Projection Systems And Theoretical Drawings

Theoretical drawing systems include orthographic drawings, planometric drawings, isometric or parallel drawing systems, trimetric, and perspective.

These drawing systems are very useful particularly for architects and designers. They are usually used as presentation drawings for clients. The orthographic or the planometric system of drawing is probably the easiest to understand as this is just a flat representation of an object, usually from the front and is done to a scale. See the example on page 55 of a pair of scissors, and pliers. Sometimes in these drawings, you will have tonal keys to give you the idea of plane recession, and form. The easiest way to go about producing one of these drawings is to place an object like a pair of scissors down on to a piece of paper and then draw around them. What you will have produced in this drawing is an outline of the object and that is what an orthographic projection is. To complete the drawing, observe, and draw in the rest of the detail of the object and then code it tonally or texturally accordingly.

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