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Another option is the sage.plot.plot3d.tachyon.Tachyon interface (which is imported into the global namespace by default). Basically, you create a Tachyon scene instance, setup the contents of the scene, then render. Here is a slightly modified example from the Tachyon docstring:

sage: t = Tachyon(xres=512,yres=512, camera_center=(3,0.3,0), look_at=(0,0,0), updir=(0,0,1))
sage: t.light((4,3,2), 0.2, (1,1,1))
sage: t.texture('t0', ambient=0.1, diffuse=0.9, specular=0.5, opacity=1.0, color=(1.0,0,0))
sage: t.texture('t1', ambient=0.1, diffuse=0.9, specular=0.3, opacity=1.0, color=(0,1.0,0))
sage: t.texture('t2', ambient=0.2,diffuse=0.7, specular=0.5, opacity=0.7, color=(0,0,1.0))
sage: k=0
sage: for i in srange(-1,1,0.05):
...    k += 1
...    t.sphere((i,i^2-0.5,i^3), 0.1, 't%s'%(k%3))
...
sage: t.show()

The key here is the first line--the arguments camera_center, look_at, and updir, which are quite self-explanatory.

The only problem with this mechanism is that you must directly use Tachyon's methods to construct objects instead of Sage's usual plotting interfaces. (Graphics3d, plot3d, parametric_plot3d, etc.)