gzdoom/wadsrc/static/actors/shared/movingcamera.txt

ACTOR InterpolationPoint native
{
	+NOBLOCKMAP
	+NOGRAVITY
	+DONTSPLASH
	RenderStyle None
}

ACTOR InterpolationSpecial native
{
	+NOBLOCKMAP
	+NOSECTOR
	+NOGRAVITY
	+DONTSPLASH
}

ACTOR PathFollower native
{
	+NOBLOCKMAP
	+NOSECTOR
	+NOGRAVITY
	+DONTSPLASH
}

ACTOR ActorMover : PathFollower native
{
}

ACTOR MovingCamera : PathFollower native
{
	CameraHeight 0
}