[vtkusers] How to use vtkBooleanOperationPolyDataFilter correctly

Cory Quammen cory.quammen at kitware.com
Wed Oct 8 21:05:37 EDT 2014

This particular problem looks like it stems from the distance
computation from one of the surfaces to another, which is computed in
vtkImplicitPolyData. It looks like the normal used in this calculation
is being flipped for the missing triangles. I'm tracking it down.


On Wed, Oct 8, 2014 at 1:18 PM, Cory Quammen <cory.quammen at kitware.com> wrote:
> Hi Santosh,
> Your input geometries are fine. I, too, see missing polygons from the
> output. This is definitely not expected. These missing triangles are
> apparently being misclassified as to whether they belong to the union
> or intersection surface.
> I'll take a look to see if there is a quick fix for this.
> Cory
> On Wed, Oct 8, 2014 at 9:23 AM, santosh <scbiradar at gmail.com> wrote:
>> Hi Cory,
>> I tried the vtkBooleanOperationPolyDataFilter on two closed surfaces which
>> are intersecting with each other.
>> I made sure that the normals of both the closed surfaces point outwards.
>> After i perform a union operation using the
>> vtkBooleanOperationPolyDataFilter, I get holes in the
>> final result. I am attaching the two individual STL files and the result of
>> the union operation. I am aslo attaching an image that shows the holes in
>> the resultant STL file. Is this expected behavior ? Can I do something to
>> get a surface without any holes?
>> input_1.stl <http://vtk.1045678.n5.nabble.com/file/n5729039/input_1.stl>
>> input_2.stl <http://vtk.1045678.n5.nabble.com/file/n5729039/input_2.stl>
>> output.stl <http://vtk.1045678.n5.nabble.com/file/n5729039/output.stl>
>> union.png <http://vtk.1045678.n5.nabble.com/file/n5729039/union.png>
>> Cheers,
>> Santosh
>> --
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