Surface through points

Replies to This Discussion

Permalink Reply by Joe S. on March 21, 2011 at 4:14am

Are your points in very specific places? What kind of surface are you trying to end up with? If you have a picture or a concept of what you are aiming for it would be easier to help.

Permalink Reply by KVZ_JT on March 21, 2011 at 4:21am

The pictures are made of the physical model. 

I measured the coordinates with a equal x and y distance. if you look from the top it's a rectangular grid.

Attachments:

• DSC03619.JPG, 2.3 MB
• DSC03621.JPG, 2.4 MB
• DSC03620.JPG, 2.2 MB

Permalink Reply by David Rutten on March 21, 2011 at 5:05am

Hi Timmers,

 

you can't. Surface From Points requires a complete rectangular point grid. You only have a partial grid. There's a number of options though:

 

1) give up on surfaces and use Delaunay meshing instead.

2) use Patch to create your surface.

3) somehow invent the missing points in the grid.

 

Which one would you prefer?

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by KVZ_JT on March 21, 2011 at 5:11am

Oke thank you for your info.

I have the complete rectangular point grid but if i make a surface then there a no openings anymore.

So maybe the delaunay meshing i want to use. Can you give me more information of the meshing?

attached the complete rectangular point grid.

Attachments:

• points_v2.3dm, 283 KB

Permalink Reply by David Rutten on March 21, 2011 at 5:57am

In that case you can make a Surface From Points. The U Count number is the number of points along the U direction of the grid. In this case 30.

 

Luckily your points are already sorted, so when you window-select them they are in the right order. If this wasn't the case you'd have to sort them first, which is a pain in the butt.

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Attachments:

• points_v2_srf.ghx, 1 MB

Permalink Reply by APTX4869 on August 8, 2014 at 4:53am

Hi David,

I'm trying to make the same thing happen to a point grid but unfortunately my points are not sorted, so when i used the surfacefrompointgrid component it generates a messed-up surface. How do i sort the points in order to get the right surface? 

Thanks very much.

Attachments:

• 140808_Site.3dm, 842 KB

Permalink Reply by David Rutten on March 21, 2011 at 6:01am

Just search for Delaunay in the grasshopper search box (double click on an empty spot in the canvas to show the search box). There should be two delaunay components, one that computes the edges and one that computes the mesh. You want the latter.

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by KVZ_JT on March 21, 2011 at 6:11am

Thank you it looks good.

If I use the delaunay mesh the surface goes exactly through the points.

If I use the points through surface method the surface is nice curved but there are no openings anymore. 

Because i want to export the surface into GSA i actually need the openings and a nice curved surface.

Is that only possible if i cut some pieces out of the surface or is there any other method?

Permalink Reply by RWNB on March 21, 2011 at 6:11am

dear timmers,

maybe you should rethink your approach.
http://www.youtube.com/watch?v=cSZfDKsUEB8

I would encourage you to work with kangarro.
then you have no longer the problem with the surface.
http://www.grasshopper3d.com/group/kangaroo


good luck

Permalink Reply by KVZ_JT on March 21, 2011 at 6:21am

That is really nice!

I will have a look at Kangaroo.

Because i have not much time i prefer to work with the surface.

Do you know a good and clear tutorial? 

 

Permalink Reply by RWNB on March 21, 2011 at 6:34am

dear timmer,

i do not have a tutorial for kangaroo.
in the grasshopper forum you can find a lot of examples.
first you have to contact Daniel,
so that you get the access report for kangaroo.

Permalink Reply by KVZ_JT on March 21, 2011 at 9:45am

I think that kangaroo is suitable for cable net structures and not for shell structures.

Because they behave in a different way.

But thank you very much for your advice.