[vtkusers] intersection of two boxes

[Dean Inglis]

Hi all.

 

I have been trying for several days now to visualize

the intersection of two boxes: one is axis aligned (x,y,z), the

other is oriented obliquely to the other such that

some vertices of the second box can be outside

of the volume of the first box.  I have tried vtkCutter,

vtkClipDataSet, vtkClipPolyData, vtkBoxClipDataSet,

vtkClipVolume all with vtkImplicitFunctions such as vtkPlanes and

vtkBox but no luck.  I have represented the boxes as

vtkImageData or vtkRectilinearGrid or even vtkPolyData 

generated by vtkCubeSource.

 

 The best I could do was create two vtkBox objects and pass them 

to  a vtkImplicitBoolean and then sample its output

with vtkSampleFunction and then use vtkContourFilter

to pull out the isosurface of the intersection between

the two boxes.  This last pipeline does not produce

the "crisp" edges that I am looking for (see attached jpg). 

Im looking for the kind of quality you can achieve using 

vtkCutter with a vtkPlane to cut through a vtkImageData: 

as is done internally with vtkImplicitPlaneWidget (I guess I'm

looking for a vtkImplicitVolumeWidget).

 

Has anyone tackled this scenario before or does anyone

have any recommendations?  

 

Dean

 

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