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root/radiance/ray/src/gen/illum.cal
Revision: 2.8
Committed: Sat Feb 22 02:07:23 2003 UTC (21 years, 1 month ago) by greg
Branch: MAIN
CVS Tags: rad5R4, rad5R2, rad4R2P2, rad5R0, rad5R1, rad3R7P2, rad3R7P1, rad4R2, rad4R1, rad4R0, rad3R5, rad3R6, rad3R6P1, rad3R8, rad3R9, rad4R2P1, rad5R3, HEAD
Changes since 2.7: +1 -2 lines
Log Message:
Changes and check-in for 3.5 release
Includes new source files and modifications not recorded for many years
See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release

File Contents

# Content
1 { RCSid: $Id$ }
2 {
3 Coordinate computations for mkillum output.
4
5 There are no arguments for the spherical case:
6
7 il_alt - Altitude (1 to -1) for spherical coordinates
8 il_azi - Azimuth (0 to 2*PI) for sphere
9
10 For the hemispherical case, A1-A9 are the unit vectors for the
11 hemisphere's coordinate system:
12
13 il_alth - Altitude (1 to 0) for hemispherical coordinates
14 il_azih - Azimuth (0 to 2*PI) for hemisphere
15 }
16
17 norm_rad(r) : if( r, r, r+2*PI );
18
19 il_alt = Dz;
20 il_azi = norm_rad(Atan2(Dy, Dx));
21
22 il_alth = sq(-Dx*A7-Dy*A8-Dz*A9);
23 il_azih = norm_rad(Atan2(-Dx*A4-Dy*A5-Dz*A6, -Dx*A1-Dy*A2-Dz*A3));