[vtkusers] Cleanup and Delete()

[Matt Valerio]

Hello,

I noticed in the examples that every VTK object created is ->Delete()ed 
at the end of its use.  I know it is good programming practice to clean 
up memory, but is this necessary if all your ->Delete() calls come at 
the end of main() right before the return(EXIT_SUCESS); part?  I assume 
that the memory occupied by these objects is automatically freed when 
the application terminates?

The reason I'm asking this is because I have a sample of code at the end 
of my program that looks like this:
<code>
	// And clean up
	coneSource->Delete();
	coneMapper->Delete();
	coneActor->Delete();
	coneProperty->Delete();
	sphereSource->Delete();
	sphereMapper->Delete();
	sphereActor->Delete();
	sphereProperty->Delete();
	
	ren1->Delete();
	ren2->Delete();
	renWin->Delete(); // Get errors when this line is uncommented
	iren->Delete(); // Get errors when this line is uncommented
</code>

When I click the close button on the vtkRenderWindow, my application, 
called vtktest4, shows these errors, only when the last 2 lines are 
uncommented.

<error>
      51 [main] vtktest4 1376 handle_exceptions: Exception: 
STATUS_ACCESS_VIOLATION
    4646 [main] vtktest4 1376 open_stackdumpfile: Dumping stack trace to 
vtktest4.exe.stackdump
</error>

Any ideas why this is happening?  Am I ->Delete()ing the objects in the 
wrong order?

I am running VTK 4.2 Latest Release under Cygwin on Windows 2000 (using 
the Eclipse IDE).

Thanks!
Matt