Graphics, Figures & Tables ⇒ tikz 3D penrose tribar

[elultimiod]

Julien Cretel shares tikz code for a beautiful Penrose tribar:

https://texample.net/tikz/examples/esch ... -triangle/

I need to pair a closed tribar like Julien's with an open tribar, something like this:

t725.png (47.79 KiB) Viewed 2310 times

(Source: https://csg.tinkercad.com/things/ikyLWs ... 000&s=&v=1)

I lack the artistic and tikz skills to adapt Julien's code so that the tribar appears from a different angle and so "opens up". Can anyone help?

Thank you!