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How to Convert a 3D PL to a 2D PL?

ovenegas6BFTN
Enthusiast

How to Convert a 3D PL to a 2D PL?

ovenegas6BFTN
Enthusiast
Enthusiast

How to Convert a 3D PL to a 2D PL?

Have a 3D PL that I am trying to put Hidden lines, but it is telling me that it is a 3D PL.;  How to convert it to a 2D so the Hidden lines show hidden? (Line style shows hidden, but it is showing like continuious, how to show the line hidden?).

Exploded it and was able then to see the dashed lines, but when I tried to joint them dashed with the joint command then it went back to continuous looking 3D.  This is another bug with AutoCAD 2022?

Thanks in advance.

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Kent1Cooper
Consultant
Consultant

It's not a version-specific bug; 3DPolylines have never "honored" non-continuous linetypes.  EXPLODE it.  You can leave it as the resulting independent Lines, or if the original was planar and in the XY plane, JOIN them together into a lightweight Polyline.  [If it was not planar, or not in the XY plane, they'll just Join into a 3DPolyline again, so you'll want to leave them as Lines, OR if the original was planar but not in the XY plane, you can set a UCS to the plane of the Lines, and use PEDIT's Join option [not the JOIN command] to make them into a lightweight Polyline.]

Kent Cooper, AIA
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Kent1Cooper
Consultant
Consultant

Here's another thing you can do, possibly the only thing that will work with a non-planar 3DPolyline:

 

Draw an ARC starting at one end of the 3DPolyline.  Then JOIN the 3DPolyline and the Arc.  The result will be a Spline, which will show non-continuous linetypes.  BREAK or TRIM to remove the arc portion.

Kent Cooper, AIA
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ovenegas6BFTN
Enthusiast
Enthusiast

so far appears to work to some point.  The spline now can be hidden line and show the hidden dashed line graphics.  But I am afraid that at some point in the future it might begin to curve, etc, (not too familiar with splines, that is my concern).  So let me ask, how to convert it now to a continuous line or continuous pline that will keep showing the dashed lines?

Thanks again.

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cwr-pae
Mentor
Mentor

I think this only works using world ucs. Explode the 3D poly, select all the resulting lines and set their Z coordinates to "0", then use Pedit to convert one line and then join the lines to single poly. Or have someone with C3d to convert the the 3D poly to 2D poly.

Copy and paste the 3d poly(s) to a new drawing and post the drawing on the C3d forum and ask, someone will help.

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Kent1Cooper
Consultant
Consultant

@ovenegas6BFTN wrote:

....  The spline now can be hidden line and show the hidden dashed line graphics.  But I am afraid that at some point in the future it might begin to curve, etc, ....  So let me ask, how to convert it now to a continuous line or continuous pline that will keep showing the dashed lines?


Yes, the Spline version will get curvy if you Stretch or grip-edit to change the shape of it.

 

Is the 3DPolyline planar?  That is, does it lie in a flat plane, even if that is not the XY plane of the WCS or the current UCS?  If it's not planar, Exploding it into Lines or using the trick to make it into a Spline are your only options, because other-than-3D Polylines [whether "heavy" or "lightweight"] can only be planar.

 

See my earlier reply about what you can do if it is planar but not in the current XY plane.  I also find, if it's planar, and seemingly only in or parallel to the WCS XY plane, if I draw a Line attached to one end, and JOIN the 3DPolyline and the Line, the result is a regular LWPolyline, from which the added line segment is easily removed.

Kent Cooper, AIA
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jamatuseski
Enthusiast
Enthusiast

I maybe over simplifying this or missing something, but what about the command "LineType3dPlineOn" ?

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user181
Mentor
Mentor

@jamatuseski wrote:

I maybe over simplifying this or missing something, but what about the command "LineType3dPlineOn" ?


 

That is a Civil 3D command not available in Autocad. 

EESignature


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jamatuseski
Enthusiast
Enthusiast

Ah I see, bummer. Thanks for the clarification @user181 

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