How to create this shape with Grasshopper?

[NiklasG (Niklas)]

Hello everyone,
I found this interesting post on this forum:

Spike Sphere Ceiling Lamp

A ceiling lamp that I fabricated for my bed room. [IMG_5341] [IMG_5346] [IMG_5350] The entire model was modelled with grasshopper and sliced into individual pieces in rhino. Big thanks to @Quan_Li for helping me with the model! The top part of the sphere has a flat piece with a hole that fits the lamp socket. [image] The spike sphere was 3D printed with a BambuLab P1P, PLA filament, 0.2mm layer height. I managed to print 6 of the spikes per plate, each plate taking around 5h to print. …

My question is: How do you create such a object with grasshopper? I have a basic understanding of how grasshopper works but this – I just cant figure out…

I only managed to create a dodecahedron (only by hand, not with grasshopper).
How do you make it, that every edge is a 4 sided solid with triangle endpoints? It almost looks like the multipipe-subD result with flat shading. But multipipe creates 6 sided tubes, not 4…

Here is a picture from this post:

Thank you for helping me!

[René_Corella]

Hey @NiklasG,

@NiklasG

I have a basic understanding of how grasshopper works but

LoL - same, that never changes

Here’s an idea I am sure can get streamlined a bit, but seems to get the shape ready for proper SubD’ing (based on the image you show).

The top chunk of the definition generates the dodecahedron, for fun, but you could also use yours or grab a quickie from a polyhedra plugin or something.

Hope it helps!
dodecahedron.gh (35.1 KB)

[kev.r (Kevin)]

There are a couple of grasshopper files in this thread that will create this shape:

More elegant solution to create this “spiked sphere” dodecahedron model

Hello I’ve worked on this “spiked sphere” model for the past days and managed to create the desired shape. [image] Now I’m wondering if there is a more elegant solution to create the model, with fewer operations/components. I’m a complete beginner, so I’m sincerely happy for any ideas or inputs! A quick summary of the steps I took to create the model: Create dodecahedron curves. Wrap the dodecahedron curves with rectangular pipes. Find the points where the rectangular tubes intersect, th…

Here’s another solution to give you more ideas to work with (does not use any plug-ins):

240803_dodecahedron_with_spikes.gh (25.2 KB)

-Kevin