Problem making/sorting a Tetrahedron spaceframe!

Hey there!
So, I'm trying to make a tetrahedron spaceframe out of a bunch of triangles.
which I guess is moving along ok, but im kinda stuck at the moment.

MAIN PROBLEM:
I dont want every joint of the frame to form a tetrahedron.. only every second.
Currently the order in which the larger triangles are divided.. there's no order to to make a system out of it. So all the triangles are divided a bit randomly.

I've tried a bunch of approaches, but I'm currently banging my head towards the wall.
Would appreciate some help!
And since im in a little bit of a hurry.. the faster, the better!

SECONDARY PROBLEM:
When trying to offset the "top/bottom"(which is actually the centroid of the triangle divisions) of the tetrahedron, the points doesn't seem to want to follow the direction of the large/outer triangle normal.
(Quite weird really!)

Attachments:

GH1.jpg, 565 KB
MSc04_170420_3D_ROOF CONSTRUCTION.3dm, 240 KB
MSc04_170420_GH_DIAMOND GRID.gh, 33 KB

Replies to This Discussion

Permalink Reply by Brage Hult on April 20, 2017 at 8:07am

A few more pictures to describe the problem!
The last one, showing how the the larger triangles split up is random.
(thereby my problem)

Attachments:

GH2.jpg, 121 KB
GH3.jpg, 184 KB
GH4.jpg, 113 KB

Permalink Reply by Brage Hult on April 21, 2017 at 1:04am

Ok, so I ended up with a new approach!
(which seem to work really well!)

I am able to make the spaghetti work with one triangle cell, but not with multiple.

I think i've already located where it all goes haywire, but I'm not able to twist my brain enough to understand what the fix would be.

Any help would be appreciated.
RED group= where it goes wrong
Orange group= Visualizing the transformation/movement of vectors

Attachments: