3dpoly - distance- perp.....

Hello everybody,

after drawing perpendicular lines from points to a 3dpoly, I have to measure the distance between consecutive intersection 3dpoly - perpendicular line. A lisp to do this will help me a lot... See the attachment - drawing. Thanks!

3dpoly-dist.dwg

Give these a try works for lines not plines

[size=2]; offset perpendicular to line
(defun c:p2p ()
(setq tp1 (entsel "\nSelect line near end : "))
(setq tpp1 (entget (car tp1)))
(setq pt1 (cdr (assoc 10 tpp1)))
(setq pt1 (list (car pt1) (cadr pt1) 0.0)) ;reset z to zero
(setq pt2 (cdr (assoc 11 tpp1))) 
(setq pt2 (list (car pt2) (cadr pt2) 0.0)) ;reset z to zero
(setq pt3 (cadr tp1))

(setq d1 (distance pt1 pt3))
(setq d2 (distance pt2 pt3))
(if (> d1 d2)
(progn 
(setq temp pt1)
(setq pt1 pt2)
(setq pt2 temp)
)
)
(setq ang (angle pt1 pt2)
) 
(setq pt4 (getpoint "\nSelect point"))
(setq pt4 (list (car pt4) (cadr pt4) 0.0)) ;reset z to zero 
(setq ang2 (angle pt1 pt4))
(setq dist2 (distance pt1 pt4))
(setq angdiff (- ang ang2))
(setq sidel (distance pt1 pt4))
(setq offset (abs(* sidel (sin angdiff))))
(setq offsetdist (rtos offset 2 3))
(setq fromdist (sqrt (- (* dist2 dist2)(* offset offset))))
(setq fromdist2 (rtos fromdist 2 3))
(setq pt5 (polar pt1 ang fromdist))
(setq remainder (- (distance pt1 pt2)(distance pt1 pt5)))
(setq remain (rtos remainder 2 3))
(setq messg1 "The offset is ")
(setq messg2 " distance is ")
(setq messg3 " remainder is ")
(setq displayans (strcat messg1 offsetdist messg2 fromdist2 messg3 remain))
(princ "\n")
(princ displayans)


(setq pt1 nil)
(setq pt2 nil)
(setq pt3 nil)
(setq pt4 nil)

(Princ) 
) ;end defun
[/size]

[size=2]
; offset perpendicular to line
(defun c:p2pp ()
(setq pt1 (getpoint "\nSelect point 1 "))
(setq pt1 (list (car pt1) (cadr pt1) 0.0)) ;reset z to zero 
(setq pt2 (getpoint "\nSelect point 2 "))
(setq pt2 (list (car pt2) (cadr pt2) 0.0)) ;reset z to zero 
(setq ang (angle pt1 pt2))

(setq pt4 (getpoint "\nSelect offset point "))
(setq pt4 (list (car pt4) (cadr pt4) 0.0)) ;reset z to zero 
(setq ang2 (angle pt1 pt4))
(setq dist2 (distance pt1 pt4))
(setq angdiff (- ang ang2))
(setq sidel (distance pt1 pt4))
(setq offset (abs(* sidel (sin angdiff))))
(setq offsetdist (rtos offset 2 3))
(setq fromdist (sqrt (- (* dist2 dist2)(* offset offset))))
(setq fromdist2 (rtos fromdist 2 3))
(setq pt5 (polar pt1 ang fromdist))
(setq remainder (- (distance pt1 pt2)(distance pt1 pt5)))
(setq remain (rtos remainder 2 3))
(setq messg1 "The offset is ")
(setq messg2 " distance is ")
(setq messg3 " remainder is ")
(setq displayans (strcat messg1 offsetdist messg2 fromdist2 messg3 remain))
(princ "\n")
(princ displayans)


(setq pt1 nil)
(setq pt2 nil)
(setq pt3 nil)
(setq pt4 nil)

(Princ) 
) ;end defun
[/size]

Hey flopo,

check your other thread about this topic-CAB posted a routine that exactly meets your request as near as I can tell...

**edit, just curious, why do refer to it as a 3dpoly when it's an LWPOLYLINE at Z=0?