- The code create a box with a (0,0,0) point.
The new definition is more logical and makes it very easy to grow
the bounding box to include new points. It also simplifies much of
the logic in the constructors.
- Use ROOTVGREAT instead of VGREAT for sizing greatBox and invertedBox.
Avoids some overflow issues reported by Mattijs (thus GREAT has been
used in treeBoundBox), but might still need further revision.
- Constructor for bounding box of a single point.
- add(boundBox), add(point) ...
-> Extend box to enclose the second box or point(s).
Eg,
bb.add(pt);
vs.
bb.min() = Foam::min(bb.min(), pt);
bb.max() = Foam::max(bb.max(), pt);
Also works with other bounding boxes.
Eg,
bb.add(bb2);
// OR
bb += bb2;
vs.
bb.min() = Foam::min(bb.min(), bb2.min());
bb.max() = Foam::max(bb.max(), bb2.max());
'+=' operator allows the reduction to be used in parallel
gather/scatter operations.
A global '+' operator is not currently needed.
Note: may be useful in the future to have a 'clear()' method
that resets to a zero-sized (inverted) box.
STYLE: make many bounding box constructors explicit
