SHP file export to CAD file

[aniket.bhola]

Hi everyone,

I am trying to do CAD export from civil 3d shape files (Planning and Analysis workspace).  shape file is having polygons. some of the polygons are having specified value of radius at the corner. 

After exporting the file I am getting polygons converted into simple polyline drawing entity. specified radius at corner of the polygons are being converted into the polylines only. (from radius to segmented lines)

I am attaching reference images also for shape file polygons and after cad export polygons. Is there any method to retain its original shape with radius converted into arc (export not in to segmented lines). if any specific methods to export shape files from civil 3d in which original geometry do not changed in cad export then let me know.

Thank you

-Aniket

[Pointdump]

Hi @aniket.bhola,
"...any method to retain its original shape with radius converted into arc..."?
Sorry, no way I can think of.
Dave

[chriscowgill7373]

My understanding on what can be contained within a shape file would be that you cannot include arcs.  By definition a polygon is an object made up of multiple straight line segments.  This excludes curves.  Maybe it would be possible to create object data that contained the location and radius of the curves.  And then use that information to place the arcs as required (I have no idea how you would trim the straight segments)

[aniket.bhola]

Hi @chriscowgill7373 

I am basically doing different analysis on shape file with graphics and shape file labels work. I am in need of exporting shape file to the CAD format from executed analysis. so it requires to maintain the geometry of the shape file if it contains any radius or arc. So I am finding solution other than map export to cad command;  maybe using different method of working.

Thank you

-Aniket

[chriscowgill7373]

What software does this need to go to?  You can't change the contents of a type that doesn't support that content.  Based on your statement,  SHP is probably not going to be an option.  There are lots of other formats that are more flexible between software.  Would a DXF work?

[TerryDotson]

As @chriscowgill7373 mentioned, the ShapeFile specification does not contain a provision for arc segments and almost all writers approximate the curves with a series of short chords.  The ShapeFile  PolyLineM (Type 23) and PolygonM (Type 25) types provide for a measurement value that could be used to store the arc bulge.  However, getting software developers to agree to its use would be a major undertaking.

[Pointdump]

Aniket,
One interesting possibility is command MAPCLEAN >> Simplify Objects >> Create Arcs.
Dave