Picking and drill-picking don't work after rotating the globe

[emackey]

If you spin the globe to the opposite side (Australia, for example) and then come back to the US, picking and drill-picking stop working correctly.

Picking:

And also, drill-picking:

/cc @AnneWoepse

[emackey]

At least one team internally considers this high-priority.

[mramato]

This probably has the same root cause as #5402

[emackey]

git bisect says the first bad commit is a9a275f, which was merged in #5225.

This is the same commit that was identified as the cause of #5307, which was later fixed.

[emackey]

Turns out there was nothing magical about Australia that would cause Cesium to freak out just by looking at it. I was debugging this problem in the late spring, in the US, during the daytime, so, viewing Australia caused the Sun to become visible in the frame behind the Earth. The picking framebuffer got reassigned to the sun bloom post-process effect when this happened, and picking broke.