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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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/* |
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* Shading for materials with arbitrary BRDF's |
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*/ |
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|
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#include "ray.h" |
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#include "copyright.h" |
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|
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#include "ray.h" |
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#include "ambient.h" |
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#include "data.h" |
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|
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#include "source.h" |
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#include "otypes.h" |
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#include "rtotypes.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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* The BRDF is currently used just for the specular component to light |
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* sources. Reflectance values or data coordinates are functions |
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* of the direction to the light source. |
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* of the direction to the light source. (Data modification functions |
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* are passed the source direction as args 2-4.) |
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* We orient the surface towards the incoming ray, so a single |
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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_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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* 6+ 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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* 6+ 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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* rbrtd gbrtd bbrtd |
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* funcfile transform |
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* 0 |
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* 6+ red grn blu rspec trans tspec A7 .. |
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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, |
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* we define the following: |
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* NxP, NyP, NzP - perturbed surface normal |
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* RdotP - perturbed ray dot product |
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* CrP, CgP, CbP - perturbed material color |
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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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extern XF funcxf; |
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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, MDATA or TDATA */ |
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COLOR mcolor; /* color of this material */ |
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double rspec; /* specular reflection */ |
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double rdiff; /* diffuse reflection */ |
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double trans; /* transmissivity */ |
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double tspec; /* specular transmission */ |
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double tdiff; /* diffuse transmission */ |
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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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|
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|
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dirbrdf(cval, np, ldir, omega) /* compute source contribution */ |
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COLOR cval; /* returned coefficient */ |
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register BRDFDAT *np; /* material data */ |
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FVECT ldir; /* light source direction */ |
