<Arrow> keys, <a> and <z> to rotate the tetrahedron-studded icosahedron in all directions. (You can press 2 or 3 keys at once) Mobile: Hold "mouse" down near edges of screen, or near corners of screen for multiple axis rotation. This "Tetrahedron-Studded Icosahedron" is made by covering each triangle face of an icosahedron with a tetrahedron. The name "Tetrahedron Studded Icosahedron" is made up by me. It is not a recognized name for this polyhedron. I am unsure if it corresponds to one of the stellations of the icosahedron. https://en.wikipedia.org/wiki/Regular_icosahedron
My LEGO Tetrahedron Studded Icosahedron here: https://scratch.mit.edu/projects/1218327102/ 3D Tutorial Studio: https://scratch.mit.edu/studios/5040029/ 3D Polyhedrons / Polyhedra Studio: https://scratch.mit.edu/studios/5085215/ The height of a tetrahedron is sqrt(2/3) * Edge Length - I worked this out with pen and paper - then confirmed the calculation on Wikipedia https://en.wikipedia.org/wiki/Tetrahedron#Angles_and_distances An Icosahedron is a polyhedron with 20 triangle faces. Icosahedron vertex coordinates from Wikipedia: https://en.wikipedia.org/wiki/Regular_icosahedron Huge thanks to @TheLogFather for his "Faster Triangle Filler" https://scratch.mit.edu/projects/24828481/ 3D Rotation theory from Wikipedia: https://en.wikipedia.org/wiki/Rotation_matrix
