[vtkusers] Help Using vtkPolygonalHandleRepresentation3D for Transform application

[Anant Vemuri]

Thank you Karthik. Could I get suggestion from you about where to start from
on this. Is there an example that I refer to?
-----------
Anant S. Vemuri
email: ajar108 at gmail.com



On Fri, Mar 12, 2010 at 12:55 PM, Karthik Krishnan <
karthik.krishnan at kitware.com> wrote:

> This is an issue that remains to be dealt with. Although the
> widget-representations derive from vtkProp and hence support the use
> of UserTransform's, the interactors that drive the these
> transformations into account. This leads to a mismatch between the
> positions that the interactor believes the widget is placed at and the
> actual position/orientation of is geometry.
>
> This is not an easy issue. Most widgets can get transformed into an
> invalid state by giving users the flexbility of transforming them with
> UserTransform's. This includes image plane widgets, contour widgets
> etc.. It also does not play very nicely with the point placer
> framework that is designed to restrict the widget placement to certain
> locations / regions etc.
>
> What I would recommend is that you create a customized
> widget-representation pair for your needs. The handle widget as
> designed now is not meant to handle UserTransforms.
>
> Thanks
> --
> karthik
>
> On Thu, Mar 11, 2010 at 11:17 PM, Anant Vemuri <ajar108 at gmail.com> wrote:
> > Hi,
> > I am using vtkPolygonalHandleRepresentation3D to control position of a
> model
> > I created. I am trying to apply a transformation matrix to it to make it
> > move in a predefined way. For doing this I have a bunch of vtkTransforms.
> > At first, (before using vtkPolygonalHandleRepresentation3D) I applied the
> > transform through the Actor using myActor->SetUserTransform(
> myvtkTransform
> > )
> > But since I also wanted to create an interaction with the object, I put
> it
> > inside a vtkPolygonalHandleRepresentation3D by deriving a class called
> > myObjectRepresentation from vtkPolygonalHandleRepresentation3D. But now I
> am
> > no longer able to apply the transform to the object properly.
> > Since vtkPolygonalHandleRepresentation3D has a member variable called
> Actor,
> > I created a function
> > void myObjectRepresentation::SetTransform( vtkTransform *_trf )
> > {
> > this->Actor->SetUserTransform( _trf );
> > }
> > This does the trick, but after I apply the trasnform I am not able to
> > interact with the object properly. It moves in some random direction when
> I
> > try to move it.
> > Can someone help me out. I can provide more details on request.
> > Thank you.
> >
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