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<H1>Re: Quadtrees?</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#null,net">mud-dev#null,net</A></LI>
<LI><em>Subject</em>: Re: Quadtrees?</LI>
<LI><em>From</em>: <A HREF="mailto:coder#ibm,net">coder#ibm,net</A></LI>
<LI><em>Date</em>: Sun, 02 Mar 97 11:17:25 -0800</LI>
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<PRE>
On 28/02/97 at 06:58 AM, cg#ami-cg,GraySage.Edmonton.AB.CA (Chris Gray)
said:
>My thinking has been to use a 3D sparse array, which can contain objects
>of differing sizes, hence visibilities. I'm pretty vague on how the
>details would work, however. :-(
Sounds a little like an R*-Tree. I recently reposted an old post from
Wout's list with definitions and descriptions of quadtrees etc. For me
the beauty of an R*-Tree is that it allows very easy localised processing.
To find all locally relevant data nodes, just ascend the tree from the
current location until you find a rectangle which bounds the requested
area. Another nice point is that multiple "thematic" schema can be easily
bound within the same R*-Tree.
--
J C Lawrence Internet: claw#null,net
----------(*) Internet: coder#ibm,net
...Honourary Member of Clan McFud -- Teamer's Avenging Monolith...
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>Re: Quadtrees?</STRONG>, <EM>(continued)</EM>
<ul compact>
<LI><strong><A NAME="00025" HREF="msg00025.html">Re: Quadtrees?</A></strong>,
Carter T Shock <a href="mailto:ctso#umiacs,umd.edu">ctso#umiacs,umd.edu</a>, Sat 01 Mar 1997, 05:12 GMT
</LI>
<LI><strong><A NAME="00026" HREF="msg00026.html">Re: Quadtrees?</A></strong>,
S001GMU <a href="mailto:S001GMU#nova,wright.edu">S001GMU#nova,wright.edu</a>, Sat 01 Mar 1997, 05:38 GMT
</LI>
<LI><strong><A NAME="00030" HREF="msg00030.html">Re: Quadtrees?</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sat 01 Mar 1997, 17:34 GMT
</LI>
<LI><strong><A NAME="00034" HREF="msg00034.html">Re: Quadtrees?</A></strong>,
Carter T Shock <a href="mailto:ctso#umiacs,umd.edu">ctso#umiacs,umd.edu</a>, Sun 02 Mar 1997, 21:41 GMT
</LI>
<LI><strong><A NAME="00040" HREF="msg00040.html">Re: Quadtrees?</A></strong>,
coder <a href="mailto:coder#ibm,net">coder#ibm,net</a>, Mon 03 Mar 1997, 03:26 GMT
</LI>
<LI><strong><A NAME="00048" HREF="msg00048.html">Re: Quadtrees?</A></strong>,
coder <a href="mailto:coder#ibm,net">coder#ibm,net</a>, Tue 04 Mar 1997, 14:53 GMT
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<LI><strong><A NAME="00009" HREF="msg00009.html">Just a bit of musing</A></strong>,
Nathan Yospe <a href="mailto:yospe#hawaii,edu">yospe#hawaii,edu</a>, Thu 27 Feb 1997, 08:49 GMT
<UL>
<li><Possible follow-up(s)><br>
<LI><strong><A NAME="00010" HREF="msg00010.html">Re: Just a bit of musing</A></strong>,
Adam Wiggins <a href="mailto:nightfall#inficad,com">nightfall#inficad,com</a>, Thu 27 Feb 1997, 12:24 GMT
</LI>
<LI><strong><A NAME="00012" HREF="msg00012.html">Re: Just a bit of musing</A></strong>,
coder <a href="mailto:coder#ibm,net">coder#ibm,net</a>, Thu 27 Feb 1997, 14:20 GMT
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