point coords = NaN on "make breakable" objects

[Joss]

I'm making a Houdini <-> Maya connector, and after some time wasted in attempts to find bug in my library, to my surprise i found that geometry produced by "make breakable" tool contains "NaN" coordinates. I mean not all points, but at some frames, some polygons(1-2 per mesh) looks like consists totally out of "NaN" points

Is it normal at all, and does anyone seen this behavior before?

GEO_Vertex vtx;
UT_Vector4 pos;
...
vtx = prim->getVertexElement(i);
pos = vtx.getPos() * wMatrix;    // <---- NaNs here
[/CODE]

What makes me really wonder is that NaNs appears not at the start of the simulation but at the frame 98, and geometry topology isn't changed at this frame - it's all the same shards, just moved a bit away. Also simulation is quite compact in space, so it's not float/double overflow.

Any other geometry seems working just fine, it seems just breakable are "buggy".

Edited March 26, 2013 by Joss

[Joss]

Actually....bell dinged in my head right after i've tried to make a workaround in plugin code for that: i recalled one of my first Houdini quick tests with breakable torus, and that it was full of strange glitches, seems that's exactly the problem i've ran into:

http://www.youtube.com/watch?v=9XbkqSWFuxg