[vtkusers] vtkCutter + quadratic cells + invalid heap allocation size + VTK 4.5

[Mathieu Malaterre]

John,

	Could you please give a try to the latest version of 
vtkQuadraticHexahedron ? I guess you are building your own VTK, so this 
should be easy just go to:

http://www.vtk.org/cgi-bin/cvsweb.cgi/VTK/Common/vtkQuadraticHexahedron.cxx

	And click on 'download' right next to 'revision 1.23'. Then simply copy 
the file downloaded to VTK/Common. Go to your VTK bin directory and 
build it.

	Then try your example again. If this doesn't work, we'll have to work 
on an example code so that I can reproduce the bug.

Thanks for your time
Mathieu

John Platt wrote:
> Hi all,
> 
>  
> 
> I am getting a memory exception cutting quadratic hexes after rotating 
> the plane widget for a few seconds.
> 
>  
> 
> There is some unusual behaviour in the following code :
> 
>  
> 
> void vtkQuadraticHexahedron::Subdivide(vtkPointData *inPd, vtkCellData 
> *inCd,
> 
>                                        vtkIdType cellId)
> 
> {
> 
>   …..
> 
>   //Copy point and cell attribute data
> 
>   this->PointData->CopyAllocate(inPd,27);
> 
>  
> 
> Each time the point data is copied, the number of arrays in the field 
> increases by 1. So after cutting 32 hexes I get 34 arrays (only 2 of 
> these are in the input data). This number keeps growing as the plane is 
> moved.
> 
>  
> 
> I don’t think this is helping. Has anybody any suggestions for a solution?
> 
>  
> 
> The particular version of vtkQuadraticHexahedron is 1.21.
> 
>  
> 
> Apologies in advance if this has already been resolved.
> 
>  
> 
> Many thanks,
> 
>  
> 
> John.
> 
>  
> 
>  
> 
>  
>