[vtkusers] 3D Slicing | vtkImageResliceMapper | No motion of cutplane in one of 3 axes (yaw)

[David Gobbi]

Hi Debjit,

Your question is of the sort that is very difficult to understand without some
sort of visual aid.  Do you have any diagrams that illustrate exactly what
you want to achieve?  Do you have screenshots to demonstrate what the
system is doing right now?

  David


On Wed, Jan 15, 2014 at 12:26 PM, Debjit Ghosh <dghosh at chla.usc.edu> wrote:
> I have been using the vtkImageResliceMapper to slice through a 3D volume
> using the following logic (thanks to David Gobbi) where I am able to slice
> in 2 out of 3 axes only. When I change the orientation of the slice in the
> yaw direction there is no movement of the cut plane. I am not sure what I am
> doing incorrectly here or whether this is a limitation of the system.
>
> Here is the code snippet which implements the slicing using the camera and I
> wonder if it has to do with the default_norm that I have set to [0,0,1]:
>
> matrix_= imageslice->GetMatrix();
> matrix_->MultiplyPoint(default_viewup, this->view_up);
>
> //matrix is a 3x3 rotation matrix which defines the orientation of the
> cutplane
> matrix->MultiplyPoint(this->default_norm, this->normal);
>
> double focalPt[] = {0,0,0};
> double centerofvol[] = {dimX/2, dimY/2, dimZ/2}; double origin[] = {dimX/2,
> dimY/2, 0};
>
> vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New();
> plane->ProjectPoint( centerofvol, focalPt );
>
> position[0] = focalPt[0] + distfromcam * this->normal[0]; position[1] =
> focalPt[1] + distfromcam * this->normal[1]; position[2] = focalPt[2] +
> distfromcam * this->normal[2];
>
> cam->SetPosition(position);             //Orientation of the slice plane
> cam->SetFocalPoint(focalPt);    //Point at which my plane is fixed
> cam->SetViewUp(this->view_up);
> cam->SetWindowCenter(win_center_x, win_center_y);