2D drawing in Rhino to export to AutoCad

As per my previous post, I would very happily use Rhino for all of my 2D as well as 3D drawing.

Unfortunately AutoCad is a ‘necessary evil’ in terms of collaboration within my landscape architecture practice and with other consultants.

So I am looking to develop a robust and efficient workflow for exporting linework, hatches and blocks from Rhino to open in AutoCad.

I have been trying the various DWG/DXF export schemes and may well create a custom scheme - https://docs.mcneel.com/rhino/6/help/en-us/commands/acadschemes.htm

But my first question relates to some fundamental functionality in terms of the types of lines/curves it’s possible to create in Rhino and AutoCad.

A good/practical way to draw curved linework/shapes in AutoCad is to draw a polyline and then use ‘Convert to Arc’ to turn straight line segments into arcs.

Advantages of this approach are:

  • It creates nice simple, easily editable linework/shapes.

  • Arcs are very practical shapes to set out on site using centrepoints and string line.

  • Arcs offset to arcs. This is very good when setting out parallel linework for footpaths, roads etc. as both sides of the footpath/road will be nice simple, easily editable arcs.

Of course Rhino offers more sophisticated curve drawing and manipulation functionality, but because of these advantages and for the purpose exporting drawings to AutoCad, it makes sense to keep things as simple as possible.

I have two specific queries in relation to this:

1) What is the best way to mimic AutoCad’s ‘Convert to Arc’ function in Rhino?

2) As above, arcs offset cleanly to arcs in AutoCad. However in Rhino an extra curve point sometimes appears when offsetting an arc. Does anyone know if there is a way to avoid/resolve this?

Many thanks