Sciography is the representation of shadows and gradations of light and shade. It is used in architecture to accurately depict shadows. The document defines sciography and explains that it studies how different objects cast shadows on surfaces based on assumptions about the light source. Specifically, it assumes the light source is the sun at a 45 degree azimuth and altitude angle, with parallel light rays. It also outlines rules for how parallel and perpendicular lines will cast shadows on parallel surfaces.

1. Ar. Sahil Pahal, Assistant Professor, Faculty of Planning & Architecture, Pt.
Lakhmi Chand State University of Performing and Visual Arts, Rohtak, Haryana

2. Shadow
Lighted
Surface
Lighted
Surface
Shaded
Surface
Light
Rays

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4. SOME EXAMPLES:

5. WHY DO WE DO SCIOGRAPHY?

6. DEFINITION:
• Sciography, also spelled sciagraphy or skiagraphy (Greek: σκιά "shadow" and English:
graphy “pictorial representation"), 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 and shade.
• Architecture is one of the major professional fields that use this technique for
accurate representation of shadows.
• We can say that “the study of shade and shadow cast by different objects on plane
surfaces is called Sciography.”

7. ASSUMPTIONS/CONSIDERATIONS
1. Source of light is sun and we take the solar azimuth angle as 45° and solar altitude
angle as 45°.
2. The sun is located at left side of the observer and all the light rays coming from sun
are parallel rays.
3. Parallel lines cast parallel shadows on the parallel surface and perpendicular lines
cast shadows at an angle of 45°.
4. Shadow will continue to form whether the surface changes or not.
5. For example: If a Straight line is parallel to VP and perpendicular to HP and line is
placed near to VP, then shadow will start in HP but it will end in the VP.

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