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#ifndef lint
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static const char RCSid[] = "$Id: loadbsdf.c,v 3.13 2021/03/27 17:50:18 greg Exp $";
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#endif
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/*
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* Simple interface for loading BSDF, Radiance-specific search
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*/
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#include "rtio.h"
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#include "rterror.h"
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#include "bsdf.h"
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#include "paths.h"
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/* Convert error from BSDF library */
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char *
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transSDError(SDError ec)
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{
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if (!SDerrorDetail[0])
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return(strcpy(errmsg, SDerrorList[ec]));
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sprintf(errmsg, "%s: %s", SDerrorList[ec], SDerrorDetail);
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return(errmsg);
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}
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/* Make sure we're not over 100% scattering for this component */
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static void
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checkDF(const char *nm, double amt, const SDSpectralDF *dfp, const char *desc)
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{
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if (dfp != NULL)
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amt += dfp->maxHemi;
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if (amt <= 1.01)
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return;
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sprintf(errmsg, "BSDF \"%s\" has %.1f%% %s", nm, amt*100., desc);
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error(WARNING, errmsg);
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}
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/* Load a BSDF file and perform some basic checks */
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SDData *
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loadBSDF(char *fname)
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{
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SDData *sd;
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SDError ec;
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char *pname;
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sd = SDgetCache(fname); /* look up or allocate */
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if (sd == NULL)
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error(SYSTEM, "out of memory in loadBSDF");
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if (SDisLoaded(sd)) /* already in memory? */
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return(sd);
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/* else find and load it */
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pname = getpath(fname, getrlibpath(), R_OK);
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if (pname == NULL) {
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sprintf(errmsg, "cannot find BSDF file \"%s\"", fname);
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error(SYSTEM, errmsg);
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}
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ec = SDloadFile(sd, pname);
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if (ec)
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error(USER, transSDError(ec));
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/* simple checks */
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checkDF(sd->name, sd->rLambFront.cieY, sd->rf, "front reflection");
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checkDF(sd->name, sd->rLambBack.cieY, sd->rb, "rear reflection");
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checkDF(sd->name, sd->tLambFront.cieY, sd->tf, "front transmission");
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checkDF(sd->name, sd->tLambBack.cieY, sd->tb, "back transmission");
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#ifdef DEBUG
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{
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float rgb[3];
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fprintf(stderr, "Loaded BSDF '%s' (file \"%s\")\n", sd->name, pname);
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ccy2rgb(&sd->rLambFront.spec, sd->rLambFront.cieY, rgb);
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fprintf(stderr, "Front diffuse RGB: %.4f %.4f %.4f\n", rgb[0], rgb[1], rgb[2]);
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ccy2rgb(&sd->rLambBack.spec, sd->rLambBack.cieY, rgb);
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fprintf(stderr, "Back diffuse RGB: %.4f %.4f %.4f\n", rgb[0], rgb[1], rgb[2]);
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ccy2rgb(&sd->tLambFront.spec, sd->tLamb.cieY, rgb);
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fprintf(stderr, "Front diffuse RGB transmittance: %.4f %.4f %.4f\n", rgb[0], rgb[1], rgb[2]);
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ccy2rgb(&sd->tLambBack.spec, sd->tLamb.cieY, rgb);
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fprintf(stderr, "Back diffuse RGB transmittance: %.4f %.4f %.4f\n", rgb[0], rgb[1], rgb[2]);
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if (sd->rf)
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fprintf(stderr, "Maximum direct hemispherical front reflection (less diffuse): %.3f%%\n",
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sd->rf->maxHemi*100.);
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if (sd->rb)
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fprintf(stderr, "Maximum direct hemispherical back reflection (less diffuse): %.3f%%\n",
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sd->rb->maxHemi*100.);
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if (sd->tf)
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fprintf(stderr, "Maximum direct hemispherical front transmission (less diffuse): %.3f%%\n",
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sd->tf->maxHemi*100.);
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if (sd->tb)
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fprintf(stderr, "Maximum direct hemispherical back transmission (less diffuse): %.3f%%\n",
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sd->tb->maxHemi*100.);
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}
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#endif
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SDretainSet = SDretainAll; /* keep data in core */
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#ifdef SMLMEM
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SDmaxCache = 5L*1024*1024;
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#else
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SDmaxCache = 250L*1024*1024;
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#endif
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return(sd);
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}
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