Nurbs from open mesh or points

Hi,

I ave a open mesh of a surface and the group of points that I had used to create that mesh. I need to analysed that mesh for curvature.

How can I trasform that open mesh in a nurbs? Or create a nurbs From that grup of points?

Thank You

Replies to This Discussion

Permalink Reply by djordje on November 6, 2012 at 8:05am

Hi Guido,

Is this what are you looking after:

?

Delete all components left of the "points" parameter (you will see, it is grouped in purple block) and plug in the list of your points, which you used to generate the mesh.

Attachments:

surface_curvature.gh, 7 KB
surface_curvature.3dm, 60 KB

Permalink Reply by Guido Nieri on November 6, 2012 at 9:11am

Hi djordje,

Thank you for your example, but my problem is create a surface from points or mesh in Grasshopper an then for the visualization I prefer use Rhino.

Do you know how can I do that?

Thank you

Permalink Reply by djordje on November 6, 2012 at 10:49am

Just right click on further right component in definition ("Mesh colours") and Bake it.
If you want to render your mesh, than you need Maxwell render plugin, and this plugin too:

http://www.grasshopper3d.com/group/scarab

If I recall it correctly (I read it somewhere on forum), you can not render the mesh using V-ray.

Permalink Reply by Guido Nieri on November 6, 2012 at 11:45am

Maybe  I didn't explain well...

What I have is a bunch of point (that represent a nodes of a grid shell) and a mesh built on it.

What I need is a Nurbs because I have to analyse that for curvature. So I decided to use rhino curvature analysis tool ( because I don't know other similar tools).

Thus how can I get that nurbs?

Thank you

Permalink Reply by djordje on November 6, 2012 at 12:03pm

Now I am confused.

When you say "analyse a surface for curvature", do you mean get a visual presentation of a surface curvature?
Because that is exactly what upper attached definition does.

If you want to have this visual presentation on nurbs instead of mesh, like this:

then use the file attached.

Attachments:

surface_curvature2.gh, 8 KB

Permalink Reply by Guido Nieri on November 6, 2012 at 1:35pm

Sorry if I had made you confuse...

But maybe we are on the right way... Your definition can be close to what I want but I have to ordinate my point because now it give me a crazy surface ( see fig. 02).

So how can I ordinate point to use you definition? As you can se in Fig 01 they have that strange order.

Thank you

Attachments:

01.jpg, 162 KB
02.jpg, 202 KB

Permalink Reply by djordje on November 6, 2012 at 2:55pm

Why can't you attach the .3dm file?

I am using Rhino 4, if you are using Rhino 5 then save the .3dm file in Rhino 4 format.

Permalink Reply by Michael Pryor on November 6, 2012 at 3:46pm

partition list or surface from points depending on your data structure.

Permalink Reply by Guido Nieri on November 6, 2012 at 10:44pm

Good Morning...

@ djordie

I attach the baked part that I want to change..

@ Michael

I get this point from a form finding technique so I can't change their partition list before. I have to start with that in that order and try to make it better...

Do you have any suggestions?

Permalink Reply by djordje on November 7, 2012 at 2:37am

You forgot to attach the .3dm file.

Permalink Reply by Guido Nieri on November 7, 2012 at 3:08am

Yepe Sorry

Attachments: