[with patch at #1833; needs review] ctl-c doesn't exit job in parametric_plot3d

[wdjoyner]

The following paraterization of the Mobius strip
takes a very long time and won't quit when ctl-c is
used:

sage: u,v = var("u,v")
sage: parametric_plot3d([cos(u)*(1+v*cos(u/2)), sin(u)*(1+v*cos(u/2)), v*sin(u/2)], (-2, 2), (-2, 2)).show()
^D
^CControl-C pressed.  Interrupting Maxima. Please wait a few seconds...

This error message repeats ever time you proess ctl-c.

Component: graphics

Issue created by migration from https://trac.sagemath.org/ticket/1737

[wdjoyner]

comment:1

This works much faster:
sage: parametric_plot3d([0.5cos(u)(1+vcos(u/2)), 0.5sin(u)(1+vcos(u/2)), v*sin(u/2)], (u,-2, 2), (v,-2, 2)).show()

and is more efficient.

[williamstein]

comment:3

This is fixed by #1833.

[sagetrac-mabshoff]

comment:4

Merged in Sage 2.10.1.alpha1 (patch from #1833)