Convex Hull Autocad Jun 2026

A widely used script that implements the Graham Scan algorithm to efficiently calculate hulls with complexity.

You can find many free LISP routines online (commonly named ConvexHull.lsp or TIN.lsp ). Alternatively, copy the code snippet at the bottom of this article into a text file and save it as ConvexHull.lsp . convex hull autocad

(defun c:ConvexHull (/ ss pts hull) (vl-load-com) (if (setq ss (ssget '((0 . "POINT")))) (progn ;; Extract points from selection set (setq pts (mapcar '(lambda (x) (cdr (assoc 10 (entget x)))) (vl-remove-if 'listp (mapcar 'cadr (ssnamex ss))) ) ) A widely used script that implements the Graham

(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) ) (defun c:ConvexHull (/ ss pts hull) (vl-load-com) (if