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greg |
1.7 |
/* Copyright (c) 1991 Regents of the University of California */ |
| 2 |
greg |
1.1 |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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* Shading for materials with arbitrary BRDF's |
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*/ |
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#include "ray.h" |
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#include "data.h" |
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#include "otypes.h" |
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greg |
2.2 |
#include "func.h" |
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greg |
2.11 |
extern int backvis; /* back faces visible? */ |
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greg |
1.1 |
/* |
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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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greg |
2.7 |
* 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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greg |
1.1 |
* 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_PFUNC and MAT_MFUNC are: |
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greg |
1.4 |
* 2+ func funcfile transform |
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greg |
1.1 |
* 0 |
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greg |
1.4 |
* 4+ red grn blu specularity A5 .. |
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greg |
1.1 |
* |
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* Arguments for MAT_PDATA and MAT_MDATA are: |
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greg |
1.4 |
* 4+ func datafile funcfile v0 .. transform |
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greg |
1.1 |
* 0 |
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greg |
1.4 |
* 4+ red grn blu specularity A5 .. |
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greg |
1.5 |
* |
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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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greg |
2.6 |
* 9+ rdf gdf bdf |
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* rdb gdb bdb |
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* rdt gdt bdt A10 .. |
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greg |
1.5 |
* |
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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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greg |
2.6 |
* CrP, CgP, CbP - perturbed material color (or pattern) |
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greg |
1.1 |
*/ |
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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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greg |
1.5 |
DATARRAY *dp; /* data array for PDATA, MDATA or TDATA */ |
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greg |
2.6 |
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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greg |
1.1 |
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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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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{ |
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double ldot; |
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double dtmp; |
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COLOR ctmp; |
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greg |
1.4 |
FVECT ldx; |
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greg |
2.3 |
double lddx[3], pt[MAXDIM]; |
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greg |
2.7 |
double vldx[4]; |
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greg |
1.5 |
register char **sa; |
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greg |
1.1 |
register int i; |
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setcolor(cval, 0.0, 0.0, 0.0); |
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ldot = DOT(np->pnorm, ldir); |
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greg |
1.5 |
if (ldot <= FTINY && ldot >= -FTINY) |
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return; /* too close to grazing */ |
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greg |
2.6 |
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greg |
1.5 |
if (ldot < 0.0 ? np->trans <= FTINY : np->trans >= 1.0-FTINY) |
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greg |
1.1 |
return; /* wrong side */ |
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greg |
2.6 |
if (ldot > 0.0) { |
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greg |
1.1 |
/* |
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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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greg |
2.6 |
copycolor(ctmp, np->rdiff); |
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dtmp = ldot * omega / PI; |
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greg |
1.1 |
scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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greg |
2.6 |
} else { |
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greg |
1.1 |
/* |
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greg |
1.5 |
* Diffuse transmitted component. |
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greg |
1.1 |
*/ |
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greg |
2.6 |
copycolor(ctmp, np->tdiff); |
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dtmp = -ldot * omega / PI; |
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greg |
1.5 |
scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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greg |
1.1 |
} |
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greg |
1.5 |
if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
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return; /* no specular component */ |
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/* set up function */ |
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greg |
1.10 |
setbrdfunc(np); |
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greg |
1.5 |
sa = np->mp->oargs.sarg; |
