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#ifndef lint |
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static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.41 2021/04/05 21:06:32 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 <stdlib.h> |
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#include <ctype.h> |
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#include <math.h> |
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#include "rtio.h" |
16 |
#include "platform.h" |
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#include "paths.h" |
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#include "bsdfrep.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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|
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int rev_orient = 0; /* shall we reverse surface orientation? */ |
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|
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double lim_graze = 0; /* limit scattering near grazing (deg above) */ |
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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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/* Assign grid position from theta and phi */ |
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static void |
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set_grid_pos(PGINPUT *pip) |
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{ |
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FVECT dv; |
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|
58 |
if (pip->theta <= FTINY) { |
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pip->igp[0] = pip->igp[1] = grid_res/2 - 1; |
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return; |
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} |
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dv[2] = sin(M_PI/180.*pip->theta); |
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dv[0] = cos(M_PI/180.*pip->phi)*dv[2]; |
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dv[1] = sin(M_PI/180.*pip->phi)*dv[2]; |
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dv[2] = sqrt(1. - dv[2]*dv[2]); |
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pos_from_vec(pip->igp, dv); |
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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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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; |
98 |
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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} |
105 |
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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} |
140 |
/* convert to Y-up orientation */ |
141 |
inpfile[i].phi += 90.-inpfile[i].up_phi; |
142 |
/* convert angle to grid position */ |
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set_grid_pos(&inpfile[i]); |
144 |
return(1); |
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} |
146 |
|
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/* Load a set of measurements corresponding to a particular incident angle */ |
148 |
static int |
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add_pabopto_inp(const int i) |
150 |
{ |
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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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/* check if scatter angle is too low */ |
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if (fabs(theta_out - 90.) < lim_graze-FTINY) |
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continue; |
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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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phi_out += 90.-inpfile[i].up_phi; |
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add_bsdf_data(theta_out, phi_out, 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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|
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#define SYM_ILL '?' /* illegal symmetry value */ |
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#define SYM_ISO 'I' /* isotropic */ |
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#define SYM_QUAD 'Q' /* quadrilateral symmetry */ |
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#define SYM_BILAT 'B' /* bilateral symmetry */ |
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#define SYM_ANISO 'A' /* anisotropic */ |
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#define SYM_UP 'U' /* "up-down" (180°) symmetry */ |
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|
