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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* o_face.c - compute ray intersection with faces. |
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*/ |
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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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#include "copyright.h" |
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#include "ray.h" |
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#include "face.h" |
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#include "rtotypes.h" |
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o_face(o, r) /* compute intersection with polygonal face */ |
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OBJREC *o; |
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register RAY *r; |
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int |
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o_face( /* compute intersection with polygonal face */ |
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OBJREC *o, |
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RAY *r |
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) |
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{ |
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double rdot; /* direction . normal */ |
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double t; /* distance to intersection */ |
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FVECT pisect; /* intersection point */ |
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register FACE *f; /* face record */ |
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register int i; |
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FACE *f; /* face record */ |
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f = getface(o); |
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/* |
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* First, we find the distance to the plane containing the |
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* face. If this distance is less than zero or greater |
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* than a previous intersection, we return. Otherwise, |
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* face. If the plane is parallel to our ray, or the |
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* previous hit was better, we return. Otherwise, |
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* we determine whether in fact the ray intersects the |
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* face. The ray intersects the face if the |
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* point of intersection with the plane of the face |
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*/ |
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/* compute dist. to plane */ |
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rdot = -DOT(r->rdir, f->norm); |
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if (rdot <= FTINY && rdot >= -FTINY) /* ray parallels plane */ |
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t = FHUGE; |
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else |
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t = (DOT(r->rorg, f->norm) - f->offset) / rdot; |
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if ((rdot <= FTINY) & (rdot >= -FTINY)) /* ray parallels plane */ |
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return(0); |
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t = (DOT(r->rorg, f->norm) - f->offset) / rdot; |
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if (t <= FTINY || t >= r->rot) /* not good enough */ |
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if (rayreject(o, r, t)) /* previous hit is better? */ |
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return(0); |
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/* compute intersection */ |
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for (i = 0; i < 3; i++) |
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pisect[i] = r->rorg[i] + r->rdir[i]*t; |
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VSUM(pisect, r->rorg, r->rdir, t); |
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if (!inface(pisect, f)) /* ray intersects face? */ |
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return(0); |
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VCOPY(r->rop, pisect); |
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VCOPY(r->ron, f->norm); |
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r->rod = rdot; |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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r->uv[0] = r->uv[1] = 0.0; |
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r->rox = NULL; |
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return(1); /* hit */ |
