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I have a box that is drawn around my game that I want to check collisions with. Currently my BoundingBox is made in a way that whatever is inside the box is colliding with it:

BoundingBox bb = new BoundingBox(new Vector3(position.X - 0.1f, position.Y - 0.1f, position.Z - width - 0.1f), new Vector3(position.X + width + 0.1f, position.Y + width + 0.1f, position.Z + 0.1f));

(Note: the +0.1f is added so that it doesn't cause collision when an object is touching it, only when it passed through)

What I want is the inverse. I want a BoundingBox around this box so that only objects outside of the box will cause collision.

Is there an easy way of doing this or am I supposed to make different BoundingBoxes around this existing one? Thanks

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  • \$\begingroup\$ I must be missing some subtlety here. Can't you solve this problem with the not operator? \$\endgroup\$ Commented Jan 5, 2015 at 4:23
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    \$\begingroup\$ @SethBattin The subtlety is that the possible results of an intersection test are ternary (disjoint/intersects/contains), not binary. So applying a binary not operation might not give the desired result. \$\endgroup\$ Commented Jan 6, 2015 at 3:17

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BoundingBox provides several Contains (MSDN) methods that return ContainmentType (MSDN).

To test if an object is outside your bounding box, test for ContainmentType.Disjoint.

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You need to invert the logic of the test not the box itself. The bounding box can only describe a box. Whether that is a rectangular solid in space or a rectangular hole in infinite space is up to the test performed.

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