gfx/povray/discs.h

   1 /****************************************************************************
   2 *                   discs.h
   3 *
   4 *  This module contains all defines, typedefs, and prototypes for DISCS.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 #ifndef DISCS_H
  25 #define DISCS_H
  26
  27
  28
  29 /*****************************************************************************
  30 * Global preprocessor defines
  31 ******************************************************************************/
  32
  33 #define DISC_OBJECT            (BASIC_OBJECT)
  34
  35
  36
  37 /*****************************************************************************
  38 * Global typedefs
  39 ******************************************************************************/
  40
  41 typedef struct Disc_Struct DISC;
  42
  43 struct Disc_Struct
  44 {
  45   OBJECT_FIELDS
  46   TRANSFORM *Trans; /* Transformation of a Disc object */
  47   VECTOR center;    /* Center of the disc */
  48   VECTOR normal;    /* Direction perpendicular to the disc (plane normal) */
  49   DBL d;            /* The constant part of the plane equation */
  50   DBL iradius2;     /* Distance from center to inner circle of the disc */
  51   DBL oradius2;     /* Distance from center to outer circle of the disc */
  52 };
  53
  54
  55
  56 /*****************************************************************************
  57 * Global variables
  58 ******************************************************************************/
  59
  60
  61
  62
  63 /*****************************************************************************
  64 * Global functions
  65 ******************************************************************************/
  66
  67 DISC *Create_Disc (void);
  68 void Compute_Disc (DISC *Disc);
  69
  70 #endif