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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"; |
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#include "otypes.h" |
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#include "func.h" |
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|
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/* |
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* Arguments to this material include the color and specularity. |
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* String arguments include the reflection function and files. |
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* surface can be used to represent an infinitely thin object. |
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* |
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* Arguments for MAT_PFUNC and MAT_MFUNC are: |
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* 2+ func funcfile transform .. |
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* 2+ func funcfile transform |
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* 0 |
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* 4+ red grn blu specularity args .. |
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* 4+ red grn blu specularity A5 .. |
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* |
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* Arguments for MAT_PDATA and MAT_MDATA are: |
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* 4+ func datafile funcfile v0 .. transform .. |
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* 4+ func datafile funcfile v0 .. transform |
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* 0 |
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* 4+ red grn blu specularity args .. |
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* 4+ red grn blu specularity A5 .. |
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* |
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* Arguments for MAT_TFUNC are: |
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* 2+ func funcfile transform |
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* 0 |
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* 4+ red grn blu rspec trans tspec A7 .. |
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* |
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* Arguments for MAT_TDATA are: |
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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 .. |
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* |
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* Arguments for the more general MAT_BRTDF are: |
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* 10+ rrefl grefl brefl |
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* rtrns gtrns btrns |
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* rbrtd gbrtd bbrtd |
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* funcfile transform |
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* 0 |
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* 9+ rdf gdf bdf |
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* rdb gdb bdb |
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* rdt gdt bdt A10 .. |
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* |
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* In addition to the normal variables available to functions, |
59 |
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* we define the following: |
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* NxP, NyP, NzP - perturbed surface normal |
61 |
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* RdotP - perturbed ray dot product |
62 |
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* CrP, CgP, CbP - perturbed material color (or pattern) |
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*/ |
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|
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extern double funvalue(), varvalue(); |
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|
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#define BSPEC(m) (6.0) /* specular parameter b */ |
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|
65 |
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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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COLOR mcolor; /* color of this material */ |
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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 */ |
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DATARRAY *dp; /* data array for PDATA, MDATA or TDATA */ |
