--- ray/src/util/dctimestep.c	2011/04/03 03:06:19	2.14
+++ ray/src/util/dctimestep.c	2022/03/11 02:44:33	2.49
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: dctimestep.c,v 2.14 2011/04/03 03:06:19 greg Exp $";
+static const char RCSid[] = "$Id: dctimestep.c,v 2.49 2022/03/11 02:44:33 greg Exp $";
 #endif
 /*
  * Compute time-step result using Daylight Coefficient method.
@@ -8,359 +8,48 @@ static const char RCSid[] = "$Id: dctimestep.c,v 2.14 
  */
 
 #include <ctype.h>
+#include "platform.h"
 #include "standard.h"
+#include "cmatrix.h"
 #include "platform.h"
-#include "color.h"
 #include "resolu.h"
-#include "bsdf.h"
 
 char	*progname;			/* global argv[0] */
 
-/* Data types for file loading */
-enum {DTfromHeader, DTascii, DTfloat, DTdouble, DTrgbe, DTxyze};
-
-/* A color coefficient matrix -- vectors have ncols==1 */
-typedef struct {
-	int	nrows, ncols;
-	COLORV	cmem[3];		/* extends struct */
-} CMATRIX;
-
-#define COLSPEC	(sizeof(COLORV)==sizeof(float) ? "%f %f %f" : "%lf %lf %lf")
-
-#define cm_lval(cm,r,c)	((cm)->cmem + 3*((r)*(cm)->ncols + (c)))
-
-#define cv_lval(cm,i)	((cm)->cmem + 3*(i))
-
-/* Allocate a color coefficient matrix */
-static CMATRIX *
-cm_alloc(int nrows, int ncols)
-{
-	CMATRIX	*cm;
-
-	if ((nrows <= 0) | (ncols <= 0))
-		error(USER, "attempt to create empty matrix");
-	cm = (CMATRIX *)malloc(sizeof(CMATRIX) +
-				3*sizeof(COLORV)*(nrows*ncols - 1));
-	if (cm == NULL)
-		error(SYSTEM, "out of memory in cm_alloc()");
-	cm->nrows = nrows;
-	cm->ncols = ncols;
-	return(cm);
-}
-
-#define cm_free(cm)	free(cm)
-
-/* Resize color coefficient matrix */
-static CMATRIX *
-cm_resize(CMATRIX *cm, int nrows)
-{
-	if (nrows == cm->nrows)
-		return(cm);
-	if (nrows <= 0) {
-		cm_free(cm);
-		return(NULL);
-	}
-	cm = (CMATRIX *)realloc(cm, sizeof(CMATRIX) +
-			3*sizeof(COLORV)*(nrows*cm->ncols - 1));
-	if (cm == NULL)
-		error(SYSTEM, "out of memory in cm_resize()");
-	cm->nrows = nrows;
-	return(cm);
-}
-
-/* Load header to obtain data type */
+/* Sum together a set of images and write result to fout */
 static int
-getDT(char *s, void *p)
-{
-	char	fmt[32];
-	
-	if (formatval(fmt, s)) {
-		if (!strcmp(fmt, "ascii"))
-			*((int *)p) = DTascii;
-		else if (!strcmp(fmt, "float"))
-			*((int *)p) = DTfloat;
-		else if (!strcmp(fmt, "double"))
-			*((int *)p) = DTdouble;
-		else if (!strcmp(fmt, COLRFMT))
-			*((int *)p) = DTrgbe;
-		else if (!strcmp(fmt, CIEFMT))
-			*((int *)p) = DTxyze;
-	}
-	return(0);
-}
-
-static int
-getDTfromHeader(FILE *fp)
-{
-	int	dt = DTfromHeader;
-	
-	if (getheader(fp, getDT, &dt) < 0)
-		error(SYSTEM, "header read error");
-	if (dt == DTfromHeader)
-		error(USER, "missing data format in header");
-	return(dt);
-}
-
-/* Allocate and load a matrix from the given file (or stdin if NULL) */
-static CMATRIX *
-cm_load(const char *fname, int nrows, int ncols, int dtype)
-{
-	CMATRIX	*cm;
-	FILE	*fp = stdin;
-
-	if (ncols <= 0)
-		error(USER, "Non-positive number of columns");
-	if (fname == NULL)
-		fname = "<stdin>";
-	else if ((fp = fopen(fname, "r")) == NULL) {
-		sprintf(errmsg, "cannot open file '%s'", fname);
-		error(SYSTEM, errmsg);
-	}
-	if (dtype != DTascii)
-		SET_FILE_BINARY(fp);
-	if (dtype == DTfromHeader)
-		dtype = getDTfromHeader(fp);
-	switch (dtype) {
-	case DTascii:
-	case DTfloat:
-	case DTdouble:
-		break;
-	default:
-		error(USER, "unexpected data type in cm_load()");
-	}
-	if (nrows <= 0) {			/* don't know length? */
-		int	guessrows = 147;	/* usually big enough */
-		if ((dtype != DTascii) & (fp != stdin)) {
-			long	startpos = ftell(fp);
-			if (fseek(fp, 0L, SEEK_END) == 0) {
-				long	endpos = ftell(fp);
-				long	elemsiz = 3*(dtype==DTfloat ?
