How to make two separate plines coplanar?

[ovenegas6BFTN]

AutoCAD 2022:  Trying to fillet two plines, but I get messages that they cannot fillet since they are not coplanar (annot joint these neither, which is another way to convert these two into only one pline).  How can I make these two coplanar so they fillet?  Thanks in advance.

[rushabhthakkar_910]

@ovenegas6BFTN, https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/Error-...

[ovenegas6BFTN]

Even with only one pline selected and the hitting Properties, like you suggest, I get "Start segment width" and "End segment width", "Vertex x, VertexY, etc, under the Geometry list, but I do not see the End x and End Y that you mention and which is shown on  your posting.  Are we using the same version?  I use at work V2022.   Or....(please advise)

[ovenegas6BFTN]

When I click my two plines, or only one, and right click Properties, then the Properties dialog that appears of my AutoCAD 2022 do not have the "End X" and neither the "End Y" options. 

Any feedback about this?

[rushabhthakkar_910]

@ovenegas6BFTN, Can you share your model..?

[imadHabash]

Would you please attache here a CAD dwg file with those two plines that you're talking about?

[Kent1Cooper]

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@ovenegas6BFTN wrote:

.... I do not see the End x and End Y ....

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[You are talking about different kinds of objects.  Their link is to a topic about LINE entities, not Polylines.]

Select the two Polylines, and in Properties, look at the Elevation slot.  It will probably say *VARIES*.  If they are at least in parallel planes, and just at different elevations, you can set that to a common value, but you will need to decide which one to match to the other.  If setting the Elevation value the same doesn't make them Filletable, they are probably not in parallel planes.

If your intention is that they both lie in the WCS XY plane, FLATTEN could do it for you.

[ovenegas6BFTN]

My property: under "Geometry", Elevations, it says 0 (zero, and still they could not filleted.   Wonder why this new difficulty, a lont time ago the old AutoCAD did not have that problem.   AutoCAD is not supposed to be a 2D drafting problem by default?  (Of course, unless you want to make it work in 3D, which no body uses AutoCAD for 3D)

[cadffm]

Nothing new, try it with another Version and you get the same result.

Your objects are drawed in different coordinate systems with different planes.

Share your sample (one dwg with both objects) and we can show you the problem.

You can also use LIST to see the difference.

[AVCPlugins]

If the two polylines really lie in different planes, then there is an obvious solution to the problem:
First: select one of the polylines and assign a coordinate system to it (_ucs _object).
Second: project the second polyline onto the XY plane of the current coordinate system.
To be honest, I don’t remember the standard AutoCAD command that projects curves onto a plane, because I constantly use the AVC Flat plugin. This command solves all the problems at once - any drawing object will be projected to XY (and not just the Z coordinate is set to zero) and the Thickness property will be set to zero.

[3wood]

Have you tried command FLATTEN?

[Kent1Cooper]

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@ovenegas6BFTN wrote:

My property: under "Geometry", Elevations, it says 0 (zero, and still they could not filleted.   ....

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They may be at very slightly different elevations, but it's rounding off the displayed values and they look the same in Properties.  Try selecting both of them, picking in the Elevation slot, and typing in 0 [zero] to force them both to be really zero.  You can also go into UNITS and set a higher length-units precision, and you may see a difference in what Properties reports.

[Washingtonn]

• ALL vertices of a (2D) pline are located in the same 2D plane and have the same elevation.
• Multiple plines can be combined only if they are in the same 2D plane (coplanar).
• The elevation of a pline is relative to the plane in which it was originally drawn / created. With this in mind, even if the plines have the same elevation setting, the plines will only fillet if both are in the same reference plane or in parallel reference planes.

Since you are seeing a “not coplanar” message, you probably are working with one or more plines created from lines having different end point elevations relative to the current UCS setting.

From the picture- the blue and green plines were drawn as plines in parallel planes and will fillet.

The red pline, originally a line, was created using the PEDIT command.  The vertical plane became the 2D X-Y plane for the resulting pline and the relative elevation (Z) direction is indicated by the red arrow.

The blue and green plines were drawn on parallel planes with the same reference UCS so they can easily be adjusted to the 2D plane. To fillet the red pline with the blue pline, reset the UCS (3-point method) where all points on each pline are in the same 2D plane, explode the plines and create one new pline before applying the fillet between segments.