Jholsenback: 1 revision: Reference Migration Initial Load

2012-03-15T19:08:58Z

1 revision: Reference Migration Initial Load

Jholsenback: 1 revision: Initial Load (TF)

2012-03-11T22:31:29Z

1 revision: Initial Load (TF)

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[[Category:Include Files]]
 This file only contains the sunpos() macro

{{#indexentry:sunpos}}
<code>sunpos(Year, Month, Day, Hour, Minute, Lstm, LAT, LONG)</code>: The macro returns the position of the sun, for a given date, time, and location on earth. The suns position is also globally declared as the vector <code>SolarPosition</code>. Two other declared vectors are the <code>Az</code> (Azimuth) and <code>Al</code> (Altitude), these can be useful for aligning an object (media container) with the sunlight. Assumption: in the scene north is in the +Z direction, south is -Z.
Parameters:
<ul>
<li><code>Year</code>= The year in four digits.</li>
<li><code>Month</code>= The month number (1-12).</li>
<li><code>Day</code>= The day number (1-31).</li>
<li><code>Hour</code>= The hour of day in 24 hour format (0-23).</li>
<li><code>Minute</code>= The minutes (0-59). </li>
<li><code>Lstm</code>= Meridian of your local time zone in degrees (+1 hour = +15 deg, east = positive, west = negative)</li>
<li><code>LAT</code>= Lattitude in degrees.decimal, northern hemisphere = positive, southern = negative</li>
<li><code>LONG</code>= Longitude in degrees.decimal, east = positive, west is negative</li>
</ul>

Usage:
<pre>
#include "sunpos.inc"

light_source {
//Greenwich, noon on the longest day of 2000
SunPos(2000, 6, 21, 12, 2, 0, 51.4667, 0.00)
rgb 1
}

cylinder{
<-2,0,0>,<2,0,0>,0.1
rotate <0, Az-90, Al> //align cylinder with sun
texture {...}
}
</pre>

Note: The default distance of the sun from the origin is 1e+9 units.

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Reference:Sunpos.inc - Revision history

Jholsenback: 1 revision: Reference Migration Initial Load

Jholsenback: 1 revision: Initial Load (TF)