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errno = 0; |
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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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greg |
2.3 |
lddx[i] = ldx[i]/funcxf.sca; |
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greg |
1.5 |
/* compute BRTDF */ |
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if (np->mp->otype == MAT_BRTDF) { |
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greg |
2.6 |
if (sa[6][0] == '0') /* 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], 3, lddx); |
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greg |
1.7 |
if (!strcmp(sa[7],sa[6])) |
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greg |
1.5 |
colval(ctmp,GRN) = colval(ctmp,RED); |
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else |
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greg |
2.3 |
colval(ctmp,GRN) = funvalue(sa[7], 3, lddx); |
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greg |
1.7 |
if (!strcmp(sa[8],sa[6])) |
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greg |
1.5 |
colval(ctmp,BLU) = colval(ctmp,RED); |
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greg |
1.7 |
else if (!strcmp(sa[8],sa[7])) |
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greg |
1.5 |
colval(ctmp,BLU) = colval(ctmp,GRN); |
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else |
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greg |
2.3 |
colval(ctmp,BLU) = funvalue(sa[8], 3, lddx); |
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greg |
1.5 |
dtmp = bright(ctmp); |
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} else if (np->dp == NULL) { |
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greg |
2.3 |
dtmp = funvalue(sa[0], 3, lddx); |
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greg |
1.5 |
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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greg |
2.3 |
pt[i] = funvalue(sa[3+i], 3, lddx); |
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greg |
2.7 |
vldx[0] = datavalue(np->dp, pt); |
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vldx[1] = lddx[0]; vldx[2] = lddx[1]; vldx[3] = lddx[2]; |
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dtmp = funvalue(sa[0], 4, vldx); |
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greg |
1.5 |
setcolor(ctmp, dtmp, dtmp, dtmp); |
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} |
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greg |
2.2 |
if (errno) { |
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objerror(np->mp, WARNING, "compute error"); |
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return; |
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} |
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greg |
1.5 |
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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greg |
2.6 |
if (np->mp->otype == MAT_MFUNC | np->mp->otype == MAT_MDATA) |
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greg |
1.6 |
multcolor(ctmp, np->mcolor); |
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dtmp = ldot * omega * np->rspec; |
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greg |
1.5 |
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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greg |
2.6 |
if (np->mp->otype == MAT_TFUNC | np->mp->otype == MAT_TDATA) |
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greg |
1.6 |
multcolor(ctmp, np->mcolor); |
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greg |
1.5 |
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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greg |
1.1 |
} |
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greg |
2.6 |
m_brdf(m, r) /* color a ray which hit a BRDTF material */ |
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greg |
1.1 |
register OBJREC *m; |
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register RAY *r; |
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{ |
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BRDFDAT nd; |
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greg |
2.6 |
RAY sr; |
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greg |
1.7 |
double transtest, transdist; |
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greg |
2.6 |
int hasrefl, hastrans; |
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greg |
1.1 |
COLOR ctmp; |
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greg |
2.6 |
register MFUNC *mf; |
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greg |
1.1 |
register int i; |
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greg |
1.5 |
/* check arguments */ |
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greg |
2.6 |
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; |
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/* dummy values */ |
| 210 |
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nd.rspec = nd.tspec = 1.0; |
| 211 |
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nd.trans = 0.5; |
| 212 |
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/* diffuse reflectance */ |
| 213 |
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if (r->rod > 0.0) |
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setcolor(nd.rdiff, m->oargs.farg[0], |
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m->oargs.farg[1], |
| 216 |
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m->oargs.farg[2]); |
| 217 |
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else |
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setcolor(nd.rdiff, m->oargs.farg[3], |
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m->oargs.farg[4], |
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m->oargs.farg[5]); |
| 221 |
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/* diffuse transmittance */ |
| 222 |
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setcolor(nd.tdiff, m->oargs.farg[6], |
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m->oargs.farg[7], |
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m->oargs.farg[8]); |
| 225 |
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/* get modifiers */ |
| 226 |