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double omega; /* light source size */ |
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static int setbrdfunc(BRDFDAT *np); |
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|
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|
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static void |
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dirbrdf( /* compute source contribution */ |
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COLOR cval, /* returned coefficient */ |
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void *nnp, /* material data */ |
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FVECT ldir, /* light source direction */ |
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double omega /* light source size */ |
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) |
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{ |
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BRDFDAT *np = nnp; |
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double ldot; |
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double dtmp; |
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COLOR ctmp; |
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FVECT ldx; |
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double pt[MAXDIM]; |
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register char **sa; |
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register int i; |
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static double vldx[5], pt[MAXDIM]; |
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char **sa; |
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int i; |
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#define lddx (vldx+1) |
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|
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setcolor(cval, 0.0, 0.0, 0.0); |
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|
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|
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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 (ldot > 0.0 && np->rdiff > FTINY) { |
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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); |
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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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< |
} |
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< |
if (ldot < 0.0 && np->tdiff > FTINY) { |
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> |
} else { |
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/* |
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* Diffuse transmitted component. |
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*/ |
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< |
copycolor(ctmp, np->mcolor); |
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dtmp = -ldot * omega * np->tdiff / PI; |
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> |
copycolor(ctmp, np->tdiff); |
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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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} |
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if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
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return; /* no specular component */ |
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> |
return; /* diffuse only */ |
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/* set up function */ |
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setbrdfunc(np); |
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sa = np->mp->oargs.sarg; |
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/* transform light vector */ |
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multv3(ldx, ldir, funcxf.xfm); |
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for (i = 0; i < 3; i++) |
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< |
ldx[i] /= funcxf.sca; |
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> |
lddx[i] = ldx[i]/funcxf.sca; |
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> |
lddx[3] = omega; |
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/* compute BRTDF */ |
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if (np->mp->otype == MAT_BRTDF) { |
