[Plib-users] <<code review>> Bounding sphere of a branch node

[Rahul C. <rah...@ya...>]

Hi Guys:

The current ssg code marks a branch node's bouding
sphere empty as and when an entity is added to the
branch or removed from it. But the bounding sphere of
the branch node really does not get updated. The
places where it does get updated are in flatten() of
ssgOptimiser or the constructor of ssgLeaf (which in
turn calls the recalcBSphere of ssgBranch).

But think about a scenario where a Branch group has a
leaf ssgRahulLeaf which is derived from ssgLeaf and
has a different constrcutor which does not invoke
recalcBSphere in it. Also imagine that the user of the
ssg API did not call flatten on the scene graph before
renedering it. Will the bounding spheres of the branch
nodes be updated in this case ?

Is this better to update the bounding sphere of a
branch node right when an entity is added to or
removed from it ?

Let me know your views.

--Rahul
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