dbate...@dbateman.org schrieb: > On Sun, Mar 08, 2009 at 01:14:49PM -0600, Daniel J Sebald wrote: > >> Martin, >> >> Using depthorder is creative. I'd like to point out that depthorder is >> only an approximation to what should be "hidden surfaces". I worked on >> many aspects of gnuplot. Although gnuplot does have a hidden line >> algorithm (i.e., it can break a mesh into line segments--based on >> intersections of lines--and discard those segments which are hidden by a >> surface), it doesn't have an algorithm that breaks surfaces into >> triangles--based on intersections of surfaces--and discard hidden surfaces. >> So depthorder is an approximation that quite often has patch that seems out >> of place, sticking through a surface it shouldn't, etc. >> > > Martin's solution works as his isosurface function returns triangles for > the polygons. If we wanted to use the "patch" function of octave for 3D > patches we'd have to handle patches with an arbitrary number of points. > We could quite easily relax the constraint on 3D filled patches in > Octave to instead of not permitting them, to allow only 3D filled > patches with three points. That would allow Martin's code into the core > of Octave. > > I think we should move this discussion to the maintainers list. Although almost all octave developers are also subscribed here, I don't think John is. Allowing only triangles for the gnuplot backend sounds reasonable to me, if it allows trisurf and isonormals to work.
But again, I think John should be included in this discussion. Martin, can you start a new thread on octave-maintainers? Kai ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Octave-dev mailing list Octave-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/octave-dev
