When a ray passes through the plane of an axis-aligned Arb8 the boolean expression may not be evaluated properly. In the geometry file in the attachment an arb8 is subtracted from the top corner of another arb8. A ray passing in the plane of the positive space arb8 and the subtracted arb8 has the in/out points for the positive space primitive. The boolean operation is not properly performed on the out-point.
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