[OT] This feels wrong (pthreads question)
smorrey at gmail.com
Mon Jan 29 15:48:45 MST 2007
By my reading of the STL container class deffinitions, I thought
std::map and std::multimap were rtrees. Am I wrong in this?
On 1/29/07, Levi Pearson <levi at cold.org> wrote:
> Steve <smorrey at gmail.com> writes:
> > Almost forgot to mention that I'm using an array of 3 "long long"s
> > to represent x,y,z.
> > My multimap based SceneGraph is indexed by the entities position.x
> > Is there anything I need to be concerned with performance wise here?
> > Thanks in advance!
> Did you miss the performance concern I mentioned just a little
> earlier? A large cluster of objects with similar X coordinates and
> widely dispersed Y and/or Z coordinates will return a bunch of
> extraneous objects that you'll have to check Y and Z coordinates for.
> You really ought to consider R-trees, as there has been extensive
> reasearch on them and they are widely used in practice for just the
> kind of thing you're doing.
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