text: /*
      Copyright 2005-2014 Intel Corporation.  All Rights Reserved.
  
      This file is part of Threading Building Blocks. Threading Building Blocks is free software;
      you can redistribute it and/or modify it under the terms of the GNU General Public License
      version 2  as  published  by  the  Free Software Foundation.  Threading Building Blocks is
      distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
      implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
      See  the GNU General Public License for more details.   You should have received a copy of
      the  GNU General Public License along with Threading Building Blocks; if not, write to the
      Free Software Foundation, Inc.,  51 Franklin St,  Fifth Floor,  Boston,  MA 02110-1301 USA
  
      As a special exception,  you may use this file  as part of a free software library without
      restriction.  Specifically,  if other files instantiate templates  or use macros or inline
      functions from this file, or you compile this file and link it with other files to produce
      an executable,  this file does not by itself cause the resulting executable to be covered
      by the GNU General Public License. This exception does not however invalidate any other
      reasons why the executable file might be covered by the GNU General Public License.
  */
  
  /*
      The original source for this example is
      Copyright (c) 1994-2008 John E. Stone
      All rights reserved.
  
      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions
      are met:
      1. Redistributions of source code must retain the above copyright
         notice, this list of conditions and the following disclaimer.
      2. Redistributions in binary form must reproduce the above copyright
         notice, this list of conditions and the following disclaimer in the
         documentation and/or other materials provided with the distribution.
      3. The name of the author may not be used to endorse or promote products
         derived from this software without specific prior written permission.
  
      THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
      OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
      WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
      DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      SUCH DAMAGE.
  */
  
  /* 
   * ring.h - This file contains the defines for rings etc.
   *
   *  $Id: ring.h,v 1.2 2007-02-22 17:54:16 Exp $
   */
  
  object * newring(void * tex, vector ctr, vector norm, flt in, flt out);
  
  #ifdef RING_PRIVATE 
  typedef struct {
    unsigned int id;                      /* Unique Object serial number    */
    void * nextobj;                       /* pointer to next object in list */
    object_methods * methods;             /* this object's methods          */
    texture * tex;                        /* object texture                 */
    vector ctr;
    vector norm;
    flt inrad;
    flt outrad;
  } ring; 
  
  static int ring_bbox(void * obj, vector * min, vector * max);
  static void ring_intersect(ring *, ray *);
  static void ring_normal(ring *, vector *, ray * incident, vector *);
  #endif
  