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Comparing ray/src/rt/normal.c (file contents):
Revision 2.38 by greg, Sat Feb 22 02:07:29 2003 UTC vs.
Revision 2.49 by greg, Wed Jan 5 19:34:11 2005 UTC

# Line 1 | Line 1
1   #ifndef lint
2 < static const char       RCSid[] = "$Id$";
2 > static const char RCSid[] = "$Id$";
3   #endif
4   /*
5   *  normal.c - shading function for normal materials.
# Line 11 | Line 11 | static const char      RCSid[] = "$Id$";
11   *     Later changes described in delta comments.
12   */
13  
14 < /* ====================================================================
15 < * The Radiance Software License, Version 1.0
16 < *
17 < * Copyright (c) 1990 - 2002 The Regents of the University of California,
18 < * through Lawrence Berkeley National Laboratory.   All rights reserved.
19 < *
20 < * Redistribution and use in source and binary forms, with or without
21 < * modification, are permitted provided that the following conditions
22 < * are met:
23 < *
24 < * 1. Redistributions of source code must retain the above copyright
25 < *         notice, this list of conditions and the following disclaimer.
26 < *
27 < * 2. Redistributions in binary form must reproduce the above copyright
28 < *       notice, this list of conditions and the following disclaimer in
29 < *       the documentation and/or other materials provided with the
30 < *       distribution.
31 < *
32 < * 3. The end-user documentation included with the redistribution,
33 < *           if any, must include the following acknowledgment:
34 < *             "This product includes Radiance software
35 < *                 (http://radsite.lbl.gov/)
36 < *                 developed by the Lawrence Berkeley National Laboratory
37 < *               (http://www.lbl.gov/)."
38 < *       Alternately, this acknowledgment may appear in the software itself,
39 < *       if and wherever such third-party acknowledgments normally appear.
40 < *
41 < * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
42 < *       and "The Regents of the University of California" must
43 < *       not be used to endorse or promote products derived from this
44 < *       software without prior written permission. For written
45 < *       permission, please contact [email protected].
46 < *
47 < * 5. Products derived from this software may not be called "Radiance",
48 < *       nor may "Radiance" appear in their name, without prior written
49 < *       permission of Lawrence Berkeley National Laboratory.
50 < *
51 < * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
52 < * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
53 < * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
54 < * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
55 < * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
56 < * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
57 < * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
58 < * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
59 < * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
60 < * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
61 < * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 < * SUCH DAMAGE.
63 < * ====================================================================
64 < *
65 < * This software consists of voluntary contributions made by many
66 < * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
67 < * information on Lawrence Berkeley National Laboratory, please see
68 < * <http://www.lbl.gov/>.
69 < */
14 > #include "copyright.h"
15  
16   #include  "ray.h"
17 <
17 > #include  "ambient.h"
18 > #include  "source.h"
19   #include  "otypes.h"
20 <
20 > #include  "rtotypes.h"
21   #include  "random.h"
22  
23   #ifndef  MAXITER
24   #define  MAXITER        10              /* maximum # specular ray attempts */
25   #endif
26                                          /* estimate of Fresnel function */
27 < #define  FRESNE(ci)     (exp(-6.0*(ci)) - 0.00247875217)
27 > #define  FRESNE(ci)     (exp(-5.85*(ci)) - 0.00287989916)
28  
83 – static void  gaussamp();
29  
30   /*
31   *      This routine implements the isotropic Gaussian
# Line 119 | Line 64 | typedef struct {
64          double  pdot;           /* perturbed dot product */
65   }  NORMDAT;             /* normal material data */
66  
67 + static srcdirf_t dirnorm;
68 + static void gaussamp(RAY  *r, NORMDAT  *np);
69  
70 +
71   static void
72 < dirnorm(cval, np, ldir, omega)          /* compute source contribution */
73 < COLOR  cval;                    /* returned coefficient */
74 < register NORMDAT  *np;          /* material data */
75 < FVECT  ldir;                    /* light source direction */
76 < double  omega;                  /* light source size */
72 > dirnorm(                /* compute source contribution */
73 >        COLOR  cval,                    /* returned coefficient */
74 >        void  *nnp,             /* material data */
75 >        FVECT  ldir,                    /* light source direction */
76 >        double  omega                   /* light source size */
77 > )
78   {
79 +        register NORMDAT *np = nnp;
80          double  ldot;
81 <        double  ldiff;
81 >        double  lrdiff, ltdiff;
82          double  dtmp, d2;
83          FVECT  vtmp;
84          COLOR  ctmp;
# Line 141 | Line 91 | double  omega;                 /* light source size */
91                  return;         /* wrong side */
92  
93                                  /* Fresnel estimate */
94 <        ldiff = np->rdiff;
95 <        if (np->specfl & SP_PURE && (np->rspec > FTINY & ldiff > FTINY))
96 <                ldiff *= 1. - FRESNE(fabs(ldot));
94 >        lrdiff = np->rdiff;
95 >        ltdiff = np->tdiff;
96 >        if (np->specfl & SP_PURE && np->rspec > FTINY &&
97 >                        (lrdiff > FTINY) | (ltdiff > FTINY)) {
98 >                dtmp = 1. - FRESNE(fabs(ldot));
99 >                lrdiff *= dtmp;
100 >                ltdiff *= dtmp;
101 >        }
102  
103 <        if (ldot > FTINY && ldiff > FTINY) {
103 >        if (ldot > FTINY && lrdiff > FTINY) {
104                  /*
105                   *  Compute and add diffuse reflected component to returned
106                   *  color.  The diffuse reflected component will always be
107                   *  modified by the color of the material.
