Hi Thomas, Writing a custom mapper that performs special rendering for your data object is probably the way to go. In the mapper's GenerateData() Method, you have access to the world geometry and screen geometry. You can instantiate arbitraty VTK actors that represent your object, including helper objects like your circles.
Take a look at http://www.vtk.org/Wiki/VTK/Examples/Cxx and http://www.vtk.org/Wiki/VTK/Tutorials for rendering examples, including 2D annotations in the 3D scene. Regards, Jochen > -----Ursprüngliche Nachricht----- > Von: Thomas Wolf [mailto:[email protected]] > Gesendet: Freitag, 11. Februar 2011 10:55 > An: Wegner Ingmar > Cc: [email protected] > Betreff: Re: [mitk-users] accessing camera perspective / viewplane upon > vtkWidgetRepresentation construction > > Hi Ingmar, > > thanks for the info. I studied the rendermapper (again :) ) and i am > still not sure what if it is what i need. > > I try to be more specific: > What i am aiming at is revamping the trackball interacion in the 3d > view. At the same time i want to modify the trackballs representation to > give a more intuitive feedback while transformning geometry. While > doeing this, i draw three 3d circles (in different colours) around the > object (which needs the 3d contect otherwise occlusion won't be handled > correctly) and on the other hand i want the circles to be constant size > to the viewer, ie. they should not scale with the distance to the > obserevr camera. Third, i want to place a 4th circle in the view plane > of teh active camera (so, 2D), with a radius a little bigger than the > other three circles. > > I am not sure till now ( for drawing the reprsentation ) where to hook > into the pipeling to dra 3d and 2d interdependent on each other at the > same time... > > As far as i understood ill now, the mappers abstract a certain > (topology) type of geometry to the respective hardware implementtion > underneath (mapperGL, etc..). > > I hope that clarifies a bit what i try to get working :) > > Regards, > Thomas > > On 10.02.2011 11:16, Wegner Ingmar wrote: > > Hi Thomas, > > I don't understand what you are about to do, > > but are mappers what you are asking for? (http://docs.mitk.org/nightly- > qt4/classmitk_1_1Mapper.html) > > See sequence diagram on http://docs.mitk.org/nightly-qt4/Rendering.html > > A mapper takes care of drawing one special kind of data. If you create your > own data you also need a special mapper. And if you want something to be > differently drawn, you can write a modified mapper. > > Maybe a look into the mapper classes helps. > > > > Best Regards, > > Ingmar > > > > > > ------------------------------------------------------------------------------ > The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: > Pinpoint memory and threading errors before they happen. > Find and fix more than 250 security defects in the development cycle. > Locate bottlenecks in serial and parallel code that limit performance. > http://p.sf.net/sfu/intel-dev2devfeb > _______________________________________________ > mitk-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/mitk-users ------------------------------------------------------------------------------ The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: Pinpoint memory and threading errors before they happen. Find and fix more than 250 security defects in the development cycle. Locate bottlenecks in serial and parallel code that limit performance. http://p.sf.net/sfu/intel-dev2devfeb _______________________________________________ mitk-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mitk-users
