move nurbs control points?

How can I manipulate the control points for an existing nurbs surface (eg. a sphere) using grasshopper? I have successfully managed to extract and move the control points from a nurbs surface using the "Surface Points" thingy, but this does not seem to affect the underlying surface at all - it only creates a new set of points.

thanks.

Replies to This Discussion

Permalink Reply by taz on December 13, 2010 at 4:50pm

I think the simple answer is there's not much you can do with surface CPs yet.

If you look at the CPs from your sphere you'll see most of them are weighted. There's no GH component to create surfaces from CPs so you wouldn't even be able to directly recreate the original sphere.

As an alternative you can extract points from the surface, manipulate them and interpolate a new surface:

Permalink Reply by lundeholm on December 14, 2010 at 12:46am

Thanks for your reply. I did something similar but got bad results on closed surfaces. Meshes seems to be perfectly reconstructable though, so I guess it's just a matter of time before surfaces get properly implemented as well. Looking forward to that :)

Permalink Reply by Alex Worden on February 4, 2011 at 8:55pm

I am looking for a similar solution. I would like to be able to have a curve then offset another and manipulate the control points of the offset curve but do this all in grasshopper as opposed to moving the points manually in rhino.

Permalink Reply by Vasilis Chlorokostas on November 16, 2011 at 6:04am

Hello!

I am trying to do the exact same thing but with meshes. It still doesn't work.. you mention meshes are perfectly reconstuctable, can you please share how you are doing it?

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