108                   */
109                  copycolor(ctmp, np->mcolor);
110 <                dtmp = ldot * omega * ldiff / PI;
110 >                dtmp = ldot * omega * lrdiff * (1.0/PI);
111                  scalecolor(ctmp, dtmp);
112                  addcolor(cval, ctmp);
113          }
# Line 165 | Line 120 | double  omega;                 /* light source size */
120                  dtmp = np->alpha2;
121                                                  /* + source if flat */
122                  if (np->specfl & SP_FLAT)
123 <                        dtmp += omega/(4.0*PI);
123 >                        dtmp += omega * (0.25/PI);
124                                                  /* half vector */
125                  vtmp[0] = ldir[0] - np->rp->rdir[0];
126                  vtmp[1] = ldir[1] - np->rp->rdir[1];
# Line 174 | Line 129 | double  omega;                 /* light source size */
129                  d2 *= d2;
130                  d2 = (DOT(vtmp,vtmp) - d2) / d2;
131                                                  /* gaussian */
132 <                dtmp = exp(-d2/dtmp)/(4.*PI*dtmp);
132 >                dtmp = exp(-d2/dtmp)/(4.*PI * np->pdot * dtmp);
133                                                  /* worth using? */
134                  if (dtmp > FTINY) {
135                          copycolor(ctmp, np->scolor);
136 <                        dtmp *= omega * sqrt(ldot/np->pdot);
136 >                        dtmp *= omega;
137                          scalecolor(ctmp, dtmp);
138                          addcolor(cval, ctmp);
139                  }
140          }
141 <        if (ldot < -FTINY && np->tdiff > FTINY) {
141 >        if (ldot < -FTINY && ltdiff > FTINY) {
142                  /*
143                   *  Compute diffuse transmission.
144                   */
145                  copycolor(ctmp, np->mcolor);
146 <                dtmp = -ldot * omega * np->tdiff / PI;
146 >                dtmp = -ldot * omega * ltdiff * (1.0/PI);
147                  scalecolor(ctmp, dtmp);
148                  addcolor(cval, ctmp);
149          }
# Line 198 | Line 153 | double  omega;                 /* light source size */
153                   *  is always modified by material color.
154                   */
155                                                  /* roughness + source */
156 <                dtmp = np->alpha2 + omega/PI;
156 >                dtmp = np->alpha2 + omega*(1.0/PI);
157                                                  /* gaussian */
158 <                dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp)/(PI*dtmp);
158 >                dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp) /
159 >                                        (PI*np->pdot*dtmp);
160                                                  /* worth using? */
161                  if (dtmp > FTINY) {
162                          copycolor(ctmp, np->mcolor);
163 <                        dtmp *= np->tspec * omega * sqrt(-ldot/np->pdot);
163 >                        dtmp *= np->tspec * omega;
164                          scalecolor(ctmp, dtmp);
165                          addcolor(cval, ctmp);
166                  }
# Line 212 | Line 168 | double  omega;                 /* light source size */
168   }
169  
170  
171 < int
172 < m_normal(m, r)                  /* color a ray that hit something normal */
173 < register OBJREC  *m;
174 < register RAY  *r;
171 > extern int
172 > m_normal(                       /* color a ray that hit something normal */
173 >        register OBJREC  *m,
174 >        register RAY  *r
175 > )
176   {
177          NORMDAT  nd;
178          double  fest;
# Line 237 | Line 194 | register RAY  *r;
194                          raytrans(r);
195                          return(1);
196                  }
197 +                raytexture(r, m->omod);
198                  flipsurface(r);                 /* reorient if backvis */
199 <        }
199 >        } else
200 >                raytexture(r, m->omod);
201          nd.mp = m;
202          nd.rp = r;
203                                                  /* get material color */
# Line 250 | Line 209 | register RAY  *r;
209          nd.alpha2 = m->oargs.farg[4];
210          if ((nd.alpha2 *= nd.alpha2) <= FTINY)
211                  nd.specfl |= SP_PURE;
212 <        if (r->ro != NULL && isflat(r->ro->otype))
213 <                nd.specfl |= SP_FLAT;
255 <                                                /* get modifiers */
256 <        raytexture(r, m->omod);
257 <        if (hastexture = DOT(r->pert,r->pert) > FTINY*FTINY)
212 >
213 >        if ( (hastexture = (DOT(r->pert,r->pert) > FTINY*FTINY)) ) {
214                  nd.pdot = raynormal(nd.pnorm, r);       /* perturb normal */
215 <        else {
215 >        } else {
216                  VCOPY(nd.pnorm, r->ron);
217                  nd.pdot = r->rod;
218          }
219 +        if (r->ro != NULL && isflat(r->ro->otype))
220 +                nd.specfl |= SP_FLAT;
221          if (nd.pdot < .001)
222                  nd.pdot = .001;                 /* non-zero for dirnorm() */
223          multcolor(nd.mcolor, r->pcol);          /* modify material color */
# Line 405 | Line 363 | register RAY  *r;
363  
364  
365   static void
366 < gaussamp(r, np)                 /* sample gaussian specular */
367 < RAY  *r;
368 < register NORMDAT  *np;
366 > gaussamp(                       /* sample gaussian specular */
367 >        RAY  *r,
368 >        register NORMDAT  *np
369 > )
370   {
371          RAY  sr;
372          FVECT  u, v, h;

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