[vtkusers] vtkDecimatePro Bug + hanging

[Sebastien_MARAUX]

I experienced some problems using decimatePro:

1. with a number of points = 29160, vtkDecimatePro Hangs. Is there some allocation 
to do ?

2. with a number of point = 25000 or less :
vtkDecimatePro runs but does not produce correct
output :

 decimation->SetInput(myPolyData);
 decimation->PreserveTopologyOn();
 decimation->BoundaryVertexDeletionOff();
 decimation->SetMaximumError(0.0);
 decimation->Update();

doed not respect 0 error, even when specified with 
absolute error. It keeps decimating till 10 % 
polygons  number target is reached even with a 
"not flat" set of triangles.

Setting another target percentage does affect the 
output.

I can produce more tests if needed.

Sebastien MARAUX
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