## AutoCAD Map 3D General Discussion

*Expert Elite*
Posts: 1,935
Registered: ‎11-13-2006
Message 11 of 15 (98 Views)

# Re: trim or break a 3dpolyline at a specific z coord

07-03-2013 03:58 PM in reply to: parkr4st

parkr4st wrote:

should the first break point be 5.51,0,5.51?  Your input gives the break at 7.7405,0,7.7405 for me

Thanks

dave

That's the difference between 2006 and 2010 & up, Relative and absolute coordinates on input from the keyboard.

Murph
Supportting the troops daily.
Contributor
Posts: 15
Registered: ‎12-21-2010
Message 12 of 15 (89 Views)

# Re: trim or break a 3dpolyline at a specific z coord

07-04-2013 07:55 AM in reply to: antoniovinci

Can you provide a complete working script?  This content based on your posts does break the 3DPOLY but it breaks it at the wrong elevation.  Please provide a full script to demonstrate breaking it at elevation 5.51.

-------------------

_3DPOLY

0,0,0
10,0,10

_BREAK
_L
10,0,5.51
@

-------------------

*Expert Elite*
Posts: 1,596
Registered: ‎06-03-2011
Message 13 of 15 (79 Views)

# Re: trim or break a 3dpolyline at a specific z coord

07-04-2013 11:24 AM in reply to: User48

My fault, gentlemen, I wish to apologize for that, 'cause the point 10,0,5.51 does not belong to the line 0,0,0-10,0,10 indeed.

I don't see an easy solution, I mean without using trigonometry.

On the other hand, the _SLICE command (by Z=5.51 plane) works only with solids, not with simple lines.

Sorry again...

*Expert Elite*
Posts: 1,889
Registered: ‎12-15-2006
Message 14 of 15 (74 Views)

# Re: trim or break a 3dpolyline at a specific z coord

07-04-2013 12:20 PM in reply to: antoniovinci

Hello

Sorry for my answer, I thought that Antonio has the right solution !?

Maybe I have a "stupid/bad" solution which needs a few commands !

So a Lisp/VLisp programm will be very useful ...

Draw a SOLID (Box in fact) : Height = 5.51 - which "includes the line" ...

Explode the SOLID, so you get 3DFaces ...

Draw a Line from (.xy) at beginning (Snap=END) of your line (0,0,0)

when asking for Z; click with (Snap=NEA) at the Face (which is at Z=5.51)

then draw the line with Ortho ...

I think that the Intersection of your first line and "my" line is the point you were looking for !?

Bye, Pat

Bye, Pat

Valued Mentor
Posts: 482
Registered: ‎06-06-2010
Message 15 of 15 (66 Views)

# Re: trim or break a 3dpolyline at a specific z coord

If you were to consider third party software, MapWorks Base contains two tools to handle this.  First is 3dPoly Mark Elevations which marks all points of a specified elevation along a selection set of 3dPolylines.  Second (and most important in this case) is 3dPoly Break At Elevation which breaks a selected 3dPoly at a specified elevation along a segment (also preserves Extended Entity Data on the newly created polyline).

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