| /* |
| Copyright 2005-2010 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. |
| */ |
| |
| /* |
| * plane.c - This file contains the functions for dealing with planes. |
| * |
| * $Id: plane.cpp,v 1.1.1.1 2012/03/29 17:22:19 uid42307 Exp $ |
| */ |
| |
| #include "machine.h" |
| #include "types.h" |
| #include "macros.h" |
| #include "vector.h" |
| #include "intersect.h" |
| #include "util.h" |
| |
| #define PLANE_PRIVATE |
| #include "plane.h" |
| |
| static object_methods plane_methods = { |
| (void (*)(void *, void *))(plane_intersect), |
| (void (*)(void *, void *, void *, void *))(plane_normal), |
| plane_bbox, |
| free |
| }; |
| |
| object * newplane(void * tex, vector ctr, vector norm) { |
| plane * p; |
| |
| p=(plane *) rt_getmem(sizeof(plane)); |
| memset(p, 0, sizeof(plane)); |
| p->methods = &plane_methods; |
| |
| p->tex = (texture *)tex; |
| p->norm = norm; |
| VNorm(&p->norm); |
| p->d = -VDot(&ctr, &p->norm); |
| |
| return (object *) p; |
| } |
| |
| static int plane_bbox(void * obj, vector * min, vector * max) { |
| return 0; |
| } |
| |
| static void plane_intersect(plane * pln, ray * ry) { |
| flt t,td; |
| |
| t=-(pln->d + VDot(&pln->norm, &ry->o)); |
| td=VDot(&pln->norm, &ry->d); |
| if (td != 0.0) { |
| t /= td; |
| if (t > 0.0) |
| add_intersection(t,(object *) pln, ry); |
| } |
| } |
| |
| static void plane_normal(plane * pln, vector * pnt, ray * incident, vector * N) { |
| *N=pln->norm; |
| } |
| |