Convex Hull Autocad →

After testing and refining his script, John was thrilled to see that it worked like a charm. He could now select a set of points in AutoCAD, run the CONVEXHULL command, and instantly generate the convex hull polygon.

Generating a convex hull is more than just a math exercise; it has critical real-world applications in engineering and design:

(defun c:convexhull ( / pts ) (setq pts (ssget '((0 . "POINT")))) (if pts (progn ;; Convert selection set to point list (setq pts (mapcar '(lambda (x) (cdr (assoc 10 (entget x)))) (vl-remove-if 'listp (mapcar 'cadr (ssnamex pts))))) ;; Sort points and compute hull (simplified) (setq pts (sort-points pts)) (draw-hull (graham-scan pts)) ) (princ "\nNo points selected.") ) (princ) ) convex hull autocad

If you are using the full Civil 3D toolset, you can create a hull using surface tools without needing external code.

In simple terms:

The hull is automatically generated on your specified layer. 3. SpaTools for AutoCAD

Choose whether to create a or a filled polygon . After testing and refining his script, John was

;; Calculate Hull (Simplified Gift Wrapping Logic placeholder) ;; Note: For full production, use a robust library like 'ConvexHull.lsp' found on CAD forums. ;; This snippet below creates a bounding box for simplicity; full hull code is extensive.