Not everyone can afford to purchase professional rendering software and not all projects are suitable for rendering using CAD. Hand drawing however can be time consuming, especially in the case of measured perspectives.
A more efficient way of working would be to make a basic CAD drawing, set a 3D view and use a black and white print to trace from before rendering by hand. This is known as the overlay method.
To render a CAD drawing by hand, a black and white 3D view is first created and printed. Then it is traced in pencil onto tracing or layout paper (thicker paper would require the use of a light box). Figures can be roughly sketched onto another piece of tracing paper. This piece of paper is subsequently moved underneath the original trace and figures added to it as well as details on objects and shapes.
Those who are proficient at drawing
figures may add them directly onto the original trace. The
drawing can either be be rendered straight away, traced again
and more details added or scanned and printed onto specialists
papers such as cartridge or watercolour.
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