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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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|
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#include "otypes.h" |
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|
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+ |
#include "func.h" |
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+ |
|
| 19 |
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/* |
| 20 |
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* Arguments to this material include the color and specularity. |
| 21 |
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* String arguments include the reflection function and files. |
| 26 |
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* surface can be used to represent an infinitely thin object. |
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* |
| 28 |
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* Arguments for MAT_PFUNC and MAT_MFUNC are: |
| 29 |
< |
* 2+ func funcfile transform .. |
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> |
* 2+ func funcfile transform |
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* 0 |
| 31 |
< |
* 4+ red grn blu specularity args .. |
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> |
* 4+ red grn blu specularity A5 .. |
| 32 |
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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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> |
* 6+ red grn blu rspec trans tspec A7 .. |
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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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*/ |
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|
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– |
extern double funvalue(), varvalue(); |
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– |
|
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typedef struct { |
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OBJREC *mp; /* material pointer */ |
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RAY *pr; /* intersected ray */ |
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DATARRAY *dp; /* data array for PDATA or MDATA */ |
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> |
DATARRAY *dp; /* data array for PDATA, MDATA or TDATA */ |
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COLOR mcolor; /* color of this material */ |
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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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double trans; /* transmissivity */ |
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double tspec; /* specular transmission */ |
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double tdiff; /* diffuse transmission */ |
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FVECT pnorm; /* perturbed surface normal */ |
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double pdot; /* perturbed dot product */ |
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} BRDFDAT; /* BRDF material data */ |
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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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|
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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) |
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if (ldot <= FTINY && ldot >= -FTINY) |
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return; /* too close to grazing */ |
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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) { |
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if (ldot > 0.0 && np->rdiff > FTINY) { |
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/* |
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* Compute and add diffuse reflected component to returned |
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* color. The diffuse reflected component will always be |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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if (np->rspec > FTINY) { |
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if (ldot < 0.0 && np->tdiff > FTINY) { |
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/* |
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* Compute specular component. |
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* Diffuse transmitted component. |
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*/ |
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setfunc(np->mp, np->pr); |
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errno = 0; |
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if (np->dp == NULL) |
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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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copycolor(ctmp, np->mcolor); |
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> |
dtmp = -ldot * omega * np->tdiff / PI; |
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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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> |
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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> |
setbrdfunc(np); |
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> |
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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ldx[i] /= funcxf.sca; |
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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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colval(ctmp,GRN) = colval(ctmp,RED); |
