CGAL users discussion list

[Pádraig Ó Conbhuí <>]

Hi All,

I'm looking for a way to generate a 2D mesh from the projection of a 3D one.

I have a 3D mesh with some values at each node. I'm looking to integrate these values through the z-direction onto a 2D mesh with edges conforming to the "shadow" of 3D mesh. The conforming edges is sort of important for the FEM stuff I want to do on this projection.

Ideally, I'd be able to to a rotation of my mesh, projection, triangulation and FEM solve in real-time (or as quick as possible, at least).

I imagine I could get an implicit function if I tested for the intersection of a line segment and my mesh which tells me whether a point falls in the projection or not. Is there a nice way of setting up a quick lookup, like an AABB tree, for intersections of a 3D mesh and a line? Is there a way of generating 2D meshes in 2D with implicit surfaces? There seems to be an implicit surface option for 2D surfaces embedded in 3D, but not for pure 2D in 2D. That only seems to work with a bounding polyline.

Thanks,

Paddy