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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 light-redirecting materials and |
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* their associated 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 dir_proj(); |
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static int dir_proj(); |
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VSMATERIAL direct1_vs = {dir_proj, 1}; |
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VSMATERIAL direct2_vs = {dir_proj, 2}; |
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getfunc(m, 8, 0xff, 1) ) |
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int |
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m_direct(m, r) /* shade redirected ray */ |
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register OBJREC *m; |
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register RAY *r; |
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{ |
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/* check if source ray */ |
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if (r->rsrc >= 0 && source[r->rsrc].so != r->ro) |
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return; /* got the wrong guy */ |
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return(1); /* got the wrong guy */ |
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/* compute first projection */ |
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if (m->otype == MAT_DIRECT1 || |
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(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 0)) |
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if (m->otype == MAT_DIRECT2 && |
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(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 1)) |
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redirect(m, r, 1); |
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return(1); |
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} |
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int |
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redirect(m, r, n) /* compute n'th ray redirection */ |
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OBJREC *m; |
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RAY *r; |
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{ |
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MFUNC *mf; |
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register EPNODE **va; |
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FVECT nsdir; |
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RAY nr; |
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double coef; |
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register int j; |
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/* set up function */ |
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mf = getdfunc(m); |
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setfunc(m, r); |
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/* assign direction variable */ |
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if (r->rsrc >= 0) { |
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register SRCREC *sp = source + source[r->rsrc].sa.sv.sn; |
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if (sp->sflags & SDISTANT) |
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VCOPY(nsdir, sp->sloc); |
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else { |
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for (j = 0; j < 3; j++) |
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nsdir[j] = sp->sloc[j] - r->rop[j]; |
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normalize(nsdir); |
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} |
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multv3(nsdir, nsdir, funcxf.xfm); |
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varset("DxA", '=', nsdir[0]/funcxf.sca); |
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varset("DyA", '=', nsdir[1]/funcxf.sca); |
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varset("DzA", '=', nsdir[2]/funcxf.sca); |
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} else { |
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varset("DxA", '=', 0.0); |
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varset("DyA", '=', 0.0); |
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varset("DzA", '=', 0.0); |
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} |
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/* compute coefficient */ |
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errno = 0; |
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va = mf->ep + 4*n; |
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rayvalue(&nr); |
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scalecolor(nr.rcol, coef); |
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addcolor(r->rcol, nr.rcol); |
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if (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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computerr: |
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objerror(m, WARNING, "compute error"); |
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} |
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static int |
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dir_proj(pm, o, s, n) /* compute a director's projection */ |
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MAT4 pm; |
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OBJREC *o; |
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olddot = DOT(tr.rdir, nv); |
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if (olddot <= FTINY && olddot >= -FTINY) |
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return(0); /* old dir parallels plane */ |
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tr.rmax = 0.0; |
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rayorigin(&tr, NULL, PRIMARY, 1.0); |
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if (!(*ofun[o->otype].funp)(o, &tr)) |
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return(0); /* no intersection! */ |
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m = vsmaterial(o); |
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mf = getdfunc(m); |
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setfunc(m, &tr); |
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varset("DxA", '=', 0.0); |
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varset("DyA", '=', 0.0); |
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varset("DzA", '=', 0.0); |
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errno = 0; |
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va = mf->ep + 4*n; |
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coef = evalue(va[0]); |