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COLOR mcolor; /* material (or pattern) color */ |
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COLOR rdiff; /* diffuse reflection */ |
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COLOR tdiff; /* diffuse transmission */ |
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double rspec; /* specular reflectance (1 for BRDTF) */ |
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double trans; /* transmissivity (.5 for BRDTF) */ |
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double tspec; /* specular transmittance (1 for BRDTF) */ |
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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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double ldot; |
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double dtmp; |
88 |
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COLOR ctmp; |
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double pt[MAXDIM]; |
89 |
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FVECT ldx; |
90 |
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double lddx[3], pt[MAXDIM]; |
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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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|
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if (ldot < 0.0) |
98 |
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if (ldot <= FTINY && ldot >= -FTINY) |
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return; /* too close to grazing */ |
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|
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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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|
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if (np->rdiff > FTINY) { |
104 |
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if (ldot > 0.0) { |
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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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* modified by the color of the material. |
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*/ |
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copycolor(ctmp, np->mcolor); |
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dtmp = ldot * omega * np->rdiff / PI; |
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copycolor(ctmp, np->rdiff); |
111 |
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dtmp = ldot * omega / PI; |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} else { |
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/* |
116 |
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* Diffuse transmitted component. |
117 |
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*/ |
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copycolor(ctmp, np->tdiff); |
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dtmp = -ldot * omega / PI; |
120 |
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scalecolor(ctmp, dtmp); |
121 |
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addcolor(cval, ctmp); |
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} |
123 |
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if (np->rspec > FTINY) { |
123 |
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if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
124 |
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return; /* no specular component */ |
125 |
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/* set up function */ |
126 |
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setbrdfunc(np); |
127 |
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sa = np->mp->oargs.sarg; |
128 |
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errno = 0; |
129 |
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/* transform light vector */ |
130 |
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multv3(ldx, ldir, funcxf.xfm); |
131 |
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for (i = 0; i < 3; i++) |
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lddx[i] = ldx[i]/funcxf.sca; |
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/* compute BRTDF */ |
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if (np->mp->otype == MAT_BRTDF) { |
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if (sa[6][0] == '0') /* special case */ |
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colval(ctmp,RED) = 0.0; |
137 |
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else |
