

If you want the fountain to move with the sector you have to clear this flag through a new DECORATE definition.

For example, for the red particle fountain, define:

ACTOR NewRedParticleFountain : RedParticleFountain 10000
{
-NOBLOCKMAP
}

Conversely, if you need a fountain to move down with a sector as well and the fountain is always supposed to be on the ground, add -NOGRAVITY as well.