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- /* Copyright (c) 1991 Regents of the University of California */
-
- #ifndef lint
- static char SCCSid[] = "@(#)mx_data.c 2.2 11/25/91 LBL";
- #endif
-
- /*
- * mx_data.c - routine for stored mixtures.
- *
- * 11/2/88
- */
-
- #include "ray.h"
-
- #include "data.h"
-
- #include "func.h"
-
- /*
- * A stored mixture is specified:
- *
- * modifier mixdata name
- * 6+ foremod backmod func dfname vfname v0 v1 .. xf
- * 0
- * n A1 A2 ..
- *
- * Vfname is the name of the file where the variable definitions
- * can be found. The list of real arguments can be accessed by
- * definitions in the file. Dfname is the data file.
- * The dimensions of the data files and the number
- * of variables must match. The func is a single argument
- * function which returns the corrected data value given the
- * interpolated value from the file. The xf is a transformation
- * to get from the original coordinates to the current coordinates.
- */
-
-
- mx_data(m, r) /* interpolate mixture data */
- register OBJREC *m;
- RAY *r;
- {
- double coef;
- double pt[MAXDIM];
- DATARRAY *dp;
- OBJECT mod[2];
- register MFUNC *mf;
- register int i;
-
- if (m->oargs.nsargs < 6)
- objerror(m, USER, "bad # arguments");
- for (i = 0; i < 2; i++)
- if (!strcmp(m->oargs.sarg[i], VOIDID))
- mod[i] = OVOID;
- else if ((mod[i] = modifier(m->oargs.sarg[i])) == OVOID) {
- sprintf(errmsg, "undefined modifier \"%s\"",
- m->oargs.sarg[i]);
- objerror(m, USER, errmsg);
- }
- dp = getdata(m->oargs.sarg[3]);
- i = (1 << dp->nd) - 1;
- mf = getfunc(m, 4, i<<5, 0);
- setfunc(m, r);
- errno = 0;
- for (i = 0; i < dp->nd; i++) {
- pt[i] = evalue(mf->ep[i]);
- if (errno)
- goto computerr;
- }
- coef = datavalue(dp, pt);
- errno = 0;
- coef = funvalue(m->oargs.sarg[2], 1, &coef);
- if (errno)
- goto computerr;
- raymixture(r, mod[0], mod[1], coef);
- return;
- computerr:
- objerror(m, WARNING, "compute error");
- }
-