-					    sizeof(float) : sizeof(double));
-
-				if ((endpos - startpos) % (ncols*elemsiz)) {
-					sprintf(errmsg,
-					"improper length for binary file '%s'",
-							fname);
-					error(USER, errmsg);
-				}
-				guessrows = (endpos - startpos)/(ncols*elemsiz);
-				if (fseek(fp, startpos, SEEK_SET) < 0) {
-					sprintf(errmsg,
-						"fseek() error on file '%s'",
-							fname);
-					error(SYSTEM, errmsg);
-				}
-				nrows = guessrows;	/* we're confident */
-			}
-		}
-		cm = cm_alloc(guessrows, ncols);
-	} else
-		cm = cm_alloc(nrows, ncols);
-	if (cm == NULL)
-		return(NULL);
-	if (dtype == DTascii) {				/* read text file */
-		int	maxrow = (nrows > 0 ? nrows : 32000);
-		int	r, c;
-		for (r = 0; r < maxrow; r++) {
-		    if (r >= cm->nrows)			/* need more space? */
-			cm = cm_resize(cm, 2*cm->nrows);
-		    for (c = 0; c < ncols; c++) {
-		        COLORV	*cv = cm_lval(cm,r,c);
-			if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3)
-				if ((nrows <= 0) & (r > 0) & !c) {
-					cm = cm_resize(cm, maxrow=r);
-					break;
-				} else
-					goto EOFerror;
-		    }
-		}
-		while ((c = getc(fp)) != EOF)
-			if (!isspace(c)) {
-				sprintf(errmsg,
-				"unexpected data at end of ascii file %s",
-						fname);
-				error(WARNING, errmsg);
-				break;
-			}
-	} else {					/* read binary file */
-		if (sizeof(COLORV) == (dtype==DTfloat ? sizeof(float) :
-							sizeof(double))) {
-			int	nread = 0;
-			do {				/* read all we can */
-				nread += fread(cm->cmem + 3*nread,
-						3*sizeof(COLORV),
-						cm->nrows*cm->ncols - nread,
-						fp);
-				if (nrows <= 0) {	/* unknown length */
-					if (nread == cm->nrows*cm->ncols)
-							/* need more space? */
-						cm = cm_resize(cm, 2*cm->nrows);
-					else if (nread && !(nread % cm->ncols))
-							/* seem to be  done */
-						cm = cm_resize(cm, nread/cm->ncols);
-					else		/* ended mid-row */
-						goto EOFerror;
-				} else if (nread < cm->nrows*cm->ncols)
-					goto EOFerror;
-			} while (nread < cm->nrows*cm->ncols);
-
-		} else if (dtype == DTdouble) {
-			double	dc[3];			/* load from double */
-			COLORV	*cvp = cm->cmem;
-			int	n = nrows*ncols;
-
-			if (n <= 0)
-				goto not_handled;
-			while (n--) {
-				if (fread(dc, sizeof(double), 3, fp) != 3)
-					goto EOFerror;
-				copycolor(cvp, dc);
-				cvp += 3;
-			}
-		} else /* dtype == DTfloat */ {
-			float	fc[3];			/* load from float */
-			COLORV	*cvp = cm->cmem;
-			int	n = nrows*ncols;
-
-			if (n <= 0)
-				goto not_handled;
-			while (n--) {
-				if (fread(fc, sizeof(float), 3, fp) != 3)
-					goto EOFerror;
-				copycolor(cvp, fc);
-				cvp += 3;
-			}
-		}
-		if (getc(fp) != EOF) {
-				sprintf(errmsg,
-				"unexpected data at end of binary file %s",
-						fname);
-				error(WARNING, errmsg);
-		}
-	}
-	if (fp != stdin)
-		fclose(fp);
-	return(cm);
-EOFerror:
-	sprintf(errmsg, "unexpected EOF reading %s",
-			fname);
-	error(USER, errmsg);
