| 1 |
#ifndef lint
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| 2 |
static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.43 2025/06/03 21:31:51 greg Exp $";
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| 3 |
#endif
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| 4 |
/*
|
| 5 |
* Load measured BSDF data in PAB-Opto format.
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| 6 |
* Assumes that surface-normal (Z-axis) faces into room unless -t option given.
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| 7 |
*
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| 8 |
* G. Ward
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| 9 |
*/
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| 10 |
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| 11 |
#define _USE_MATH_DEFINES
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| 12 |
#include <stdlib.h>
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| 13 |
#include <ctype.h>
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| 14 |
#include <math.h>
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| 15 |
#include "rtio.h"
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| 16 |
#include "bsdfrep.h"
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| 17 |
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| 18 |
typedef struct {
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| 19 |
const char *fname; /* input file path */
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| 20 |
double theta, phi; /* input angles (degrees) */
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| 21 |
double up_phi; /* azimuth for "up" direction */
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| 22 |
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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| 25 |
long dstart; /* data start offset in file */
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| 26 |
} PGINPUT;
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| 27 |
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| 28 |
PGINPUT *inpfile; /* input files sorted by incidence */
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| 29 |
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| 30 |
int rev_orient = 0; /* shall we reverse surface orientation? */
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| 31 |
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| 32 |
double lim_graze = 0; /* limit scattering near grazing (deg above) */
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| 33 |
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| 34 |
/* Compare incident angles */
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| 35 |
static int
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cmp_indir(const void *p1, const void *p2)
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| 37 |
{
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| 38 |
const PGINPUT *inp1 = (const PGINPUT *)p1;
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| 39 |
const PGINPUT *inp2 = (const PGINPUT *)p2;
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| 40 |
int ydif = inp1->igp[1] - inp2->igp[1];
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| 42 |
if (ydif)
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return(ydif);
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return(inp1->igp[0] - inp2->igp[0]);
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}
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| 48 |
/* 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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| 51 |
{
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| 52 |
FVECT dv;
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| 53 |
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| 54 |
if (pip->theta <= FTINY) {
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| 55 |
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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/* 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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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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| 79 |
inpfile[i].isDSF = -1;
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| 80 |
inpfile[i].nspec = 0;
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| 81 |
inpfile[i].up_phi = 0;
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| 82 |
inpfile[i].theta = inpfile[i].phi = -10001.;
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/* read header information */
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| 84 |
while ((c = getc(fp)) == '#' || c == EOF) {
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char typ[64];
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| 86 |
if (fgets(buf, sizeof(buf), fp) == NULL) {
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| 87 |
fputs(fname, stderr);
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| 88 |
fputs(": unexpected EOF\n", stderr);
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| 89 |
fclose(fp);
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return(0);
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}
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| 92 |
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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| 95 |
if (!strcasecmp(typ, "CIE-XYZ"))
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| 96 |
inpfile[i].nspec = 3;
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| 97 |
else if (!strcasecmp(typ, "CIE-Y"))
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| 98 |
inpfile[i].nspec = 1;
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continue;
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}
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| 101 |
if (sscanf(buf, "format: theta phi %s", typ) == 1) {
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| 102 |
if (!strcasecmp(typ, "DSF"))
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| 103 |
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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| 107 |
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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| 114 |
if (sscanf(buf, "inphi %lf", &inpfile[i].phi) == 1)
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continue;
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| 116 |
if (sscanf(buf, "incident_angle %lf %lf",
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| 117 |
&inpfile[i].theta, &inpfile[i].phi) == 2)
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continue;
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}
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| 120 |
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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| 128 |
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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set_grid_pos(&inpfile[i]);
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return(1);
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}
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| 143 |
/* Load a set of measurements corresponding to a particular incident angle */
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| 144 |
static int
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| 145 |
add_pabopto_inp(const int i)
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| 146 |
{
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| 147 |
FILE *fp = fopen(inpfile[i].fname, "r");
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| 148 |
double theta_out, phi_out, val[3];
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| 149 |
int n, c;
|
| 150 |
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| 151 |
if (fp == NULL || fseek(fp, inpfile[i].dstart, 0) == EOF) {
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| 152 |
fputs(inpfile[i].fname, stderr);
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fputs(": cannot open\n", stderr);
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| 154 |
return(0);
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}
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| 156 |
