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#ifndef lint |
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static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.29 2016/02/02 00:42:11 greg Exp $"; |
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#endif |
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/* |
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* Load measured BSDF data in PAB-Opto format. |
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* Assumes that surface-normal (Z-axis) faces into room unless -t option given. |
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* |
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* G. Ward |
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*/ |
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|
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#define _USE_MATH_DEFINES |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <ctype.h> |
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#include <math.h> |
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#include "platform.h" |
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#include "bsdfrep.h" |
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#include "resolu.h" |
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/* global argv[0] */ |
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char *progname; |
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|
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typedef struct { |
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const char *fname; /* input file path */ |
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double theta, phi; /* input angles (degrees) */ |
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double up_phi; /* azimuth for "up" direction */ |
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int igp[2]; /* input grid position */ |
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int isDSF; /* data is DSF (rather than BSDF)? */ |
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int nspec; /* number of spectral samples */ |
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long dstart; /* data start offset in file */ |
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} PGINPUT; |
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|
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PGINPUT *inpfile; /* input files sorted by incidence */ |
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int ninpfiles; /* number of input files */ |
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|
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int rev_orient = 0; /* shall we reverse surface orientation? */ |
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|
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/* Compare incident angles */ |
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static int |
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cmp_indir(const void *p1, const void *p2) |
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{ |
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const PGINPUT *inp1 = (const PGINPUT *)p1; |
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const PGINPUT *inp2 = (const PGINPUT *)p2; |
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int ydif = inp1->igp[1] - inp2->igp[1]; |
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|
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if (ydif) |
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return(ydif); |
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|
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return(inp1->igp[0] - inp2->igp[0]); |
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} |
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|
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/* Prepare a PAB-Opto input file by reading its header */ |
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static int |
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init_pabopto_inp(const int i, const char *fname) |
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{ |
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FILE *fp = fopen(fname, "r"); |
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FVECT dv; |
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char buf[2048]; |
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int c; |
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|
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if (fp == NULL) { |
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fputs(fname, stderr); |
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fputs(": cannot open\n", stderr); |
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return(0); |
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} |
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inpfile[i].fname = fname; |
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inpfile[i].isDSF = -1; |
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inpfile[i].nspec = 0; |
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inpfile[i].up_phi = 0; |
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inpfile[i].theta = inpfile[i].phi = -10001.; |
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/* read header information */ |
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while ((c = getc(fp)) == '#' || c == EOF) { |
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char typ[64]; |
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if (fgets(buf, sizeof(buf), fp) == NULL) { |
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fputs(fname, stderr); |
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fputs(": unexpected EOF\n", stderr); |
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fclose(fp); |
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return(0); |
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} |
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if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1) |
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continue; |
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if (sscanf(buf, "colorimetry: %s", typ) == 1) { |
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if (!strcasecmp(typ, "CIE-XYZ")) |
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inpfile[i].nspec = 3; |
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else if (!strcasecmp(typ, "CIE-Y")) |
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inpfile[i].nspec = 1; |
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continue; |
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} |
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if (sscanf(buf, "format: theta phi %s", typ) == 1) { |
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if (!strcasecmp(typ, "DSF")) |
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inpfile[i].isDSF = 1; |
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else if (!strcasecmp(typ, "BSDF") || |
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!strcasecmp(typ, "BRDF") || |
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!strcasecmp(typ, "BTDF")) |
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inpfile[i].isDSF = 0; |
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continue; |
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} |
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if (sscanf(buf, "upphi %lf", &inpfile[i].up_phi) == 1) |
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continue; |
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if (sscanf(buf, "intheta %lf", &inpfile[i].theta) == 1) |
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continue; |
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if (sscanf(buf, "inphi %lf", &inpfile[i].phi) == 1) |
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continue; |
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if (sscanf(buf, "incident_angle %lf %lf", |
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&inpfile[i].theta, &inpfile[i].phi) == 2) |
