I have converted most of your splines into flattened polylines in the attached file. One head-on view showing the plane of the splines and the other an isometric view so you could confirm that the flattened geometry stayed on the plane. The FLATTEN command is tricky to use as it projects the object perpendicular to the viewing plane. You can use the Express Tool FLATTEN to move the spline to a flat plane but it converts the spline to a polyline in the process.
I was succesfull creating regions when I built splines using object snap from your polyline data. They should not be confused with 3DPOLYLINES or splines which may not lie on a plane. LWPOLYLINE also referred to as POLYLINES by definition lie on a flat plane. Here's the results of a LIST command on one of your splines:Īs you can see, the X coordinates of the CVs are not exactly the same but different for the 11th significant figure! AutoCAD carries approximately 15 significant figures for coordinates. I did not see that you had uploaded the file until today.
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