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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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* Routines for light-redirecting materials and |
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* their associated virtual light sources |
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*/ |
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#include "ray.h" |
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#include "copyright.h" |
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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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* n A1 A2 .. An |
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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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int dir_proj(); |
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VSMATERIAL direct1_vs = {dir_proj, 1}; |
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VSMATERIAL direct2_vs = {dir_proj, 2}; |
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getfunc(m, 8, 0xff, 1) ) |
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m_direct(m, r) /* shade redirected ray */ |
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register OBJREC *m; |
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register RAY *r; |
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extern int |
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m_direct( /* shade redirected ray */ |
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register OBJREC *m, |
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register 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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} |
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redirect(m, r, n) /* 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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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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register EPNODE **va; |
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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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if (r->rox != NULL) |
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multv3(nsdir, nsdir, r->rox->b.xfm); |
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if (mf->b != &unitxf) |
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multv3(nsdir, nsdir, mf->b->xfm); |
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} else |
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nsdir[0] = nsdir[1] = nsdir[2] = 0.0; |
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varset("DxA", '=', nsdir[0]); |
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varset("DyA", '=', nsdir[1]); |
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varset("DzA", '=', nsdir[2]); |
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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) |
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if ((errno == EDOM) | (errno == ERANGE)) |
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goto computerr; |
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if (coef <= FTINY || rayorigin(&nr, r, TRANS, coef) < 0) |
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setcolor(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) |
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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->f != &unitxf) |
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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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scalecolor(nr.rcol, coef); |
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multcolor(nr.rcol, nr.rcoef); |
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addcolor(r->rcol, nr.rcol); |
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if (r->ro != NULL && isflat(r->ro->otype)) |
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r->rt = r->rot + nr.rt; |
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return(1); |
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computerr: |
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objerror(m, WARNING, "compute error"); |
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} |
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dir_proj(pm, o, s, n) /* 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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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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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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rayorigin(&tr, NULL, PRIMARY, 1.0); |
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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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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) |
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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) |
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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->f != &unitxf) |
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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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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]; |
