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- /****************************************************************************
- * bezier.h
- *
- * This module contains all defines, typedefs, and prototypes for BEZIER.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 BEZIER_H
- #define BEZIER_H
-
-
-
- /*****************************************************************************
- * Global preprocessor defines
- ******************************************************************************/
-
- #define BICUBIC_PATCH_OBJECT (PATCH_OBJECT+DOUBLE_ILLUMINATE)
-
- #define BEZIER_INTERIOR_NODE 0
- #define BEZIER_LEAF_NODE 1
-
- #define MAX_PATCH_TYPE 4
-
-
-
-
- /*****************************************************************************
- * Global typedefs
- ******************************************************************************/
-
- 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];
- VECTOR Bounding_Sphere_Center;
- DBL Bounding_Sphere_Radius;
- DBL Flatness_Value;
- BEZIER_NODE *Node_Tree;
- };
-
-
-
- /*****************************************************************************
- * Global variables
- ******************************************************************************/
-
-
-
- /*****************************************************************************
- * Global functions
- ******************************************************************************/
-
- void Precompute_Patch_Values PARAMS((BICUBIC_PATCH *Shape));
- BICUBIC_PATCH *Create_Bicubic_Patch PARAMS((void));
- void Compute_Bicubic_Patch_BBox PARAMS((BICUBIC_PATCH *Patch));
-
-
-
- #endif
-