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Posted

In most other programs this is no problem, but in AutoCAd version 21(!) it still is :)

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  • 1 year later...
Posted
If a circular Spline of degree 2 (order 3) were needed, and Rhino was not available, it could be generated with Autocad by jumping through some hoops.

 

For example:

 

Set SPLINETYPE system variable to 5

 

Command: _polygon Enter number of sides

proceed to make polygon (actually a Polyline) to the approximate size needed

 

Command: _pedit Select polyline or [Multiple]

select polygon Spline

 

A Quadratic (degree 2) Spline Fit 2DPolyline is generated.

 

Command: _spline

choose [Object] option and select 2DPoly

 

The poly is converted to a circular spline with 8 semi-regularly spaced Control Points. Fit Point data has been purged.

 

A _scale with [Reference] option may be needed to get the appropriate size.

 

I’m adding to this thread in case future searches on the subject are presented with imprecise information

 

The recommendation I made above – though very circle like – deviates from a constant radius by about 1%. Regular polygons with more sides would reduce the error but not eliminate it.

 

I’ve posted a .NET routine that produces a pure Nurbs circle for AutoCAD in the same fashion as those produced by Rhino and other Nurbs based modelers.

 

http://www.cadtutor.net/forum/showthread.php?t=32338

Posted
Nice, and clever! :D

 

Thanks. Now if only I could find a legitimate use for it. . . . :)

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