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- /****************************************************************************
- * atmoshp.h
- *
- * This module contains all defines, typedefs, and prototypes for ATMOSPH.C.
- *
- * from Persistence of Vision(tm) Ray Tracer
- * Copyright 1996 Persistence of Vision Team
- *---------------------------------------------------------------------------
- * 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 Team. There are strict rules under
- * which you are permitted to use this file. The rules are in the file
- * named POVLEGAL.DOC which should be distributed with this file. If
- * POVLEGAL.DOC is not available or for more info please contact the POV-Ray
- * Team Coordinator by leaving a message in CompuServe's Graphics Developer's
- * Forum. The latest version of POV-Ray may be found there as well.
- *
- * 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.
- *
- *****************************************************************************/
-
-
- #ifndef ATMOSPH_H
- #define ATMOSPH_H
-
- #include "warps.h"
-
- /*****************************************************************************
- * Global preprocessor defines
- ******************************************************************************/
-
- /* Define fog types. DMF */
-
- #define ORIG_FOG 1
- #define GROUND_MIST 2
- #define FOG_TYPES 2
-
- /* Atmospheric scattering types. [DB 11/94] */
-
- #define ISOTROPIC_SCATTERING 1
- #define MIE_HAZY_SCATTERING 2
- #define MIE_MURKY_SCATTERING 3
- #define RAYLEIGH_SCATTERING 4
- #define HENYEY_GREENSTEIN_SCATTERING 5
- #define SCATTERING_TYPES 5
-
-
- /*****************************************************************************
- * Global typedefs
- ******************************************************************************/
-
- typedef struct Atmosphere_Struct ATMOSPHERE;
- typedef struct Fog_Struct FOG;
- typedef struct Rainbow_Struct RAINBOW;
- typedef struct Skysphere_Struct SKYSPHERE;
-
- /* Atmosphere structure. [DB 11/94] */
-
- struct Atmosphere_Struct
- {
- int Type; /* Scattering type */
- int Samples; /* Number of samples to take */
- DBL Distance; /* Attenuation distance for exponential falloff */
- DBL Distance_Threshold; /* Min. allowed attenuation */
- DBL Scattering; /* Amount of scattering (lighten/darken) */
- DBL Eccentricity; /* Exponent of the Henyey-Greenstein function */
- COLOUR Colour; /* Color of atmosphere */
- int AA_Level; /* Max. aa-subdivision level */
- DBL AA_Threshold; /* Threshold for supersampling */
- DBL Jitter; /* Amount of jittering */
- };
-
-
-
- struct Fog_Struct
- {
- int Type;
- DBL Distance;
- DBL Alt;
- DBL Offset;
- COLOUR Colour;
- VECTOR Up;
- TURB *Turb;
- SNGL Turb_Depth;
- FOG *Next;
- };
-
-
-
- /* Rainbow structure. [DB 8/94] */
-
- struct Rainbow_Struct
- {
- DBL Distance;
- DBL Jitter;
- DBL Angle, Width;
- DBL Arc_Angle, Falloff_Angle, Falloff_Width;
- VECTOR Antisolar_Vector;
- VECTOR Up_Vector, Right_Vector;
- PIGMENT *Pigment;
- RAINBOW *Next;
- };
-
-
-
- /* Skysphere structure. [DB 8/94] */
-
- struct Skysphere_Struct
- {
- int Count; /* Number of pigments. */
- PIGMENT **Pigments; /* Pigment(s) to use. */
- TRANSFORM *Trans; /* Skysphere transformation. */
- };
-
-
-
- /*****************************************************************************
- * Global variables
- ******************************************************************************/
-
-
-
- /*****************************************************************************
- * Global functions
- ******************************************************************************/
-
- void Initialize_Atmosphere_Code PARAMS((void));
- void Deinitialize_Atmosphere_Code PARAMS((void));
-
- void Do_Infinite_Atmosphere PARAMS((RAY *Ray, COLOUR Colour));
- void Do_Finite_Atmosphere PARAMS((RAY *Ray, INTERSECTION *Intersection, COLOUR Colour, int Light_Source_Flag));
-
- ATMOSPHERE *Create_Atmosphere PARAMS((void));
- void *Copy_Atmosphere PARAMS((ATMOSPHERE *Atmosphere));
- void Destroy_Atmosphere PARAMS((ATMOSPHERE *Atmosphere));
-
- FOG *Create_Fog PARAMS((void));
- void *Copy_Fog PARAMS((FOG *Fog));
- void Destroy_Fog PARAMS((FOG *Fog));
-
- RAINBOW *Create_Rainbow PARAMS((void));
- void *Copy_Rainbow PARAMS((RAINBOW *Rainbow));
- void Destroy_Rainbow PARAMS((RAINBOW *Rainbow));
-
- SKYSPHERE *Create_Skysphere PARAMS((void));
- void *Copy_Skysphere PARAMS((SKYSPHERE *Skysphere));
- void Destroy_Skysphere PARAMS((SKYSPHERE *Skysphere));
- void Scale_Skysphere PARAMS((SKYSPHERE *Skysphere, VECTOR Vector));
- void Rotate_Skysphere PARAMS((SKYSPHERE *Skysphere, VECTOR Vector));
- void Translate_Skysphere PARAMS((SKYSPHERE *Skysphere, VECTOR Vector));
- void Transform_Skysphere PARAMS((SKYSPHERE *Skysphere, TRANSFORM *Trans));
-
-
-
- #endif
-