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Q: TQ3HitData's "distance" field is described for window-point
picking as "the distance from window point's location on the camera frustrum (in world space)
to the point of intersection with the picked object." Does this refer to the (center) of the
intersection of the pixel's frustrum with the hither plane, or maybe the yon plane, or could
it be the camera location?
A: TQ3HitData's "distance" field is the world space distance from the
origin of the picking ray to the intersection point. Effectively, this is the distance
from the camera to the intersection point in world coordinates.
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