Kind of a naughty question for what kind of algorithms is used here?
- It is not marching cubes as this one would not draw perfect cubes together with other shapes - also, the vertices are on cube edges.
- It is not dual contouring - as that one places the vertices inside each cube.
- It is not “cubical” style as there is no relation between faces. Could be a modified version with shapes? Taking in half faces and making relations?
- May be surface nets or modified version of it? Vertices seems to be on cube corners.
Kind regards,