Hi Tim, On Wednesday 20 May 2009 10:06:18 Tim Moore wrote: > > It may be helpful to dump the scene graph to a file (from the debug menu) > > once you're getting the NaN error. Hopefully the offending matrix will > > be printed with NaNs instead of valid coordinates. > > > > Tim > > I've added an --enable-fpe argument which, on Linux, will cause an abort or > core dump on a division-by-zero or other invalid floating point operation, > including generating NaNs and overflowing float-to-integer conversions. See > if you can get to the source of the NaNs using that. >
No breakthroughs yet, but just a quick progress report to keep the thread alive. :-) Thanks for your suggestions. I've been trying to track this down, but don't have anything firm yet. My current working hypothesis is that a stack corruption may be feeding bad data into the "prepare ground cache" function. As I've been tracing the problem further up the stack, I got to the point that suggests this. I'll post some more specific results later, because the core dumps are on a different machine that I don't have access to. That being the case, there's probably no bad date in the scene graph itself. I currently don't fully understand the results form the stacktrace yet. As for the --enable-fpe argument, this is probably going to be a very useful debugging tool, but enabling it resulted in a segfault inside the GUI when I wanted to click the menu to enable the autopilot... Cheers, Durk
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