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raytexture(r, m->omod); |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
| 228 |
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if (r->rod < 0.0) { /* orient perturbed values */ |
| 229 |
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nd.pdot = -nd.pdot; |
| 230 |
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for (i = 0; i < 3; i++) { |
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nd.pnorm[i] = -nd.pnorm[i]; |
| 232 |
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r->pert[i] = -r->pert[i]; |
| 233 |
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} |
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greg |
1.5 |
} |
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greg |
2.6 |
copycolor(nd.mcolor, r->pcol); /* get pattern color */ |
| 236 |
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multcolor(nd.rdiff, nd.mcolor); /* modify diffuse values */ |
| 237 |
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multcolor(nd.tdiff, nd.mcolor); |
| 238 |
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hasrefl = bright(nd.rdiff) > FTINY; |
| 239 |
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hastrans = bright(nd.tdiff) > FTINY; |
| 240 |
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/* load cal file */ |
| 241 |
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nd.dp = NULL; |
| 242 |
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mf = getfunc(m, 9, 0x3f, 0); |
| 243 |
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/* compute transmitted ray */ |
| 244 |
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setbrdfunc(&nd); |
| 245 |
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transtest = 0; |
| 246 |
greg |
2.8 |
transdist = r->rot; |
| 247 |
greg |
2.6 |
errno = 0; |
| 248 |
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setcolor(ctmp, evalue(mf->ep[3]), |
| 249 |
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evalue(mf->ep[4]), |
| 250 |
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evalue(mf->ep[5])); |
| 251 |
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if (errno) |
| 252 |
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objerror(m, WARNING, "compute error"); |
| 253 |
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else if (rayorigin(&sr, r, TRANS, bright(ctmp)) == 0) { |
| 254 |
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if (!(r->crtype & SHADOW) && |
| 255 |
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DOT(r->pert,r->pert) > FTINY*FTINY) { |
| 256 |
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for (i = 0; i < 3; i++) /* perturb direction */ |
| 257 |
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sr.rdir[i] = r->rdir[i] - .75*r->pert[i]; |
| 258 |
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if (normalize(sr.rdir) == 0.0) { |
| 259 |
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objerror(m, WARNING, "illegal perturbation"); |
| 260 |
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VCOPY(sr.rdir, r->rdir); |
| 261 |
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} |
| 262 |
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} else { |
| 263 |
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VCOPY(sr.rdir, r->rdir); |
| 264 |
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transtest = 2; |
| 265 |
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} |
| 266 |
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rayvalue(&sr); |
| 267 |
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multcolor(sr.rcol, ctmp); |
| 268 |
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addcolor(r->rcol, sr.rcol); |
| 269 |
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transtest *= bright(sr.rcol); |
| 270 |
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transdist = r->rot + sr.rt; |
| 271 |
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} |
| 272 |
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if (r->crtype & SHADOW) /* the rest is shadow */ |
| 273 |
greg |
2.10 |
return(1); |
| 274 |
greg |
2.6 |
/* compute reflected ray */ |
| 275 |
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setbrdfunc(&nd); |
| 276 |
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errno = 0; |
| 277 |
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setcolor(ctmp, evalue(mf->ep[0]), |
| 278 |
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evalue(mf->ep[1]), |
| 279 |
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evalue(mf->ep[2])); |
| 280 |
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if (errno) |
| 281 |
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objerror(m, WARNING, "compute error"); |
| 282 |
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else if (rayorigin(&sr, r, REFLECTED, bright(ctmp)) == 0) { |
| 283 |
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for (i = 0; i < 3; i++) |
| 284 |
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sr.rdir[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
| 285 |
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rayvalue(&sr); |
| 286 |
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multcolor(sr.rcol, ctmp); |
| 287 |
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addcolor(r->rcol, sr.rcol); |
| 288 |
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} |
| 289 |
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/* compute ambient */ |
| 290 |
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if (hasrefl) { |
| 291 |
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if (nd.pdot < 0.0) |
| 292 |
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flipsurface(r); |
| 293 |
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ambient(ctmp, r); |
| 294 |
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multcolor(ctmp, nd.rdiff); |
| 295 |
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addcolor(r->rcol, ctmp); /* add to returned color */ |
| 296 |
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if (nd.pdot < 0.0) |
| 297 |
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flipsurface(r); |
| 298 |
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} |
| 299 |
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if (hastrans) { /* from other side */ |
| 300 |
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if (nd.pdot > 0.0) |
