implicit_plot3d raises a MemoryError when the bounding box defined by
the x,y,z min/max ranges does not contain the surface. For example,
consider the following command that plots half of a sphere:
sage: var('x, y, z')
sage: implicit_plot3d(x^2 + y^2 + z^2 - 1, (x,0,2), (y,-1,1),
(z,-1,1)).show(viewer='tachyon')
when x_min (currently equal to 0) is increased until the bounding box
no longer contains the sphere (anything greater than or equal to 1
will do this), a MemoryError is raised. More specifically:
sage: implicit_plot3d(x^2 + y^2 + z^2 - 1, (x,1,2), (y,-1,1),
(z,-1,1)).show(viewer='tachyon')
(which does not contain the sphere) returns "MemoryError: Out of
memory allocating triangulation for <type
'sage.plot.plot3d.implicit_surface.ImplicitSurface'>"
Is there a way to detect this scenario so a less misleading message
could be returned? For the 2-dimensional implicit_plot command, when
the bounding rectangle does not contain the contour line, an empty
plot is returned. It would be desirable to have implicit_plot3d behave
similarly when it runs into this type of situation.
I have tested this on Sage 4.3.4 (my machine) and on Sage 4.4
(www.sagenb.org).
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