Descriptive Geometry What is Descriptive Geometry Descriptive geometry is the use of orthographic projections in order to solve for advanced technical data involving the spatial relationships of points,lines,planes and solid shapes. Shanghai Jiao Tong University 3Shanghai Jiao Tong University 3 Descriptive Geometry n What is Descriptive Geometry ? n Descriptive geometry is the use of orthographic projections in order to solve for advanced technical data involving the spatial relationships of points, lines, planes and solid shapes