Closed mesh made of points in space

Grasshopper
1

Hi! Im trying to make a closed mesh (sphere style) with the points I created, but for some reason I am not getting to the result. Anybody knows what can be missing? I am not a frequent user of Grasshopper, I would be very grateful if somebody can help me out!

Screenshot 2023-11-15 at 15.56.18
Screenshot 2023-11-15 at 15.56.181920×1200 148 KB

FrecuenciaCardiaca5.gh (20.6 KB)

1 Like
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Can’t really work with your file as it comes in like this (and I’m missing your plug-ins):

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Is your closed mesh supposed to include or be made of all the vertices?

If not, you could grab a 3D Convex hull from the MeshEdit or make a ‘point volume’ ?

You can also internalize the points and share that file to get some quicker help

3

René,

Thanks for your answer. This a definition without plug-ins and with the other parts erased.

I tried using a 3D convex hull, but couldnt make it happen. Maybe I was using it wrong.

FrecuenciaCardiaca5.gh (10.1 KB)

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What about this?

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Made out of all the vertices. That way I can change the form depending on the length of the amplitud and the number of points I create.

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FrecuenciaCardiaca5.gh (9.5 KB)

You can probably use 3D Delaunay cell (from MeshEdit) plus “Alpha Shape” from @laurent_delrieu:
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Thanks René! And is it possible to do it without script?

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As it is ordered it is not a great complexity to recreate a mesh

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I just has to repeat first data to close the mesh on the meridian.
FrecuenciaCardiaca5.gh (12.7 KB)

2 Likes
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Awesome as always Laurent - I was about to say it seemed the alpha shape method, or the point volume method, still left a point here and there unaccounted for. Thanks. How would you close this mesh? Fragment patch on the naked opening?

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Thanks.
I will add points on the pole and make a fan. Delaunay mesh could also work. But I had no time it is time to sleep in France.

2 Likes
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Ok, kick ass - Rest up!

12

Thank you Laurent! And if I want to smoothen the new mesh, what would you recommend?

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Catmull&Clark or SubD

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Thank you very much Laurent! Very grateful! Is there any possibility that you can send me the last definition please?

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not so much change
FrecuenciaCardiaca5.gh (8.2 KB)

1 Like
16

Thank you!

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Hi Laurent
This works in ver 7 but doesnt seem to work in 8 even though I installed “normalize”.
Do you have the same problem ?
Giusseppe

18

I will have a look but I still don’t use R8 by default as I didn’t purchase it.
I also try to install ghshadernode without success. Normalize doesn’t appear.
Normalize just duplicate data ! So I change it with simple components.; I closed the mesh with Pufferfish component
FrecuenciaCardiaca5_RH8.gh (19.9 KB)

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1 Like
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Hi Laurent, I tried closing the mesh creating the polar points and using delunay (like you told me), but havent managed to close it. Is there any other way to do it?

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There are many ways
Or you extract the points from your list
Or you extract Naked Edges and you join them then use points.
I also added a middle point.
Delaunay must work if you provide a plane

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Then join mesh 

FrecuenciaCardiaca5_4.gh (20.5 KB)

You can make a fan, on middle point connected to 2 consecutive points

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FrecuenciaCardiaca5_5.gh (18.2 KB)

1 Like