Rostislav,
I am also interested in this.
Thanks,
-F
On Thu, Aug 7, 2014 at 10:43 AM, Rostislav Khlebnikov <
[email protected]> wrote:
> Hi Sascha,
>
> yes, I think I can make such an implementation. I'm working on it right
> now and I will make a pull request in the near future.
>
> All best,
> Rostislav.
>
> On 06/08/2014 17:04, Sascha Zelzer wrote:
> > Hi Rostislav,
> >
> > your numbers look very promising. We are using CGAL internally for
> > some projects and could move the build-system related stuff to MITK to
> > able to build CGAL with the MITK superbuild.
> >
> > I would be interested in a general interface for surface cutting
> > algorithms, so that we could use different implementations within the
> > mapper, based on their availability. Is that something you could come
> > up with, based on your previous experience? We could then modify the
> > mapper to get the highest ranked implementation and test various
> > approaches.
> >
> > Thanks,
> >
> > Sascha
> >
> > On 07/19/2014 05:10 PM, Rostislav Khlebnikov wrote:
> >> Just as a followup - with my relatively small reslice window geometry
> >> (50x50mm for full abdominal scan) - the triangle query takes 0.38ms
> >> which is 20(!) times faster than vtkCutter. And additionally it doesnt
> >> output almost any line segments that wouldn't be rendered anyway (almost
> >> being because I make one triangle that covers the quadrangular
> >> Geometry2D to avoid two queries).
> >>
> >> Rostislav.
> >>
> >>
> >> On 19/07/2014 15:57, Rostislav Khlebnikov wrote:
> >>> Hi guys,
> >>>
> >>> I noticed that with many polygonal surfaces in the scene, the rendering
> >>> process might become quite slow. I believe (haven't really tested it
> >>> thoroughly yet) that one of the most time consuming operations is
> >>> cutting the surface with 2D renderer window geometries to obtain the
> >>> contour for display. I made up a test where I compared vtkCutter with
> >>> CGAL's AABB_tree-based implementation. For model with ca 50000 faces,
> >>> the it takes 1.7ms to slice for CGAL and 7.8ms for vtk, so basically
> >>> 4.5
> >>> times faster. Even more importantly, if I use the renderer's geometry
> >>> quad (as opposed to infinite plane) the intersection time is almost nil
> >>> when the surface doesn't intersect the geometry. Tree building itself
> >>> took 220ms but obviously it's one-time operation.
> >>>
> >>> I might implement the CGAL-based 2D surface mapper. Obviously it will
> >>> probably more than double the storage required for surfaces, but I
> >>> would
> >>> make this trade. I was wondering if any other users or developers of
> >>> MITK would be interested in this or have any thoughts on this?
> >>>
> >>> Rostislav.
> >>>
> >>>
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--
Félix C. Morency, M.Sc.
Plateforme d’analyse et de visualisation d’images
Centre Hospitalier Universitaire de Sherbrooke
Centre de recherche clinique Étienne-Le Bel
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