Raggi_Thor Posted December 19, 2007 Posted December 19, 2007 In most other programs this is no problem, but in AutoCAd version 21(!) it still is Quote
SEANT Posted February 7, 2009 Posted February 7, 2009 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 Quote
SEANT Posted February 8, 2009 Posted February 8, 2009 Nice, and clever! Thanks. Now if only I could find a legitimate use for it. . . . Quote
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