Raytracing Checkerboard

I first show uniform sampling of the scene, for comparison. Then I show jittered, regular, multijittered, and two types of adaptive sampling. I discuss the techniques at the bottom of the page.

Note: no gamma-correction has been done on these images.

Sampling Type 1 sample/pixel, hat filter 4 samples/pixel, hat filter 16 samples/pixel, hat filter 16 samples/pixel, tent filter 16 samples/pixel, circle filter 256 samples/pixel, hat filter 256 samples/pixel, tent filter 256 samples/pixel, circle filter

Uniform

Jittered

Regular

Multi-Jittered
Sampling Type Depth = 2, hat filter Depth = 4, hat filter Depth = 9, hat filter Depth = 9, tent filter Depth = 9, circle filter

Adaptive 1

Adaptive 2

Discussion

Uniform sampling is again terrible. Jittering is OK, but produces some jaggies. Regular sampling produces horrible jaggies and artifacts, even at high pixel resolution. Multi-jittered is the best of the non-adaptive methods. Even at 16 samples/pixel, the images are smooth and the background is appropriately blurred.

The adaptive methods work as described in the previous page. The first method works OK for the foreground, but the background contains high-frequency noise and some artifacts due to the method's underlying regularity. The second method works much better, producing images that are almost as good as the multi-jittered images. They do contain some noise in the background, but no artifacts.