|  Also toueizuhou e}@, toueigahou eζ@. 
Projection Drawing: a technique used for architectural drawing. Straight lines, 
called projection lines, are drawn joining various points on a 3-dimentional object 
to a flat surface, called the projection face. The points on the projection face 
figure are connected up to make a figure, called a projection drawing. When the 
projection lines are parallel, the drawing is called a parallel projection drawing 
heikou touei-zu ½se}. When the projection lines are generated from one 
point or converge into one point, the drawing is called a perspective projection 
drawing toushi touei-zu §e}.  |