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/* Copyright (c) 1990 Regents of the University of California */ |
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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"; |
32 |
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* 4+ func datafile funcfile v0 .. transform |
33 |
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* 0 |
34 |
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* 4+ red grn blu specularity A5 .. |
35 |
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* |
36 |
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* Arguments for MAT_TFUNC are: |
37 |
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* 2+ func funcfile transform |
38 |
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* 0 |
39 |
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* 4+ red grn blu rspec trans tspec A7 .. |
40 |
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* |
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* Arguments for MAT_TDATA are: |
42 |
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* 4+ func datafile funcfile v0 .. transform |
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* 0 |
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* 4+ red grn blu rspec trans tspec A7 .. |
45 |
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* |
46 |
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* Arguments for the more general MAT_BRTDF are: |
47 |
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* 10+ rrefl grefl brefl |
48 |
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* rtrns gtrns btrns |
49 |
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* rbrtd gbrtd bbrtd |
50 |
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* funcfile transform |
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* 0 |
52 |
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* 6+ red grn blu rspec trans tspec A7 .. |
53 |
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* |
54 |
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* In addition to the normal variables available to functions, |
55 |
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* we define the following: |
56 |
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* NxP, NyP, NzP - perturbed surface normal |
57 |
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* RdotP - perturbed ray dot product |
58 |
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* CrP, CgP, CbP - perturbed material color |
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*/ |
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|
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extern double funvalue(), varvalue(); |
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extern XF funcxf; |
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|
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typedef struct { |
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OBJREC *mp; /* material pointer */ |
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RAY *pr; /* intersected ray */ |
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DATARRAY *dp; /* data array for PDATA or MDATA */ |
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DATARRAY *dp; /* data array for PDATA, MDATA or TDATA */ |
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COLOR mcolor; /* color of this material */ |
44 |
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COLOR scolor; /* color of specular component */ |
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double rspec; /* specular reflection */ |
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double rdiff; /* diffuse reflection */ |
71 |
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double trans; /* transmissivity */ |
72 |
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double tspec; /* specular transmission */ |
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double tdiff; /* diffuse transmission */ |
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FVECT pnorm; /* perturbed surface normal */ |
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double pdot; /* perturbed dot product */ |
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} BRDFDAT; /* BRDF material data */ |
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FVECT ldir; /* light source direction */ |
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double omega; /* light source size */ |
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{ |
58 |
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extern XF funcxf; |
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double ldot; |
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double dtmp; |
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COLOR ctmp; |
88 |
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FVECT ldx; |
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double pt[MAXDIM]; |
90 |
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register char **sa; |
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register int i; |
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|
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setcolor(cval, 0.0, 0.0, 0.0); |
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|
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ldot = DOT(np->pnorm, ldir); |
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|
97 |
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if (ldot < 0.0) |
97 |
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if (ldot <= FTINY && ldot >= -FTINY) |
98 |
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return; /* too close to grazing */ |
99 |
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if (ldot < 0.0 ? np->trans <= FTINY : np->trans >= 1.0-FTINY) |
