[vtkusers] Ray interesection with volume - finding the mouse position

[polys_poly at hotmail.com]

Actually i want to be able to pick some actors (polygons) that i am rendering with the brain volume so that i can calculate and display the surface area of the picked actor.
In the beginning i asked about finding the mouse position but this is not needed since i found out about the pick functions of VTK (i'm a newbie). Hope the links you gave me will help

Thanks, Polys


From: Julian Ibarz 
Sent: Thursday, May 08, 2008 4:13 PM
To: polys_poly at hotmail.com ; vtkusers at vtk.org 
Subject: Re: [vtkusers] Ray interesection with volume - finding the mouse position


I don't know what you want exactly but if you want to find the points of the volume or the actors picked by the mouse you have in the VTK nightly version :

http://www.vtk.org/doc/nightly/html/classvtkPointPicker.html
http://www.vtk.org/doc/nightly/html/classvtkPropPicker.html

To get the mouse position :

http://www.vtk.org/doc/nightly/html/classvtkRenderWindowInteractor.html

You are working with what programming language ? C++ ? Java ? other ? To get the mouse position it's change with the language. For example in java you create a vtkCanvas to draw the rendering and override the methode MouseMoveEvent(MouseEvent e) to get the new position of the mouse when it moves and get the position with e->x and e->y...

This answers your question ?


2008/5/8 <polys_poly at hotmail.com>:

  Hello,

  Currently i am creating a volume of a DICOM Dataset. The interactor i am using is vtkInteractorStyleTrackballCamera. 
  What i want to do is finding the mouse pointer location on the rendering window, and then finding the ray that connects the position of the camera with the mouse position so i can find the points of the volume or the actors that this ray intersects.

  I would appreciate any help on this subject.

  Thanks,
  Polys

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-- 
Julian Ibarz 
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