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#ifndef lint |
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static const char RCSid[] = "$Id: m_direct.c,v 2.17 2023/11/15 18:02:53 greg Exp $"; |
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#endif |
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/* |
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* Routines for light-redirecting materials and |
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* their associated virtual light sources |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "ray.h" |
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#include "otypes.h" |
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#include "rtotypes.h" |
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#include "source.h" |
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#include "func.h" |
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|
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/* |
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* The arguments for MAT_DIRECT1 are: |
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* |
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* 5+ coef1 dx1 dy1 dz1 funcfile transform.. |
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* 0 |
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* n A1 A2 .. An |
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* |
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* The arguments for MAT_DIRECT2 are: |
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* |
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* 9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform.. |
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* 0 |
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* n A1 A2 .. An |
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*/ |
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|
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static int redirect(OBJREC *m, RAY *r, int n); |
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static int dir_proj(MAT4 pm, OBJREC *o, SRCREC *s, int n); |
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|
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VSMATERIAL direct1_vs = {dir_proj, 1}; |
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VSMATERIAL direct2_vs = {dir_proj, 2}; |
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|
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#define getdfunc(m) ( (m)->otype == MAT_DIRECT1 ? \ |
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getfunc(m, 4, 0xf, 1) : \ |
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getfunc(m, 8, 0xff, 1) ) |
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|
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|
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int |
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m_direct( /* shade redirected ray */ |
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OBJREC *m, |
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RAY *r |
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) |
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{ |
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/* check if source ray */ |
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if (r->rsrc >= 0 && source[r->rsrc].so != r->ro) |
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return(1); /* got the wrong guy */ |
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/* compute first projection */ |
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if (m->otype == MAT_DIRECT1 || |
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(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 0)) |
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redirect(m, r, 0); |
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/* compute second projection */ |
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if (m->otype == MAT_DIRECT2 && |
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(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 1)) |
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redirect(m, r, 1); |
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return(1); |
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} |
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|
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|
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static int |
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redirect( /* compute n'th ray redirection */ |
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OBJREC *m, |
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RAY *r, |
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int n |
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) |
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{ |
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MFUNC *mf; |
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EPNODE **va; |
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FVECT nsdir; |
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RAY nr; |
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double coef; |
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int j; |
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/* set up function */ |
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mf = getdfunc(m); |
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setfunc(m, r); |
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/* assign direction variable */ |
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if (r->rsrc >= 0) { |
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SRCREC *sp = source + source[r->rsrc].sa.sv.sn; |
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|
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if (sp->sflags & SDISTANT) |
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VCOPY(nsdir, sp->sloc); |
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else { |
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for (j = 0; j < 3; j++) |
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nsdir[j] = sp->sloc[j] - r->rop[j]; |
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normalize(nsdir); |
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} |
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multv3(nsdir, nsdir, funcxf.xfm); |
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varset("DxA", '=', nsdir[0]/funcxf.sca); |
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varset("DyA", '=', nsdir[1]/funcxf.sca); |
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varset("DzA", '=', nsdir[2]/funcxf.sca); |
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} else { |
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varset("DxA", '=', 0.0); |
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varset("DyA", '=', 0.0); |
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varset("DzA", '=', 0.0); |
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} |
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/* compute coefficient */ |
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errno = 0; |
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va = mf->ep + 4*n; |
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coef = evalue(va[0]); |
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if ((errno == EDOM) | (errno == ERANGE)) |
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goto computerr; |
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setscolor(nr.rcoef, coef, coef, coef); |
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if (rayorigin(&nr, TRANS, r, nr.rcoef) < 0) |
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return(0); |
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va++; /* compute direction */ |
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for (j = 0; j < 3; j++) { |
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nr.rdir[j] = evalue(va[j]); |
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if ((errno == EDOM) | (errno == ERANGE)) |