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return; /* wrong side */ |
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|
102 |
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if (np->rdiff > FTINY) { |
102 |
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if (ldot > 0.0 && np->rdiff > FTINY) { |
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/* |
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* Compute and add diffuse reflected component to returned |
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* color. The diffuse reflected component will always be |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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if (np->rspec > FTINY) { |
113 |
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if (ldot < 0.0 && np->tdiff > FTINY) { |
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/* |
115 |
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* Compute specular component. |
115 |
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* Diffuse transmitted component. |
116 |
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*/ |
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setfunc(np->mp, np->pr); |
118 |
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/* transform light vector */ |
119 |
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multv3(ldx, ldir, funcxf.xfm); |
120 |
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for (i = 0; i < 3; i++) |
92 |
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ldx[i] /= funcxf.sca; |
93 |
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/* evaluate BRDF */ |
94 |
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errno = 0; |
95 |
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if (np->dp == NULL) |
96 |
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dtmp = funvalue(np->mp->oargs.sarg[0], 3, ldx); |
97 |
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else { |
98 |
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for (i = 0; i < np->dp->nd; i++) |
99 |
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pt[i] = funvalue(np->mp->oargs.sarg[3+i], |
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3, ldx); |
101 |
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dtmp = datavalue(np->dp, pt); |
102 |
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dtmp = funvalue(np->mp->oargs.sarg[0], 1, &dtmp); |
103 |
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} |
104 |
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if (errno) |
105 |
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goto computerr; |
106 |
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if (dtmp > FTINY) { |
107 |
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copycolor(ctmp, np->scolor); |
108 |
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dtmp *= ldot * omega; |
109 |
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scalecolor(ctmp, dtmp); |
110 |
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addcolor(cval, ctmp); |
111 |
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} |
117 |
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copycolor(ctmp, np->mcolor); |
118 |
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dtmp = -ldot * omega * np->tdiff / PI; |
119 |
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scalecolor(ctmp, dtmp); |
120 |
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addcolor(cval, ctmp); |
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} |
122 |
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if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
123 |
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return; /* no specular component */ |
124 |
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/* set up function */ |
125 |
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setbrdfunc(np); |
126 |
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sa = np->mp->oargs.sarg; |
127 |
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errno = 0; |
128 |
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/* transform light vector */ |
129 |
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multv3(ldx, ldir, funcxf.xfm); |
130 |
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for (i = 0; i < 3; i++) |
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ldx[i] /= funcxf.sca; |
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/* compute BRTDF */ |
133 |
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if (np->mp->otype == MAT_BRTDF) { |
134 |
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colval(ctmp,RED) = funvalue(sa[6], 3, ldx); |
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if (!strcmp(sa[7],sa[6])) |
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colval(ctmp,GRN) = colval(ctmp,RED); |
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else |
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colval(ctmp,GRN) = funvalue(sa[7], 3, ldx); |
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if (!strcmp(sa[8],sa[6])) |
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colval(ctmp,BLU) = colval(ctmp,RED); |
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else if (!strcmp(sa[8],sa[7])) |
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colval(ctmp,BLU) = colval(ctmp,GRN); |
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else |
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colval(ctmp,BLU) = funvalue(sa[8], 3, ldx); |
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dtmp = bright(ctmp); |
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} else if (np->dp == NULL) { |
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dtmp = funvalue(sa[0], 3, ldx); |
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setcolor(ctmp, dtmp, dtmp, dtmp); |
