Support NiFltAnimationNode
A little used NIF NiFltAnimationNode while supported by morrowind.exe, is not used by any vanilla content. It is however used by a few mods and only really used in the last couple of years. Notably by OAAB.
Basically, the record descends from NiSwitchNode and has an additional float Period field (self-explanatory, the time it takes to switch a node to the next in seconds), and also a Bounce flag (6th bit in the node flags) which apparently reverses the switching direction.
Edited by psi29a