drwg 3-D tubes w/ radii using extrude & pathcurve

At least as far up as 2000, it won't work, i.e., extrude won't work along a 3D polyline. You have to draw individual circles at one end of each line or arc and extrude those. Which in turn requires a lot of manipulation of the UCS.

You can re-use the circle for an adjacent line and arc if you 0 , which causes AutoCAD to not delete the circle after using it. I usually run with delobj off, because going back and retracing your steps (to correct a mistake) is easier if the primitives are retained.

-Mike-

You can extrude a circle along a polyline, though as you mention, not a

Can't you extrude along multiple polylines in different planes as long as the plane is parallel to the UCS?

Doug T

There is a TUBEX.LSP available on the Net which extrudes a circle along of lines drawn in 3D space. Lines must not be polylines, that's a condition of this routine. I use it (the lisp) for drawing different pipes in 3D quite often. Let me know if you have difficulties finding the lisp on the Net. I will E-mail you one.

Regards,

Igor.

I better clarify that I'm no 3D wiz before continuing. I remember extruding a closed shape (polyline) along a polyline. So long as the object being extruded was perpendicular to the path, and the path was on one plane, I didn't have any trouble with it.

Hopefully that's adding to the conversation. ;)