[vtkusers] [vtk-developers] high order vtkBoxWidget?

[Dominik Szczerba]

Hi Will,

As you have correctly guessed, I am using this widget to interactively
transform objects.
At any time the widget provides me with original (undeformed) positions of
the control points as well as the current deformation field. It can
reset/restore the control point positions and the deformation field
independently, making it suitable for constant- and non-constant reference
deformations. I thought about constraining the movement of the control
points to prevent incompatibilities, I am affraid, however, that it will
anyway not prevent the distortions in case of high order
interpolation/spline based deformations, so I do not implement it currently
(it can easily be done though). Instead, I am volume-rendering the
deformation gradient in my application to visually inspect the validity of
the deformation.

Currently the widget is independent of any interpolations - it just provides
the positions and the deformation. I do interpolations on the application
side, but integration is maybe a good idea indeed... The transform returned
by the widget (rotation, translation, scaling) is the same as that of the
vtkBoxWidget.

I am happy to clean/document what I did and submit it for a potential
inclusion to VTK, just let me know how to proceed.

Regards,
Dominik

On Mon, Jan 10, 2011 at 9:36 PM, Will Schroeder
<will.schroeder at kitware.com>wrote:

> Dominik-
>
> I am definitely interested in your work. I confess I don't fully understand
> what you've done. For example, what interpolation/transformation function
> are you using? Do you do anything fancy to constrain the points from pulling
> the grid inside our or otherwise becoming incompatible?
>
> W
>
>
>
> On Mon, Jan 10, 2011 at 8:00 AM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:
>
>> Glyphs are generated only for the vertices... For the underlying wgole
>> poly you need a separate actor.
>>
>> On Mon, Jan 10, 2011 at 1:31 PM, Meriadeg Perrinel <
>> meriadeg.perrinel at inria.fr> wrote:
>>
>>> Hi,
>>>
>>> I'm new there, but i see the attached image and i's very nice !
>>> I take the ocasion to explain a problem that i have :
>>>
>>> I connect a polyData to a mapper and draw point and lines between point
>>> (with SetLines and SetPoints).
>>> That work.
>>> But after i tried to draw points with SphereSource. For that I use a
>>> Glyph3d. So i connect the PolyData to the Glyph3d instead of directly to the
>>> mapper then
>>> I connected the Glyph3d to the mapper and make a
>>> Glyph3d.SetSource(SphereSource).
>>> So now I have Sphere Source instead of point on my screen (as I want) but
>>> the Lines between points becames invisible.
>>> I don't see them !
>>>
>>> An explanation ?
>>>
>>>
>>>
>>> Dominik Szczerba a écrit :
>>>
>>>> After extensive RTFS I have now implemented two own classes:
>>>>
>>>> vtkHighOrderCubeSource - a polydata source to construct a box with NxMxO
>>>> points
>>>>
>>>> vtkHighOrderBoxWidget - an interactive widget using the above object,
>>>> transforming the bounding box exactly as in vtkBoxWidget and in addition
>>>> displacing the high order control points. See attached image.
>>>>
>>>> Is there anyone interested in my contributing them to VTK?
>>>>
>>>> Regards,
>>>> Dominik
>>>>
>>>> On Thu, Dec 30, 2010 at 3:20 PM, Dominik Szczerba <dominik at itis.ethz.ch<mailto:
>>>> dominik at itis.ethz.ch>> wrote:
>>>>
>>>>    Hi,
>>>>
>>>>    I need something very much like vtkBoxWidget but with arbitrary
>>>>    amount of control points (1...N nodes on the box edges along with
>>>>    the corner nodes).
>>>>    Are such widgets present in VTK? If not, anyone has some pointers
>>>>    where to start implementing one?
>>>>
>>>>    Thanks
>>>>    Dominik
>>>>
>>>>
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>> ------------------------------------------------------------------------
>>>>
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>>>
>>>
>>
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>
> --
> William J. Schroeder, PhD
> Kitware, Inc.
> 28 Corporate Drive
> Clifton Park, NY 12065
> will.schroeder at kitware.com
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