[vtkusers] intersecting polygons

[Richard Brown]

Thanks for the reply Cory.

Found a simpler solution by using vtkCylinderSource and vtkCubeSource which can then be subtracted using vtkIntersectionPolyDataFilter.

Regards,
Richard

> On 01 Apr 2015, at 16:01, Cory Quammen <cory.quammen at kitware.com> wrote:
> 
> There is no filter in VTK that I know of that will do this. The complaint that a vtkImageData is required is because that filter expects vtkImageData as input, and you gave it vtkPolyData - in other words, it won't work.
> 
> You might try this contribution on the VTK journal: http://www.vtkjournal.org/browse/publication/949 <http://www.vtkjournal.org/browse/publication/949>
> 
> HTH,
> Cory
> 
> On Wed, Apr 1, 2015 at 5:24 AM, mbcx9rb9 <richard.j.brown at live.co.uk <mailto:richard.j.brown at live.co.uk>> wrote:
> Hi all,
> 
> A very simple question I think. I'd like to produce a polygon representing
> the overlap between two overlaps (in this case a circle and a rectangle). I
> have tried vtkImageDifference and vtkIntersectionPolyDataFilter to no avail.
> 
> I generated the circle using vtkRegularPolygonSource and the square with
> vtkPoints with vtkPolyon to create a vtkCellArray to create vtkPolyData.
> 
> My problem, however, is when using SetInputConnection for vtkImageDifference
> or vtkIntersectionPolyDataFilter, I get the error "Input for connection
> index 0 on input port index 1 for algorithm
> vtkImageDifference(0x7ff2ea844400) is of type vtkPolyData, but a
> vtkImageData is required."
> 
> Can anyone give me any pointers? It seems like such a simple task but I'm
> stumped.
> 
> Regards
> 
> 
> 
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> Cory Quammen
> R&D Engineer
> Kitware, Inc.

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