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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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> |
if (sa[6][0] == '0' && !sa[6][1]) /* special case */ |
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> |
colval(ctmp,RED) = 0.0; |
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> |
else |
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> |
colval(ctmp,RED) = funvalue(sa[6], 4, lddx); |
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> |
if (sa[7][0] == '0' && !sa[7][1]) |
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> |
colval(ctmp,GRN) = 0.0; |
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> |
else 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,GRN) = funvalue(sa[7], 4, lddx); |
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if (sa[8][0] == '0' && !sa[8][1]) |
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colval(ctmp,BLU) = 0.0; |
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else 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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> |
colval(ctmp,BLU) = funvalue(sa[8], 4, 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, ldx); |
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> |
dtmp = funvalue(sa[0], 4, 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, ldx); |
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dtmp = datavalue(np->dp, pt); |
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< |
dtmp = funvalue(sa[0], 1, &dtmp); |
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> |
pt[i] = funvalue(sa[3+i], 4, lddx); |
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vldx[0] = datavalue(np->dp, pt); |
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dtmp = funvalue(sa[0], 5, vldx); |
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setcolor(ctmp, dtmp, dtmp, dtmp); |
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} |
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< |
if (errno) |
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< |
goto computerr; |
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> |
if ((errno == EDOM) | (errno == ERANGE)) { |
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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 reflected non-diffuse component. |
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*/ |
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< |
if (np->mp->otype == MAT_MFUNC || np->mp->otype == MAT_MDATA) |
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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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/* |
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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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> |
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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> |
#undef lddx |
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} |
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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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< |
register OBJREC *m; |
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< |
register RAY *r; |
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> |
int |
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> |
m_brdf( /* color a ray that hit a BRDTfunc material */ |
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> |
OBJREC *m, |
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> |
RAY *r |
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> |
) |
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{ |
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< |
int minsa, minfa; |
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> |
int hitfront = 1; |
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BRDFDAT nd; |
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< |
double transtest, transdist; |
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> |
RAY sr; |
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> |
double mirtest=0, mirdist=0; |
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> |
double transtest=0, transdist=0; |
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> |
int hasrefl, hastrans; |
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> |
int hastexture; |
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COLOR ctmp; |
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< |
