I've done a little more investigating, and discovered a few more things:<br>
<br>
The crash occurs when my app hits 46 degrees (I'm only doing even
degrees right now), but still crashes at 48 and 50 degrees as
well. When I reset it to start at 180, it crashed at 262 degrees
with a similar error. In my application I'm rotating by adjusting
the camera's Azimuth property.<br>
<br>
The crash seems to be coming from the VTKKWRCHelper_SpaceLeapCheck()
macro in vtkFixedPointVolumeRayCastHelper.h, which calls
CheckMinMaxVolumeFlag in vtkFixedPointVolumeRayCastMapper.h.
There seems to be some memory corruption going on that moves the actual
error point in the core dump from one to the other, but they're related.<br>
<br>
Has anyone else seen this problem before? I've filed it as bug #2029.<br>
<pre><br></pre>
<div><span class="gmail_quote">On 7/6/05, <b class="gmail_sendername">Randall Hand</b> <<a href="mailto:randall.hand@gmail.com">randall.hand@gmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I have a 128^3 volume that i'm trying to volume render. The images I get are truly stunning, good job here guys.<br>
<br>
I've written a script to rotate the volume rendering from 0 to 180
degrees, in 2 degree increments. But every time I cross the
45degree mark on any axis, it crashes with a segmentation fault.<br>
<br>
a Backtrace shows the following:<br>
<br>
[2:58:05pm]% dbx visualizer<br>
dbx version 7.3.4 (86441_Nov11 MR) Nov 11 2002 11:31:55<br>
where<br>
Core from signal SIGSEGV: Segmentation violation<br>
(dbx)<br>
Thread 0x10000<br>
> 0
vtkFixedPointVolumeRayCastMapper::CheckMinMaxVolumeFlag(unsigned
int*,int)(this = 0x14049428, mmpos = 0xfffffff9a50, c = 0)
["/viz/home/rhand/src/ezViz/Utilities/VTK/VolumeRendering/vtkFixedPointVolumeRayCastMapper.h":529,
0x5b12840]<br>
(dbx)<br>
<br>
This looks like a VTK bug to me. I've tried it with 15 different
datasets from the same project (same dimensions, etc), and all show the
same behavior.<br><span class="sg">
<br><br>-- <br>Randall Hand<br>Visualization Scientist<br>
ERDC-ITL Vicksburg, MS<br>
</span></blockquote></div><br><br><br>-- <br>Randall Hand<br><a href="http://www.yeraze.com">http://www.yeraze.com</a>