What is the name of this 3D object creation technique?
This is a relatively new trend in graphical design which is known as low poly design or low polygon design. If you google &quot;low poly design&quot; you'll find plenty of tutorials on how to produce such pictures by yourself (e.g. this one). In (very) short, you take a picture, triangulate it and generates the polygons out of your the induced mesh. Clearly, this is all done by computer. (Somewhat this remembers me of the painting style named cubism.)