Orthographic projection is the arrangement of Plan, Side, Font or Back elevations on a 2 dimensional drawing. It shouldn't be confused with axonometric, which is a sketch with lines at 45 degrees to simulate a 3D view.
dimensional drawing. It shouldn't be confused with axonometric, which is a sketch with lines at 45 degrees to simulate a 3D view.
Isometric is a drawing method where horizontal lines are drawn at 30 degree instead, whilst vertical lines are always vertical. There is no vanishing point.
Perspective drawing, source:http://jhh.blogs.com/anthos/2006/01/add_windows_to_.html?cid=140620118
Orthographic projections are drawn to a vanishing point while Isometric projections are not and are also based on a 3 120 degree axis.
isometric : http://www.we-r-here.com/cad_05/tutorials/level_3/3-2.htm