Convert curve to arc

Replies to This Discussion

Permalink Reply by David Rutten on May 15, 2012 at 3:21pm

Hi Vern,

if the curve is arc-shaped just plugging it into an Arc parameter will convert it. If not, then there's no component that fits arcs to freeform curves.

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David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Sameer Kumar on May 15, 2012 at 5:03pm

David,

I have always wanted a method to fit arcs to freeform curves. It would be great if one could control the 'resolution', i.e. number of arcs used to divide, while seeing the resulting maximum deviation and at the same time also set the continuity (G0, G1, G2) as a parameter. 

I know that this can only be solved through an iterative process. I have delibrated stepping into the world of Galapagos with this problem. Do you think it would be a good problem to explore using Galapagos? I have never used it before but would love to use this as an excuse.

Permalink Reply by taz on May 15, 2012 at 5:38pm

There was a discussion on this a while back...

http://www.grasshopper3d.com/forum/topics/convert-nurbs-curve-to-arcs

Permalink Reply by Sameer Kumar on May 15, 2012 at 5:43pm

Thanks Taz. 

Funny, it was exactly one year ago!

I am not good at coding which is why I havent attempted this myself. But I have always wondered if this was a good problem for Galapagos. 

Permalink Reply by David Rutten on May 16, 2012 at 1:48am

The Rhino _Convert command will already do this, I suppose it would be easiest to use that algorithm somehow, but I don't know whether its publicly available.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Vernon Vaden on May 16, 2012 at 7:39am

Okay, I guess for now I can just use the Function in Rhino until there is a solution for this in Grasshopper. Thanks for the input guys.

Vern

Permalink Reply by Lionel on August 19, 2013 at 7:08am

Hello David,

Is there any chance to get more information about the algorithm inside the _Convert command ? (name ? author ? code ? paper ?)

I would like to know if the function gives an optimal or optimized result and if others algorithms could give better results.

Thanks,

Lionel