-not_handled:
-	error(INTERNAL, "unhandled data size or length in cm_load()");
-	return(NULL);	/* gratis return */
-}
-
-/* Multiply two matrices (or a matrix and a vector) and allocate the result*/
-static CMATRIX *
-cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2)
-{
-	CMATRIX	*cmr;
-	int	dr, dc, i;
-
-	if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows))
-		error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
-	cmr = cm_alloc(cm1->nrows, cm2->ncols);
-	if (cmr == NULL)
-		return(NULL);
-	for (dr = 0; dr < cmr->nrows; dr++)
-	    for (dc = 0; dc < cmr->ncols; dc++) {
-		COLORV	*dp = cm_lval(cmr,dr,dc);
-		dp[0] = dp[1] = dp[2] = 0;
-		for (i = 0; i < cm1->ncols; i++) {
-		    const COLORV	*cp1 = cm_lval(cm1,dr,i);
-		    const COLORV	*cp2 = cm_lval(cm2,i,dc);
-		    dp[0] += cp1[0] * cp2[0];
-		    dp[1] += cp1[1] * cp2[1];
-		    dp[2] += cp1[2] * cp2[2];
-		}
-	    }
-	return(cmr);
-}
-
-/* print out matrix as ASCII text -- no header */
-static void
-cm_print(const CMATRIX *cm, FILE *fp)
-{
-	int		r, c;
-	const COLORV	*mp = cm->cmem;
-	
-	for (r = 0; r < cm->nrows; r++) {
-		for (c = 0; c < cm->ncols; c++, mp += 3)
-			fprintf(fp, "\t%.6e %.6e %.6e", mp[0], mp[1], mp[2]);
-		fputc('\n', fp);
-	}
-}
-
-/* convert a BSDF to our matrix representation */
-static CMATRIX *
-cm_bsdf(const struct BSDF_data *bsdf)
-{
-	CMATRIX	*cm = cm_alloc(bsdf->nout, bsdf->ninc);
-	int	nbadohm = 0;
-	int	nneg = 0;
-	int	r, c;
-	
-	for (c = 0; c < cm->ncols; c++) {
-		float	dom = getBSDF_incohm(bsdf,c);
-		FVECT	v;
-		
-		if (dom <= .0) {
-			nbadohm++;
-			continue;
-		}
-		if (!getBSDF_incvec(v,bsdf,c) || v[2] > FTINY)
-			error(USER, "illegal incoming BTDF direction");
-		dom *= -v[2];
-
-		for (r = 0; r < cm->nrows; r++) {
-			float	f = BSDF_value(bsdf,c,r);
-			COLORV	*mp = cm_lval(cm,r,c);
-
-			if (f <= .0) {
-				nneg += (f < -FTINY);
-				f = .0f;
-			}
-			mp[0] = mp[1] = mp[2] = f * dom;
-		}
-	}
-	if (nneg || nbadohm) {
-		sprintf(errmsg,
-		    "BTDF has %d negatives and %d bad incoming solid angles",
-				nneg, nbadohm);
-		error(WARNING, errmsg);
-	}
-	return(cm);
-}
-
-/* Sum together a set of images and write result to stdout */
-static int
 sum_images(const char *fspec, const CMATRIX *cv, FILE *fout)
 {
 	int	myDT = DTfromHeader;
-	CMATRIX	*pmat;
-	COLOR	*scanline;
-	int	myXR, myYR;
+	COLR	*scanline = NULL;
+	CMATRIX	*pmat = NULL;
+	int	myXR=0, myYR=0;
 	int	i, y;
 
 	if (cv->ncols != 1)
 		error(INTERNAL, "expected vector in sum_images()");
 	for (i = 0; i < cv->nrows; i++) {
 		const COLORV	*scv = cv_lval(cv,i);
+		int		flat_file = 0;
 		char		fname[1024];
 		FILE		*fp;
+		long		data_start;
 		int		dt, xr, yr;
 		COLORV		*psp;
+		char		*err;
 							/* check for zero */
-		if ((scv[RED] == .0) & (scv[GRN] == .0) & (scv[BLU] == .0))
+		if ((scv[RED] == 0) & (scv[GRN] == 0) & (scv[BLU] == 0) &&
+				(myDT != DTfromHeader) | (i < cv->nrows-1))
