objects flickering in anim

[proces2]

i am having some flickering problems just with certain objects in an animation. in the scene, it is only a series of tree objects that are flickering from light dark between frames that were rendered on different machines.

the only difference in these objects versus all the others (that aren't flickering) is that they have a vray mat wrapper applied to them. the trees are bionatics trees that have been converted to mesh and a vray mat wrapper applied to all the materials for the trees.

any suggestions as to why this is happening?

i know sometimes this is caused by using cracked versions of vray. i assure everyone though that all my versions of vray are legal and authorized.

thanks,
sean

[proces2]

here's a short WIP showing the problem:

http://www.proces2.com/vray/optionA09-3.wmv

[vlado]

What are the trees? I mean, how did you do them?

Best regards,
Vlado

[proces2]

the trees were made with the Bionatics EasyNAT plug-in in VIZ - then converted to an editable mesh and brought into MAX (5.1). For each tree type, they are all instanced copies of the same tree.

sean