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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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|
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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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/* |
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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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|
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#include "ray.h" |
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|
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#include "data.h" |
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|
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#include "func.h" |
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|
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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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|
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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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|
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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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} |
