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/* Copyright (c) 1991 Regents of the University of California */ |
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/* Copyright (c) 1992 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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#define LCALSUF 4 |
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XF unitxf = { /* identity transform */ |
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1.0, 0.0, 0.0, 0.0, |
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0.0, 1.0, 0.0, 0.0, |
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0.0, 0.0, 1.0, 0.0, |
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0.0, 0.0, 0.0, 1.0, |
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{{1.0, 0.0, 0.0, 0.0}, |
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{0.0, 1.0, 0.0, 0.0}, |
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{0.0, 0.0, 1.0, 0.0}, |
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{0.0, 0.0, 0.0, 1.0}}, |
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1.0 |
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}; |
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/* check to see if done already */ |
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if ((f = (MFUNC *)m->os) != NULL) |
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return(f); |
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fobj = NULL; fray = NULL; |
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if (initfile[0]) { /* initialize on first call */ |
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setcontext(""); |
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scompile("Dx=$1;Dy=$2;Dz=$3;", NULL, 0); |
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scompile("Nx=$4;Ny=$5;Nz=$6;", NULL, 0); |
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scompile("Px=$7;Py=$8;Pz=$9;", NULL, 0); |
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scompile("T=$10;Rdot=$11;", NULL, 0); |
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scompile("T=$10;Ts=$25;Rdot=$11;", NULL, 0); |
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scompile("S=$12;Tx=$13;Ty=$14;Tz=$15;", NULL, 0); |
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scompile("Ix=$16;Iy=$17;Iz=$18;", NULL, 0); |
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scompile("Jx=$19;Jy=$20;Jz=$21;", NULL, 0); |
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if (i == 1 && arg[ff][0] == '.') |
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setcontext(f->ctx = ""); /* "." means no file */ |
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else { |
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strcpy(sbuf,m->oargs.sarg[ff]); /* file name is context */ |
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strcpy(sbuf,arg[ff]); /* file name is context */ |
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if (i > LCALSUF && !strcmp(sbuf+i-LCALSUF, CALSUF)) |
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sbuf[i-LCALSUF] = '\0'; /* remove suffix */ |
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setcontext(f->ctx = savestr(sbuf)); |
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if (!vardefined(REFVNAME)) { /* file loaded? */ |
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loadfunc(m->oargs.sarg[ff]); |
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loadfunc(arg[ff]); |
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varset(REFVNAME, '=', 1.0); |
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} else /* reference_count++ */ |
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varset(REFVNAME, '=', varvalue(REFVNAME)+1.0); |
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m->os = (char *)f; |
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return(f); |
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toofew: |
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objerror(m, USER, "too few arguments"); |
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objerror(m, USER, "too few string arguments"); |
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memerr: |
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error(SYSTEM, "out of memory in getfunc"); |
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} |
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extern double argument(); |
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register int n; |
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if (fobj == NULL) |
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syntax("arg(n) used in constant expression"); |
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n = argument(1) + .5; /* round to integer */ |
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if (n < 1) |
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double sum; |
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register RAY *r; |
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if (fray == NULL) |
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syntax("ray parameter used in constant expression"); |
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if (--n < 0) |
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goto badchan; |
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fray->rop[2]*funcxf.xfm[2][n-6] + |
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funcxf.xfm[3][n-6] ); |
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if (n == 9) { /* distance */ |
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if (n == 9) { /* total distance */ |
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sum = fray->rot; |
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for (r = fray->parent; r != NULL; r = r->parent) |
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sum += r->rot; |
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return(sum * funcxf.sca); |
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} |
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if (n == 10) /* dot product (range [-1,1]) */ |
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return( fray->rod <= -1.0 ? -1.0 : |
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fray->rod >= 1.0 ? 1.0 : |
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if (n < 24) /* k unit vector */ |
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return(funcxf.xfm[2][n-21] / funcxf.sca); |
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if (n == 24) { /* single ray (shadow) distance */ |
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sum = fray->rot; |
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for (r = fray->parent; r != NULL && r->crtype&SHADOW; |
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r = r->parent) |
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sum += r->rot; |
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return(sum * funcxf.sca); |
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} |
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badchan: |
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error(USER, "illegal channel number"); |
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} |