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else |
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colval(ctmp,GRN) = funvalue(sa[7], 3, ldx); |
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if (!strcmp(sa[8],sa[6])) |
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colval(ctmp,BLU) = colval(ctmp,RED); |
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> |
else if (!strcmp(sa[8],sa[7])) |
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colval(ctmp,BLU) = colval(ctmp,GRN); |
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else |
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> |
colval(ctmp,BLU) = funvalue(sa[8], 3, ldx); |
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> |
dtmp = bright(ctmp); |
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> |
} else if (np->dp == NULL) { |
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> |
dtmp = funvalue(sa[0], 3, ldx); |
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> |
setcolor(ctmp, dtmp, dtmp, dtmp); |
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} else { |
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for (i = 0; i < np->dp->nd; i++) |
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> |
pt[i] = funvalue(sa[3+i], 3, ldx); |
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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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} |
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> |
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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> |
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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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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} |
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|
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register OBJREC *m; |
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register RAY *r; |
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{ |
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int minsa, minfa; |
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BRDFDAT nd; |
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< |
double dtmp; |
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> |
double transtest, transdist; |
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COLOR ctmp; |
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double dtmp, tspect, rspecr; |
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MFUNC *mf; |
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register int i; |
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< |
|
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< |
if (m->oargs.nsargs < 2 || m->oargs.nfargs < 4) |
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> |
/* check arguments */ |
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> |
switch (m->otype) { |
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> |
case MAT_PFUNC: case MAT_MFUNC: |
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> |
minsa = 2; minfa = 4; break; |
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case MAT_PDATA: case MAT_MDATA: |
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> |
minsa = 4; minfa = 4; break; |
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case MAT_TFUNC: |
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minsa = 2; minfa = 6; break; |
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> |
case MAT_TDATA: |
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minsa = 4; minfa = 6; break; |
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> |
case MAT_BRTDF: |
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> |
minsa = 10; minfa = 6; break; |
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} |
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> |
if (m->oargs.nsargs < minsa || m->oargs.nfargs < minfa) |
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objerror(m, USER, "bad # arguments"); |
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/* easy shadow test */ |
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if (r->crtype & SHADOW) |
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return; |
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nd.mp = m; |
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nd.pr = r; |
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< |
/* load auxiliary files */ |
| 212 |
< |
if (m->otype == MAT_PDATA || m->otype == MAT_MDATA) { |
| 213 |
< |
nd.dp = getdata(m->oargs.sarg[1]); |
| 214 |
< |
for (i = 3; i < m->oargs.nsargs; i++) |
| 215 |
< |
if (m->oargs.sarg[i][0] == '-') |
| 216 |
< |
break; |
| 217 |
< |
if (i-3 != nd.dp->nd) |
| 218 |
< |
objerror(m, USER, "dimension error"); |
| 219 |
< |
if (!fundefined(m->oargs.sarg[3])) |
| 220 |
< |
loadfunc(m->oargs.sarg[2]); |
| 221 |
< |
} else { |
| 222 |
< |
nd.dp = NULL; |
| 223 |
< |
if (!fundefined(m->oargs.sarg[0])) |
| 224 |
< |
loadfunc(m->oargs.sarg[1]); |
| 225 |
< |
} |
| 211 |
> |
/* get specular component */ |
| 212 |
> |
nd.rspec = m->oargs.farg[3]; |
| 213 |
> |
/* compute transmission */ |
| 214 |
> |
if (m->otype == MAT_TFUNC || m->otype == MAT_TDATA |
| 215 |
> |
|| m->otype == MAT_BRTDF) { |
| 216 |
> |
nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
| 217 |
> |
nd.tspec = nd.trans * m->oargs.farg[5]; |
| 218 |
> |
nd.tdiff = nd.trans - nd.tspec; |
| 219 |
> |
} else |
| 220 |
> |
nd.tdiff = nd.tspec = nd.trans = 0.0; |
| 221 |
> |
/* early shadow check */ |
| 222 |
> |
if (r->crtype & SHADOW && (m->otype != MAT_BRTDF || nd.tspec <= FTINY)) |
| 223 |
> |
return; |
| 224 |
> |
/* diffuse reflection */ |
