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greg |
1.1 |
#ifndef lint |
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greg |
2.8 |
static const char RCSid[] = "$Id$"; |
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greg |
1.1 |
#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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greg |
2.8 |
/* ==================================================================== |
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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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greg |
1.1 |
#include "ray.h" |
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#include "otypes.h" |
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#include "source.h" |
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greg |
2.2 |
#include "func.h" |
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greg |
1.1 |
/* |
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* The arguments for MAT_DIRECT1 are: |
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* |
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greg |
1.3 |
* 5+ coef1 dx1 dy1 dz1 funcfile transform.. |
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greg |
1.1 |
* 0 |
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* n A1 A2 .. An |
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* |
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* The arguments for MAT_DIRECT2 are: |
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* |
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greg |
1.3 |
* 9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform.. |
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greg |
1.1 |
* 0 |
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* n A1 A2 .. An |
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*/ |
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greg |
2.8 |
static int dir_proj(); |
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greg |
1.1 |
VSMATERIAL direct1_vs = {dir_proj, 1}; |
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VSMATERIAL direct2_vs = {dir_proj, 2}; |
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greg |
2.2 |
#define getdfunc(m) ( (m)->otype == MAT_DIRECT1 ? \ |
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getfunc(m, 4, 0xf, 1) : \ |
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getfunc(m, 8, 0xff, 1) ) |
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greg |
1.1 |
|
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greg |
1.6 |
|
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greg |
2.8 |
int |
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greg |
1.1 |
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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greg |
2.4 |
return(1); /* got the wrong guy */ |
107 |
greg |
1.1 |
/* 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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redirect(m, r, 0); |
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/* compute second projection */ |
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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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greg |
2.4 |
return(1); |
116 |
greg |
1.1 |
} |
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119 |
greg |
2.8 |
int |
120 |
greg |
1.1 |
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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int n; |
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{ |
125 |
greg |
2.2 |
MFUNC *mf; |
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register EPNODE **va; |
127 |
greg |
2.3 |
FVECT nsdir; |
128 |
greg |
1.1 |
RAY nr; |
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double coef; |
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register int j; |
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/* set up function */ |
132 |
greg |
2.2 |
mf = getdfunc(m); |
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setfunc(m, r); |
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greg |
2.3 |
/* 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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greg |
2.6 |
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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} |
154 |
greg |
1.1 |
/* compute coefficient */ |
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errno = 0; |
156 |
greg |
2.2 |
va = mf->ep + 4*n; |
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coef = evalue(va[0]); |
158 |
greg |
1.1 |
if (errno) |
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goto computerr; |
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if (coef <= FTINY || rayorigin(&nr, r, TRANS, coef) < 0) |
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return(0); |
162 |
greg |
2.2 |
va++; /* compute direction */ |
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for (j = 0; j < 3; j++) { |
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nr.rdir[j] = evalue(va[j]); |
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if (errno) |
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goto computerr; |
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} |
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if (mf->f != &unitxf) |
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multv3(nr.rdir, nr.rdir, mf->f->xfm); |
170 |
greg |
1.4 |
if (r->rox != NULL) |
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multv3(nr.rdir, nr.rdir, r->rox->f.xfm); |
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if (normalize(nr.rdir) == 0.0) |
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goto computerr; |
174 |
greg |
1.1 |
/* compute value */ |
175 |
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if (r->rsrc >= 0) |
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nr.rsrc = source[r->rsrc].sa.sv.sn; |
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rayvalue(&nr); |
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scalecolor(nr.rcol, coef); |
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addcolor(r->rcol, nr.rcol); |
180 |
greg |
2.7 |
if (r->ro != NULL && isflat(r->ro->otype)) |
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r->rt = r->rot + nr.rt; |
182 |
greg |
1.1 |
return(1); |
183 |
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computerr: |
