Bug in list_plot3d?

[P Purkayastha]

If I plot 2 points using list_plot3d, then they are correctly joined by a line. If I increase the number of points to 3, then I don't get a plane and instead get a bizarre shape with a "floor" suddenly appearing out of nowhere. See the output of

list_plot3d([(0,0,1), (1,2,2), (0,1,0)], interpolation='nn', num_points=200, point_list=True)

at http://test.sagenb.org/home/pub/37/

Is this a bug in list_plot3d?

[kcrisman]

On Sunday, April 1, 2012 3:56:41 AM UTC-4, P Purkayastha wrote:

If I plot 2 points using list_plot3d, then they are correctly joined by a line. If I increase the number of points to 3, then I don't get a plane and instead get a bizarre shape with a "floor" suddenly appearing out of nowhere. See the output of

list_plot3d([(0,0,1), (1,2,2), (0,1,0)], interpolation='nn', num_points=200, point_list=True)

    if isinstance(v, list):

        if len(v) == 0:

            # return empty 3d graphic

            from base import Graphics3d

            return Graphics3d()

        elif len(v) == 1:

            # return a point

            from shapes2 import point3d

            return point3d(v[0], **kwds)

        elif len(v) == 2:

            # return a line

            from shapes2 import line3d

            return line3d(v, **kwds)

But then it returns a list_plot3d_tuples and apparently this function is extended by zero outside of its surface.  I guess that makes sense.  Maybe we should also special-case len(v)==3 to make a plane?  I don't use this, so I don't know whether that would be good or bad to change for the "typical" use case.

[P Purkayastha]

I uploaded a patch at http://trac.sagemath.org/sage_trac/ticket/12798 to
fix this issue. It needs a review. :)