Convert 3D Polyline to 2D Polyline

[Mark_Anif 10]

Hi all..

 

can help me how to convert 3d polyline to 2d polyline in autocad 2008?

 

thank you..

[ttray33y 10]

have you tried the CONVERT command?

[guran 18]

You can try this: https://apps.exchange.autodesk.com/ARCH/en/Detail/Index?id=appstore.exchange.autodesk.com%3aflatten_windows32and64%3aen I don't know if it works in ACAD 2008 though.

[eldon 103]

Have you tried the Flatten command?

[rkmcswain 107]

Although flatten will change all of the vertices of a 3D polyline to 0.0, the entity will technically remain a "3D polyline" (the bitcode 8 is still set on group code 70).

 

So you'll have a "2D" polyline as far as the "Z" coordinates all being 0.0, but if a application is testing this entity for a 3D polyline, that will still be true.

[rkmcswain 107]

Hi all..

 

can help me how to convert 3d polyline to 2d polyline in autocad 2008?

 

thank you..

 

I just tested this lisp routine in 2015 and it worked okay. Should work fine in 2008 also.

[anniesmith 10]

You can use some of software tools available. And this video can also

[Tiger 10]

EXPLODE -> PEDIT>JOIN ?

 

If you wanna go the less fancy route without those new-finagled apps and stuff. Now, gerroff mah lawn!

[Takis Tsiberis 1]

Select the 3D Poly,

then do

Modify -> Explode

then

select all the lines

then (in the properties window)

set "Start Z" to 0.00 (that is zero)

also

set "End Z" to 0.00

finally

select all the lines

then do

Modify -> Join

[mohammad-hassan 0]

explode & join it

[ahmedasem1 0]

Thank you  . i try it it working fine

On 9/26/2020 at 8:38 PM, Takis Tsiberis said:

Select the 3D Poly,

then do

Modify -> Explode

then

select all the lines

then (in the properties window)

set "Start Z" to 0.00 (that is zero)

also

set "End Z" to 0.00

finally

select all the lines

then do

Modify -> Join

 

[BIGAL 587]

If you dont have any arcs then the simplest is get Co-ordinates, erase, then create a new pline.

[lrm 59]

@BIGAL  per AutoCAD help "A 3D polyline is a connected sequence of straight line segments created as a single object. 3D polylines can be non-coplanar; however, they cannot include arc segments."  No arcs,

 

Explode,flatten join.

or

with osnap set to end   you can use pline and pick the 3dpoly vertices in order.  Vertices of the 3dpoly that you pick will be projected to a 2D plane that is parallel to the current xy plane and that contains the first vertex you digitize. 

 

[BIGAL 587]

Yeah forgot about no arcs, would be pretty easy to add a trans so recreated in world UCS. Just strip z, looking at the link.

[Trudy 6]

Something i extract from one code.

command is 3dpto2d

Work only for Plines without ARCs

(defun LM:group-n ( l n / r )
    (if l
        (cons
            (reverse (repeat n (setq r (cons (car l) r) l (cdr l)) r))
            (LM:group-n l n)
        )
    )
)

(defun c:3dpto2d (/ listt XY)
(setq sel (ssget '((0 . "POLYLINE"))))

(repeat (setq i (sslength sel))
	(setq Vname (vlax-ename->vla-object (ssname sel (setq i (1- i)))))
	(if (equal (vlax-get Vname 'ObjectName) "AcDb3dPolyline")
		(progn
			(setq coord (vlax-get Vname 'coordinates))
			(setq listt (LM:group-n coord 3))
				(foreach x listt (setq XY (cons (list (car x) (cadr x)) XY)))
					(ENTMAKE
						(APPLY
						(FUNCTION APPEND)
						(CONS (LIST '(0 . "LWPOLYLINE")
									'(100 . "AcDbEntity")
									'(67 . 0)
									'(410 . "Model")
									(cons 8 (getvar 'clayer))
									'(100 . "AcDbPolyline")
									(CONS 90 (LENGTH XY))
									(if (= (vlax-get Vname 'Closed) 0) (cons 70 0) (cons 70 1))
								)
								(MAPCAR (FUNCTION LIST)
										(MAPCAR (FUNCTION (LAMBDA (XY) (CONS 10 XY))) XY)                     
								)
						)
						)
					)
			(setq XY nil)
		)
	)
)
(princ)
)

 

[rkmcswain 107]

27 minutes ago, Trudy said:

 

Work only for Plines without ARCs

 

 

Which is fine, since 3D polylines cannot contain arcs anyway.

[SLW210 130]

I do believe CADTOOLS.exe has 3DPline to Pline.