How to draw 3D lines
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In two dimensions, once a starting point is determined, the other point can be represented using (x, y) or polar coordinates (r, theta). In three dimensions, once a starting point is determined, can the other point be represented not only by (x, y, z) but also by spherical coordinates or cylindrical coordinates? I hope the experts will not hesitate to share their insights.
That's how it is. AUTOCAD 2007 seems to no longer have this limitation; as long as it’s a straight line, it can be drawn in any direction.
If you enable orthogonality, you can draw in the four directions of the plane as well as along the positive and negative directions of the z-axis. If the polar axis is enabled, it’s any selected point.
I just checked, and it’s indeed the case. If drawn using the LINE command, it can be drawn in any direction. If the 3DPOLY command is used, similar to LINE, it only produces a 3D polyline. The PLINE command can only be used to draw on one plane. There must be other methods.