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colval(ctmp,RED) = funvalue(sa[6], 3, lddx); |
139 |
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if (!strcmp(sa[7],sa[6])) |
140 |
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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, lddx); |
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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, lddx); |
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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, lddx); |
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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, lddx); |
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dtmp = datavalue(np->dp, pt); |
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dtmp = funvalue(sa[0], 1, &dtmp); |
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setcolor(ctmp, dtmp, dtmp, dtmp); |
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} |
160 |
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if (errno) { |
161 |
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objerror(np->mp, WARNING, "compute error"); |
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return; |
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} |
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if (dtmp <= FTINY) |
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return; |
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if (ldot > 0.0) { |
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/* |
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* Compute specular component. |
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* Compute reflected non-diffuse component. |
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*/ |
170 |
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setfunc(np->mp, np->pr); |
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errno = 0; |
172 |
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if (np->dp == NULL) |
173 |
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dtmp = funvalue(np->mp->oargs.sarg[0], 3, ldir); |
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else { |
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for (i = 0; i < np->dp->nd; i++) |
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pt[i] = funvalue(np->mp->oargs.sarg[3+i], |
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3, ldir); |
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dtmp = datavalue(np->dp, pt); |
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dtmp = funvalue(np->mp->oargs.sarg[0], 1, &dtmp); |
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} |
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if (errno) |
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goto computerr; |
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if (dtmp > FTINY) { |
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copycolor(ctmp, np->scolor); |
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dtmp *= ldot * omega; |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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if (np->mp->otype == MAT_MFUNC | np->mp->otype == MAT_MDATA) |
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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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return; |
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} |
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|
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m_brdf(m, r) /* color a ray which hit a BRDF material */ |
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m_brdf(m, r) /* color a ray which hit a BRDTF material */ |
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register OBJREC *m; |
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register RAY *r; |
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{ |
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BRDFDAT nd; |
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double dtmp; |
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RAY sr; |
194 |
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double transtest, transdist; |
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int hasrefl, hastrans; |
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COLOR ctmp; |
197 |
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double dtmp; |
198 |
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register MFUNC *mf; |
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register int i; |
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|
201 |
< |
