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root/radiance/ray/src/gen/illum.cal
Revision: 1.1
Committed: Thu Aug 22 08:49:41 1991 UTC (32 years, 7 months ago) by greg
Branch: MAIN
Log Message:
Initial revision

File Contents

# Content
1 { SCCSid "$SunId$ LBL" }
2
3 {
4 Coordinate computations for mkillum output.
5
6 There are no arguments for the spherical case:
7
8 il_alt - Altitude (1 to -1) for spherical coordinates
9 il_azi - Azimuth (0 to 2*PI) for sphere
10
11 For the hemispherical case, A1-A9 are the unit vectors for the
12 hemisphere's coordinate system:
13
14 il_alth - Altitude (1 to 0) for hemispherical coordinates
15 il_azih - Azimuth (0 to 2*PI) for hemisphere
16 }
17
18 il_alt = Dz;
19 il_azi = norm_rad(atan2(Dy, Dx));
20
21 il_alth = sq(-Dx*A7-Dy*A8-Dz*A9);
22 il_azih = norm_rad(atan2(-Dx*A4-Dy*A5-Dz*A6, -Dx*A1-Dy*A2-Dz*A3));
23
24 norm_rad(r) = if( r, r, r+2*PI );