 			continue;
 							/* open next picture */
 		sprintf(fname, fspec, i);
-		if ((fp = fopen(fname, "r")) == NULL) {
+		if ((fp = fopen(fname, "rb")) == NULL) {
 			sprintf(errmsg, "cannot open picture '%s'", fname);
 			error(SYSTEM, errmsg);
 		}
-		SET_FILE_BINARY(fp);
-		dt = getDTfromHeader(fp);
+		dt = DTfromHeader;
+		if ((err = cm_getheader(&dt, NULL, NULL, NULL, NULL, fp)) != NULL)
+			error(USER, err);
 		if ((dt != DTrgbe) & (dt != DTxyze) ||
 				!fscnresolu(&xr, &yr, fp)) {
 			sprintf(errmsg, "file '%s' not a picture", fname);
@@ -369,111 +58,346 @@ sum_images(const char *fspec, const CMATRIX *cv, FILE 
 		if (myDT == DTfromHeader) {		/* on first one */
 			myDT = dt;
 			myXR = xr; myYR = yr;
-			scanline = (COLOR *)malloc(sizeof(COLOR)*myXR);
+			scanline = (COLR *)malloc(sizeof(COLR)*myXR);
 			if (scanline == NULL)
 				error(SYSTEM, "out of memory in sum_images()");
 			pmat = cm_alloc(myYR, myXR);
 			memset(pmat->cmem, 0, sizeof(COLOR)*myXR*myYR);
 							/* finish header */
-			fputformat(myDT==DTrgbe ? COLRFMT : CIEFMT, fout);
+			fputformat(cm_fmt_id[myDT], fout);
 			fputc('\n', fout);
-			fprtresolu(myXR, myYR, fout);
 			fflush(fout);
 		} else if ((dt != myDT) | (xr != myXR) | (yr != myYR)) {
 			sprintf(errmsg, "picture '%s' format/size mismatch",
 					fname);
 			error(USER, errmsg);
 		}
+							/* flat file check */
+		if ((data_start = ftell(fp)) > 0 && fseek(fp, 0L, SEEK_END) == 0) {
+			flat_file = (ftell(fp) == data_start + sizeof(COLR)*xr*yr);
+			if (fseek(fp, data_start, SEEK_SET) < 0) {
+				sprintf(errmsg, "cannot seek on picture '%s'", fname);
+				error(SYSTEM, errmsg);
+			}
+		}
 		psp = pmat->cmem;
 		for (y = 0; y < yr; y++) {		/* read it in */
+			COLOR	col;
 			int	x;
-			if (freadscan(scanline, xr, fp) < 0) {
+			if (flat_file ? getbinary(scanline, sizeof(COLR), xr, fp) != xr :
+					freadcolrs(scanline, xr, fp) < 0) {
 				sprintf(errmsg, "error reading picture '%s'",
 						fname);
 				error(SYSTEM, errmsg);
 			}
 							/* sum in scanline */
 			for (x = 0; x < xr; x++, psp += 3) {
-				multcolor(scanline[x], scv);
-				addcolor(psp, scanline[x]);
+				if (!scanline[x][EXP])
+					continue;	/* skip zeroes */
+				colr_color(col, scanline[x]);
+				multcolor(col, scv);
+				addcolor(psp, col);
 			}
 		}
 		fclose(fp);				/* done this picture */
 	}
 	free(scanline);
-							/* write scanlines */
-	for (y = 0; y < myYR; y++)
-		if (fwritescan((COLOR *)cm_lval(pmat, y, 0), myXR, fout) < 0)
-			return(0);
-	cm_free(pmat);					/* all done */
-	return(fflush(fout) == 0);
+	i = cm_write(pmat, myDT, fout);			/* write picture */
+	cm_free(pmat);					/* free data */
+	return(i);
 }
 
+/* adjust matrix dimensions according to user size(s) */
+static int
+alt_dim(CMATRIX *cm, int nr, int nc)
+{
+	if ((nr <= 0) & (nc <= 0))
+		return(0);
+	if ((nr == cm->nrows) & (nc == cm->ncols))
+		return(0);
+	if (nr > 0) {
