VTK Synchronized MPR behavior issue(Re-initiating)

BadCookie · July 26, 2021, 12:15pm

Hi all,

I wanted to link the 3 views axial, coronal and sagittal views so that when mouse interaction takes place on one view, it simultaneously updates the other views.

Things I’ve tried…

I have tried the following example MPR code, I’m able to iterate over the slices for my 3 views, when interacted with independently.

github.com

Kitware/VTK/blob/master/Examples/ImageProcessing/Cxx/ImageSlicing.cxx

/*=========================================================================

  Program:   Visualization Toolkit
  Module:    ImageSlicing.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
//
// This example shows how to load a 3D image into VTK and then reformat
// that image into a different orientation for viewing.  It uses
// vtkImageReslice for reformatting the image, and uses vtkImageActor
// and vtkInteractorStyleImage to display the image.  This InteractorStyle
// forces the camera to stay perpendicular to the XY plane.

This file has been truncated. show original

Next, this example I tired, which gave me the idea to link the views based on the camera.
https://programmersought.com/article/98624257857/

Integrating the knowledge gained from that second link into the first link, I added InteractionEvent callback to the three interactors for those 3 views with interactorstyle of vtkInteractorStyleTrackballCamera and it works fine the 3 views are dependent and on interaction on any view, the other views move too! But, trackballCamera style is not what I need.

Basically I need it to be based on vtkInteractorStyleImage But when I use this interactorstyle, for some reason, again the 3 views become independent i.e interaction on one view only moves through slices of that view.

Not sure, what I’m doing wrong here. Is it something to do with vtkInteractorStyleImage which is causing this behavior ?
Any examples or direction to proceed is apprecitiated.

Thank you in advance!

lassoan · July 27, 2021, 8:19pm

Instead of creating a new topic, you can bump a topic by adding a post to it, maybe @mentioning people that you think could help.

These VTK’s interactors are good for simple examples and can serve as a basis for implementing interactors in full-featured applications.

If there are simple changes that you would recommend that would make your life easier then feel free to send a merge request.

If you want to have a 4-pane viewer then I would recommend not to reimplement this from scratch, as it will become very complex very quickly as you are adding features. Instead, find a VTK-based application that already has this feature (ParaView for engineering visualization, 3D Slicer for medical visualization, etc.) and extend/customize these application frameworks to do exactly what you need.