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continue; |
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} |
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inpfile[i].dstart = ftell(fp) - 1; |
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fclose(fp); |
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if (inpfile[i].isDSF < 0) { |
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fputs(fname, stderr); |
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fputs(": unknown format\n", stderr); |
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return(0); |
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} |
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if ((inpfile[i].theta < -10000.) | (inpfile[i].phi < -10000.)) { |
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fputs(fname, stderr); |
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fputs(": unknown incident angle\n", stderr); |
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return(0); |
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} |
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if (rev_orient) { /* reverse Z-axis to face outside */ |
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inpfile[i].theta = 180. - inpfile[i].theta; |
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inpfile[i].phi = 360. - inpfile[i].phi; |
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} |
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/* convert to Y-up orientation */ |
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inpfile[i].phi += 90.-inpfile[i].up_phi; |
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/* convert angle to grid position */ |
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dv[2] = sin(M_PI/180.*inpfile[i].theta); |
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dv[0] = cos(M_PI/180.*inpfile[i].phi)*dv[2]; |
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dv[1] = sin(M_PI/180.*inpfile[i].phi)*dv[2]; |
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dv[2] = sqrt(1. - dv[2]*dv[2]); |
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if (inpfile[i].theta <= FTINY) |
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inpfile[i].igp[0] = inpfile[i].igp[1] = grid_res/2 - 1; |
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else |
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pos_from_vec(inpfile[i].igp, dv); |
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return(1); |
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} |
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|
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/* Load a set of measurements corresponding to a particular incident angle */ |
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static int |
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add_pabopto_inp(const int i) |
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{ |
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FILE *fp = fopen(inpfile[i].fname, "r"); |
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double theta_out, phi_out, val[3]; |
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int n, c; |
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|
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if (fp == NULL || fseek(fp, inpfile[i].dstart, 0) == EOF) { |
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fputs(inpfile[i].fname, stderr); |
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fputs(": cannot open\n", stderr); |
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return(0); |
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} |
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/* prepare input grid */ |
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if (!i || cmp_indir(&inpfile[i-1], &inpfile[i])) { |
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if (i) /* process previous incidence */ |
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make_rbfrep(); |
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#ifdef DEBUG |
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fprintf(stderr, "New incident (theta,phi)=(%.1f,%.1f)\n", |
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inpfile[i].theta, inpfile[i].phi); |
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#endif |
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if (inpfile[i].nspec) |
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set_spectral_samples(inpfile[i].nspec); |
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new_bsdf_data(inpfile[i].theta, inpfile[i].phi); |
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} |
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#ifdef DEBUG |
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fprintf(stderr, "Loading measurements from '%s'...\n", inpfile[i].fname); |
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#endif |
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/* read scattering data */ |
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while (fscanf(fp, "%lf %lf %lf", &theta_out, &phi_out, val) == 3) { |
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for (n = 1; n < inpfile[i].nspec; n++) |
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if (fscanf(fp, "%lf", val+n) != 1) { |
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fprintf(stderr, "%s: warning: unexpected EOF\n", |
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inpfile[i].fname); |
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fclose(fp); |
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return(1); |
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} |
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if (rev_orient) { /* reverse Z-axis to face outside */ |
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theta_out = 180. - theta_out; |
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phi_out = 360. - phi_out; |
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} |
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add_bsdf_data(theta_out, phi_out+90.-inpfile[i].up_phi, |
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val, inpfile[i].isDSF); |
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} |
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n = 0; |
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while ((c = getc(fp)) != EOF) |
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n += !isspace(c); |
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if (n) |
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fprintf(stderr, |
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"%s: warning: %d unexpected characters past EOD\n", |
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inpfile[i].fname, n); |
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fclose(fp); |
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return(1); |
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} |
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|
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#ifndef TEST_MAIN |
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/* Read in PAB-Opto BSDF files and output RBF interpolant */ |
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int |
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main(int argc, char *argv[]) |
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{ |
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extern int nprocs; |
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int i; |
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/* start header */ |
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SET_FILE_BINARY(stdout); |
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newheader("RADIANCE", stdout); |
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printargs(argc, argv, stdout); |
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fputnow(stdout); |
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progname = argv[0]; /* get options */ |
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while (argc > 2 && argv[1][0] == '-') { |