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goto computerr; |
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} |
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if (mf->fxp != &unitxf) |
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multv3(nr.rdir, nr.rdir, mf->fxp->xfm); |
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if (r->rox != NULL) |
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multv3(nr.rdir, nr.rdir, r->rox->f.xfm); |
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if (normalize(nr.rdir) == 0.0) |
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goto computerr; |
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/* compute value */ |
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if (r->rsrc >= 0) |
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nr.rsrc = source[r->rsrc].sa.sv.sn; |
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rayvalue(&nr); |
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smultscolor(nr.rcol, nr.rcoef); |
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saddscolor(r->rcol, nr.rcol); |
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if (r->ro != NULL && isflat(r->ro->otype)) |
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r->rxt = r->rot + raydistance(&nr); |
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return(1); |
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computerr: |
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objerror(m, WARNING, "compute error"); |
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return(-1); |
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} |
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|
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|
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static int |
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dir_proj( /* compute a director's projection */ |
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MAT4 pm, |
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OBJREC *o, |
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SRCREC *s, |
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int n |
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) |
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{ |
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RAY tr; |
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OBJREC *m; |
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MFUNC *mf; |
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EPNODE **va; |
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FVECT cent, newdir, nv, h; |
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double coef, olddot, newdot, od; |
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int i, j; |
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/* initialize test ray */ |
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getmaxdisk(cent, o); |
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if (s->sflags & SDISTANT) |
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for (i = 0; i < 3; i++) { |
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tr.rdir[i] = -s->sloc[i]; |
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tr.rorg[i] = cent[i] - tr.rdir[i]; |
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} |
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else { |
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for (i = 0; i < 3; i++) { |
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tr.rdir[i] = cent[i] - s->sloc[i]; |
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tr.rorg[i] = s->sloc[i]; |
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} |
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if (normalize(tr.rdir) == 0.0) |
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return(0); /* at source! */ |
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} |
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od = getplaneq(nv, o); |
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olddot = DOT(tr.rdir, nv); |
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if (olddot <= FTINY && olddot >= -FTINY) |
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return(0); /* old dir parallels plane */ |
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tr.rmax = 0.0; |
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rayorigin(&tr, PRIMARY, NULL, NULL); |
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if (!(*ofun[o->otype].funp)(o, &tr)) |
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return(0); /* no intersection! */ |
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/* compute redirection */ |
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m = vsmaterial(o); |
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mf = getdfunc(m); |
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setfunc(m, &tr); |
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varset("DxA", '=', 0.0); |
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varset("DyA", '=', 0.0); |
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varset("DzA", '=', 0.0); |
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errno = 0; |
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va = mf->ep + 4*n; |
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coef = evalue(va[0]); |
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if ((errno == EDOM) | (errno == ERANGE)) |
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goto computerr; |
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if (coef <= FTINY) |
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return(0); /* insignificant */ |
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va++; |
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for (i = 0; i < 3; i++) { |
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newdir[i] = evalue(va[i]); |
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if ((errno == EDOM) | (errno == ERANGE)) |
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goto computerr; |
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} |
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if (mf->fxp != &unitxf) |
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multv3(newdir, newdir, mf->fxp->xfm); |
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/* normalization unnecessary */ |
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newdot = DOT(newdir, nv); |
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if (newdot <= FTINY && newdot >= -FTINY) |
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return(0); /* new dir parallels plane */ |
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/* everything OK -- compute shear */ |
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for (i = 0; i < 3; i++) |
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h[i] = newdir[i]/newdot - tr.rdir[i]/olddot; |
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setident4(pm); |
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for (j = 0; j < 3; j++) { |
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for (i = 0; i < 3; i++) |
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pm[i][j] += nv[i]*h[j]; |
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pm[3][j] = -od*h[j]; |
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} |
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if ((newdot > 0.0) ^ (olddot > 0.0)) /* add mirroring */ |
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for (j = 0; j < 3; j++) { |
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for (i = 0; i < 3; i++) |
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pm[i][j] -= 2.*nv[i]*nv[j]; |
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pm[3][j] += 2.*od*nv[j]; |
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} |
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return(1); |
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computerr: |
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objerror(m, WARNING, "projection compute error"); |
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return(0); |
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} |
