Answering my own question. The 3-tuples describe a triangle, the 4-tuples describe a quadrilateral - 2 triangles sharing 2 vertices.
Go! =ml= On Sep 7, 11:50 pm, TeamTeamUSA <miles...@gmail.com> wrote: > It seems as if the the Graphics3d Object's face_list() returns a list > of 3-tuples or 4-tuples depending upon which plot3d method you call: > > implicit_plot3d - returns an array of 3-tuples > [[(1.8974358974358974, -0.5641025641025641, -0.28205128205128216), > (1.9014844804318489, -0.5641025641025641, -0.25641025641025639), > (1.8974358974358974, -0.57692307692307687, -0.25641025641025639)],...] > > parametric_plot3d - returns an array of 4-tuples > [[(2.0, 0.0, -1.5000000000000011), (1.9917900138232461, 0.0, > -1.3721228383154951), (1.9475552876659872, 0.93789319526433457, > -1.4891191653269833), (1.9555829421271671, 0.94175910990139589, > -1.6278999850572287)],...] > > Is this a bug or as-designed? > > I'm still looking for documentation on the face_list format. Is this > all there is? $SAGE_ROOT/devel/sage/build/sage/plot/plot3d/ > index_face_set.pyx > TIA! > > Go! > > =ml= > > On Sep 5, 11:26 pm, TeamTeamUSA <miles...@gmail.com> wrote: > > > > > Upon reflection, it looks like the first item of the quadruple is the > > normal. True? > > > Go! > > > =ml= > > > On Sep 5, 10:36 pm, TeamTeamUSA <miles...@gmail.com> wrote: > > > > Apologies if this is a FAQ or is somewhere in the docs; I could only > > > find this: > > > > #http://sagemath.org/doc/reference/sage/plot/plot3d/parametric_surface... > > > > What is the format of the Graphics3d Object's face_list()? Here's > > > sample output: > > > > [(2.0, 0.0, -1.5000000000000011), (1.9917900138232461, 0.0, > > > -1.3721228383154951), (1.9475552876659872, 0.93789319526433457, > > > -1.4891191653269833), (1.9555829421271671, 0.94175910990139589, > > > -1.6278999850572287)] > > > > It looks like three vertexes and a normal. If so, which of the > > > quadruple is the normal? > > > > Go! > > > > =ml= -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
