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Since nobody seems to have offered a reply to Albert's request
for a program to show shadows cast by buildings, may I offer a simple
suggestion?
Use any perspective drawing program. Arrange the
viewpoint to be at a large distance from the building, and in a direction
corresponding to the altitude and bearing of the sun at whatever time and date
you choose. Then any surface that is visible in your perspective drawing
will be sunlit. Any hidden areas will be in shadow. A shadow is
simply a space which the sun doesn't see.
Repeat the process for other times and dates.
But surely a sundial enthusiast would prefer to use a physical
model of the building, with a low-voltage lamp to simulate the sun and a sundial
to show the hour and declination corresponding to the sun's
direction.
John Lynes
-----Original
Message-----
From: A.Brown <[EMAIL PROTECTED]> To: sundial list <sundial@rrz.uni-koeln.de> Date: 29 December 2001 22:55 Subject: Shadow casting prog
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