[vtkusers] Question asked by many, answered by none. (Help!)

[Mathieu Malaterre]

jarv0075,

	Why didn't you used a vtkContourFilter ? I don't see any other way to 
deal with such difficult polydata

Sorry,
Mathieu

jarv0075 wrote:
> The demo I refer to is the standard 'cow.tcl' demo under the vtkCutter
> examples.  In this, they use the edges from vtkCutter to generate a
> polyline loop, which works fine for simple polygons but once it encounters
> holes it seems to be still trying to form one large polyline loop?  When it
> triangulates, all triangles originate from a single point, and thus it
> triangulates out to the edges of the holes, and the edges past the holes,
> making things a total mess (see screen shot)
> 
> The screen shot can be found at 
>   http://www.cs.umn.edu/~tjarvis/tri_fail.jpg
> 
> The error message is as follows:
>   ERROR: In vtkPolygon.cxx, line 1179
>   vtkPolygon (0x818da20): Possible triangulation failure
> 
> I want to be able to cut with the plane, and fill in the slice with some
> color.  Basically, to be able to triangulate the output of vtkCutter even
> when holes are present.
> 
> 
> Any help you can offer would be greatly appreciated! 
> 
> 
> On 22 Mar 2004, Mathieu Malaterre wrote:
> 
>>jarv0075,
>>
>>	You are loosing me, what 'wonderfully written samples' are you talking 
>>about. Could you please send us a demo + dataset to demonstrate the 
>>problem, or a screenshot.
>>
>>	Thanks
>>Mathieu
>>
>>jarv0075 wrote:
>>
>>> 
>>>The issue is cutting polygonal data with a plane that results in a
>>>'polygon' with holes in it.  Thus, the wonderfully written samples do
> 
> not
> 
>>>apply, in that the 'sneaky shortcut' of using the edges to make
> 
> polylines
> 
>>>sends the triangulation filter into a tizzy.
>>>
>>>Could someone point me in the right direction on how to triangulate cut
>>>polydata with holes present?   This does NOT seem like it should be
>>>difficult, but still I've seen the question asked by multiple others
> 
> and
> 
>>>haven't seen one answer surface yet.
>>>
>>>Thank you for your time and patience.
>>>
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>>
>>
>>
> 
> 
>