Kevin Harris
CS6620
Programming assignment #5
Path tracer with shadow rays
08Apr1999
Last updated 08Apr1999

Here are some of the images I have generated for the Cornell box using the direct/indirect lighting methods (with shadow rays).
Notes about the below images and timings:

• They were generated with RGB instead of spectra


• Some were generated on Sun Ultra 30s (250Mhz) and others on Sun Ultra 60s (300Mhz). I split up the work to generate all of the images very quickly using about 10 different machines (each machine did a couple of images). The difference in the clock speed of the various machines is my explanation of why some of the timings seem a little bit off compared to the rest of the timings.

depth	1 sample	4 samples	16 samples	32 samples	64 samples
1	6.99 seconds	26.76 seconds	1 minute, 44.78 seconds	2 minutes, 47.21 seconds	6 minutes, 58.94 seconds
4	20.91 seconds	1 minute, 22.37 seconds	5 minutes, 27.28 seconds	8 minutes, 30.76 seconds	21 minutes, 48.86 seconds
8	31.46 seconds	2 minutes, 3.94 seconds	8 minutes, 15.34 seconds	15 minutes, 15.75 seconds	32 minutes, 22.75 seconds
16	40.38 seconds	2 minutes, 40.13 seconds	13 minutes, 2.64 seconds	16 minutes, 56.4 seconds	56 minutes, 22.11 seconds
32	46.14 seconds	3 minutes, 5.46 seconds	17 minutes, 24.77 seconds	19 minutes, 27.75 seconds	49 minutes, 45.63 seconds