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static const char quadrant_rep[16][16] = { |
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"in-plane","0-90","90-180","0-180", |
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"180-270","0-90+180-270","90-270", |
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"0-270","270-360","270-90", |
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"90-180+270-360","270-180","180-360", |
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"180-90","90-360","0-360" |
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}; |
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static const char quadrant_sym[16] = { |
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SYM_ISO, SYM_QUAD, SYM_QUAD, SYM_BILAT, |
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SYM_QUAD, SYM_ILL, SYM_BILAT, SYM_ILL, |
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SYM_QUAD, SYM_BILAT, SYM_ILL, SYM_ILL, |
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SYM_BILAT, SYM_ILL, SYM_ILL, SYM_ANISO |
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}; |
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|
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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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static char gval_buf[16]; |
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char * auto_grazing = NULL; |
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const char *symmetry = "0"; |
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int ninpfiles, totinc; |
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int a, i; |
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|
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progname = argv[0]; /* get options */ |
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for (a = 1; a < argc && argv[a][0] == '-'; a++) |
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switch (argv[a][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[++a]); |
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break; |
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case 's': |
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symmetry = argv[++a]; |
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break; |
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case 'g': |
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if (toupper(argv[a+1][0]) == 'A') |
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auto_grazing = argv[a+1] = gval_buf; |
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else |
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lim_graze = atof(argv[a+1]); |
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++a; |
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break; |
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default: |
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goto userr; |
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} |
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totinc = ninpfiles = argc - a; /* initialize & sort inputs */ |
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if (ninpfiles < 2) |
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goto userr; |
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if (toupper(symmetry[0]) == SYM_UP) /* special case for "up" symmetry */ |
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totinc += ninpfiles; |
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inpfile = (PGINPUT *)malloc(sizeof(PGINPUT)*totinc); |
267 |
if (inpfile == NULL) |
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return(1); |
269 |
if (auto_grazing) |
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lim_graze = 90.; |
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for (i = 0; i < ninpfiles; i++) { |
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if (!init_pabopto_inp(i, argv[a+i])) |
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return(1); |
274 |
if (auto_grazing && fabs(inpfile[i].theta - 90.) < lim_graze) |
275 |
lim_graze = fabs(inpfile[i].theta - 90.); |
276 |
} |
277 |
if (auto_grazing) |
278 |
sprintf(auto_grazing, "%.2f", lim_graze); |
279 |
for (i = ninpfiles; i < totinc; i++) { /* copy for "up" symmetry */ |
280 |
inpfile[i] = inpfile[i-ninpfiles]; |
281 |
inpfile[i].phi += 180.; /* invert duplicate data */ |
282 |
inpfile[i].up_phi -= 180.; |
283 |
set_grid_pos(&inpfile[i]); /* grid location for sorting */ |
284 |
} |
285 |
qsort(inpfile, totinc, sizeof(PGINPUT), cmp_indir); |
286 |
/* compile measurements */ |
287 |
for (i = 0; i < totinc; i++) |
288 |
if (!add_pabopto_inp(i)) |
289 |
