[vtkusers] Problem moving a sphere through the 3D space

[Yumin Yuan]

Try this:

double center[3];
mSphere->GetCenter(center);
mSphere->SetCenter(point[0],point[1],center[2]);

Yumin

On Wed, Jan 9, 2013 at 6:32 AM, Imanol Muñoz Pandiella
<imanolm at lsi.upc.edu> wrote:
> Hello,
>
> in my vtk application i am visualizing a sphere in the space. I would like
> to move the sphere with the mouse along the x and y axis of the camera's
> reference frame. I mean, i don't want to modify the position in the z axis
> of the camera's reference frame.
>
> In this way, I'm using the following code during the mouse movement to
> obtain the new position of the sphere after an interaction with the mouse:
>
> double point[3];
> mCellPicker->Pick(mStyle->GetInteractor()->GetEventPosition()[0],
> mStyle->GetInteractor()->GetEventPosition()[1],
>                                     0,
> mStyle->GetInteractor()->GetRenderWindow()->GetRenderers()->GetFirstRenderer());
> mCellPicker->GetPickPosition(point);
> mSphere->SetCenter(point[0],point[1],point[2]);
>
> where mCellPicker and mStle are declared as follows:
> vtkCellPicker *mCellPicker;
> vtkInteractorStyleTrackballCamera* mStyle;
>
> The problem is the position of the sphere is modified in the x and y axis of
> the camera's reference frame and also, in the z axis. In this axis the
> sphere is placed in the middle of the zMin and zMax of the volume space.
>
> To ensure that the picker is not interacting with the rest of the actors of
> the scene, i use the following code whe the mouse button is pressed down
> without setting the actor list of the picker supposing that the picker will
> use an empty actor's list:
> mCellPicker->PickFromListOn();
>
> and the following code when the mouse button is released:
> mCellPicker->PickFromListOff();
>
> I have seen in another application that it can be done with a
> vtkPointWidget, and the translation works fine. The problem is I need this
> functionality to spheres, cylinders, semi-spheres, ...
>
> What am I doing wrong? How can I translate the sphere through the volume
> space without modifying the position of it in the z axis of the camera's
> reference frame?
>
> Thank you very much for your help!
>
> --
> Imanol Muñoz i Pandiella.
>
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