CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Can't you cut by planes and then discard parts you are not interested in 
(for example discard those that are not in contact with both planes)?

You can use the AABB tree for doing the intersection with a plane.

see:
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/AABB_tree/Chapter_main.html

You can also have a look at the AABB_tree demo where the intersection
polyline of a mesh with a plane can be computed
(Algorithms -> Cut plane -> Intersection; keep 'Ctrl' while manipulating
the arcball to move the cut plane).
.

Sebastien.




On 02/02/2012 07:51 PM, gregthom992 wrote:
> HEllo experts
>
> my task at hand is to subdivide a cylindrical object into shorter segments.
> My cylindrical object is a mesh oriented along the z-axis with triangles and
> edges but it sort of bends like an N at a certain points. Now I want to
> obtain a section of the bended cylinder. I could simply clip with a plane at
> a certain z distance along the length but my trouble is clipping this way
> will yield a funny section if I clip it a the level of the "N" bend. Does
> anyone how some ideas how to go about obtaining a single continuous section
> of such a shape using CGAL ?
>
> In the image the black lines are clip planes
> In the attached image the shape is what I want to extract various sections
> of but because the shape bends on itself I get two pieces, however I wanted
> just one continuous section from the start through the end to the second
> intersection with the clip plane B.
>
> http://cgal-discuss.949826.n4.nabble.com/file/n4352427/test.jpg ?
>
> Thank
>
> --
> View this message in context: 
> http://cgal-discuss.949826.n4.nabble.com/mesh-division-tp4352427p4352427.html
> Sent from the cgal-discuss mailing list archive at Nabble.com.