if (m->oargs.nsargs < 2 || m->oargs.nfargs < 4) |
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> |
/* check arguments */ |
201 |
> |
if (m->oargs.nsargs < 10 | m->oargs.nfargs < 9) |
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objerror(m, USER, "bad # arguments"); |
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< |
/* easy shadow test */ |
203 |
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nd.mp = m; |
204 |
> |
nd.pr = r; |
205 |
> |
/* dummy values */ |
206 |
> |
nd.rspec = nd.tspec = 1.0; |
207 |
> |
nd.trans = 0.5; |
208 |
> |
/* diffuse reflectance */ |
209 |
> |
if (r->rod > 0.0) |
210 |
> |
setcolor(nd.rdiff, m->oargs.farg[0], |
211 |
> |
m->oargs.farg[1], |
212 |
> |
m->oargs.farg[2]); |
213 |
> |
else |
214 |
> |
setcolor(nd.rdiff, m->oargs.farg[3], |
215 |
> |
m->oargs.farg[4], |
216 |
> |
m->oargs.farg[5]); |
217 |
> |
/* diffuse transmittance */ |
218 |
> |
setcolor(nd.tdiff, m->oargs.farg[6], |
219 |
> |
m->oargs.farg[7], |
220 |
> |
m->oargs.farg[8]); |
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> |
/* get modifiers */ |
222 |
> |
raytexture(r, m->omod); |
223 |
> |
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
224 |
> |
if (r->rod < 0.0) { /* orient perturbed values */ |
225 |
> |
nd.pdot = -nd.pdot; |
226 |
> |
for (i = 0; i < 3; i++) { |
227 |
> |
nd.pnorm[i] = -nd.pnorm[i]; |
228 |
> |
r->pert[i] = -r->pert[i]; |
229 |
> |
} |
230 |
> |
} |
231 |
> |
copycolor(nd.mcolor, r->pcol); /* get pattern color */ |
232 |
> |
multcolor(nd.rdiff, nd.mcolor); /* modify diffuse values */ |
233 |
> |
multcolor(nd.tdiff, nd.mcolor); |
234 |
> |
hasrefl = bright(nd.rdiff) > FTINY; |
235 |
> |
hastrans = bright(nd.tdiff) > FTINY; |
236 |
> |
/* load cal file */ |
237 |
> |
nd.dp = NULL; |
238 |
> |
mf = getfunc(m, 9, 0x3f, 0); |
239 |
> |
/* compute transmitted ray */ |
240 |
> |
setbrdfunc(&nd); |
241 |
> |
transtest = 0; |
242 |
> |
errno = 0; |
243 |
> |
setcolor(ctmp, evalue(mf->ep[3]), |
244 |
> |
evalue(mf->ep[4]), |
245 |
> |
evalue(mf->ep[5])); |
246 |
> |
if (errno) |
247 |
> |
objerror(m, WARNING, "compute error"); |
248 |
> |
else if (rayorigin(&sr, r, TRANS, bright(ctmp)) == 0) { |
249 |
> |
if (!(r->crtype & SHADOW) && |
250 |
> |
DOT(r->pert,r->pert) > FTINY*FTINY) { |
251 |
> |
for (i = 0; i < 3; i++) /* perturb direction */ |
252 |
> |
sr.rdir[i] = r->rdir[i] - .75*r->pert[i]; |
253 |
> |
if (normalize(sr.rdir) == 0.0) { |
254 |
> |
objerror(m, WARNING, "illegal perturbation"); |
255 |
> |
VCOPY(sr.rdir, r->rdir); |
256 |
> |
} |
257 |
> |
} else { |
258 |
> |
VCOPY(sr.rdir, r->rdir); |
259 |
> |
transtest = 2; |
260 |
> |
} |
261 |
> |
rayvalue(&sr); |
262 |
> |
multcolor(sr.rcol, ctmp); |
263 |
> |
addcolor(r->rcol, sr.rcol); |
264 |
> |
transtest *= bright(sr.rcol); |
265 |
> |
transdist = r->rot + sr.rt; |
266 |
> |
} |
267 |
> |
if (r->crtype & SHADOW) /* the rest is shadow */ |
268 |
> |
return; |
269 |
> |
/* compute reflected ray */ |
270 |
> |
setbrdfunc(&nd); |
271 |
> |
errno = 0; |
272 |
> |
setcolor(ctmp, evalue(mf->ep[0]), |
273 |
> |
evalue(mf->ep[1]), |
274 |
> |
evalue(mf->ep[2])); |
275 |
> |
if (errno) |
276 |
> |
objerror(m, WARNING, "compute error"); |
277 |
> |
else if (rayorigin(&sr, r, REFLECTED, bright(ctmp)) == 0) { |
278 |
> |
for (i = 0; i < 3; i++) |
279 |
> |
sr.rdir[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
280 |
> |
rayvalue(&sr); |
281 |
> |
multcolor(sr.rcol, ctmp); |
282 |
> |
addcolor(r->rcol, sr.rcol); |
283 |
> |
} |
284 |
> |
/* compute ambient */ |
285 |
> |
if (hasrefl) { |
286 |
> |
if (nd.pdot < 0.0) |
287 |
> |
flipsurface(r); |
288 |
> |
ambient(ctmp, r); |
289 |
> |
multcolor(ctmp, nd.rdiff); |
290 |
> |
addcolor(r->rcol, ctmp); /* add to returned color */ |
291 |
> |
if (nd.pdot < 0.0) |
292 |
> |
flipsurface(r); |
293 |
> |
} |
294 |
> |
if (hastrans) { /* from other side */ |
295 |
> |
if (nd.pdot > 0.0) |
296 |
> |
flipsurface(r); |
297 |
> |
ambient(ctmp, r); |
298 |
> |
multcolor(ctmp, nd.tdiff); |
299 |
> |
addcolor(r->rcol, ctmp); |
300 |
> |
if (nd.pdot > 0.0) |
301 |
> |
flipsurface(r); |
302 |
> |
} |
303 |
> |
if (hasrefl | hastrans || m->oargs.sarg[6][0] != '0') |
304 |
> |
direct(r, dirbrdf, &nd); /* add direct component */ |
305 |
> |
/* check distance */ |
306 |
> |
if (transtest > bright(r->rcol)) |
307 |
> |
r->rt = transdist; |
308 |
> |
} |
309 |
> |
|
310 |
> |
|
311 |
> |
|
312 |
> |
m_brdf2(m, r) /* color a ray which hit a BRDF material */ |
313 |
> |
register OBJREC *m; |
314 |
> |
register RAY *r; |
315 |
> |
{ |
316 |
> |
BRDFDAT nd; |
317 |
> |
COLOR ctmp; |
318 |
> |
double dtmp; |
319 |
> |
/* always a shadow */ |
320 |
|
if (r->crtype & SHADOW) |
