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oocbuild.h
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/*
=======================================================================
Header for building out-of-core octree data structure
Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
(c) Lucerne University of Applied Sciences and Arts,
supported by the Swiss National Science Foundation (SNSF, #147053)
=======================================================================
$Id: oocbuild.h,v 2.1 2016/05/17 17:39:47 rschregle Exp $
*/
#ifndef OOC_BUILD_H
#define OOC_BUILD_H
/* Bottom-up construction of out-of-core octree in postorder traversal.
* The octree oct is assumed to be initialised with its origin (oct ->
* org), size (oct -> size), key callback (oct -> key), and its
* associated leaf file (oct -> leafFile).
* Records are read from the leafFile and assumed to be sorted in
* Z-order, which defines an octree leaf ordering. Leaves (terminal
* nodes) are constructed such that they contain <= leafMax records and
* have a maximum depth of maxDepth.
* Note that the following limits apply:
* leafMax <= OOC_OCTCNT_MAX (see oococt.h)
* maxDepth <= OOC_MORTON_BITS (see oocsort.h)
* The maxDepth limit arises from the fact that the Z-ordering has a
* limited resolution and will map node coordinates beyond a depth of
* OOC_MORTON_BITS to the same Z-index, causing nodes to be potentially
* read out of sequence and winding up in the wrong octree nodes.
* On success, the octree pointer oct is returned, with the constructed
* nodes in oct -> nodes, and the node count in oct -> numNodes. On
* failure, NULL is returned. */
OOC_Octree *OOC_Build (OOC_Octree *oct, unsigned leafMax,
unsigned maxDepth);
#endif
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