double dtmp; |
| 216 |
< |
register int i; |
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> |
FVECT vtmp; |
| 216 |
> |
double d; |
| 217 |
> |
MFUNC *mf; |
| 218 |
> |
int i; |
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/* check arguments */ |
| 220 |
< |
switch (m->otype) { |
| 198 |
< |
case MAT_PFUNC: case MAT_MFUNC: |
| 199 |
< |
minsa = 2; minfa = 4; break; |
| 200 |
< |
case MAT_PDATA: case MAT_MDATA: |
| 201 |
< |
minsa = 4; minfa = 4; break; |
| 202 |
< |
case MAT_TFUNC: |
| 203 |
< |
minsa = 2; minfa = 6; break; |
| 204 |
< |
case MAT_TDATA: |
| 205 |
< |
minsa = 4; minfa = 6; break; |
| 206 |
< |
case MAT_BRTDF: |
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< |
minsa = 10; minfa = 6; break; |
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< |
} |
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< |
if (m->oargs.nsargs < minsa || m->oargs.nfargs < minfa) |
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> |
if ((m->oargs.nsargs < 10) | (m->oargs.nfargs < 9)) |
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objerror(m, USER, "bad # arguments"); |
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nd.mp = m; |
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nd.pr = r; |
| 224 |
< |
/* get specular component */ |
| 225 |
< |
nd.rspec = m->oargs.farg[3]; |
| 226 |
< |
/* compute transmission */ |
| 227 |
< |
if (m->otype == MAT_TFUNC || m->otype == MAT_TDATA |
| 228 |
< |
|| m->otype == MAT_BRTDF) { |
| 229 |
< |
nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
| 230 |
< |
nd.tspec = nd.trans * m->oargs.farg[5]; |
| 231 |
< |
nd.tdiff = nd.trans - nd.tspec; |
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< |
} else |
| 233 |
< |
nd.tdiff = nd.tspec = nd.trans = 0.0; |
| 234 |
< |
/* early shadow check */ |
| 235 |
< |
if (r->crtype & SHADOW && (m->otype != MAT_BRTDF || nd.tspec <= FTINY)) |
| 236 |
< |
return; |
| 237 |
< |
/* diffuse reflection */ |
| 238 |
< |
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
| 239 |
< |
/* get material color */ |
| 229 |
< |
setcolor(nd.mcolor, m->oargs.farg[0], |
| 230 |
< |
m->oargs.farg[1], |
| 231 |
< |
m->oargs.farg[2]); |
| 232 |
< |
/* fix orientation */ |
| 233 |
< |
if (r->rod < 0.0) |
| 234 |
< |
flipsurface(r); |
| 224 |
> |
/* dummy values */ |
| 225 |
> |
nd.rspec = nd.tspec = 1.0; |
| 226 |
> |
nd.trans = 0.5; |
| 227 |
> |
/* diffuse reflectance */ |
| 228 |
> |
if (r->rod > 0.0) |
| 229 |
> |
setcolor(nd.rdiff, m->oargs.farg[0], |
| 230 |
> |
m->oargs.farg[1], |
| 231 |
> |
m->oargs.farg[2]); |
| 232 |
> |
else |
| 233 |
> |
setcolor(nd.rdiff, m->oargs.farg[3], |
| 234 |
> |
m->oargs.farg[4], |
| 235 |
> |
m->oargs.farg[5]); |
| 236 |
> |
/* diffuse transmittance */ |
| 237 |
> |
setcolor(nd.tdiff, m->oargs.farg[6], |
| 238 |
> |
m->oargs.farg[7], |
| 239 |
> |
m->oargs.farg[8]); |
| 240 |
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/* get modifiers */ |
| 241 |
|
raytexture(r, m->omod); |
| 242 |
< |
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
| 243 |
< |
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
| 244 |
< |
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 |
< |
if (!fundefined(m->oargs.sarg[3])) |
| 250 |
< |
loadfunc(m->oargs.sarg[2]); |
| 251 |
< |
} else if (m->otype == MAT_BRTDF) { |
| 252 |
< |
nd.dp = NULL; |
| 253 |
< |
if (!fundefined(m->oargs.sarg[7])) |
| 254 |
< |
loadfunc(m->oargs.sarg[9]); |
| 242 |
> |
hastexture = DOT(r->pert,r->pert) > FTINY*FTINY; |
| 243 |
> |
if (hastexture) { /* perturb normal */ |
| 244 |
> |
nd.pdot = raynormal(nd.pnorm, r); |
| 245 |
|
} else { |
| 246 |
< |
nd.dp = NULL; |
| 247 |
< |
if (!fundefined(m->oargs.sarg[0])) |
| 258 |
< |
loadfunc(m->oargs.sarg[1]); |
| 246 |
> |
VCOPY(nd.pnorm, r->ron); |
| 247 |
> |
nd.pdot = r->rod; |
| 248 |
|
} |
| 249 |
< |
/* set special variables */ |
| 250 |
< |
setbrdfunc(&nd); |
| 249 |
> |
if (r->rod < 0.0) { /* orient perturbed values */ |
| 250 |
> |
nd.pdot = -nd.pdot; |
| 251 |
> |
for (i = 0; i < 3; i++) { |
| 252 |
> |
nd.pnorm[i] = -nd.pnorm[i]; |
| 253 |
> |
r->pert[i] = -r->pert[i]; |
| 254 |
> |
} |
| 255 |
> |
hitfront = 0; |
| 256 |
> |
} |
| 257 |
> |
copycolor(nd.mcolor, r->pcol); /* get pattern color */ |
| 258 |
> |
multcolor(nd.rdiff, nd.mcolor); /* modify diffuse values */ |
| 259 |
> |
multcolor(nd.tdiff, nd.mcolor); |
| 260 |
> |
hasrefl = bright(nd.rdiff) > FTINY; |
| 261 |
> |
hastrans = bright(nd.tdiff) > FTINY; |
| 262 |
> |
/* load cal file */ |
| 263 |
