Sciography, also spelled sciagraphy or skiagraphy ( el, σκιά "shadow" and γράφειν graphein, "write"), is a branch of science of the
perspective dealing with the projection of shadows, or delineation of an object in perspective with its gradations of
light
Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 te ...
and
shade. One of the major professional fields that use this technique is the architectural field. In
architecture
Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and constructing building ...
it is defined as a study of shades and shadows cast by simple architectural forms on plane surfaces.
In general sciography the light source is imagined as the sun inclined at 45 degrees to both vertical plane and horizontal plane coming from left hand side. The resultant shadow is then drawn.
References
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Optical phenomena
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