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luasitdown

add aabb to a aabb

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//---------------------------------------------------------------------------
// AABB3::add
//
// Add an AABB to the box

void    AABB3::add(const AABB3 &box) {

	// Expand the box as necessary.

	if (box.min.x < min.x) min.x = box.min.x;
	if (box.min.x > max.x) max.x = box.min.x;
	if (box.min.y < min.y) min.y = box.min.y;
	if (box.min.y > max.y) max.y = box.min.y;
	if (box.min.z < min.z) min.z = box.min.z;
	if (box.min.z > max.z) max.z = box.min.z;
}


should be this , maybe I was wrong. but where?
//---------------------------------------------------------------------------
// AABB3::add
//
// Add an AABB to the box

void    AABB3::add(const AABB3 &box) {

	// Expand the box as necessary.

	if (box.min.x < min.x) min.x = box.min.x;
	if (box.max.x > max.x) max.x = box.max.x;
	if (box.min.y < min.y) min.y = box.min.y;
	if (box.max.y > max.y) max.y = box.max.y;
	if (box.min.z < min.z) min.z = box.min.z;
	if (box.max.z > max.z) max.z = box.max.z;
}


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Pseudo code


UNION
Box.min = MIN(Box1.min, Box2.min)
Box.max = MAX(Box1.max, Box2.max)

INTERSECTION
Box.min = MAX(Box1.min, Box2.min)
Box.max = MIN(Box1.max, Box2.max)

where MIN(point1, point2) = Point( MIN( point1.x, point2.x ),...)
MAX(point1, point2) = Point( MAX( point1.x, point2.x ),...)

NOTE
if a component in min is less than the corresponding
component in max the intersection is empty

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