| 301 |
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flipsurface(r); |
| 302 |
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ambient(ctmp, r); |
| 303 |
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multcolor(ctmp, nd.tdiff); |
| 304 |
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addcolor(r->rcol, ctmp); |
| 305 |
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if (nd.pdot > 0.0) |
| 306 |
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flipsurface(r); |
| 307 |
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} |
| 308 |
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if (hasrefl | hastrans || m->oargs.sarg[6][0] != '0') |
| 309 |
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direct(r, dirbrdf, &nd); /* add direct component */ |
| 310 |
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/* check distance */ |
| 311 |
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if (transtest > bright(r->rcol)) |
| 312 |
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r->rt = transdist; |
| 313 |
greg |
2.10 |
|
| 314 |
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return(1); |
| 315 |
greg |
2.6 |
} |
| 316 |
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| 317 |
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| 318 |
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| 319 |
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m_brdf2(m, r) /* color a ray which hit a BRDF material */ |
| 320 |
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register OBJREC *m; |
| 321 |
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register RAY *r; |
| 322 |
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{ |
| 323 |
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BRDFDAT nd; |
| 324 |
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COLOR ctmp; |
| 325 |
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double dtmp; |
| 326 |
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/* always a shadow */ |
| 327 |
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if (r->crtype & SHADOW) |
| 328 |
greg |
2.10 |
return(1); |
| 329 |
greg |
2.6 |
/* check arguments */ |
| 330 |
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if (m->oargs.nsargs < (hasdata(m->otype)?4:2) | m->oargs.nfargs < |
| 331 |
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(m->otype==MAT_TFUNC|m->otype==MAT_TDATA?6:4)) |
| 332 |
greg |
1.1 |
objerror(m, USER, "bad # arguments"); |
| 333 |
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nd.mp = m; |
| 334 |
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nd.pr = r; |
| 335 |
greg |
2.6 |
/* get material color */ |
| 336 |
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setcolor(nd.mcolor, m->oargs.farg[0], |
| 337 |
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m->oargs.farg[1], |
| 338 |
|
|
m->oargs.farg[2]); |
| 339 |
greg |
1.5 |
/* get specular component */ |
| 340 |
|
|
nd.rspec = m->oargs.farg[3]; |
| 341 |
greg |
2.6 |
/* compute transmittance */ |
| 342 |
|
|
if (m->otype == MAT_TFUNC | m->otype == MAT_TDATA) { |
| 343 |
greg |
1.5 |
nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
| 344 |
|
|
nd.tspec = nd.trans * m->oargs.farg[5]; |
| 345 |
greg |
2.6 |
dtmp = nd.trans - nd.tspec; |
| 346 |
|
|
setcolor(nd.tdiff, dtmp, dtmp, dtmp); |
| 347 |
|
|
} else { |
| 348 |
|
|
nd.tspec = nd.trans = 0.0; |
| 349 |
|
|
setcolor(nd.tdiff, 0.0, 0.0, 0.0); |
| 350 |
|
|
} |
| 351 |
|
|
/* compute reflectance */ |
| 352 |
|
|
dtmp = 1.0 - nd.trans - nd.rspec; |
| 353 |
|
|
setcolor(nd.rdiff, dtmp, dtmp, dtmp); |
| 354 |
greg |
2.11 |
/* check for back side */ |
| 355 |
|
|
if (r->rod < 0.0) { |
| 356 |
|
|
if (!backvis && m->otype != MAT_TFUNC |
| 357 |
|
|
&& m->otype != MAT_TDATA) { |
| 358 |
|
|
raytrans(r); |
| 359 |
|
|
return(1); |
| 360 |
|
|
} |
| 361 |
|
|
flipsurface(r); /* reorient if backvis */ |
| 362 |
|
|
} |
| 363 |
greg |
1.5 |
/* get modifiers */ |
| 364 |
|
|
raytexture(r, m->omod); |
| 365 |
|
|
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
| 366 |
|
|
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
| 367 |
greg |
2.6 |
multcolor(nd.rdiff, nd.mcolor); |
| 368 |
|
|
multcolor(nd.tdiff, nd.mcolor); |
| 369 |
greg |
1.1 |
/* load auxiliary files */ |
| 370 |
greg |
2.2 |
if (hasdata(m->otype)) { |
| 371 |
greg |
1.1 |
nd.dp = getdata(m->oargs.sarg[1]); |
| 372 |
greg |
2.6 |
getfunc(m, 2, 0, 0); |
| 373 |
greg |
1.1 |
} else { |
| 374 |
|
|
nd.dp = NULL; |
| 375 |
greg |
2.6 |
getfunc(m, 1, 0, 0); |
| 376 |
greg |
1.1 |
} |
| 377 |
|
|
/* compute ambient */ |
| 378 |
greg |
2.6 |
if (nd.trans < 1.0-FTINY) { |
| 379 |
greg |
1.1 |
ambient(ctmp, r); |
| 380 |
greg |
2.6 |
scalecolor(ctmp, 1.0-nd.trans); |
| 381 |
greg |
1.1 |
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
| 382 |
|
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 383 |
greg |
1.5 |
} |
| 384 |
greg |
2.6 |
if (nd.trans > FTINY) { /* from other side */ |
| 385 |
greg |
1.5 |
flipsurface(r); |
| 386 |
|
|
ambient(ctmp, r); |
| 387 |
greg |
2.6 |
scalecolor(ctmp, nd.trans); |
| 388 |
greg |
1.5 |
multcolor(ctmp, nd.mcolor); |
| 389 |
|
|
addcolor(r->rcol, ctmp); |
| 390 |
|
|
flipsurface(r); |
| 391 |
greg |
1.1 |
} |
| 392 |
|
|
/* add direct component */ |
| 393 |
|
|
direct(r, dirbrdf, &nd); |
| 394 |
greg |
2.10 |
|
| 395 |
|
|
return(1); |
| 396 |
greg |
1.10 |
} |
| 397 |
|
|
|
| 398 |
|
|
|
| 399 |
|
|
setbrdfunc(np) /* set up brdf function and variables */ |
| 400 |
|
|
register BRDFDAT *np; |
| 401 |
|
|
{ |
| 402 |
|
|
FVECT vec; |
| 403 |
|
|
|
| 404 |
|
|
if (setfunc(np->mp, np->pr) == 0) |
| 405 |
|
|
return(0); /* it's OK, setfunc says we're done */ |
| 406 |
|
|
/* else (re)assign special variables */ |
| 407 |
|
|
multv3(vec, np->pnorm, funcxf.xfm); |
| 408 |
|
|
varset("NxP", '=', vec[0]/funcxf.sca); |
| 409 |
|
|
varset("NyP", '=', vec[1]/funcxf.sca); |
| 410 |
|
|
varset("NzP", '=', vec[2]/funcxf.sca); |
| 411 |
greg |
1.11 |
varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
| 412 |
|
|
np->pdot >= 1.0 ? 1.0 : np->pdot); |
| 413 |
greg |
1.10 |
varset("CrP", '=', colval(np->mcolor,RED)); |
| 414 |
|
|
varset("CgP", '=', colval(np->mcolor,GRN)); |
| 415 |
|
|
varset("CbP", '=', colval(np->mcolor,BLU)); |
| 416 |
|
|
return(1); |
| 417 |
greg |
1.1 |
} |
