| Revision: | 2.8 |
| Committed: | Sat Feb 22 02:07:23 2003 UTC (22 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 |
| # | 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)); |