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/* Copyright (c) 1998 Silicon Graphics, Inc. */
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#ifndef lint
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static char SCCSid[] = "$SunId$ SGI";
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#endif
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/*
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* mx_data.c - routine for stored mixtures.
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*
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* 11/2/88
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*/
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#include "ray.h"
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#include "data.h"
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#include "func.h"
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/*
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* A stored mixture is specified:
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*
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* modifier mixdata name
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* 6+ foremod backmod func dfname vfname v0 v1 .. xf
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* 0
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* n A1 A2 ..
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*
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* Vfname is the name of the file where the variable definitions
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* can be found. The list of real arguments can be accessed by
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* definitions in the file. Dfname is the data file.
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* The dimensions of the data files and the number
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* of variables must match. The func is a single argument
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* function which returns the corrected data value given the
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* interpolated value from the file. The xf is a transformation
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* to get from the original coordinates to the current coordinates.
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*/
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mx_data(m, r) /* interpolate mixture data */
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register OBJREC *m;
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RAY *r;
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{
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OBJECT obj;
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double coef;
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double pt[MAXDIM];
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DATARRAY *dp;
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OBJECT mod[2];
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register MFUNC *mf;
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register int i;
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if (m->oargs.nsargs < 6)
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objerror(m, USER, "bad # arguments");
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obj = objndx(m);
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for (i = 0; i < 2; i++)
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if (!strcmp(m->oargs.sarg[i], VOIDID))
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mod[i] = OVOID;
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else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
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sprintf(errmsg, "undefined modifier \"%s\"",
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m->oargs.sarg[i]);
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objerror(m, USER, errmsg);
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}
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dp = getdata(m->oargs.sarg[3]);
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i = (1 << dp->nd) - 1;
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mf = getfunc(m, 4, i<<5, 0);
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setfunc(m, r);
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errno = 0;
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for (i = 0; i < dp->nd; i++) {
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pt[i] = evalue(mf->ep[i]);
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if (errno)
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goto computerr;
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}
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coef = datavalue(dp, pt);
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errno = 0;
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coef = funvalue(m->oargs.sarg[2], 1, &coef);
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if (errno)
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goto computerr;
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if (raymixture(r, mod[0], mod[1], coef)) {
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if (m->omod != OVOID)
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objerror(m, USER, "inappropriate modifier");
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return(1);
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}
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return(0);
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computerr:
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objerror(m, WARNING, "compute error");
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return(0);
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}
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