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Just embed a _prepared struct in the object where precomputed stuff can be
cached. Gets called once before rendering, which ends up calling the
object-specific ray_object_$type_prepare() methods per object.
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We should only consider dot products > 0 as intersected, or >= something
very close to 0 (epsilon).
As-is resulted in planes moving with camera movement along the plane normal
axis.
Also fixes plane distance to be non-negative in the current scene.
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Restoring some organizational sanity since adopting autotools.
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