On Fri, Mar 16, 2012 at 09:28:41AM +0000, Garth N. Wells wrote: > On 16 March 2012 09:17, Johan Hake <hake....@gmail.com> wrote: > > Hello! > > > > I have implemented a new version of UnitSphere based on subdivision of an > > initial octahedral surface mesh and tetrahedralization using the CGAL > > framework. > > > > This is all fine, but CGAL uses alot of time tetrahedralizing the initial > > surface mesh. CGAL is also doing some funny things with the surface mesh. > > > > 1) It subdivide the initial surface mesh, which I want to prevent. Is > > that possible. > > 2) 1) results in small triangles on the surface, but large triangles > > in the interior. I set a tentative volume constraint based on the > > size of a triangle of the input mesh. > > > > You can try it out here: > > > > bzr branch lp:~dolfin-core/dolfin/hake-trunk > > > > from dolfin import * > > mesh = UnitSphereNew(4) > > # Do not try larger subdivisions than 4, at least for now. > > > > Did you look at the CGAL demo for generating a mesh or a sphere: > > > http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Mesh_3/Chapter_main.html#Subsection_50.3.1 > > ? It uses an implicit surface description. I has planning to add > support for meshing geometries from implicit descriptions.
We (Johannes, Benjamin and myself) are planning to port the Netgen Python wrappers for CSG (Constructive Solid Geometry) to DOLFIN C++ based on CGAL (which will allow boolean operations). Is this the same thing? -- Anders > Garth > > > > > Johan > > > > _______________________________________________ > > Mailing list: https://launchpad.net/~dolfin > > Post to : dolfin@lists.launchpad.net > > Unsubscribe : https://launchpad.net/~dolfin > > More help : https://help.launchpad.net/ListHelp > > _______________________________________________ > Mailing list: https://launchpad.net/~dolfin > Post to : dolfin@lists.launchpad.net > Unsubscribe : https://launchpad.net/~dolfin > More help : https://help.launchpad.net/ListHelp _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : dolfin@lists.launchpad.net Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
