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root/radiance/ray/src/cv/source.cal
Revision: 1.1
Committed: Thu Aug 22 08:43:46 1991 UTC (32 years, 7 months ago) by greg
Branch: MAIN
Log Message:
Initial revision

File Contents

# User Rev Content
1 greg 1.1 { SCCSid "$SunId$ LBL" }
2    
3     {
4     Source distribution coordinates (degrees).
5    
6     Theta is measured from the negative z-axis,
7     phi is measured from the positive x-axis
8     according to the right-hand rule.
9    
10     srcB_vert and srcB_horiz are angles
11     used in type B photometry.
12    
13     A1 - optional multipier
14     }
15    
16     flatcorr(v) = corr(v) / Rdot; { correction for flat sources }
17     corr(v) = if(AC-.5, A1*v, v); { multiplier correction }
18    
19     src_theta = Acos(Dz) / DEGREE; { 0-180 }
20     src_phi = norm_deg( atan2(Dy, Dx) / DEGREE ); { 0-360 }
21     { bilateral symmetry }
22     src_phi2 = tri( src_phi, 180 ); { 0-180 }
23     { quadrilateral symmetry }
24     src_phi4 = tri( src_phi, 90 ); { 0-90 }
25    
26     norm_deg(d) : if( d, d, d+360 );
27    
28     { Type B photometry coordinates }
29     srcB_vert = atan( -Dx/Dz ) / DEGREE;
30     srcB_horiz = Asin(Dy) / DEGREE;
31     { w/ bilateral symmetry }
32     srcB_horiz2 = abs( srcB_horiz );