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/****************************************************************************
* bezier.h
*
* This module contains all defines, typedefs, and prototypes for BEZIER.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/bezier.h $
* $Revision: #2 $
* $Change: 2939 $
* $DateTime: 2004/07/04 13:43:26 $
* $Author: root $
* $Log$
*****************************************************************************/
#ifndef BEZIER_H
#define BEZIER_H
BEGIN_POV_NAMESPACE
/*****************************************************************************
* Global preprocessor defines
******************************************************************************/
#define BICUBIC_PATCH_OBJECT (PATCH_OBJECT)
/* NK 1998 double_illuminate - removed +DOUBLE_ILLUMINATE from bicubic_patch */
#define BEZIER_INTERIOR_NODE 0
#define BEZIER_LEAF_NODE 1
#define MAX_PATCH_TYPE 2
/*****************************************************************************
* Global typedefs
******************************************************************************/
typedef DBL DISTANCES[4][4];
typedef DBL WEIGHTS[4][4];
typedef struct Bicubic_Patch_Struct BICUBIC_PATCH;
typedef struct Bezier_Node_Struct BEZIER_NODE;
typedef struct Bezier_Child_Struct BEZIER_CHILDREN;
typedef struct Bezier_Vertices_Struct BEZIER_VERTICES;
struct Bezier_Child_Struct
{
BEZIER_NODE *Children[4];
};
struct Bezier_Vertices_Struct
{
float uvbnds[4];
VECTOR Vertices[4];
};
struct Bezier_Node_Struct
{
int Node_Type; /* Is this an interior node, or a leaf */
VECTOR Center; /* Center of sphere bounding the (sub)patch */
DBL Radius_Squared; /* Radius of bounding sphere (squared) */
int Count; /* # of subpatches associated with this node */
void *Data_Ptr; /* Either pointer to vertices or pointer to children */
};
struct Bicubic_Patch_Struct
{
OBJECT_FIELDS
int Patch_Type, U_Steps, V_Steps;
VECTOR Control_Points[4][4];
UV_VECT ST[4];
VECTOR Bounding_Sphere_Center;
DBL Bounding_Sphere_Radius;
DBL Flatness_Value;
DBL accuracy;
BEZIER_NODE *Node_Tree;
WEIGHTS *Weights;
};
/*****************************************************************************
* Global variables
******************************************************************************/
/*****************************************************************************
* Global functions
******************************************************************************/
void Precompute_Patch_Values (BICUBIC_PATCH *Shape);
BICUBIC_PATCH *Create_Bicubic_Patch (void);
void Compute_Bicubic_Patch_BBox (BICUBIC_PATCH *Patch);
void beztype2_compute_normals (BICUBIC_PATCH *, VECTOR [4][4], DBL , VECTOR);
int intersect_bicubic_patch_nsk (RAY *, BICUBIC_PATCH *, ISTACK *);
void find_planes ( VECTOR, VECTOR, VECTOR, DBL *,VECTOR,DBL *);
END_POV_NAMESPACE
#endif
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