> |
nd.dp = NULL; |
| 264 |
> |
mf = getfunc(m, 9, 0x3f, 0); |
| 265 |
|
/* compute transmitted ray */ |
| 266 |
< |
if (m->otype == MAT_BRTDF && nd.tspec > FTINY) { |
| 267 |
< |
RAY sr; |
| 268 |
< |
errno = 0; |
| 269 |
< |
setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
| 270 |
< |
varvalue(m->oargs.sarg[1]), |
| 271 |
< |
varvalue(m->oargs.sarg[2])); |
| 272 |
< |
scalecolor(ctmp, nd.tspec); |
| 273 |
< |
if (errno) |
| 274 |
< |
objerror(m, WARNING, "compute error"); |
| 275 |
< |
else if ((dtmp = bright(ctmp)) > FTINY && |
| 276 |
< |
rayorigin(&sr, r, TRANS, dtmp) == 0) { |
| 277 |
< |
if (DOT(r->pert,r->pert) > FTINY*FTINY) { |
| 278 |
< |
for (i = 0; i < 3; i++) /* perturb direction */ |
| 276 |
< |
sr.rdir[i] = r->rdir[i] - |
| 277 |
< |
.75*r->pert[i]; |
| 278 |
< |
normalize(sr.rdir); |
| 279 |
< |
} else { |
| 266 |
> |
setbrdfunc(&nd); |
| 267 |
> |
errno = 0; |
| 268 |
> |
setcolor(ctmp, evalue(mf->ep[3]), |
| 269 |
> |
evalue(mf->ep[4]), |
| 270 |
> |
evalue(mf->ep[5])); |
| 271 |
> |
if ((errno == EDOM) | (errno == ERANGE)) |
| 272 |
> |
objerror(m, WARNING, "compute error"); |
| 273 |
> |
else if (rayorigin(&sr, TRANS, r, ctmp) == 0) { |
| 274 |
> |
if (!(r->crtype & SHADOW) && hastexture) { |
| 275 |
> |
/* perturb direction */ |
| 276 |
> |
VSUM(sr.rdir, r->rdir, r->pert, -.75); |
| 277 |
> |
if (normalize(sr.rdir) == 0.0) { |
| 278 |
> |
objerror(m, WARNING, "illegal perturbation"); |
| 279 |
|
VCOPY(sr.rdir, r->rdir); |
| 281 |
– |
transtest = 2; |
| 280 |
|
} |
| 281 |
< |
rayvalue(&sr); |
| 282 |
< |
multcolor(sr.rcol, ctmp); |
| 283 |
< |
addcolor(r->rcol, sr.rcol); |
| 284 |
< |
transtest *= bright(sr.rcol); |
| 281 |
> |
} else { |
| 282 |
> |
VCOPY(sr.rdir, r->rdir); |
| 283 |
> |
} |
| 284 |
> |
rayvalue(&sr); |
| 285 |
> |
multcolor(sr.rcol, sr.rcoef); |
| 286 |
> |
addcolor(r->rcol, sr.rcol); |
| 287 |
> |
if (!hastexture) { |
| 288 |
> |
transtest = 2.0*bright(sr.rcol); |
| 289 |
|
transdist = r->rot + sr.rt; |
| 290 |
|
} |
| 291 |
|
} |
| 292 |
|
if (r->crtype & SHADOW) /* the rest is shadow */ |
| 293 |
< |
return; |
| 293 |
> |
return(1); |
| 294 |
|
/* compute reflected ray */ |
| 295 |
< |
if (m->otype == MAT_BRTDF && nd.rspec > FTINY) { |
| 296 |
< |
RAY sr; |
| 297 |
< |
errno = 0; |
| 298 |
< |
setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
| 299 |
< |
varvalue(m->oargs.sarg[4]), |
| 300 |
< |
varvalue(m->oargs.sarg[5])); |
| 301 |
< |
scalecolor(ctmp, nd.rspec); |
| 302 |
< |
if (errno) |
| 303 |
< |
objerror(m, WARNING, "compute error"); |
| 304 |
< |
else if ((dtmp = bright(ctmp)) > FTINY && |
| 305 |
< |
rayorigin(&sr, r, REFLECTED, dtmp) == 0) { |
| 306 |
< |
for (i = 0; i < 3; i++) |
| 307 |
< |
sr.rdir[i] = r->rdir[i] + |
| 308 |
< |
2.0*nd.pdot*nd.pnorm[i]; |
| 309 |
< |
rayvalue(&sr); |
| 310 |
< |
multcolor(sr.rcol, ctmp); |
| 309 |
< |
addcolor(r->rcol, sr.rcol); |
| 295 |
> |
setbrdfunc(&nd); |
| 296 |
> |
errno = 0; |
| 297 |
> |
setcolor(ctmp, evalue(mf->ep[0]), |
| 298 |
> |
evalue(mf->ep[1]), |
| 299 |
> |
evalue(mf->ep[2])); |
| 300 |
> |
if ((errno == EDOM) | (errno == ERANGE)) |
| 301 |
> |
objerror(m, WARNING, "compute error"); |
| 302 |
> |
else if (rayorigin(&sr, REFLECTED, r, ctmp) == 0) { |
| 303 |
> |
VSUM(sr.rdir, r->rdir, nd.pnorm, 2.*nd.pdot); |
| 304 |
> |
checknorm(sr.rdir); |
| 305 |
> |
rayvalue(&sr); |
| 306 |
> |
multcolor(sr.rcol, sr.rcoef); |
| 307 |
> |
addcolor(r->rcol, sr.rcol); |
| 308 |
> |
if (!hastexture && r->ro != NULL && isflat(r->ro->otype)) { |
| 309 |
> |
mirtest = 2.0*bright(sr.rcol); |
| 310 |
> |
mirdist = r->rot + sr.rt; |
| 311 |
|
} |
| 312 |
|
} |
| 313 |
|
/* compute ambient */ |
| 314 |
< |
if (nd.rdiff > FTINY) { |
| 315 |
< |
ambient(ctmp, r); |
| 316 |
< |
if (m->otype == MAT_BRTDF) |
| 317 |
< |
scalecolor(ctmp, nd.rdiff); |
| 318 |
< |
else |
| 318 |
< |
scalecolor(ctmp, 1.0-nd.trans); |
| 319 |
< |
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
| 314 |
> |
if (hasrefl) { |
| 315 |
> |
if (!hitfront) |
| 316 |
> |
flipsurface(r); |
| 317 |
> |
copycolor(ctmp, nd.rdiff); |
| 318 |
> |
multambient(ctmp, r, nd.pnorm); |
| 319 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 320 |
+ |
if (!hitfront) |
| 321 |
+ |
flipsurface(r); |
| 322 |
|
} |
| 323 |
< |
if (nd.tdiff > FTINY) { /* from other side */ |
| 323 |
> |
if (hastrans) { /* from other side */ |
| 324 |
> |
if (hitfront) |
| 325 |
> |
flipsurface(r); |
| 326 |
> |
vtmp[0] = -nd.pnorm[0]; |
| 327 |
> |
vtmp[1] = -nd.pnorm[1]; |