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} else { |
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for (i = 0; i < np->dp->nd; i++) |
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pt[i] = funvalue(sa[3+i], 3, ldx); |
152 |
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dtmp = datavalue(np->dp, pt); |
153 |
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dtmp = funvalue(sa[0], 1, &dtmp); |
154 |
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setcolor(ctmp, dtmp, dtmp, dtmp); |
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} |
156 |
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if (errno) |
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goto computerr; |
158 |
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if (dtmp <= FTINY) |
159 |
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return; |
160 |
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if (ldot > 0.0) { |
161 |
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/* |
162 |
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* Compute reflected non-diffuse component. |
163 |
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*/ |
164 |
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if (np->mp->otype == MAT_MFUNC || np->mp->otype == MAT_MDATA) |
165 |
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multcolor(ctmp, np->mcolor); |
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dtmp = ldot * omega * np->rspec; |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} else { |
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/* |
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* Compute transmitted non-diffuse component. |
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*/ |
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if (np->mp->otype == MAT_TFUNC || np->mp->otype == MAT_TDATA) |
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multcolor(ctmp, np->mcolor); |
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dtmp = -ldot * omega * np->tspec; |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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return; |
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computerr: |
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objerror(np->mp, WARNING, "compute error"); |
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register OBJREC *m; |
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register RAY *r; |
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{ |
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int minsa, minfa; |
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BRDFDAT nd; |
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double transtest, transdist; |
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COLOR ctmp; |
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double dtmp, tspect, rspecr; |
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register int i; |
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|
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if (m->oargs.nsargs < 2 || m->oargs.nfargs < 4) |
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/* check arguments */ |
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switch (m->otype) { |
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case MAT_PFUNC: case MAT_MFUNC: |
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minsa = 2; minfa = 4; break; |
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case MAT_PDATA: case MAT_MDATA: |
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minsa = 4; minfa = 4; break; |
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case MAT_TFUNC: |
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minsa = 2; minfa = 6; break; |
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case MAT_TDATA: |
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minsa = 4; minfa = 6; break; |
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case MAT_BRTDF: |
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minsa = 10; minfa = 6; break; |
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} |
209 |
> |
if (m->oargs.nsargs < minsa || m->oargs.nfargs < minfa) |
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objerror(m, USER, "bad # arguments"); |
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/* easy shadow test */ |
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if (r->crtype & SHADOW) |
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return; |
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nd.mp = m; |
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nd.pr = r; |
213 |
< |
/* load auxiliary files */ |
214 |
< |
if (m->otype == MAT_PDATA || m->otype == MAT_MDATA) { |
215 |
< |
nd.dp = getdata(m->oargs.sarg[1]); |
216 |
< |
for (i = 3; i < m->oargs.nsargs; i++) |
217 |
< |
if (m->oargs.sarg[i][0] == '-') |
218 |
< |
break; |
219 |
< |
if (i-3 != nd.dp->nd) |
220 |
< |
objerror(m, USER, "dimension error"); |
221 |
< |
if (!fundefined(m->oargs.sarg[3])) |
222 |
< |
loadfunc(m->oargs.sarg[2]); |
223 |
< |
} else { |
224 |
< |
nd.dp = NULL; |
225 |
< |
if (!fundefined(m->oargs.sarg[0])) |
226 |
< |
loadfunc(m->oargs.sarg[1]); |
227 |
< |
} |
213 |
> |
/* get specular component */ |
214 |
> |
nd.rspec = m->oargs.farg[3]; |
215 |
> |
/* compute transmission */ |
216 |
> |
if (m->otype == MAT_TFUNC || m->otype == MAT_TDATA |
217 |
> |
|| m->otype == MAT_BRTDF) { |
218 |
> |
nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
219 |
> |
nd.tspec = nd.trans * m->oargs.farg[5]; |
220 |
> |
nd.tdiff = nd.trans - nd.tspec; |
221 |
> |
} else |
222 |
> |
nd.tdiff = nd.tspec = nd.trans = 0.0; |
223 |
> |
/* early shadow check */ |
224 |
> |
if (r->crtype & SHADOW && (m->otype != MAT_BRTDF || nd.tspec <= FTINY)) |
