Two things to note:

  • The “Size” option of “Regular Solid” mesh means “Radius of the sphere through the vertices” not length.

  • The other bottom two tetrahedrons can also be obtained by rotating the tetrahedron on the x-axis by 120 and 240 degrees respectively but the normals which control the color will also be rotated.

Unlike my last attempt on Menger sponge, this time I didn’t freeze or crash Blender.

Tetrix group

Iteration group

Set color group

Okay move along, move along people, there’s nothing to see here!