+		if (nc <= 0)
+			nc = cm->nrows*cm->ncols/nr;
+		if (nr*nc != cm->nrows*cm->ncols) {
+			fprintf(stderr, "Bad dimensions: %dx%d != %dx%d\n",
+					nr, nc, cm->nrows, cm->ncols);
+			return(-1);
+		}
+	} else /* nc > 0 */ {
+		nr = cm->nrows*cm->ncols/nc;
+		if (nc*nr != cm->nrows*cm->ncols) {
+			fprintf(stderr, "Bad dimensions: %d does not divide %dx%d evenly\n",
+					nc, cm->nrows, cm->ncols);
+			return(-1);
+		}
+	}
+	cm->nrows = nr;
+	cm->ncols = nc;
+	return(1);
+}
+
 /* check to see if a string contains a %d or %o specification */
 static int
 hasNumberFormat(const char *s)
 {
-	while (*s && *s != '%')
-		s++;
-	if (!*s)
+	if (s == NULL)
 		return(0);
-	do
-		++s;
-	while (isdigit(*s));
 
-	return(*s == 'd' | *s == 'i' | *s == 'o' | *s == 'x' | *s == 'X');
+	while (*s) {
+		while (*s != '%')
+			if (!*s++)
+				return(0);
+		if (*++s == '%') {		/* ignore "%%" */
+			++s;
+			continue;
+		}
+		while (isdigit(*s))		/* field length */
+			++s;
+						/* field we'll use? */
+		if ((*s == 'd') | (*s == 'i') | (*s == 'o') |
+					(*s == 'x') | (*s == 'X'))
+			return(1);
+	}
+	return(0);				/* didn't find one */
 }
 
 int
 main(int argc, char *argv[])
 {
-	CMATRIX			*cvec;
+	int		skyfmt = DTfromHeader;
+	int		outfmt = DTascii;
+	int		headout = 1;
+	int		nsteps = 0;
+	char		*ofspec = NULL;
+	FILE		*ofp = stdout;
+	int		xres=0, yres=0;
+	CMATRIX		*cmtx;		/* component vector/matrix result */
+	char		fnbuf[256];
+	int		a, i;
 
 	progname = argv[0];
+					/* get options */
+	for (a = 1; a < argc && argv[a][0] == '-'; a++)
+		switch (argv[a][1]) {
+		case 'n':
+			nsteps = atoi(argv[++a]);
+			if (nsteps < 0)
+				goto userr;
+			skyfmt = nsteps ? DTascii : DTfromHeader;
+			break;
+		case 'h':
+			headout = !headout;
+			break;
+		case 'i':
+			switch (argv[a][2]) {
+			case 'f':
+				skyfmt = DTfloat;
+				break;
+			case 'd':
+				skyfmt = DTdouble;
+				break;
+			case 'a':
+				skyfmt = DTascii;
+				break;
+			default:
+				goto userr;
+			}
+			break;
+		case 'o':
+			switch (argv[a][2]) {
+			case '\0':	/* output specification (not format) */
+				ofspec = argv[++a];
+				break;
+			case 'f':
+				outfmt = DTfloat;
+				break;
+			case 'd':
+				outfmt = DTdouble;
+				break;
+			case 'a':
+				outfmt = DTascii;
+				break;
+			case 'c':
+				outfmt = DTrgbe;
+				break;
+			default:
+				goto userr;
+			}
+			break;
+		case 'x':
+			xres = atoi(argv[++a]);
+			break;
+		case 'y':
+			yres = atoi(argv[++a]);
+			break;
+		default:
+			goto userr;
+		}
+	if ((argc-a < 1) | (argc-a > 4))
+		goto userr;
 
-	if ((argc < 2) | (argc > 5)) {
-		fprintf(stderr, "Usage: %s DCspec [tregvec]\n", progname);
-		fprintf(stderr, "   or: %s Vspec Tbsdf.xml Dmat.dat [tregvec]\n",
-					progname);
-		return(1);
-	}
-
-	if (argc > 3) {				/* VTDs expression */
-		CMATRIX	*svec, *Dmat, *Tmat, *ivec;
-		struct BSDF_data	*btdf;
-						/* get sky vector */
-		svec = cm_load(argv[4], 0, 1, DTascii);
