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/****************************************************************************
* prism.h
*
* This module contains all defines, typedefs, and prototypes for PRISM.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/prism.h $
* $Revision: #2 $
* $Change: 2939 $
* $DateTime: 2004/07/04 13:43:26 $
* $Author: root $
* $Log$
*****************************************************************************/
#ifndef PRISM_H
#define PRISM_H
BEGIN_POV_NAMESPACE
/*****************************************************************************
* Global preprocessor definitions
******************************************************************************/
#define PRISM_OBJECT (STURM_OK_OBJECT)
#define LINEAR_SPLINE 1
#define QUADRATIC_SPLINE 2
#define CUBIC_SPLINE 3
#define BEZIER_SPLINE 4
#define LINEAR_SWEEP 1
#define CONIC_SWEEP 2
/* Generate additional prism statistics. */
#define PRISM_EXTRA_STATS 1
/*****************************************************************************
* Global typedefs
******************************************************************************/
typedef struct Prism_Struct PRISM;
typedef struct Prism_Spline_Struct PRISM_SPLINE;
typedef struct Prism_Spline_Entry_Struct PRISM_SPLINE_ENTRY;
typedef struct Prism_Intersection_Structure PRISM_INT;
struct Prism_Intersection_Structure
{
DBL d; /* Distance of intersection point */
DBL w; /* Paramter of intersection point on n-th spline */
int n; /* Number of segment hit */
int t; /* Type of intersection: base/cap plane or segment */
};
struct Prism_Spline_Entry_Struct
{
DBL x1, y1, x2, y2; /* Min./Max. coordinates of segment */
DBL v1, u2, v2; /* Min./Max. coordinates of segment in <u,v>, u1 not needed */
UV_VECT A, B, C, D; /* Coefficients of segment */
};
struct Prism_Spline_Struct
{
int References;
PRISM_SPLINE_ENTRY *Entry;
};
struct Prism_Struct
{
OBJECT_FIELDS
int Number;
int Spline_Type; /* Spline type (linear, quadratic ...) */
int Sweep_Type; /* Sweep type (linear, conic) */
DBL Height1, Height2;
DBL x1, y1, x2, y2; /* Overall bounding rectangle of spline curve */
PRISM_SPLINE *Spline; /* Pointer to array of splines */
PRISM_INT *Intersections; /* Prism intersections list */
DBL u1, v1, u2, v2; /* Overall <u,v> bounding rectangle of spline */
};
/*****************************************************************************
* Global variables
******************************************************************************/
/*****************************************************************************
* Global functions
******************************************************************************/
PRISM *Create_Prism (void);
void Compute_Prism_BBox (PRISM *Prism);
void Compute_Prism (PRISM *Prism, UV_VECT *P);
END_POV_NAMESPACE
#endif
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