[osg-users] using AABB instead of bounding sphere for intersection tests?

[Peter Amstutz]

Is there a way to use an axis-aligned bounding box (AABB) for the coarse 
bounding volume rather bounding spheres, for line segment 
intersections?  In my application my primary geometry is made up of 
terrain tiles which are naturally axis aligned and buildings which tend 
to be rectangular prisms.  In both cases, my intuition is that even the 
worst-case AABB is still going to represent a much tighter bound than 
the best-case bounding sphere, leading to unnecessary and expensive 
tests against the actual geometry.  It's not clear that simply 
reorganizing and optimizing the scene graph would help much in this 
case, since the buildings are clustered in a town such that bounding 
spheres will naturally tend to overlap, as well as extend out into the 
street.  Any ideas on how to handle this situation more efficiently?

Thanks,
- Peter
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