I am expert in perspective drawing. I developed many technical and geometrical procedures for one point-, two point- and three point perspective views. I am a patent holder of the first mechanical apparatus to plot perspectives (i.e. 3D models). This machine was patented in England in 1981 prior to computers. I am also the founder of the mathematical equations that plot any 3D model through the Cartesian coordinate system. These two equations can plot one, two and three point perspectives at any rotation angle. If you have any questions related to perspective projections feel free to contact me at artistroberto@gmail.com.