[vtk-developers] PV corner axes widget for VTK?

[Goodwin Lawlor]

Hi,
Would a "SetSliceOrder" method somewhere, orienting the
vtkAnnotatedCubeActor and vtkAxesActor against each other be useful
(maybe a subclass of vtkAssembly)? Or is this best left to
vtkImageReader::SetTransform?

How about an option for right or left handedness in vtkAxesActor?

Just some suggestions,

Goodwin

-----Original Message-----
From: vtk-developers-admin at vtk.org [mailto:vtk-developers-admin at vtk.org]
On Behalf Of dean.inglis at camris.ca
Sent: 10 May 2004 20:26
To: vtk-developers at vtk.org
Subject: Re: [vtk-developers] PV corner axes widget for VTK?


possible VTK additions

I have hammered out 3 new classes to form an Orientation Marker scheme:
the first two inherit from vtkProp3D:

              vtkProp3D 
              /            \
vtkAxesActor   vtkAnnotatedCubeActor


vtkAxesActor which is essentially vtkPVAxesActor from Paraview, and 
vtkAnnotatedCubeActor which uses 6 vtkVectorText/Actor pairs, and a
vtkCubeSource to essentially generate something very similar to what is
seen in VolView (I think VolView uses texture mapping in its orientation
marker).  Access to the cube and the text actor's vtkProperty allow for
combinations of solid and/or wireframe representations. The vector text
outlines can also 
be displayed and are generated by an internal vtkFeatureEdges.

The new widget is vtkOrientationMarkerWidget (better name anyone?) which
is essentially vtkPVAxesWidget from Paraview except that it takes any
vtkProp3D on input.  The beauty of this is that one can do something
like:

vtkOrientationMarkerWidget* widget  = vtkOrientationMarkerWidget::New();

vtkAnnotatedCubeActor* act1 = vtkAnnotatedCubeActor::New();
act1->SetFaceTextScale(0.5);

vtkAxesActor* act2 = vtkAxesActor::New();

vtkAssembly* assemble = vtkAssembly::New();
assemble->AddPart(act1);
assemble->AddPart(act2);

widget->SetOrientationMarker((vtkProp3D*)assemble);

widget->SetParentRenderer(ren1);
widget->SetInteractor(iren);
widget->SetEnabled(1);

and you end up with something very flexible that can look like the
orientation marker 
seen in Goodwin Lawlor's posted tcl example:
http://public.kitware.com/pipermail/vtkusers/2004-May/024186.html

comments/criticism?

Dean


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