Nurbs to polyline

[Oyvind 0]

I hope someone know the solution to my problem.

I use extracted nurbs curves as basis for creating cutting paths for CNC-cutters. The path must be 2D so I convert the nurbs to polygons. This is ok for flat surfaces, but for arcs and circles the polygon consists of hundreds or thousands of lines.

I would like to convert the nurbs curve to a polyline, witch would keep arc and circles intact. But there is no convert-to-polyline command.

[starling75 1]

I hope someone know the solution to my problem.

I use extracted nurbs curves as basis for creating cutting paths for CNC-cutters. The path must be 2D so I convert the nurbs to polygons. This is ok for flat surfaces, but for arcs and circles the polygon consists of hundreds or thousands of lines.

I would like to convert the nurbs curve to a polyline, witch would keep arc and circles intact. But there is no convert-to-polyline command.

2011 can convert NURBS into polylines.

2009 probably not.. At least I didn't find how it could be done ..

[J Lucas 1]

I do not see a command in 2011 to convert to a polyline. How is this done?

[starling75 1]

I do not see a command in 2011 to convert to a polyline. How is this done?

Sorry, you can extract planar - polyline based shapes from solid/NURBS geometry.

[Kaare Baekgaard 14]

I do not see a command in 2011 to convert to a polyline. How is this done?

Sorry, you can extract planar - polyline based shapes from solid/NURBS geometry.

Not really... If the weight of any of the vertices are different than 1, the extract planar option will output a nurbs curve, not a polyline.

What I wish for is weighted polylines, so that we can convert seamlessly between 2D and 3D without loosing information. It seems kinda strange, that it is possible to create planar geometry in 3D nurbs, that cannot be recreated with any 2D tool.

A good example of this is a cross-section of the humble egg. Easy to do with nurbs curves but quite impossible with polylines.