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+[{{ paag_perspective_projection.png|a) picture plane\\ b) top view (plan)\\ c) side view (elevation)\\ d) projection lines\\ s) station point\\ h) horizon line (aka eye level)}}]
+**Perspective Projection** of a point in three dimensional space onto a two dimensional plane is achieved by drawing a line from a station point to the point in the three dimensional space and finding where the line intersects with the picture plane.
+This needs to be done once for the top view and once for the side view.
+Having found the intersection with the picture plane in both views, parallels can then be extended from those intersections.
+The projection of the three dimensional point is found where those parallels intersect.
+further reading:
+  * [[wp>Perspective_(graphical)|Perspective]]