[vtkusers] rendering isosurface and crashing

[Jeff Lee]

dsjen at cs.unc.edu wrote:

>Hi Jeff,
>
>My use of vtkCanvas is has-a.  
>
you might try directly subclassing vtkCanvas instead.  see the 
ImagePlaneWidget.java test in cvs which does this.  most access 
violations come from trying to perform a render while modifying the 
contents of the render window (i.e. add/remove actors, changing source 
attributes, etc...).  because of the multithreaded nature of java, it is 
easy to make this happen.  you could try mutexing on your data load to 
make sure you don't render whilst modifying the data.  are you creating 
lots of threads in your application?  adding/removing actors from a 
different thread, etc...?
-Jeff

>The program does consistently crashes 
>when I load a large number of images (but works fine with a smaller 
>set), when trying to view an isosurface.  However, using volume 
>rendering techniques, such as maximum intensity projection, the 
>rendering is slow, but at least doesn't crash die with an 
>EXCEPTION_ACCESS_VIOLATION.
>
>As for code that causes it to crash, I'm not sure which code segment 
>is causing it to crash.  Are you thinking that it's somewhere with 
>vtkCanvas?
>
>I will updating my version of Java and see if that fixes the problem 
>though.
>
>Thanks,
>Dennis
>
>----- Original Message -----
>From: Jeff Lee <jeff at cdnorthamerica.com>
>Date: Tuesday, June 24, 2003 6:44 am
>Subject: Re: [vtkusers] rendering isosurface and crashing
>
>  
>
>>dsjen at cs.unc.edu wrote:
>>
>>    
>>
>>>Hi VTK Users,
>>>
>>>I'm developing an application using vtk4.0, through Java, on 
>>>WindowsXP.  I've run into a problem when trying to render an 
>>>isosurface.  I have a stack of 800x800-pixel images that form a 
>>>volume.  When viewing a subset of the stack, I'm able to render 
>>>      
>>>
>>the 
>>    
>>
>>>isosurface and manipulate it, although it does take a quite a bit 
>>>      
>>>
>>of 
>>    
>>
>>>time to render.
>>>
>>>However, when I attempt to render the entire stack, my 
>>>      
>>>
>>application 
>>    
>>
>>>thinks for a very long time before my application crashes and 
>>>      
>>>
>>Java 
>>    
>>
>>>generates an hs_err_pid####.txt file.  I've included the contents 
>>>      
>>>
>>of 
>>    
>>
>>>the text file below.  My guess is that I'm running out of memory, 
>>>      
>>>
>>but 
>>    
>>
>>>I just wanted to check to see if anyone else has encountered a 
>>>      
>>>
>>similar 
>>    
>>
>>>problem or has any suggestion.
>>>
>>>      
>>>
>>is your use of vtkCanvas has-a or is-a?  does it consistently 
>>crash in 
>>the same place?  there were some problems with jdk1.4 and winxp 
>>which 
>>were fixed with jdk1.4.1_01.  do you have some code which causes 
>>the crash?
>>-Jeff
>>
>>    
>>
>>>Thanks,
>>>Dennis
>>>
>>>
>>> 
>>>
>>>      
>>>
>>
>>    
>>
>
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