1. Global Illumination
:
noerror@hitel.net
: 2005.05.28

2. 1. Global Illumination
Direct Illumination :
Indirect Illumination :
,
2

3. Global Illumination
Technique
Radiosity
Photon Mapping
3

4. Radiosity
, ,
(no specular)
1984 ( )
4

5. Radiosity Process
Surface Substructuring
Scene patch .
Patch
,
.
5

6. Radiosity Process
Li = Lei+ BRDF(j) * Irradiance(Lj)
Li
Lei
BRDF(j) j
Lj j
BRDF : Bidirectional Reflectance Distribution
Function
6

7. Radiosity Process
Multi PASS Rendering
ray
. (1st pass)
. .
7

8. Radiosity
.
.(
patch hemicube
.. )
8 .

9. Photon Mapping
Photon :
,
,
1995
9

10. Photon Mapping
Monte-Carlo Method
, N
2 pass
Photon Map Photon
, Photon Map
10

11. Photon Mapping
Process
1
N Photon
Photon Map
. .
Photon
11

12. Photon Mapping
Process
Rusian Rulette
0.5
50%
50%
100%
(k-d Tree)
12

13. Photon Mapping
Process
2
ray traicing
photon
.
13

14. Global Illumination In Game
,
.
.
.
GI
,
14 .

15. 2. Radiosity
Radiosity
Inhouse
=> & =>
1 Direct Illumination =>
Indirect Illumination
15

16. Radiosity
ASE (vertex face
)
triangle Radiosity
16

17. Radiosity
basis
vector .
basis vector texture U,V
17

18. Radiosity
Direct Illumination
.
Indirect Illumination
18

19. /
http://digibath.com/repository/gi_demo.zip
19

20. Radiosity Using Photon Maps
http://www.cs.utah.edu/~bigler/research/photonmaps/photonmaps_g2.html
Global Illumination
http://atec.utdallas.edu/midori/Handouts/global_illumination.htm
Overview of Photon Mapping
http://www.ypoart.com/tutorials/Photon-Overview.htm
Henrik Wann Jensen (photon mapping)
http://graphics.ucsd.edu/~henrik/
20
Radiosity Texture Generator
http://www.dd.chalmers.se/~f97toed/radiosity/Report.htm