+	if (argc-a > 2) {			/* VTDs expression */
+		CMATRIX		*smtx, *Dmat, *Tmat, *imtx;
+		const char	*ccp;
+						/* get sky vector/matrix */
+		smtx = cm_load(argv[a+3], 0, nsteps, skyfmt);
+		nsteps = smtx->ncols;
 						/* load BSDF */
-		btdf = load_BSDF(argv[2]);
-		if (btdf == NULL)
-			return(1);
+		if (argv[a+1][0] != '!' &&
+				(ccp = strrchr(argv[a+1], '.')) != NULL &&
+				!strcasecmp(ccp+1, "XML"))
+			Tmat = cm_loadBTDF(argv[a+1]);
+		else
+			Tmat = cm_load(argv[a+1], 0, 0, DTfromHeader);
 						/* load Daylight matrix */
-		Dmat = cm_load(argv[3], btdf->ninc, svec->nrows, DTfromHeader);
+		Dmat = cm_load(argv[a+2], Tmat->ncols,
+					smtx->nrows, DTfromHeader);
 						/* multiply vector through */
-		ivec = cm_multiply(Dmat, svec);
-		cm_free(Dmat); cm_free(svec);
-		Tmat = cm_bsdf(btdf);		/* convert BTDF to matrix */
-		free_BSDF(btdf);
-		cvec = cm_multiply(Tmat, ivec);	/* cvec = component vector */
-		cm_free(Tmat); cm_free(ivec);
-	} else {				/* else just use sky vector */
-		cvec = cm_load(argv[2], 0, 1, DTascii);
+		imtx = cm_multiply(Dmat, smtx);
+		cm_free(Dmat); cm_free(smtx);
+		cmtx = cm_multiply(Tmat, imtx);
+		cm_free(Tmat); 
+		cm_free(imtx);
+	} else {				/* sky vector/matrix only */
+		cmtx = cm_load(argv[a+1], 0, nsteps, skyfmt);
+		nsteps = cmtx->ncols;
 	}
-
-	if (hasNumberFormat(argv[1])) {		/* generating image */
-		SET_FILE_BINARY(stdout);
-		newheader("RADIANCE", stdout);
-		printargs(argc, argv, stdout);
-		fputnow(stdout);
-		if (!sum_images(argv[1], cvec, stdout))
+						/* prepare output stream */
+	if ((ofspec != NULL) & (nsteps == 1) && hasNumberFormat(ofspec)) {
+		sprintf(fnbuf, ofspec, 1);
+		ofspec = fnbuf;
+	}
+	if (ofspec != NULL && !hasNumberFormat(ofspec)) {
+		if ((ofp = fopen(ofspec, "w")) == NULL) {
+			fprintf(stderr, "%s: cannot open '%s' for output\n",
+					progname, ofspec);
 			return(1);
-	} else {				/* generating vector */
-		CMATRIX	*Vmat = cm_load(argv[1], 0, cvec->nrows, DTfromHeader);
-		CMATRIX	*rvec = cm_multiply(Vmat, cvec);
+		}
+		ofspec = NULL;			/* only need to open once */
+	}
+	if (hasNumberFormat(argv[a])) {		/* generating image(s) */
+		if (outfmt != DTrgbe) {
+			error(WARNING, "changing output type to -oc");
+			outfmt = DTrgbe;
+		}
+		if (ofspec == NULL) {
+			SET_FILE_BINARY(ofp);
+			newheader("RADIANCE", ofp);
+			printargs(argc, argv, ofp);
+			fputnow(ofp);
+		}
+		if (nsteps > 1)			/* multiple output frames? */
+			for (i = 0; i < nsteps; i++) {
+				CMATRIX	*cvec = cm_column(cmtx, i);
+				if (ofspec != NULL) {
+					sprintf(fnbuf, ofspec, i);
+					if ((ofp = fopen(fnbuf, "wb")) == NULL) {
+						fprintf(stderr,
+					"%s: cannot open '%s' for output\n",
+							progname, fnbuf);
+						return(1);
+					}
+					newheader("RADIANCE", ofp);
+					printargs(argc, argv, ofp);
+					fputnow(ofp);
+				}
+				fprintf(ofp, "FRAME=%d\n", i);
+				if (!sum_images(argv[a], cvec, ofp))
