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Thanks, that is sobering, but at least we know what to do. One thing I tried:

grep -rnw 'sage-6.4.1-x86_64-Linux' -e "def line3d"

sage-6.4.1-x86_64-Linux/src/sage/plot/plot3d/shapes2.py:47:def line3d(points, thickness=1, radius=None, arrow_head=False, *kwds): sage-6.4.1-x86_64-Linux/src/build/lib.linux-x86_64-2.7/sage/plot/plot3d/shapes2.py:47:def line3d(points, thickness=1, radius=None, arrow_head=False, *kwds): sage-6.4.1-x86_64-Linux/local/lib/python2.7/site-packages/sage/plot/plot3d/shapes2.py:47:def line3d(points, thickness=1, radius=None, arrow_head=False, **kwds):

Then, editing shapes2.py reveals other functions closely related to line3d() and the ? operator works for them in Sage to get their doc strings, but corners(), e.g., is defined within the Line class and the ? operator doesn't work with it. So, you are right, code browsing helps a bit, but it is quite counterintuitive.

Thanks, that is sobering, but at least we know what to do. One thing I tried:

grep -rnw 'sage-6.4.1-x86_64-Linux' -e "def line3d"
line3d"
  
sage-6.4.1-x86_64-Linux/src/sage/plot/plot3d/shapes2.py:47:def line3d(points, thickness=1, radius=None, arrow_head=False, *kwds):
**kwds):
sage-6.4.1-x86_64-Linux/src/build/lib.linux-x86_64-2.7/sage/plot/plot3d/shapes2.py:47:def line3d(points, thickness=1, radius=None, arrow_head=False, *kwds):
**kwds):
sage-6.4.1-x86_64-Linux/local/lib/python2.7/site-packages/sage/plot/plot3d/shapes2.py:47:def line3d(points, thickness=1, radius=None, arrow_head=False, **kwds):**kwds):