184 |
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objerror(m, WARNING, "compute error"); |
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return(-1); |
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} |
187 |
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188 |
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189 |
greg |
2.8 |
static int |
190 |
greg |
1.1 |
dir_proj(pm, o, s, n) /* compute a director's projection */ |
191 |
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MAT4 pm; |
192 |
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OBJREC *o; |
193 |
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SRCREC *s; |
194 |
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int n; |
195 |
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{ |
196 |
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RAY tr; |
197 |
greg |
2.2 |
OBJREC *m; |
198 |
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MFUNC *mf; |
199 |
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EPNODE **va; |
200 |
greg |
1.1 |
FVECT cent, newdir, nv, h; |
201 |
greg |
2.2 |
double coef, olddot, newdot, od; |
202 |
greg |
1.1 |
register int i, j; |
203 |
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/* initialize test ray */ |
204 |
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getmaxdisk(cent, o); |
205 |
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if (s->sflags & SDISTANT) |
206 |
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for (i = 0; i < 3; i++) { |
207 |
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tr.rdir[i] = -s->sloc[i]; |
208 |
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tr.rorg[i] = cent[i] - tr.rdir[i]; |
209 |
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} |
210 |
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else { |
211 |
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for (i = 0; i < 3; i++) { |
212 |
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tr.rdir[i] = cent[i] - s->sloc[i]; |
213 |
greg |
1.2 |
tr.rorg[i] = s->sloc[i]; |
214 |
greg |
1.1 |
} |
215 |
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if (normalize(tr.rdir) == 0.0) |
216 |
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return(0); /* at source! */ |
217 |
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} |
218 |
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od = getplaneq(nv, o); |
219 |
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olddot = DOT(tr.rdir, nv); |
220 |
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if (olddot <= FTINY && olddot >= -FTINY) |
221 |
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return(0); /* old dir parallels plane */ |
222 |
greg |
2.5 |
tr.rmax = 0.0; |
223 |
greg |
1.1 |
rayorigin(&tr, NULL, PRIMARY, 1.0); |
224 |
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if (!(*ofun[o->otype].funp)(o, &tr)) |
225 |
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return(0); /* no intersection! */ |
226 |
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/* compute redirection */ |
227 |
greg |
2.2 |
m = vsmaterial(o); |
228 |
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mf = getdfunc(m); |
229 |
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setfunc(m, &tr); |
230 |
greg |
2.3 |
varset("DxA", '=', 0.0); |
231 |
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varset("DyA", '=', 0.0); |
232 |
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varset("DzA", '=', 0.0); |
233 |
greg |
1.1 |
errno = 0; |
234 |
greg |
2.2 |
va = mf->ep + 4*n; |
235 |
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coef = evalue(va[0]); |
236 |
greg |
1.1 |
if (errno) |
237 |
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goto computerr; |
238 |
greg |
2.2 |
if (coef <= FTINY) |
239 |
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return(0); /* insignificant */ |
240 |
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va++; |
241 |
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for (i = 0; i < 3; i++) { |
242 |
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newdir[i] = evalue(va[i]); |
243 |
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if (errno) |
244 |
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goto computerr; |
245 |
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} |
246 |
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if (mf->f != &unitxf) |
247 |
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multv3(newdir, newdir, mf->f->xfm); |
248 |
greg |
1.4 |
/* normalization unnecessary */ |
249 |
greg |
1.1 |
newdot = DOT(newdir, nv); |
250 |
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if (newdot <= FTINY && newdot >= -FTINY) |
251 |
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return(0); /* new dir parallels plane */ |
252 |
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/* everything OK -- compute shear */ |
253 |
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for (i = 0; i < 3; i++) |
254 |
greg |
1.4 |
h[i] = newdir[i]/newdot - tr.rdir[i]/olddot; |
255 |
greg |
1.1 |
setident4(pm); |
256 |
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for (j = 0; j < 3; j++) { |
257 |
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for (i = 0; i < 3; i++) |
258 |
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pm[i][j] += nv[i]*h[j]; |
259 |
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pm[3][j] = -od*h[j]; |
260 |
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} |
261 |
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if (newdot > 0.0 ^ olddot > 0.0) /* add mirroring */ |
262 |
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for (j = 0; j < 3; j++) { |
263 |
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for (i = 0; i < 3; i++) |
264 |
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pm[i][j] -= 2.*nv[i]*nv[j]; |
265 |
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pm[3][j] += 2.*od*nv[j]; |
266 |
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} |
267 |
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return(1); |
268 |
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computerr: |
269 |
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objerror(m, WARNING, "projection compute error"); |
270 |
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return(0); |
271 |
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} |