[Radiance-general] Curved Longitude Lines - Raytracing Brain Teaser
David Smith
dbs176 at gmail.com
Wed Feb 18 21:04:22 PST 2009
Here's a brain teaser,
So when you stretch an image of the sky coordinate grid onto a sky dome,
then look at it in a hemispherical view, does anybody know what the
mathematical equations (sin, cos, etc. functions) for the "former
longitudes" (curved "vertical" lines) are on the projected 2D circle? Quite
an odd question, I'm thinking.
Here's an image to get you started, showing half the sky, latitude lines,
"former longitude" lines, ground, and a sun, projected onto a 2D circle:
http://auror.us/radiance/skyout.png .
--Dave
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