225 |
> |
return; |
226 |
> |
/* diffuse reflection */ |
227 |
> |
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
228 |
|
/* get material color */ |
229 |
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setcolor(nd.mcolor, m->oargs.farg[0], |
230 |
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m->oargs.farg[1], |
231 |
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m->oargs.farg[2]); |
232 |
< |
/* get roughness */ |
232 |
> |
/* fix orientation */ |
233 |
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if (r->rod < 0.0) |
234 |
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flipsurface(r); |
235 |
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/* get modifiers */ |
236 |
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raytexture(r, m->omod); |
237 |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
238 |
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multcolor(nd.mcolor, r->pcol); /* modify material color */ |
239 |
< |
r->rt = r->rot; /* default ray length */ |
240 |
< |
/* get specular component */ |
241 |
< |
nd.rspec = m->oargs.farg[3]; |
242 |
< |
|
243 |
< |
if (nd.rspec > FTINY) { /* has specular component */ |
244 |
< |
/* compute specular color */ |
245 |
< |
if (m->otype == MAT_MFUNC || m->otype == MAT_MDATA) |
246 |
< |
copycolor(nd.scolor, nd.mcolor); |
247 |
< |
else |
248 |
< |
setcolor(nd.scolor, 1.0, 1.0, 1.0); |
249 |
< |
scalecolor(nd.scolor, nd.rspec); |
239 |
> |
transtest = 0; |
240 |
> |
/* load auxiliary files */ |
241 |
> |
if (m->otype == MAT_PDATA || m->otype == MAT_MDATA |
242 |
> |
|| m->otype == MAT_TDATA) { |
243 |
> |
nd.dp = getdata(m->oargs.sarg[1]); |
244 |
> |
for (i = 3; i < m->oargs.nsargs; i++) |
245 |
> |
if (m->oargs.sarg[i][0] == '-') |
246 |
> |
break; |
247 |
> |
if (i-3 != nd.dp->nd) |
248 |
> |
objerror(m, USER, "dimension error"); |
249 |
> |
funcfile(m->oargs.sarg[2]); |
250 |
> |
} else if (m->otype == MAT_BRTDF) { |
251 |
> |
nd.dp = NULL; |
252 |
> |
funcfile(m->oargs.sarg[9]); |
253 |
> |
} else { |
254 |
> |
nd.dp = NULL; |
255 |
> |
funcfile(m->oargs.sarg[1]); |
256 |
|
} |
257 |
< |
/* diffuse reflection */ |
258 |
< |
nd.rdiff = 1.0 - nd.rspec; |
257 |
> |
/* set special variables */ |
258 |
> |
setbrdfunc(&nd); |
259 |
> |
/* compute transmitted ray */ |
260 |
> |
tspect = 0.; |
261 |
> |
if (m->otype == MAT_BRTDF && nd.tspec > FTINY) { |
262 |
> |
RAY sr; |
263 |
> |
errno = 0; |
264 |
> |
setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
265 |
> |
varvalue(m->oargs.sarg[4]), |
266 |
> |
varvalue(m->oargs.sarg[5])); |
267 |
> |
scalecolor(ctmp, nd.trans); |
268 |
> |
if (errno) |
269 |
> |
objerror(m, WARNING, "compute error"); |
270 |
> |
else if ((tspect = bright(ctmp)) > FTINY && |
271 |
> |
rayorigin(&sr, r, TRANS, tspect) == 0) { |
272 |
> |
if (!(r->crtype & SHADOW) && |
273 |
> |
DOT(r->pert,r->pert) > FTINY*FTINY) { |
274 |
> |
for (i = 0; i < 3; i++) /* perturb direction */ |
275 |
> |
sr.rdir[i] = r->rdir[i] - |
276 |
> |
.75*r->pert[i]; |
277 |
> |
normalize(sr.rdir); |
278 |
> |
} else { |
279 |
> |
VCOPY(sr.rdir, r->rdir); |
280 |
> |
transtest = 2; |
281 |
> |
} |
282 |
> |
rayvalue(&sr); |
283 |
> |
multcolor(sr.rcol, ctmp); |
284 |
> |
addcolor(r->rcol, sr.rcol); |
285 |
> |
transtest *= bright(sr.rcol); |
286 |
> |
transdist = r->rot + sr.rt; |
287 |
> |
} |
288 |
> |
} |
289 |
> |
if (r->crtype & SHADOW) /* the rest is shadow */ |
290 |
> |
return; |
291 |
> |
/* compute reflected ray */ |
292 |
> |
rspecr = 0.; |
293 |
> |
if (m->otype == MAT_BRTDF && nd.rspec > FTINY) { |
294 |
> |
RAY sr; |
295 |
> |
errno = 0; |
296 |
> |
setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
297 |
> |
varvalue(m->oargs.sarg[1]), |
298 |
> |
varvalue(m->oargs.sarg[2])); |
299 |
> |
if (errno) |
300 |
> |
objerror(m, WARNING, "compute error"); |
301 |
> |
else if ((rspecr = bright(ctmp)) > FTINY && |
302 |
> |
rayorigin(&sr, r, REFLECTED, rspecr) == 0) { |
303 |
> |
for (i = 0; i < 3; i++) |
304 |
> |
sr.rdir[i] = r->rdir[i] + |
305 |
> |
2.0*nd.pdot*nd.pnorm[i]; |
306 |
> |
rayvalue(&sr); |
307 |
> |
multcolor(sr.rcol, ctmp); |
308 |
> |
addcolor(r->rcol, sr.rcol); |
309 |
> |
} |
310 |
> |
} |
311 |
|
/* compute ambient */ |
312 |
< |
if (nd.rdiff > FTINY) { |
312 |
> |
if ((dtmp = 1.0-nd.trans-rspecr) > FTINY) { |
313 |
|
ambient(ctmp, r); |
314 |
+ |
scalecolor(ctmp, dtmp); |
315 |
|
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
316 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
317 |
|
} |
318 |
+ |
if ((dtmp = nd.trans-tspect) > FTINY) { /* from other side */ |
319 |
+ |
flipsurface(r); |
320 |
+ |
ambient(ctmp, r); |
321 |
+ |
scalecolor(ctmp, dtmp); |
322 |
+ |
multcolor(ctmp, nd.mcolor); |
323 |
+ |
addcolor(r->rcol, ctmp); |
324 |
+ |
flipsurface(r); |
325 |
+ |
} |
326 |
|
/* add direct component */ |
327 |
|
direct(r, dirbrdf, &nd); |
328 |
+ |
/* check distance */ |
329 |
+ |
if (transtest > bright(r->rcol)) |
330 |
+ |
r->rt = transdist; |
331 |
+ |
} |
332 |
+ |
|
333 |
+ |
|
334 |
+ |
setbrdfunc(np) /* set up brdf function and variables */ |
335 |
+ |
register BRDFDAT *np; |
336 |
+ |
{ |
337 |
+ |
FVECT vec; |
338 |
+ |
|
339 |
+ |
if (setfunc(np->mp, np->pr) == 0) |
340 |
+ |
return(0); /* it's OK, setfunc says we're done */ |
341 |
+ |
/* else (re)assign special variables */ |
342 |
+ |
multv3(vec, np->pnorm, funcxf.xfm); |
343 |
+ |
varset("NxP", '=', vec[0]/funcxf.sca); |
344 |
+ |
varset("NyP", '=', vec[1]/funcxf.sca); |
345 |
+ |
varset("NzP", '=', vec[2]/funcxf.sca); |
346 |
+ |
varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
347 |
+ |
np->pdot >= 1.0 ? 1.0 : np->pdot); |
348 |
+ |
varset("CrP", '=', colval(np->mcolor,RED)); |
349 |
+ |
varset("CgP", '=', colval(np->mcolor,GRN)); |
350 |
+ |
varset("CbP", '=', colval(np->mcolor,BLU)); |
351 |
+ |
return(1); |
352 |
|
} |