[vtkusers] vtkPolyDataNormals - preventing error message about no data to generate normals for

[Amy Squillacote]

Hi Dave,

If you want to disable all warning, debug, and error messages coming 
from VTK, you can use the static GlobalWarningDisplayOff() method of 
vtkObject: 
http://www.vtk.org/doc/nightly/html/classvtkObject.html#4bc46239efb79cd34504ff94e1710d9c. 
Alternatively, you could send the warning, debug, and error output to a 
file using vtkFileOutputWindow: 
http://www.vtk.org/doc/nightly/html/classvtkFileOutputWindow.html.

- Amy

Hills David A wrote:
> -->
>
> Hi all,
>
> I’m using a vtkContourFilter through a vtkPolyDataNormals filter. The 
> level of the contour filter can be changed by my GUI. If it gets 
> changed to a value where there is no surface (like 0), I get a pop-up 
> vtk error message telling me that there are “No data to generate 
> normals for”. I can see why that’s happening but I’m quite happy for 
> nothing to be drawn in this case (indeed, that’s what I want it to 
> do). Is there a way to disable this message? Or, is there a way for me 
> to check if the vtkContourFilter is producing empty output and then 
> not try to render things?
>
> Thanks,
>
> Dave
>
> David Hills
> Research Scientist, General Munitions
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-- 
Amy Squillacote                    Phone: (256) 726-4839
Computer Scientist                 Fax: (256) 726-4806
CFD Research Corporation           Web: http://www.cfdrc.com
215 Wynn Drive, Suite 501
Huntsville, AL  35805