[Paraview] Intuitive Transform Filter

[Utkarsh Ayachit]

Look at Server/Filters/vtkPVTrackballMoveActor.* (it's present even in 
the ParaView 3 repository).

The code relies on vtkCameraManipulatorGUIHelper to locate the "active 
source" and then move it to some position. In PV3 we haven't implemented 
this helper (in Paraview 2.6 there's vtkPVCameraManipulatorGUIHelper). 
We'll have to create one which uses the GUI knowledge about which source 
is currently active etc etc to provide the implementation for the 
interface.

As I look at the interface of vtkCameraManipulatorGUIHelper, I think it 
can be improved to be able to pick the active source based on the 
location of mouse down. Then the GUI (read Qt) specific knowledge about 
which is the current source will no longer be needed. However, we'll 
still need to provide an implementation for the 
vtkCameraManipulatorGUIHelper at the server manager level since this 
class is not aware of proxies and does not know how to change the 
properties of a proxy.

Utkarsh



Robert Maynard wrote:
> Could you please explain this a bit more? Or point me in the right 
> direction inside the 2.6 code?
> 
> On 10/9/07, *Utkarsh Ayachit* < utkarsh.ayachit at kitware.com 
> <mailto:utkarsh.ayachit at kitware.com>> wrote:
> 
>     It just as easily be implemented as a CameraManipulator where as the
>     user interacts the "Transform" properties on the display tab are
>     updated. I believe this used to be supported in ParaView 2.6.
> 
>     Utkarsh
> 
> 
>     David E DeMarle wrote:
>      > I don't know of any plans to put this in, but it would certainly
>     be a
>      > nice feature to add.
>      >
>      > Two avenues to explore for implementing this:
>      >   One, use the transform filter and add a widget to modify the
>      > transform with the mouse. (I assume there isn't one in now but I
>     could
>      > be wrong).
>      >   Two, look at how Qt/Core/pqRubberBandHelper.cxx swaps out the
>     normal
>      > camera manipulation interactor style for the
>      > vtkInteractorStyleRubberBandPick. Something similar could be done to
>      > swap in a vtkInteractorStyle{Joystick|Trackball}Actor.
>      >
>      > hth
>      > Dave DeMarle
>      >
>      > On 10/9/07, Robert Maynard <RobertJMaynard at gmail.com
>     <mailto:RobertJMaynard at gmail.com> > wrote:
>      >> I have been reading about an object mode in vtk, that allows the
>     user to
>      >> actually move object with the mouse. Is there any plans in the
>     paraview
>      >> development to change the transform filter, to use a more intuitive
>      >> interface? If this is not planned, what would be required to get
>     something
>      >> like this working in paraview by my self?
>      >>
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