+					return(1);
+				if (ofspec != NULL) {
+					if (fclose(ofp) == EOF) {
+						fprintf(stderr,
+						"%s: error writing to '%s'\n",
+							progname, fnbuf);
+						return(1);
+					}
+					ofp = stdout;
+				}
+				cm_free(cvec);
+			}
+		else if (!sum_images(argv[a], cmtx, ofp))
+			return(1);
+	} else {				/* generating vector/matrix */
+		CMATRIX	*Vmat = cm_load(argv[a], 0, cmtx->nrows, DTfromHeader);
+		CMATRIX	*rmtx = cm_multiply(Vmat, cmtx);
 		cm_free(Vmat);
-		cm_print(rvec, stdout);
-		cm_free(rvec);
+		if (ofspec != NULL) {		/* multiple vector files? */
+			const char	*wtype = (outfmt==DTascii) ? "w" : "wb";
+			for (i = 0; i < nsteps; i++) {
+				CMATRIX	*rvec = cm_column(rmtx, i);
+				if (alt_dim(rvec, yres, xres) < 0)
+					return(1);
+				sprintf(fnbuf, ofspec, i);
+				if ((ofp = fopen(fnbuf, wtype)) == NULL) {
+					fprintf(stderr,
+					"%s: cannot open '%s' for output\n",
+							progname, fnbuf);
+					return(1);
+				}
+#ifdef getc_unlocked
+				flockfile(ofp);
+#endif
+				if (headout) {	/* header output */
+					newheader("RADIANCE", ofp);
+					printargs(argc, argv, ofp);
+					fputnow(ofp);
+					fprintf(ofp, "FRAME=%d\n", i);
+					if ((outfmt != DTrgbe) & (outfmt != DTxyze)) {
+						fprintf(ofp, "NROWS=%d\n", rvec->nrows);
+						fprintf(ofp, "NCOLS=%d\n", rvec->ncols);
+						fputs("NCOMP=3\n", ofp);
+					}
+					if ((outfmt == DTfloat) | (outfmt == DTdouble))
+						fputendian(ofp);
+					fputformat(cm_fmt_id[outfmt], ofp);
+					fputc('\n', ofp);
+				}
+				cm_write(rvec, outfmt, ofp);
+				if (fclose(ofp) == EOF) {
+					fprintf(stderr,
+						"%s: error writing to '%s'\n",
+							progname, fnbuf);
+					return(1);
+				}
+				ofp = stdout;
+				cm_free(rvec);
+			}
+		} else {
+#ifdef getc_unlocked
+			flockfile(ofp);
+#endif
+			if (outfmt != DTascii)
+				SET_FILE_BINARY(ofp);
+			if (alt_dim(rmtx, yres, xres) < 0)
+				return(1);
+			if (headout) {		/* header output */
+				newheader("RADIANCE", ofp);
+				printargs(argc, argv, ofp);
+				fputnow(ofp);
+				if ((outfmt != DTrgbe) & (outfmt != DTxyze)) {
+					fprintf(ofp, "NROWS=%d\n", rmtx->nrows);
+					fprintf(ofp, "NCOLS=%d\n", rmtx->ncols);
+					fputs("NCOMP=3\n", ofp);
+				}
+				if ((outfmt == DTfloat) | (outfmt == DTdouble))
+					fputendian(ofp);
+				fputformat(cm_fmt_id[outfmt], ofp);
+				fputc('\n', ofp);
+			}
+			cm_write(rmtx, outfmt, ofp);
+		}
+		cm_free(rmtx);
 	}
-	cm_free(cvec);				/* final clean-up */
+	if (fflush(ofp) == EOF) {		/* final clean-up */
+		fprintf(stderr, "%s: write error on output\n", progname);
+		return(1);
+	}
+	cm_free(cmtx);
 	return(0);
+userr:
+	fprintf(stderr, "Usage: %s [-n nsteps][-o ospec][-x xr][-y yr][-i{f|d|h}][-o{f|d|c}] DCspec [skyf]\n",
+				progname);
+	fprintf(stderr, "   or: %s [-n nsteps][-o ospec][-x xr][-y yr][-i{f|d|h}][-o{f|d|c}] Vspec Tbsdf Dmat.dat [skyf]\n",
+				progname);
+	return(1);
 }