Graphics() should work in 3d as a valid empty object #4604
Description
From sage-support (and this has bugged me too):
I'm not sure if this is a bug or just something I'm misunderstanding,
but for 2D graphics I can write code like this.
g = Graphics()
g += line( [ [-1,-1], [1,1] ] )
g.show()
But in 3D if I do either
g = Graphics()
g += sphere( (1,1,1), 2 )
g.show()
or
g = sage.plot.plot3d.base.Graphics3dGroup()
g += sphere( (1,1,1), 2 )
g.show()
I get the error:
ValueError: min() arg is an empty sequence
Is there something I'm missing on how to create a graphics object and
add 3D graphics to it like the way it's done in 2D?
Component: graphics
Keywords: 3d
Author: Bill Cauchois
Reviewer: Tim Dumol
Merged: sage-4.3.1.rc1
Issue created by migration from https://trac.sagemath.org/ticket/4604