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You haven't defined "arrowAng" variable and you are using it in (polar) function... Sorry, my mistake - you defined it firstly... [EDIT : You should changle variable "angle" to something different like "ang" as (angle) is AutoLISP function and then you should localize "ang" in main (defun) instead of "angle"...]

Change elevation only works if all points are on the same Z elevation. this might be why also flatten isn't working for you. Two things you can do to speed up. Combine all the commands into one call like you did below Command has some type of "lag" but for example lets just call it 100ms this would remove 500ms for each loop. Not to mention all the command line spam. (setvar cmdecho 0) when you sent LastEnt anything created or modified is "behind" LastEnt in the drawing and can be added to a selection set with a simple loop. rather then selecting everything in the drawing and checking against the before selection set to find the new items. (setq zList '()) ;(setq before (ssget "_X")) ;not needed anymore (command "regen" "_.copy" obj "" '(0 0 0) '(0 0 0)) (setq LastEnt (entlast)) ;set right before you create/modify objects. you want to either add to a selection (command "_.explode" newent) (while (setq LastEnt (entnext LastEnt)) ;after entities are created this will add them to a selection set. (ssadd LastEnt newents) ) (foreach e newents -edit typo in code

Just to amuse myself, here is a snippet that will flatten simple entities, not sure if that helps you along the way - you can use what code works for 3d polylines, hatches, regions and blocks - might be a bit quicker Command: NewFlatten An edit for later... (defun FlattenLines ( Pt1 Pt2 / MySS MyEnt acount ed) ;;For arcs, attdef, circle, (dimension N/A), Insert, Line, LWPolyline, Mtext, Point, text, ;;Does lines, circles, arcs, ellipses, texts, LWPolylines (if (< (car pt1)(car pt2)) (setq MySS (ssget "_W" pt1 pt2 (list '(-4 . "<OR") '(-4 . "*,*,<>") (list 10 0.0 0.0 0.0) '(-4 . "*,*,<>") (list 11 0.0 0.0 0.0) '(-4 . "<>") (cons 38 0) '(-4 . "OR>") ))) ; end list, ssget, setq (setq MySS (ssget "_C" pt1 pt2 (list '(-4 . "<OR") '(-4 . "*,*,<>") (list 10 0.0 0.0 0.0) '(-4 . "*,*,<>") (list 11 0.0 0.0 0.0) '(-4 . "<>") (cons 38 0) '(-4 . "OR>") ))) ; end list, ssget, setq ) ; end f ; (setq MySS (ssget "_X" (list ; '(-4 . "<OR") ; '(-4 . "*,*,<>") (list 10 0.0 0.0 0.0) ; '(-4 . "*,*,<>") (list 11 0.0 0.0 0.0) ; '(-4 . "<>") (cons 38 0) ; '(-4 . "OR>") ; ))) ; end list, ssget, setq (setq acount 0) (while (< acount (sslength MySS)) (setq MyEnt (ssname MySS acount)) (setq ed (entget MyEnt)) (if (equal (assoc 0 ed) (cons 0 "LWPOLYLINE")) (progn (entmod (setq ed (subst (cons 38 0) (assoc 38 ed) ed) )) ;; Elevation to 0 ) ; end progn (progn (entmod (setq ed (subst (cons 10 (mapcar '* '(1 1 0) (cdr (assoc 10 ed)))) (assoc 10 ed) ed)) ) (entmod (setq ed (subst (cons 11 (mapcar '* '(1 1 0) (cdr (assoc 11 ed)))) (assoc 11 ed) ed)) ) ) ; end progn ) ; end if (setq acount (+ acount 1)) ) ; end while ) (defun SSMouseOrder ( / MyList MySS pt1 pt2 MyEnt SelSS MySS MyDuir acount) ;; Enttypelist: wildcards are OK but not for single selection. ;; Enttypelist in CAPITALS for