| 225 |
> |
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
| 226 |
|
/* get material color */ |
| 227 |
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setcolor(nd.mcolor, m->oargs.farg[0], |
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m->oargs.farg[1], |
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m->oargs.farg[2]); |
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< |
/* get roughness */ |
| 230 |
> |
/* fix orientation */ |
| 231 |
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if (r->rod < 0.0) |
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flipsurface(r); |
| 233 |
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/* get modifiers */ |
| 234 |
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raytexture(r, m->omod); |
| 235 |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
| 236 |
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multcolor(nd.mcolor, r->pcol); /* modify material color */ |
| 237 |
< |
r->rt = r->rot; /* default ray length */ |
| 238 |
< |
/* get specular component */ |
| 239 |
< |
nd.rspec = m->oargs.farg[3]; |
| 240 |
< |
|
| 241 |
< |
if (nd.rspec > FTINY) { /* has specular component */ |
| 242 |
< |
/* compute specular color */ |
| 243 |
< |
if (m->otype == MAT_MFUNC || m->otype == MAT_MDATA) |
| 244 |
< |
copycolor(nd.scolor, nd.mcolor); |
| 245 |
< |
else |
| 246 |
< |
setcolor(nd.scolor, 1.0, 1.0, 1.0); |
| 247 |
< |
scalecolor(nd.scolor, nd.rspec); |
| 237 |
> |
transtest = 0; |
| 238 |
> |
/* load auxiliary files */ |
| 239 |
> |
if (hasdata(m->otype)) { |
| 240 |
> |
nd.dp = getdata(m->oargs.sarg[1]); |
| 241 |
> |
i = (1 << nd.dp->nd) - 1; |
| 242 |
> |
mf = getfunc(m, 2, i<<3, 0); |
| 243 |
> |
} else if (m->otype == MAT_BRTDF) { |
| 244 |
> |
nd.dp = NULL; |
| 245 |
> |
mf = getfunc(m, 9, 0x3f, 0); |
| 246 |
> |
} else { |
| 247 |
> |
nd.dp = NULL; |
| 248 |
> |
mf = getfunc(m, 1, 0, 0); |
| 249 |
|
} |
| 250 |
< |
/* diffuse reflection */ |
| 251 |
< |
nd.rdiff = 1.0 - nd.rspec; |
| 250 |
> |
/* set special variables */ |
| 251 |
> |
setbrdfunc(&nd); |
| 252 |
> |
/* compute transmitted ray */ |
| 253 |
> |
tspect = 0.; |
| 254 |
> |
if (m->otype == MAT_BRTDF && nd.tspec > FTINY) { |
| 255 |
> |
RAY sr; |
| 256 |
> |
errno = 0; |
| 257 |
> |
setcolor(ctmp, evalue(mf->ep[3]), |
| 258 |
> |
evalue(mf->ep[4]), |
| 259 |
> |
evalue(mf->ep[5])); |
| 260 |
> |
scalecolor(ctmp, nd.trans); |
| 261 |
> |
if (errno) |
| 262 |
> |
objerror(m, WARNING, "compute error"); |
| 263 |
> |
else if ((tspect = bright(ctmp)) > FTINY && |
| 264 |
> |
rayorigin(&sr, r, TRANS, tspect) == 0) { |
| 265 |
> |
if (!(r->crtype & SHADOW) && |
| 266 |
> |
DOT(r->pert,r->pert) > FTINY*FTINY) { |
| 267 |
> |
for (i = 0; i < 3; i++) /* perturb direction */ |
| 268 |
> |
sr.rdir[i] = r->rdir[i] - |
| 269 |
> |
.75*r->pert[i]; |
| 270 |
> |
normalize(sr.rdir); |
| 271 |
> |
} else { |
| 272 |
> |
VCOPY(sr.rdir, r->rdir); |
| 273 |
> |
transtest = 2; |
| 274 |
> |
} |
| 275 |
> |
rayvalue(&sr); |
| 276 |
> |
multcolor(sr.rcol, ctmp); |
| 277 |
> |
addcolor(r->rcol, sr.rcol); |
| 278 |
> |
transtest *= bright(sr.rcol); |
| 279 |
> |
transdist = r->rot + sr.rt; |
| 280 |
> |
} |
| 281 |
> |
} |
| 282 |
> |
if (r->crtype & SHADOW) /* the rest is shadow */ |
| 283 |
> |
return; |
| 284 |
> |
/* compute reflected ray */ |
| 285 |
> |
rspecr = 0.; |
| 286 |
> |
if (m->otype == MAT_BRTDF && nd.rspec > FTINY) { |
| 287 |
> |
RAY sr; |
| 288 |
> |
errno = 0; |
| 289 |
> |
setcolor(ctmp, evalue(mf->ep[0]), |
| 290 |
> |
evalue(mf->ep[1]), |
| 291 |
> |
evalue(mf->ep[2])); |
| 292 |
> |
if (errno) |
| 293 |
> |
objerror(m, WARNING, "compute error"); |
| 294 |
> |
else if ((rspecr = bright(ctmp)) > FTINY && |
| 295 |
> |
rayorigin(&sr, r, REFLECTED, rspecr) == 0) { |
| 296 |
> |
for (i = 0; i < 3; i++) |
| 297 |
> |
sr.rdir[i] = r->rdir[i] + |
| 298 |
> |
2.0*nd.pdot*nd.pnorm[i]; |
| 299 |
> |
rayvalue(&sr); |
| 300 |
> |
multcolor(sr.rcol, ctmp); |
| 301 |
> |
addcolor(r->rcol, sr.rcol); |
| 302 |
> |
} |
| 303 |
> |
} |
| 304 |
|
/* compute ambient */ |
| 305 |
< |
if (nd.rdiff > FTINY) { |
| 305 |
> |
if ((dtmp = 1.0-nd.trans-rspecr) > FTINY) { |
| 306 |
|
ambient(ctmp, r); |
| 307 |
+ |
scalecolor(ctmp, dtmp); |
| 308 |
|
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
| 309 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 310 |
|
} |
| 311 |
+ |
if ((dtmp = nd.trans-tspect) > FTINY) { /* from other side */ |
| 312 |
+ |
flipsurface(r); |
| 313 |
+ |
ambient(ctmp, r); |
| 314 |
+ |
scalecolor(ctmp, dtmp); |
| 315 |
+ |
multcolor(ctmp, nd.mcolor); |
| 316 |
+ |
addcolor(r->rcol, ctmp); |
| 317 |
+ |
flipsurface(r); |
| 318 |
+ |
} |
| 319 |
|
/* add direct component */ |
| 320 |
|
direct(r, dirbrdf, &nd); |
| 321 |
+ |
/* check distance */ |
| 322 |
+ |
if (transtest > bright(r->rcol)) |
| 323 |
+ |
r->rt = transdist; |
| 324 |
+ |
} |
| 325 |
+ |
|
| 326 |
+ |
|
| 327 |
+ |
setbrdfunc(np) /* set up brdf function and variables */ |
| 328 |
+ |
register BRDFDAT *np; |
| 329 |
+ |
{ |
| 330 |
+ |
FVECT vec; |
| 331 |
+ |
|
| 332 |
+ |
if (setfunc(np->mp, np->pr) == 0) |
| 333 |
+ |
return(0); /* it's OK, setfunc says we're done */ |
| 334 |
+ |
/* else (re)assign special variables */ |
| 335 |
+ |
multv3(vec, np->pnorm, funcxf.xfm); |
| 336 |
+ |
varset("NxP", '=', vec[0]/funcxf.sca); |
| 337 |
+ |
varset("NyP", '=', vec[1]/funcxf.sca); |
| 338 |
+ |
varset("NzP", '=', vec[2]/funcxf.sca); |
| 339 |
+ |
varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
| 340 |
+ |
np->pdot >= 1.0 ? 1.0 : np->pdot); |
| 341 |
+ |
varset("CrP", '=', colval(np->mcolor,RED)); |
| 342 |
+ |
varset("CgP", '=', colval(np->mcolor,GRN)); |
| 343 |
+ |
varset("CbP", '=', colval(np->mcolor,BLU)); |
| 344 |
+ |
return(1); |
| 345 |
|
} |
