CURVEs on NURBS Surface

Replies to This Discussion

Permalink Reply by fernando molas garcia on February 7, 2012 at 12:35pm

something?

Attachments:

• CurveonNURBSSurface f.gh, 8 KB
• CurveonNURBSSurface f.3dm, 167 KB

Permalink Reply by M NICK on February 7, 2012 at 12:57pm

Fernando,

The problem is that for example in your definition, it gives 16 curves instead of 20!!! it always gives wrong numbers! I don't know what's the problem!

M 

Permalink Reply by M NICK on February 7, 2012 at 2:06pm

and.... the curve is not equally divided!

Permalink Reply by Chris Tietjen on February 7, 2012 at 5:18pm

Here are a couple of ideas.

Attachments:

• CurveonNURBSSurfaceRev1.gh, 13 KB

Permalink Reply by M NICK on February 8, 2012 at 10:36am

Chris, 

Again the number of curves which SubCrv gives me is different from the actual curve on the surface! for example it gives me 80 curves in which there are 20 curves!

Permalink Reply by M NICK on February 8, 2012 at 10:50am

Another question: does anyone know how you can manipulate control points of the curves on the NURBS surface?  (I mean how you can add, delete, move control points of the NURBS curves on the surface separately)

I really need any help,

Thanks

Nick

Attachments:

• Curves on NURBS.jpg, 196 KB

Permalink Reply by Chris Tietjen on February 8, 2012 at 11:49am

Any chance you can describe your overall intention with this definition?  I only ask because it gets tedious going back and expanding the details of the 'next' question when it might turn out that there's a better way to approach the problem but for the lack of an understanding of what the final intention is.

Chris

Permalink Reply by M NICK on February 8, 2012 at 4:18pm

Chris, 

I want to generate a NURBS surface and optamize it using Galapagos, for that, i need to know how to change the control point of the curves on the NURBS surface, then I can use Galapogas to generate different NURBS surface.

I hope it makes clear what I want to do and would be appreciated for your help

Permalink Reply by John Gulliford on February 8, 2012 at 5:00pm

See if this definition helps.

Attachments:

• NurbsSurface.3dm, 44 KB
• NurbsSurface.gh, 40 KB

Permalink Reply by Chris Tietjen on February 8, 2012 at 6:42pm

I realize that you'll have your own criteria for moving the points but in principle does this help?

Chris

Attachments:

• PointManipulation.gh, 6 KB
• PointManipulation.3dm, 34 KB

Permalink Reply by M NICK on February 10, 2012 at 2:39pm

Thanks Chris, 

I don't understand what is the "U" in SrfGrid comp.? I know it is the number of points in u direction, but why it does work just for some certain numbers? 

Permalink Reply by Chris Tietjen on February 10, 2012 at 2:51pm

It works for the numbers that represent the possible u count.  It also changes depending on how you pick the points.  It's one of the components that you have to play with a bit to see what it's doing.