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I'm pretty sure the answer to this question is: "no". Robert Bradshaw and I implemented almost all of the 3D plotting code, and I specifically remembering not getting to this. I also just looked at the relevant source code and didn't see anything:

sage: f(x,y)=x^2+y^2
sage: G = plot3d(f, (-1,1), (-2,2))

By the way, the way this should work once it is implemented is that you'll type


and the plot would get cutoff at 2 instead of at 5 like it is currently shown.

I'm also not sure what the best way to implement this is. For some renderers it might easy -- just pass an option on to clip the viewing rectangle. One could also try to clip the 3d scene itself, but this could be arbitrarily hard.