I've been trying to figure this out for two days, I'd appreciate any ideas on this.
 
I have a ModelClip with 2 enabled planes and a Shape3D (QuadArray with a few hundred polygons). When I clip the shape with a single plane it works fine, but when the second plane comes in, some polygons of the shape disappear with the planes in certain positions, only to re-appear if I move one of the planes some more. Even stranger - when some of the polygons disappear, if I rotate the whole scene, they flicker (appear/disappear).
 
If I use a ColorCube istead of my Shape3D (the rest of the tree (BranchGroups) remaining the same) it works fine.
 
I've attached 2 screenshots. In the bad picture, one of the planes is translated.
 
Java2 - 1.3.0_02
Java3D - 1.2.1_04
I've tried with J3D 1.3 beta - same problem
 
Cristian
 

<<attachment: good.jpg>>

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