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 38862×

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this tip shared by ARKANCE experts applies to: AutoCAD ·

See also:
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Tip 13847:	Pringles in AutoCAD - a hyperbolic paraboloid.
Tip 13767:	How to copy a DWG object to existing points?
Tip 13688:	How to select all DWG objects of a certain type in AutoCAD LT? (texts, circles...)
Tip 13495:	How to create a full diameter dimension with two arrows?

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