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/****************************************************************************
* hfield.h
*
* This module contains all defines, typedefs, and prototypes for HFIELD.CPP.
*
* from Persistence of Vision(tm) Ray Tracer version 3.6.
* Copyright 1991-2003 Persistence of Vision Team
* Copyright 2003-2004 Persistence of Vision Raytracer Pty. Ltd.
*---------------------------------------------------------------------------
* NOTICE: This source code file is provided so that users may experiment
* with enhancements to POV-Ray and to port the software to platforms other
* than those supported by the POV-Ray developers. There are strict rules
* regarding how you are permitted to use this file. These rules are contained
* in the distribution and derivative versions licenses which should have been
* provided with this file.
*
* These licences may be found online, linked from the end-user license
* agreement that is located at http://www.povray.org/povlegal.html
*---------------------------------------------------------------------------
* This program is based on the popular DKB raytracer version 2.12.
* DKBTrace was originally written by David K. Buck.
* DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
*---------------------------------------------------------------------------
* $File: //depot/povray/3.6-release/source/hfield.h $
* $Revision: #2 $
* $Change: 2939 $
* $DateTime: 2004/07/04 13:43:26 $
* $Author: root $
* $Log$
*****************************************************************************/
#ifndef HFIELD_H
#define HFIELD_H
#include "bbox.h"
#include "boxes.h"
BEGIN_POV_NAMESPACE
/*****************************************************************************
* Global preprocessor defines
******************************************************************************/
#define HFIELD_OBJECT (BASIC_OBJECT+HIERARCHY_OK_OBJECT)
#define HF_CACHE_SIZE 16
/* Generate additional height field statistics. */
#define HFIELD_EXTRA_STATS 1
/*****************************************************************************
* Global typedefs
******************************************************************************/
typedef struct HField_Struct HFIELD;
typedef struct HField_Data_Struct HFIELD_DATA;
typedef struct HField_Block_Struct HFIELD_BLOCK;
typedef struct HField_Normal_Struct HFIELD_NORMAL;
typedef short HF_Normals[3];
typedef unsigned short HF_VAL;
struct HField_Normal_Struct
{
DBL fx, fz;
VECTOR normal;
};
struct HField_Block_Struct
{
int xmin, xmax;
int zmin, zmax;
DBL ymin, ymax;
};
struct HField_Data_Struct
{
int References;
int cache_pos;
int Normals_Height; /* Needed for Destructor */
int max_x, max_z;
HF_VAL min_y, max_y;
int block_max_x, block_max_z;
int block_width_x, block_width_z;
HF_VAL **Map;
HF_Normals **Normals;
HFIELD_NORMAL Normal_Cache[HF_CACHE_SIZE];
HFIELD_BLOCK **Block;
};
struct HField_Struct
{
OBJECT_FIELDS
VECTOR bounding_corner1;
VECTOR bounding_corner2;
HFIELD_DATA *Data;
};
/*****************************************************************************
* Global variables
******************************************************************************/
extern METHODS HField_Methods;
/*****************************************************************************
* Global functions
******************************************************************************/
HFIELD *Create_HField (void);
void Compute_HField_BBox (HFIELD *HField);
void Compute_HField (HFIELD *H_Field, IMAGE *Image);
END_POV_NAMESPACE
#endif
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