[vtkusers] VTK without the V(isualization)

[Brian Davis]

Investigating

​GetPlanes() : vtkBoxRepresentation
<http://www.vtk.org/doc/nightly/html/classvtkBoxRepresentation.html#a215b315283dbd5bf07d9e998d6e423bd>
, vtkBoxWidget
<http://www.vtk.org/doc/nightly/html/classvtkBoxWidget.html#aff329326cf6d9539bdf73d8471034623>
, vtkClipConvexPolyData
<http://www.vtk.org/doc/nightly/html/classvtkClipConvexPolyData.html#a9c8386b8399a92d7715ca0accde83d7b>
, vtkFrustumSource
<http://www.vtk.org/doc/nightly/html/classvtkFrustumSource.html#ad258e57d67508896a08a24c4c9e1b88a>

a little further reveals

virtual vtkPlaneCollection
<http://www.vtk.org/doc/nightly/html/classvtkPlaneCollection.html>*
vtkClipConvexPolyData::GetPlanes ( )

is not the same as

void vtkBoxRepresentation::GetPlanes ( vtkPlanes
<http://www.vtk.org/doc/nightly/html/classvtkPlanes.html> *  *planes*)

and

void vtkBoxWidget::GetPlanes ( vtkPlanes
<http://www.vtk.org/doc/nightly/html/classvtkPlanes.html> *  *planes*)

and hey... why would it be for consistency sake?

or for that matter:

virtual vtkPlanes <http://www.vtk.org/doc/nightly/html/classvtkPlanes.html>*
vtkFrustumSource::GetPlanes ( )

Not that I need a Frustrum.

So I look into vtkClipConvexPolyData and vtkPlaneCollecion to see if I can
get vtkPlanes* and of course I can't.  I get the feeling that vtk is a bit
fractured.

Can someone explain to me why what is seemingly similar things in vtk have
such different interfaces that don't seem to play nice with (itself) it's
own api?
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