@param box the box to query
@param x the X coordinate of the point to test.
@param y the Y coordinate of the point to test.
@param z the Z coordinate of the point to test.
@returns The depth of the point. Points inside the box will have a
positive depth, points outside it will have a negative depth, and points
on the surface will have a depth of zero.
@brief Return the depth of a point in a box.
@param box the box to query @param x the X coordinate of the point to test. @param y the Y coordinate of the point to test. @param z the Z coordinate of the point to test.
@returns The depth of the point. Points inside the box will have a positive depth, points outside it will have a negative depth, and points on the surface will have a depth of zero.