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switch (argv[1][1]) { |
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case 't': |
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rev_orient = !rev_orient; |
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break; |
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case 'n': |
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nprocs = atoi(argv[2]); |
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argv++; argc--; |
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break; |
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default: |
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goto userr; |
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} |
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argv++; argc--; |
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} |
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/* initialize & sort inputs */ |
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ninpfiles = argc - 1; |
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if (ninpfiles < 2) |
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goto userr; |
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inpfile = (PGINPUT *)malloc(sizeof(PGINPUT)*ninpfiles); |
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if (inpfile == NULL) |
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return(1); |
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for (i = 0; i < ninpfiles; i++) |
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if (!init_pabopto_inp(i, argv[i+1])) |
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return(1); |
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qsort(inpfile, ninpfiles, sizeof(PGINPUT), cmp_indir); |
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/* compile measurements */ |
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for (i = 0; i < ninpfiles; i++) |
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if (!add_pabopto_inp(i)) |
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return(1); |
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make_rbfrep(); /* process last data set */ |
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build_mesh(); /* create interpolation */ |
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save_bsdf_rep(stdout); /* write it out */ |
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return(0); |
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userr: |
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fprintf(stderr, "Usage: %s [-t][-n nproc] meas1.dat meas2.dat .. > bsdf.sir\n", |
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progname); |
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return(1); |
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} |
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#else |
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/* Test main produces a Radiance model from the given input file */ |
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int |
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main(int argc, char *argv[]) |
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{ |
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PGINPUT pginp; |
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char buf[128]; |
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FILE *pfp; |
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double bsdf, min_log; |
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FVECT dir; |
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int i, j, n; |
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|
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progname = argv[0]; |
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if (argc != 2) { |
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fprintf(stderr, "Usage: %s input.dat > output.rad\n", progname); |
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return(1); |
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} |
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ninpfiles = 1; |
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inpfile = &pginp; |
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if (!init_pabopto_inp(0, argv[1]) || !add_pabopto_inp(0)) |
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return(1); |
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/* reduce data set */ |
| 266 |
if (make_rbfrep() == NULL) { |
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fprintf(stderr, "%s: nothing to plot!\n", progname); |
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exit(1); |
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} |
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#ifdef DEBUG |
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fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min); |
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#endif |
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min_log = log(bsdf_min*.5 + 1e-5); |
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#if 1 /* produce spheres at meas. */ |
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puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n"); |
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n = 0; |
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for (i = 0; i < grid_res; i++) |
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for (j = 0; j < grid_res; j++) |
| 279 |
if (dsf_grid[i][j].sum.n > 0) { |
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ovec_from_pos(dir, i, j); |
| 281 |
bsdf = dsf_grid[i][j].sum.v / |
| 282 |
((double)dsf_grid[i][j].sum.n*output_orient*dir[2]); |
| 283 |
if (bsdf <= bsdf_min*.6) |
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continue; |
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bsdf = log(bsdf + 1e-5) - min_log; |
| 286 |
ovec_from_pos(dir, i, j); |
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printf("yellow sphere s%04d\n0\n0\n", ++n); |
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printf("4 %.6g %.6g %.6g %.6g\n\n", |
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dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, |
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.007*bsdf); |
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} |
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#endif |
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#if 1 /* spheres at RBF peaks */ |
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puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n"); |
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for (n = 0; n < dsf_list->nrbf; n++) { |
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RBFVAL *rbf = &dsf_list->rbfa[n]; |
| 297 |
ovec_from_pos(dir, rbf->gx, rbf->gy); |
| 298 |
bsdf = eval_rbfrep(dsf_list, dir); |
| 299 |
bsdf = log(bsdf + 1e-5) - min_log; |
| 300 |
printf("red sphere p%04d\n0\n0\n", ++n); |
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printf("4 %.6g %.6g %.6g %.6g\n\n", |
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dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, |
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.011*bsdf); |
| 304 |
} |
| 305 |
#endif |
| 306 |
#if 1 /* output continuous surface */ |
| 307 |
puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n"); |
| 308 |
fflush(stdout); |
| 309 |
sprintf(buf, "gensurf tgreen bsdf - - - %d %d", grid_res-1, grid_res-1); |
| 310 |
pfp = popen(buf, "w"); |
| 311 |
if (pfp == NULL) { |
| 312 |
fprintf(stderr, "%s: cannot open '| %s'\n", progname, buf); |
| 313 |
return(1); |
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} |
| 315 |
for (i = 0; i < grid_res; i++) |
| 316 |
for (j = 0; j < grid_res; j++) { |
| 317 |
ovec_from_pos(dir, i, j); |
| 318 |
bsdf = eval_rbfrep(dsf_list, dir); |
| 319 |
bsdf = log(bsdf + 1e-5) - min_log; |
| 320 |
fprintf(pfp, "%.8e %.8e %.8e\n", |
| 321 |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); |
| 322 |
} |
| 323 |
if (pclose(pfp) != 0) |
| 324 |
return(1); |
| 325 |
#endif |
| 326 |
return(0); |
| 327 |
} |
| 328 |
#endif |
