I've been getting the fatal error quite a few times today, and I get kicked out. I made my model parts as polygons and then decided I need sharper edges in some parts, so I used a convert to go to nurbs surface. I can use it about 2 times and then when I try it on a third I get the error. I did have to delete a convert op once because I didn't like the effect, is this the reason? Or am I working too fast (not waiting for the computer/Houdini to finish what it was doing)? It doesn't seem to be still working when I go to continue on. Actually, I can place the convert op and select the polygons and it's okay. But when I change it from polygon to nurbs surface that is when I get the fatal error and have to exit. Any ideas what I'm doing wrong? I did my model as polygons because I wanted to use polyextrude a lot.
I just thought of something: Are you not able to convert some faces of your polygon object? Do you have to convert the hole object? I did eventually manage to convert the parts I wanted to, but each section was basically going in the same direction. Where there was a bend, I used another convert op. I would post the hipnc file but I can't open it without getting the fatal error, so I thought no one else would be able to open it either. Oh yeah, this is in Version 6.0.286.