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/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Routines for mirror material supporting virtual light sources |
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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 "ray.h" |
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#include "otypes.h" |
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*/ |
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int mir_proj(); |
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static int mir_proj(), mirrorproj(); |
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VSMATERIAL mirror_vs = {mir_proj, 1}; |
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int |
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m_mirror(m, r) /* shade mirrored ray */ |
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register OBJREC *m; |
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register RAY *r; |
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{ |
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COLOR mcolor; |
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RAY nr; |
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int rpure = 1; |
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register int i; |
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/* check arguments */ |
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if (m->oargs.nfargs != 3 || m->oargs.nsargs > 1) |
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/* check for substitute material */ |
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if (m->oargs.nsargs > 0 && |
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(r->rsrc < 0 || source[r->rsrc].so != r->ro)) { |
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rayshade(r, modifier(m->oargs.sarg[0])); |
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return; |
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if (!strcmp(m->oargs.sarg[0], VOIDID)) { |
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raytrans(r); |
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return(1); |
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} |
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return(rayshade(r, lastmod(objndx(m), m->oargs.sarg[0]))); |
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} |
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/* check for bad source ray */ |
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if (r->rsrc >= 0 && source[r->rsrc].so != r->ro) |
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return; |
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return(1); |
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if (r->rod < 0.) /* back is black */ |
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return; |
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return(1); |
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/* get modifiers */ |
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raytexture(r, m->omod); |
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/* assign material color */ |
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double pdot; |
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if (rayorigin(&nr, r, REFLECTED, bright(mcolor)) < 0) |
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return; |
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pdot = raynormal(pnorm, r); /* use textures */ |
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for (i = 0; i < 3; i++) |
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nr.rdir[i] = r->rdir[i] + 2.*pdot*pnorm[i]; |
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return(1); |
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if (DOT(r->pert,r->pert) > FTINY*FTINY) { |
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pdot = raynormal(pnorm, r); /* use textures */ |
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for (i = 0; i < 3; i++) |
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nr.rdir[i] = r->rdir[i] + 2.*pdot*pnorm[i]; |
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rpure = 0; |
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} |
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/* check for penetration */ |
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if (rpure || DOT(nr.rdir, r->ron) <= FTINY) |
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for (i = 0; i < 3; i++) |
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nr.rdir[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
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} |
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rayvalue(&nr); |
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multcolor(nr.rcol, mcolor); |
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addcolor(r->rcol, nr.rcol); |
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if (rpure && r->ro != NULL && isflat(r->ro->otype)) |
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r->rt = r->rot + nr.rt; |
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return(1); |
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} |
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static int |
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mir_proj(pm, o, s, n) /* compute a mirror's projection */ |
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MAT4 pm; |
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register OBJREC *o; |
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SRCREC *s; |
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int n; |
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{ |
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FVECT nv; |
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FVECT nv, sc; |
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double od; |
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register int i, j; |
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/* get surface normal and offset */ |
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od = getplaneq(nv, o); |
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/* check for behind */ |
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if (DOT(s->sloc, nv) <= (s->sflags & SDISTANT ? FTINY : od+FTINY)) |
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/* check for extreme point for behind */ |
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VCOPY(sc, s->sloc); |
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for (i = s->sflags & SFLAT ? SV : SW; i >= 0; i--) |
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if (DOT(nv, s->ss[i]) > 0.) |
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for (j = 0; j < 3; j++) |
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sc[j] += s->ss[i][j]; |
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else |
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for (j = 0; j < 3; j++) |
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sc[j] -= s->ss[i][j]; |
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if (DOT(sc, nv) <= (s->sflags & SDISTANT ? FTINY : od+FTINY)) |
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return(0); |
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/* everything OK -- compute projection */ |
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mirrorproj(pm, nv, od); |
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} |
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static int |
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mirrorproj(m, nv, offs) /* get mirror projection for surface */ |
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register MAT4 m; |
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FVECT nv; |