return(1); |
290 |
make_rbfrep(); /* process last data set */ |
291 |
/* check input symmetry */ |
292 |
switch (toupper(symmetry[0])) { |
293 |
case '0': /* unspecified symmetry */ |
294 |
if (quadrant_sym[inp_coverage] != SYM_ILL) |
295 |
break; /* anything legal goes */ |
296 |
fprintf(stderr, "%s: unsupported phi coverage (%s)\n", |
297 |
progname, quadrant_rep[inp_coverage]); |
298 |
return(1); |
299 |
case SYM_UP: /* faux "up" symmetry */ |
300 |
if (quadrant_sym[inp_coverage] == SYM_ANISO) |
301 |
break; |
302 |
/* fall through */ |
303 |
case SYM_ISO: /* usual symmetry types */ |
304 |
case SYM_QUAD: |
305 |
case SYM_BILAT: |
306 |
case SYM_ANISO: |
307 |
if (quadrant_sym[inp_coverage] == toupper(symmetry[0])) |
308 |
break; /* matches spec */ |
309 |
fprintf(stderr, |
310 |
"%s: phi coverage (%s) does not match requested '%s' symmetry\n", |
311 |
progname, quadrant_rep[inp_coverage], symmetry); |
312 |
return(1); |
313 |
default: |
314 |
fprintf(stderr, |
315 |
"%s: -s option must be Isotropic, Quadrilateral, Bilateral, Up, or Anisotropic\n", |
316 |
progname); |
317 |
return(1); |
318 |
} |
319 |
#ifdef DEBUG |
320 |
fprintf(stderr, "Input phi coverage (%s) has '%c' symmetry\n", |
321 |
quadrant_rep[inp_coverage], |
322 |
quadrant_sym[inp_coverage]); |
323 |
#endif |
324 |
build_mesh(); /* create interpolation */ |
325 |
SET_FILE_BINARY(stdout); /* start header */ |
326 |
newheader("RADIANCE", stdout); |
327 |
printargs(argc, argv, stdout); |
328 |
fputnow(stdout); |
329 |
save_bsdf_rep(stdout); /* complete header + data */ |
330 |
return(0); |
331 |
userr: |
332 |
fprintf(stderr, "Usage: %s [-t][-n nproc][-s symmetry][-g angle|'A'] meas1.dat meas2.dat .. > bsdf.sir\n", |
333 |
progname); |
334 |
return(1); |
335 |
} |
336 |
|
337 |
#else /* TEST_MAIN */ |
338 |
|
339 |
/* Test main produces a Radiance model from the given input file */ |
340 |
int |
341 |
main(int argc, char *argv[]) |
342 |
{ |
343 |
PGINPUT pginp; |
344 |
char buf[128]; |
345 |
FILE *pfp; |
346 |
double bsdf, min_log; |
347 |
FVECT dir; |
348 |
int i, j, n; |
349 |
|
350 |
progname = argv[0]; |
351 |
if (argc != 2) { |
352 |
fprintf(stderr, "Usage: %s input.dat > output.rad\n", progname); |
353 |
return(1); |
354 |
} |
355 |
inpfile = &pginp; |
356 |
if (!init_pabopto_inp(0, argv[1]) || !add_pabopto_inp(0)) |
357 |
return(1); |
358 |
/* reduce data set */ |
359 |
if (make_rbfrep() == NULL) { |
360 |
fprintf(stderr, "%s: nothing to plot!\n", progname); |
361 |
exit(1); |
362 |
} |
363 |
#ifdef DEBUG |
364 |
fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min); |
365 |
#endif |
366 |
min_log = log(bsdf_min*.5 + 1e-5); |
367 |
#if 1 /* produce spheres at meas. */ |
368 |
puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n"); |
369 |
n = 0; |
370 |
for (i = 0; i < grid_res; i++) |
371 |
for (j = 0; j < grid_res; j++) |
372 |
if (dsf_grid[i][j].sum.n > 0) { |
373 |
ovec_from_pos(dir, i, j); |
374 |
bsdf = dsf_grid[i][j].sum.v / |
375 |
((double)dsf_grid[i][j].sum.n*output_orient*dir[2]); |
376 |
if (bsdf <= bsdf_min*.6) |
377 |
continue; |
378 |
bsdf = log(bsdf + 1e-5) - min_log; |
379 |
ovec_from_pos(dir, i, j); |
380 |
printf("yellow sphere s%04d\n0\n0\n", ++n); |
381 |
printf("4 %.6g %.6g %.6g %.6g\n\n", |
382 |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, |
383 |
.007*bsdf); |
384 |
} |
385 |
#endif |
386 |
#if 1 /* spheres at RBF peaks */ |
387 |
puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n"); |
388 |
for (n = 0; n < dsf_list->nrbf; n++) { |
389 |
RBFVAL *rbf = &dsf_list->rbfa[n]; |
390 |
ovec_from_pos(dir, rbf->gx, rbf->gy); |
391 |
bsdf = eval_rbfrep(dsf_list, dir); |
392 |
bsdf = log(bsdf + 1e-5) - min_log; |
393 |
printf("red sphere p%04d\n0\n0\n", ++n); |
394 |
printf("4 %.6g %.6g %.6g %.6g\n\n", |
395 |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, |
396 |
.011*bsdf); |
397 |
} |
398 |
#endif |
399 |
#if 1 /* output continuous surface */ |
400 |
puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n"); |
401 |
fflush(stdout); |
402 |
sprintf(buf, "gensurf tgreen bsdf - - - %d %d", grid_res-1, grid_res-1); |
403 |
pfp = popen(buf, "w"); |
404 |
if (pfp == NULL) { |
405 |
fprintf(stderr, "%s: cannot open '| %s'\n", progname, buf); |
406 |
return(1); |
407 |
} |
408 |
for (i = 0; i < grid_res; i++) |
409 |
for (j = 0; j < grid_res; j++) { |
410 |
ovec_from_pos(dir, i, j); |
411 |
bsdf = eval_rbfrep(dsf_list, dir); |
412 |
bsdf = log(bsdf + 1e-5) - min_log; |
413 |
fprintf(pfp, "%.8e %.8e %.8e\n", |
414 |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); |
415 |
} |
416 |
if (pclose(pfp) != 0) |
417 |
return(1); |
418 |
#endif |
419 |
return(0); |
420 |
} |
421 |
|
422 |
#endif /* TEST_MAIN */ |