Spring 2002 Research Work	Goal: Add caustics and other global illumination effects to raytracing at an interactive rate.

Update Tursday, March 21: Below are some pictures showing the results of varying the photon directions hitting the object over a cone of directions.

The Ring:

Cone: 0 degrees	Cone: 5.5 degrees	Cone: 10.9 degrees	Cone: 21.8 degrees

The Bunny:

Cone: 0 degrees	Cone: 5.5 degrees	Cone: 10.9 degrees

The Cube:

50 Grids, Cone: 0 degrees	50 Grids, Cone: 5.2 degrees	50 Grids, Cone: 10.3 degrees	50 Grids, Cone: 15.6 degrees	50 Grids, Cone: 20.6 degrees
162 Grids, Cone: 0 degrees	162 Grids, Cone: 2.7 degrees	162 Grids, Cone: 5.5 degrees	162 Grids, Cone: 8.2 degrees	162 Grids, Cone: 10.9 degrees
338 Grids, Cone: 0 degrees	338 Grids, Cone: 1.8 degrees	338 Grids, Cone: 3.7 degrees	338 Grids, Cone: 5.5 degrees	338 Grids, Cone: 7.4 degrees

The Cube again. This cube uses 578 grids. Since there were so many grids, the method I used above (max cone width being the angle to the next nearest light direction) very similar results, so I expanded the max cone width.

Cone: 0 degrees	(1x distance to nearest light), Cone: 5.6 degrees	(2x distance to nearest light), Cone: 11.2 degrees

Last Modified: Wednesday, March 20, 2002

Chris Wyman (wyman@cs.utah.edu)