gfx/povray/triangle.h

   1 /****************************************************************************
   2 *                   triangle.h
   3 *
   4 *  This module contains all defines, typedefs, and prototypes for TRIANGLE.C.
   5 *
   6 *  from Persistence of Vision(tm) Ray Tracer
   7 *  Copyright 1996,1999 Persistence of Vision Team
   8 *---------------------------------------------------------------------------
   9 *  NOTICE: This source code file is provided so that users may experiment
  10 *  with enhancements to POV-Ray and to port the software to platforms other
  11 *  than those supported by the POV-Ray Team.  There are strict rules under
  12 *  which you are permitted to use this file.  The rules are in the file
  13 *  named POVLEGAL.DOC which should be distributed with this file.
  14 *  If POVLEGAL.DOC is not available or for more info please contact the POV-Ray
  15 *  Team Coordinator by email to team-coord@povray.org or visit us on the web at
  16 *  http://www.povray.org. The latest version of POV-Ray may be found at this site.
  17 *
  18 * This program is based on the popular DKB raytracer version 2.12.
  19 * DKBTrace was originally written by David K. Buck.
  20 * DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
  21 *
  22 *****************************************************************************/
  23
  24
  25 #ifndef TRIANGLE_H
  26 #define TRIANGLE_H
  27
  28
  29
  30 /*****************************************************************************
  31 * Global preprocessor defines
  32 ******************************************************************************/
  33
  34 #define TRIANGLE_OBJECT        (PATCH_OBJECT)
  35 #define SMOOTH_TRIANGLE_OBJECT (PATCH_OBJECT+DOUBLE_ILLUMINATE)
  36
  37
  38
  39 /*****************************************************************************
  40 * Global typedefs
  41 ******************************************************************************/
  42
  43 typedef struct Triangle_Struct TRIANGLE;
  44 typedef struct Smooth_Triangle_Struct SMOOTH_TRIANGLE;
  45
  46 struct Triangle_Struct
  47 {
  48   OBJECT_FIELDS
  49   VECTOR  Normal_Vector;
  50   DBL     Distance;
  51   unsigned int  Dominant_Axis:2;
  52   unsigned int  vAxis:2;  /* used only for smooth triangles */
  53   VECTOR  P1, P2, P3;
  54 };
  55
  56 struct Smooth_Triangle_Struct
  57 {
  58   OBJECT_FIELDS
  59   VECTOR  Normal_Vector;
  60   DBL     Distance;
  61   unsigned int  Dominant_Axis:2;
  62   unsigned int  vAxis:2;         /* used only for smooth triangles */
  63   VECTOR  P1, P2, P3;
  64   VECTOR  N1, N2, N3, Perp;
  65 };
  66
  67
  68
  69 /*****************************************************************************
  70 * Global variables
  71 ******************************************************************************/
  72
  73 extern METHODS Triangle_Methods;
  74 extern METHODS Smooth_Triangle_Methods;
  75
  76
  77
  78 /*****************************************************************************
  79 * Global functions
  80 ******************************************************************************/
  81
  82 TRIANGLE *Create_Triangle (void);
  83 SMOOTH_TRIANGLE *Create_Smooth_Triangle (void);
  84 int Compute_Triangle  (TRIANGLE *Triangle, int Smooth);
  85 void Compute_Triangle_BBox (TRIANGLE *Triangle);
  86
  87
  88
  89 #endif