2009/2/19 Martin Sandve Alnæs <[email protected]>: > On Thu, Feb 19, 2009 at 2:21 PM, A Navaei <[email protected]> wrote: >> 2009/2/19 Martin Sandve Alnæs <[email protected]>: >>> Just a note: Images usually assume rectangular cells, dolfin currently >>> only supports simplices. >> >> Since a rectangular simplicial mesh and triangulated simplicial mesh >> share the nodes, it shouldn't be a problem. There is no link present >> in image data structure, only nodes. > > So the images have values associated with the vertices, and not with the > cells?
That's correct, here is a rectangular representation from the book 'Variational Methods in Imaging': http://s5.tinypic.com/2gxeohh.jpg When rectangular simplicial mesh is used, some people assign the image value to the cells, and some use vertices. That's what it means by 'midpoints' in the text. In the triangular case, nodes (vertexes) are the only option. -Ali > > Martin > _______________________________________________ DOLFIN-dev mailing list [email protected] http://www.fenics.org/mailman/listinfo/dolfin-dev
