| Revision: | 1.1 |
| Committed: | Sat Feb 22 02:07:21 2003 UTC (22 years, 2 months ago) by greg |
| Branch: | MAIN |
| CVS Tags: | rad5R2, rad4R2P2, rad5R0, rad5R1, rad3R7P2, rad3R7P1, rad4R2, rad4R1, rad4R0, rad3R5, rad3R6, rad3R6P1, rad3R8, rad3R9, rad4R2P1 |
| 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 | { |
| 2 | BAD fog simulation effect using a converted z-file, eg: |
| 3 | |
| 4 | pvalue -r -df -b -h `getinfo -d < scene.pic` scene.z | \ |
| 5 | pcomb -e VIS:20 -f fog.cal scene.pic - > foggy.pic |
| 6 | |
| 7 | The constant VIS must be set to the visibility distance, |
| 8 | ie. the distance at which half the contrast is lost. |
| 9 | |
| 10 | Substitute a local brightness model for fog_v to improve |
| 11 | the effect. |
| 12 | } |
| 13 | |
| 14 | dist = gi(2); { distance given by second file } |
| 15 | |
| 16 | fog_v : .5; { fog particles are uniform grey } |
| 17 | |
| 18 | prob = 1 - 2^-(dist/VIS); { probability of intercepting fog particle } |
| 19 | |
| 20 | fog(v) = prob*fog_v + (1-prob)*v; |
| 21 | |
| 22 | ro = fog(ri(1)); |
| 23 | go = fog(gi(1)); |
| 24 | bo = fog(bi(1)); |