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This scene
---
camera {
location <20,50,-20>
look_at <0,-5,20>
}
plane {
y,0
pigment {checker color rgb 2, color rgb y}
scale 40
translate -y*20
}
light_source {
<0,0,30> color rgb 1
}
---
when rendered with AA 0.1, AA depth 1, and sampling method 2, artifacts
are displayed near the borders between white and green.
The problem is that some "thread blocks" have a noticeably different
brightness than the neighboring blocks. I actually noticed this on a
much more complex scene, and reduced it to this sample.
Increasing the depth or threshold will reduce and eventually eliminate
these errors.
...Chambers
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