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/*
* hf.h
*
* Copyright (C) 1989, 1991, Craig E. Kolb
* All rights reserved.
*
* This software may be freely copied, modified, and redistributed
* provided that this copyright notice is preserved on all copies.
*
* You may not distribute this software, in whole or in part, as part of
* any commercial product without the express consent of the authors.
*
* There is no warranty or other guarantee of fitness of this software
* for any purpose. It is provided solely "as is".
*
* $Id$
*
* $Log$
*/
#ifndef HF_H
#define HF_H
#define ObjHfCreate(f) ObjCreate((ObjRef)HfCreate(f), HfMethods())
/*
* Any height values <= Hf_UNSET is not considered to be part of the
* height field. Any trianges containing such a vertex will not be
* rendered. This allows one to render non-square height fields.
*/
#define HF_UNSET (-1000.)
/*
* Number of datapoints in a single cell. If you've got loads of memory,
* decrease this number. The 'optimal' number is quite system-dependent,
* but something around 20 seems to work well. For systems without much
* memory, this constant should be greater than or equal to the largest
* height field which will be rendered, thus making the algorithm
* non-hierarchical.
*/
#define BESTSIZE 16
/*
* Size of triangle cache.
*/
#define CACHESIZE 6
/*
* Used to differentiate between the two triangles used to represent a cell:
* a------d
* |\ |
* | \TRI2| TRI2 == c-->d-->a-->c
* | \ |
* | \ |
* | \ |
* |TRI1 \| TRI1 == c-->a-->b-->c
* b------c
*/
#define TRI1 1
#define TRI2 2
typedef struct hfTri {
Vector v1, v2, v3, norm;
Float d;
char type;
struct hfTri *next, *prev;
} hfTri;
typedef struct {
int len;
hfTri *head, *tail;
} TriQueue;
typedef struct {
float **data; /* Altitude points */
float minz, maxz;
int size, *lsize; /* # of points/side */
int BestSize; /* "best" division size */
float iBestSize; /* inverse of above (for faster computation) */
int levels; /* log base BestSize of size */
float ***boundsmax; /* high data values at various resolutions. */
float ***boundsmin;
float *spacing;
hfTri hittri, **q; /* hit triangle and triangle cache */
int qtail, qsize; /* end and length of cache */
Float boundbox[2][3]; /* bounding box of Hf */
} Hf;
extern Hf *HfCreate();
extern int HfIntersect(), HfEnter(), HfNormal();
extern void HfBounds(), HfUV(), HfStats();
extern char *HfName();
extern Methods *HfMethods();
#endif /* HF_H */
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