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Should an AABB "contain" a point when the point is:

  • Exclusive: Only exactly inside the aabb

  • Inclusive: Inside the aabb or exactly on the sides

  • Almost: Inside the aabb or a little bit outside of the sides


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2 Answers 2

up vote 4 down vote accepted

Ultimately, it comes down to what you commonly check. To bring up a 4th alternative, I've used half-open intervals, so points belong to exactly one bounding box at a tight boundary.

bb.minX <= point.x < bb.maxX
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Inclusive, because when setting up containing boxes, if an object passes over the line it will be checked twice where your other methods would, and could easily not check a collision, or check too many and do a lot of extra work.

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