Geometry of [[Point|Points]] and [[Vector]] Some aspects are simple and are just an extension of 2D geometry with a $z$ component tacked on. [[Point|Points]]: $P=(P_{x},P_{y}, P_{{z}})$ [[Vector|Vectors]]: $\vec v = \mat{v_{x}\\ v_{y}\\v_{z}}$ But things like [[3D Rotation]] are more complicated due to the need for an [[Axis]].