Abstract
In many cases, fundamental problems of sunshine and natural lighting about rooms and buildings are practically solved with graphical methods using the projections of objects. In those cases, not only the works cost much labor, but figures on the way to the solution are apt to come ambiguous. The authors have studied on the mathematical representation of the projections given by form elements of objects. Here they show the functions they derived for replacement to get the equations of projection from the equations defining the elements, examples on some plane curves and their figures as results.