| 328 |
> |
vtmp[2] = -nd.pnorm[2]; |
| 329 |
> |
copycolor(ctmp, nd.tdiff); |
| 330 |
> |
multambient(ctmp, r, vtmp); |
| 331 |
> |
addcolor(r->rcol, ctmp); |
| 332 |
> |
if (hitfront) |
| 333 |
> |
flipsurface(r); |
| 334 |
> |
} |
| 335 |
> |
if (hasrefl | hastrans || m->oargs.sarg[6][0] != '0') |
| 336 |
> |
direct(r, dirbrdf, &nd); /* add direct component */ |
| 337 |
> |
|
| 338 |
> |
d = bright(r->rcol); /* set effective distance */ |
| 339 |
> |
if (transtest > d) |
| 340 |
> |
r->rt = transdist; |
| 341 |
> |
else if (mirtest > d) |
| 342 |
> |
r->rt = mirdist; |
| 343 |
> |
|
| 344 |
> |
return(1); |
| 345 |
> |
} |
| 346 |
> |
|
| 347 |
> |
|
| 348 |
> |
|
| 349 |
> |
int |
| 350 |
> |
m_brdf2( /* color a ray that hit a BRDF material */ |
| 351 |
> |
OBJREC *m, |
| 352 |
> |
RAY *r |
| 353 |
> |
) |
| 354 |
> |
{ |
| 355 |
> |
BRDFDAT nd; |
| 356 |
> |
COLOR ctmp; |
| 357 |
> |
FVECT vtmp; |
| 358 |
> |
double dtmp; |
| 359 |
> |
/* always a shadow */ |
| 360 |
> |
if (r->crtype & SHADOW) |
| 361 |
> |
return(1); |
| 362 |
> |
/* check arguments */ |
| 363 |
> |
if ((m->oargs.nsargs < (hasdata(m->otype)?4:2)) | (m->oargs.nfargs < |
| 364 |
> |
((m->otype==MAT_TFUNC)|(m->otype==MAT_TDATA)?6:4))) |
| 365 |
> |
objerror(m, USER, "bad # arguments"); |
| 366 |
> |
/* check for back side */ |
| 367 |
> |
if (r->rod < 0.0) { |
| 368 |
> |
if (!backvis) { |
| 369 |
> |
raytrans(r); |
| 370 |
> |
return(1); |
| 371 |
> |
} |
| 372 |
> |
raytexture(r, m->omod); |
| 373 |
> |
flipsurface(r); /* reorient if backvis */ |
| 374 |
> |
} else |
| 375 |
> |
raytexture(r, m->omod); |
| 376 |
> |
|
| 377 |
> |
nd.mp = m; |
| 378 |
> |
nd.pr = r; |
| 379 |
> |
/* get material color */ |
| 380 |
> |
setcolor(nd.mcolor, m->oargs.farg[0], |
| 381 |
> |
m->oargs.farg[1], |
| 382 |
> |
m->oargs.farg[2]); |
| 383 |
> |
/* get specular component */ |
| 384 |
> |
nd.rspec = m->oargs.farg[3]; |
| 385 |
> |
/* compute transmittance */ |
| 386 |
> |
if ((m->otype == MAT_TFUNC) | (m->otype == MAT_TDATA)) { |
| 387 |
> |
nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
| 388 |
> |
nd.tspec = nd.trans * m->oargs.farg[5]; |
| 389 |
> |
dtmp = nd.trans - nd.tspec; |
| 390 |
> |
setcolor(nd.tdiff, dtmp, dtmp, dtmp); |
| 391 |
> |
} else { |
| 392 |
> |
nd.tspec = nd.trans = 0.0; |
| 393 |
> |
setcolor(nd.tdiff, 0.0, 0.0, 0.0); |
| 394 |
> |
} |
| 395 |
> |
/* compute reflectance */ |
| 396 |
> |
dtmp = 1.0 - nd.trans - nd.rspec; |
| 397 |
> |
setcolor(nd.rdiff, dtmp, dtmp, dtmp); |
| 398 |
> |
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
| 399 |
> |
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
| 400 |
> |
multcolor(nd.rdiff, nd.mcolor); |
| 401 |
> |
multcolor(nd.tdiff, nd.mcolor); |
| 402 |
> |
/* load auxiliary files */ |
| 403 |
> |
if (hasdata(m->otype)) { |
| 404 |
> |
nd.dp = getdata(m->oargs.sarg[1]); |
| 405 |
> |
getfunc(m, 2, 0, 0); |
| 406 |
> |
} else { |
| 407 |
> |
nd.dp = NULL; |
| 408 |
> |
getfunc(m, 1, 0, 0); |
| 409 |
> |
} |
| 410 |
> |
/* compute ambient */ |
| 411 |
> |
if (nd.trans < 1.0-FTINY) { |
| 412 |
> |
copycolor(ctmp, nd.mcolor); /* modified by material color */ |
| 413 |
> |
scalecolor(ctmp, 1.0-nd.trans); |
| 414 |
> |
multambient(ctmp, r, nd.pnorm); |
| 415 |
> |
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 416 |
> |
} |
| 417 |
> |
if (nd.trans > FTINY) { /* from other side */ |
| 418 |
|
flipsurface(r); |
| 419 |
< |
ambient(ctmp, r); |
| 420 |
< |
if (m->otype == MAT_BRTDF) |
| 421 |
< |
scalecolor(ctmp, nd.tdiff); |
| 422 |
< |
else |
| 423 |
< |
scalecolor(ctmp, nd.trans); |
| 424 |
< |
multcolor(ctmp, nd.mcolor); |
| 419 |
> |
vtmp[0] = -nd.pnorm[0]; |
| 420 |
> |
vtmp[1] = -nd.pnorm[1]; |
| 421 |
> |
vtmp[2] = -nd.pnorm[2]; |
| 422 |
> |
copycolor(ctmp, nd.mcolor); |
| 423 |
> |
scalecolor(ctmp, nd.trans); |
| 424 |
> |
multambient(ctmp, r, vtmp); |
| 425 |
|
addcolor(r->rcol, ctmp); |
| 426 |
|
flipsurface(r); |
| 427 |
|
} |
| 428 |
|
/* add direct component */ |
| 429 |
|
direct(r, dirbrdf, &nd); |
| 430 |
< |
/* check distance */ |
| 431 |
< |
if (transtest > bright(r->rcol)) |
| 337 |
< |
r->rt = transdist; |
| 430 |
> |
|
| 431 |
> |
return(1); |
| 432 |
|
} |
| 433 |
|
|
| 434 |
|
|
| 435 |
< |
setbrdfunc(np) /* set up brdf function and variables */ |
| 436 |
< |
register BRDFDAT *np; |
| 435 |
> |
static int |
| 436 |
> |
setbrdfunc( /* set up brdf function and variables */ |
| 437 |
> |
BRDFDAT *np |
| 438 |
> |
) |
| 439 |
|
{ |
| 440 |
|
FVECT vec; |
| 441 |
|
|