single entity selection to work. (princ " (Crossing selection, not single picks please). ") ;;Set up LISP (setq MySS (ssadd)) ;; Blank Selelection Set (if (= EntTypeList nil)(setq EntTypeList (list "LINE" "ARC" "CIRCLE")) ) ;; default entity filter (setq MyList (list (cons -4 "<OR") )) ;; Create filter to use with ssget (foreach n EntTypeList (setq MyList (append MyList (list (cons 0 n)) ) ) ) ; end foreach (setq MyList (append MyList (list (cons -4 "OR>")) ) ) (while (setq pt1 (getpoint "Select Objects:"));; Loop to select entities (setq pta pt1) ; record pt1 selected (if (setq MyEnt (car (nentselp pt1))) ;; If 1st point selected was on an entity: Single entity selected (progn (if (ssdel MyEnt MySS) ;; If entity is in selected selection set, delete it (progn (redraw MyEnt 4) ;; Take away highlight ) (progn ;; Else add single entity to selection set (If (member (cdr (assoc 0 (entget MyEnt))) EntTypeList) ;;Check entity type is desired (progn (setq MySS (ssadd MyEnt MySS)) ;; Add to selection set (princ (strcat " 1 Found, ")) ;; Report selection found (redraw MyEnt 3) ;; highlight entity ) ; end progn ) ; end if member ) ; end progn ) ; end if ssdel ) ; end progn (progn ;; Else if clicked point not an entity (setq pt2 (getcorner pt1 " Specify Opposite Corner")) ;;get 2nd point (if (< (car pt1)(car pt2)) ;; Left to right, right to left to determine window or crossing filter (setq SelSS (ssget "_W" pt1 pt2 MyList) ) ;; Get selected entities (setq SelSS (ssget "_C" pt1 pt2 MyList) ) ) (setq acount 0) (if SelSS ;; If anything was selected (progn (princ (strcat " " (rtos (sslength SelSS) 2 0) " Found, ")) ;; report how many entities selected (while (< acount (sslength SelSS)) ;; add entities to selection set (setq MySS (ssadd (ssname SelSS acount) MySS)) (redraw (ssname SelSS acount) 3) ;; Highlight each entity (setq acount (+ acount 1)) ;; Loop counter ) ; end while ) ; end progn ) ; end if SelSS ) ; end progn ) ; end if MyEnt (setq MyDir 0) ;; Work out mouse click directions. Note single selection direction is LL->UR (if (< (cadr pt1)(cadr pt2)) ;; Horizontal (setq MyDir 0) (setq MyDir 1) ) (if (< (car pt1)(car pt2)) ;; Vertical (setq MyDir (+ MyDir 0)) (setq MyDir (+ MyDir 2)) ) ) ; end while (setq acount 0) ;; clear highlights (while (< acount (sslength MySS)) (redraw (ssname MySS acount) 4) (setq acount (+ acount 1)) ) (if (= (sslength MySS) 0) ;; report the selection set and direction or nil if no selection nil (list MySS MyDir) ;; MyDir: 0 BL->TR (or point selection), 1 TL->BR, 2 BR->TL, 3 TR->BL ) (list pta pt2 MyDir) ; MyDir 0, 1-> L to R, 2, 3 -> R to L ) (defun c:NewFlatten ( / Pts) (princ "Selection: ") (setq Pts (SSMouseOrder)) ;;Mouse order returns Selection set points. Used later. (FlattenLines (car Pts) (cadr Pts) ) ;; flatten simple entities ) ; end defun

Depends what you are using for obj, if it is an entity name this is a bit quicker: (command "_.copy") (command obj) (command "") (command '(0 0 0) '(0 0 0)) (setq newent (entlast)) (command "_.explode" newent) becomes (command "_.Explode" (setq NewEnt (entmakex (entget obj)) ) ) where obj might be from (car (entsel)) or (ssname MySS number) Might want to look at the number of loops in the snippet you posted