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/* Copyright (c) 1986 Regents of the University of California */ |
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|
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/* SCCSid "$SunId$ LBL" */ |
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|
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/* |
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* octree.h - header file for routines using octrees. |
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* |
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* 7/28/85 |
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*/ |
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|
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/* |
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* An octree is expressed as an integer which is either |
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* an index to eight other nodes, the empty tree, or an index |
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* to a set of objects. If the octree has a value: |
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* |
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* > -1: it is an index to eight other nodes. |
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* |
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* -1: it is empty |
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* |
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* < -1: it is an index to a set of objects |
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*/ |
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|
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#ifndef OCTREE |
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#define OCTREE int |
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#endif |
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|
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#define EMPTY (-1) |
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|
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#define isempty(ot) ((ot) == EMPTY) |
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#define isfull(ot) ((ot) < EMPTY) |
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#define istree(ot) ((ot) > EMPTY) |
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|
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#define oseti(ot) (-(ot)-2) /* object set index */ |
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#define OCTBLKSIZ 04000 /* octree block size */ |
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#define octbi(ot) ((ot)>>11) /* octree block index */ |
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#define octti(ot) (((ot)&03777)<<3)/* octree index in block */ |
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|
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#ifndef MAXOBLK |
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#ifdef BIGMEM |
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#define MAXOBLK 32767 /* maximum octree block */ |
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#else |
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#define MAXOBLK 4095 /* maximum octree block */ |
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#endif |
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#endif |
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|
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extern OCTREE *octblock[MAXOBLK]; /* octree blocks */ |
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|
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#define octkid(ot,br) (octblock[octbi(ot)][octti(ot)+br]) |
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|
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extern OCTREE octalloc(), combine(), fullnode(); |
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|
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/* |
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* The cube structure is used to hold an octree and its cubic |
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* boundaries. |
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*/ |
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|
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typedef struct { |
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OCTREE cutree; /* the octree for this cube */ |
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FVECT cuorg; /* the cube origin */ |
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double cusize; /* the cube size */ |
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} CUBE; |
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|
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extern CUBE thescene; /* the main scene */ |
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|
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/* flags for reading and writing octrees */ |
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#define IO_CHECK 0 /* verify file type */ |
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#define IO_INFO 01 /* information header */ |
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#define IO_SCENE 02 /* objects */ |
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#define IO_TREE 04 /* octree */ |
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#define IO_FILES 010 /* object file names */ |
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#define IO_BOUNDS 020 /* octree boundary */ |
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#define IO_ALL (~0) /* everything */ |
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/* octree format identifier */ |
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#define OCTFMT "Radiance_octree" |
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/* magic number for octree files */ |
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#define MAXOBJSIZ 8 /* maximum sizeof(OBJECT) */ |
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#define OCTMAGIC ( 4 *MAXOBJSIZ+251) /* increment first value */ |
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/* octree node types */ |
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#define OT_EMPTY 0 |
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#define OT_FULL 1 |
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#define OT_TREE 2 |
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/* return values for surface functions */ |
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#define O_MISS 0 /* no intersection */ |
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#define O_HIT 1 /* intersection */ |
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#define O_IN 2 /* cube contained entirely */ |
