--- ray/src/common/bsdf.c	2015/02/08 22:14:50	2.50
+++ ray/src/common/bsdf.c	2017/02/02 04:46:38	2.53
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: bsdf.c,v 2.50 2015/02/08 22:14:50 greg Exp $";
+static const char RCSid[] = "$Id: bsdf.c,v 2.53 2017/02/02 04:46:38 greg Exp $";
 #endif
 /*
  *  bsdf.c
@@ -422,6 +422,7 @@ SDcacheFile(const char *fname)
 	if (fname == NULL || !*fname)
 		return NULL;
 	SDerrorDetail[0] = '\0';
+	/* PLACE MUTEX LOCK HERE FOR THREAD-SAFE */
 	if ((sd = SDgetCache(fname)) == NULL) {
 		SDreportError(SDEmemory, stderr);
 		return NULL;
@@ -429,8 +430,9 @@ SDcacheFile(const char *fname)
 	if (!SDisLoaded(sd) && (ec = SDloadFile(sd, fname))) {
 		SDreportError(ec, stderr);
 		SDfreeCache(sd);
-		return NULL;
+		sd = NULL;
 	}
+	/* END MUTEX LOCK */
 	return sd;
 }
 
@@ -494,7 +496,7 @@ SDsampComponent(SDValue *sv, FVECT ioVec, double randX
 		sv->cieY = cd->cTotal;
 	if (sv->cieY <= 1e-6) {		/* nothing to sample? */
 		sv->spec = c_dfcolor;
-		memset(ioVec, 0, 3*sizeof(double));
+		memset(ioVec, 0, sizeof(FVECT));
 		return SDEnone;
 	}
 					/* compute sample direction */
@@ -595,11 +597,12 @@ SDsizeBSDF(double *projSA, const FVECT v1, const RREAL
 		rdf = sd->rb;
 		tdf = (sd->tb != NULL) ? sd->tb : sd->tf;
 	}
-	if (v2 != NULL)			/* bidirectional? */
+	if (v2 != NULL) {		/* bidirectional? */
 		if (v1[2] > 0 ^ v2[2] > 0)
 			rdf = NULL;
 		else
 			tdf = NULL;
+	}
 	ec = SDEdata;			/* run through components */
 	for (i = (rdf==NULL) ? 0 : rdf->ncomp; i--; ) {
 		ec = (*rdf->comp[i].func->queryProjSA)(projSA, v1, v2,
@@ -767,7 +770,7 @@ SDsampBSDF(SDValue *sv, FVECT ioVec, double randX, int
 	}
 	if (sv->cieY <= 1e-6) {		/* anything to sample? */
 		sv->cieY = .0;
-		memset(ioVec, 0, 3*sizeof(double));
+		memset(ioVec, 0, sizeof(FVECT));
 		return SDEnone;
 	}
 					/* scale random variable */