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CAD tip # 5757:

Question

CAD
% platform category

How to draw a 3D arc or circle?

Planar (2D) entities can be drawn in 3D space using a temporary user coordinate system (UCS).

If you want to draw quickly an arc or circle from 3 given points in 3D, you can use the following LISP code (save it to a .LSP file and load with APPLOAD):

(defun c:3Darc (/ p1 p2 p3)
 (command "_ucs" "_w")
 (setq p1 (getpoint "Arc point #1: "))
 (setq p2 (getpoint "Arc point #2: "))
 (setq p3 (getpoint "Arc point #3: "))
 (command "_ucs" "_3p" p1 p2 p3)
 (command "_arc" (trans p1 0 1)(trans p2 0 1)(trans p3 0 1))
 (command "_ucs" "_p")
)

resp.:

(defun c:3Dcircle (/ p1 p2 p3)
 (command "_ucs" "_w")
 (setq p1 (getpoint "Circle point #1: "))
 (setq p2 (getpoint "Circle point #2: "))
 (setq p3 (getpoint "Circle point #3: "))
 (command "_ucs" "_3p" p1 p2 p3)
 (command "_circle" "_3p" (trans p1 0 1)(trans p2 0 1)(trans p3 0 1))
 (command "_ucs" "_p")
)

ACAD

* CAD

20.9.2007 31594×

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applies to: AutoCAD ·

See also:
Tip 12368:	Gaps - how to find loose ends on lines in a DWG?
Tip 11751:	toMulti converts polylines to multi-lines driven by a definition table.
Tip 10237:	Arc bridges (gaps) in line intersections.
Tip 10138:	Dimensioning a curve length or distance between two points on a curve.
Tip 10054:	Boolean operations on 2D polylines.

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