321 |
|
return; |
322 |
+ |
/* check arguments */ |
323 |
+ |
if (m->oargs.nsargs < (hasdata(m->otype)?4:2) | m->oargs.nfargs < |
324 |
+ |
(m->otype==MAT_TFUNC|m->otype==MAT_TDATA?6:4)) |
325 |
+ |
objerror(m, USER, "bad # arguments"); |
326 |
|
nd.mp = m; |
327 |
|
nd.pr = r; |
131 |
– |
/* load auxiliary files */ |
132 |
– |
if (m->otype == MAT_PDATA || m->otype == MAT_MDATA) { |
133 |
– |
nd.dp = getdata(m->oargs.sarg[1]); |
134 |
– |
for (i = 3; i < m->oargs.nsargs; i++) |
135 |
– |
if (m->oargs.sarg[i][0] == '-') |
136 |
– |
break; |
137 |
– |
if (i-3 != nd.dp->nd) |
138 |
– |
objerror(m, USER, "dimension error"); |
139 |
– |
if (!fundefined(m->oargs.sarg[3])) |
140 |
– |
loadfunc(m->oargs.sarg[2]); |
141 |
– |
} else { |
142 |
– |
nd.dp = NULL; |
143 |
– |
if (!fundefined(m->oargs.sarg[0])) |
144 |
– |
loadfunc(m->oargs.sarg[1]); |
145 |
– |
} |
328 |
|
/* get material color */ |
329 |
|
setcolor(nd.mcolor, m->oargs.farg[0], |
330 |
< |
m->oargs.farg[1], |
331 |
< |
m->oargs.farg[2]); |
332 |
< |
/* get roughness */ |
330 |
> |
m->oargs.farg[1], |
331 |
> |
m->oargs.farg[2]); |
332 |
> |
/* get specular component */ |
333 |
> |
nd.rspec = m->oargs.farg[3]; |
334 |
> |
/* compute transmittance */ |
335 |
> |
if (m->otype == MAT_TFUNC | m->otype == MAT_TDATA) { |
336 |
> |
nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
337 |
> |
nd.tspec = nd.trans * m->oargs.farg[5]; |
338 |
> |
dtmp = nd.trans - nd.tspec; |
339 |
> |
setcolor(nd.tdiff, dtmp, dtmp, dtmp); |
340 |
> |
} else { |
341 |
> |
nd.tspec = nd.trans = 0.0; |
342 |
> |
setcolor(nd.tdiff, 0.0, 0.0, 0.0); |
343 |
> |
} |
344 |
> |
/* compute reflectance */ |
345 |
> |
dtmp = 1.0 - nd.trans - nd.rspec; |
346 |
> |
setcolor(nd.rdiff, dtmp, dtmp, dtmp); |
347 |
> |
/* fix orientation */ |
348 |
|
if (r->rod < 0.0) |
349 |
|
flipsurface(r); |
350 |
|
/* get modifiers */ |
351 |
|
raytexture(r, m->omod); |
352 |
|
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
353 |
|
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
354 |
< |
r->rt = r->rot; /* default ray length */ |
355 |
< |
/* get specular component */ |
356 |
< |
nd.rspec = m->oargs.farg[3]; |
357 |
< |
|
358 |
< |
if (nd.rspec > FTINY) { /* has specular component */ |
359 |
< |
/* compute specular color */ |
360 |
< |
if (m->otype == MAT_MFUNC || m->otype == MAT_MDATA) |
361 |
< |
copycolor(nd.scolor, nd.mcolor); |
362 |
< |
else |
166 |
< |
setcolor(nd.scolor, 1.0, 1.0, 1.0); |
167 |
< |
scalecolor(nd.scolor, nd.rspec); |
168 |
< |
/* improved model */ |
169 |
< |
dtmp = exp(-BSPEC(m)*nd.pdot); |
170 |
< |
for (i = 0; i < 3; i++) |
171 |
< |
colval(nd.scolor,i) += (1.0-colval(nd.scolor,i))*dtmp; |
172 |
< |
nd.rspec += (1.0-nd.rspec)*dtmp; |
354 |
> |
multcolor(nd.rdiff, nd.mcolor); |
355 |
> |
multcolor(nd.tdiff, nd.mcolor); |
356 |
> |
/* load auxiliary files */ |
357 |
> |
if (hasdata(m->otype)) { |
358 |
> |
nd.dp = getdata(m->oargs.sarg[1]); |
359 |
> |
getfunc(m, 2, 0, 0); |
360 |
> |
} else { |
361 |
> |
nd.dp = NULL; |
362 |
> |
getfunc(m, 1, 0, 0); |
363 |
|
} |
174 |
– |
/* diffuse reflection */ |
175 |
– |
nd.rdiff = 1.0 - nd.rspec; |
364 |
|
/* compute ambient */ |
365 |
< |
if (nd.rdiff > FTINY) { |
365 |
> |
if (nd.trans < 1.0-FTINY) { |
366 |
|
ambient(ctmp, r); |
367 |
+ |
scalecolor(ctmp, 1.0-nd.trans); |
368 |
|
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
369 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
370 |
|
} |
371 |
+ |
if (nd.trans > FTINY) { /* from other side */ |
372 |
+ |
flipsurface(r); |
373 |
+ |
ambient(ctmp, r); |
374 |
+ |
scalecolor(ctmp, nd.trans); |
375 |
+ |
multcolor(ctmp, nd.mcolor); |
376 |
+ |
addcolor(r->rcol, ctmp); |
377 |
+ |
flipsurface(r); |
378 |
+ |
} |
379 |
|
/* add direct component */ |
380 |
|
direct(r, dirbrdf, &nd); |
381 |
+ |
} |
382 |
+ |
|
383 |
+ |
|
384 |
+ |
setbrdfunc(np) /* set up brdf function and variables */ |
385 |
+ |
register BRDFDAT *np; |
386 |
+ |
{ |
387 |
+ |
FVECT vec; |
388 |
+ |
|
389 |
+ |
if (setfunc(np->mp, np->pr) == 0) |
390 |
+ |
return(0); /* it's OK, setfunc says we're done */ |
391 |
+ |
/* else (re)assign special variables */ |
392 |
+ |
multv3(vec, np->pnorm, funcxf.xfm); |
393 |
+ |
varset("NxP", '=', vec[0]/funcxf.sca); |
394 |
+ |
varset("NyP", '=', vec[1]/funcxf.sca); |
395 |
+ |
varset("NzP", '=', vec[2]/funcxf.sca); |
396 |
+ |
varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
397 |
+ |
np->pdot >= 1.0 ? 1.0 : np->pdot); |
398 |
+ |
varset("CrP", '=', colval(np->mcolor,RED)); |
399 |
+ |
varset("CgP", '=', colval(np->mcolor,GRN)); |
400 |
+ |
varset("CbP", '=', colval(np->mcolor,BLU)); |
401 |
+ |
return(1); |
402 |
|
} |