/* prepare input grid */
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| 157 |
if (!i || cmp_indir(&inpfile[i-1], &inpfile[i])) {
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| 158 |
if (i) /* process previous incidence */
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| 159 |
make_rbfrep();
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| 160 |
#ifdef DEBUG
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| 161 |
fprintf(stderr, "New incident (theta,phi)=(%.1f,%.1f)\n",
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| 162 |
inpfile[i].theta, inpfile[i].phi);
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#endif
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| 164 |
if (inpfile[i].nspec)
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| 165 |
set_spectral_samples(inpfile[i].nspec);
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| 166 |
new_bsdf_data(inpfile[i].theta, inpfile[i].phi);
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}
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| 168 |
#ifdef DEBUG
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| 169 |
fprintf(stderr, "Loading measurements from '%s'...\n", inpfile[i].fname);
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| 170 |
#endif
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| 171 |
/* read scattering data */
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| 172 |
while (fscanf(fp, "%lf %lf %lf", &theta_out, &phi_out, val) == 3) {
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| 173 |
for (n = 1; n < inpfile[i].nspec; n++)
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| 174 |
if (fscanf(fp, "%lf", val+n) != 1) {
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| 175 |
fprintf(stderr, "%s: warning: unexpected EOF\n",
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| 176 |
inpfile[i].fname);
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| 177 |
fclose(fp);
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| 178 |
return(1);
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}
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| 180 |
/* check if scatter angle is too low */
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| 181 |
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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#ifndef TEST_MAIN
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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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| 206 |
#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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| 210 |
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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| 218 |
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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| 223 |
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| 224 |
/* 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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| 227 |
{
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| 228 |
extern int nprocs;
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| 229 |
static char gval_buf[16];
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| 230 |
char * auto_grazing = NULL;
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| 231 |
const char *symmetry = "0";
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| 232 |
int ninpfiles, totinc;
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| 233 |
int a, i;
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| 234 |
/* set global progname */
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| 235 |
fixargv0(argv[0]);
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| 236 |
/* get options */
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| 237 |
for (a = 1; a < argc && argv[a][0] == '-'; a++)
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| 238 |
switch (argv[a][1]) {
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| 239 |
case 't':
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| 240 |
rev_orient = !rev_orient;
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break;
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| 242 |
case 'n':
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| 243 |
nprocs = atoi(argv[++a]);
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| 244 |
break;
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| 245 |
case 's':
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| 246 |
symmetry = argv[++a];
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| 247 |
break;
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| 248 |
case 'g':
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| 249 |
if (toupper(argv[a+1][0]) == 'A')
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| 250 |
auto_grazing = argv[a+1] = gval_buf;
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| 251 |
else
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| 252 |
lim_graze = atof(argv[a+1]);
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| 253 |
++a;
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| 254 |
break;
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| 255 |
default:
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| 256 |
goto userr;
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| 257 |
}
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| 258 |
totinc = ninpfiles = argc - a; /* initialize & sort inputs */
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| 259 |
if (ninpfiles < 2)
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| 260 |
goto userr;
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| 261 |
if (toupper(symmetry[0]) == SYM_UP) /* special case for "up" symmetry */
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| 262 |
totinc += ninpfiles;
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| 263 |
inpfile = (PGINPUT *)malloc(sizeof(PGINPUT)*totinc);
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| 264 |
if (inpfile == NULL)
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| 265 |
return(1);
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| 266 |
if (auto_grazing)
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| 267 |
lim_graze = 90.;
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| 268 |
for (i = 0; i < ninpfiles; i++) {
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| 269 |
if (!init_pabopto_inp(i, argv[a+i]))
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| 270 |
return(1);
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| 271 |
if (auto_grazing && fabs(inpfile[i].theta - 90.) < lim_graze)
|
| 272 |
lim_graze = fabs(inpfile[i].theta - 90.);
|
| 273 |
}
|
| 274 |
if (auto_grazing)
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| 275 |
sprintf(auto_grazing, "%.2f", lim_graze);
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| 276 |
for (i = ninpfiles; i < totinc; i++) { /* copy for "up" symmetry */
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| 277 |
inpfile[i] = inpfile[i-ninpfiles];
|
| 278 |
inpfile[i].phi += 180.; /* invert duplicate data */
|
| 279 |
inpfile[i].up_phi -= 180.;
|
| 280 |
set_grid_pos(&inpfile[i]); /* grid location for sorting */
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| 281 |
}
|
| 282 |
qsort(inpfile, totinc, sizeof(PGINPUT), cmp_indir);
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| 283 |
/* compile measurements */
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| 284 |
for (i = 0; i < totinc; i++)
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| 285 |
if (!add_pabopto_inp(i))
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| 286 |
return(1);
|
| 287 |
make_rbfrep(); /* process last data set */
|
| 288 |
/* check input symmetry */
|
| 289 |
switch (toupper(symmetry[0])) {
|
| 290 |
case '0': /* unspecified symmetry */
|
| 291 |
if (quadrant_sym[inp_coverage] != SYM_ILL)
|
| 292 |
break; /* anything legal goes */
|
| 293 |
fprintf(stderr, "%s: unsupported phi coverage (%s)\n",
|
| 294 |
progname, quadrant_rep[inp_coverage]);
|
| 295 |
return(1);
|
| 296 |
case SYM_UP: /* faux "up" symmetry */
|
| 297 |
if (quadrant_sym[inp_coverage] == SYM_ANISO)
|
| 298 |
break;
|
| 299 |
/* fall through */
|
| 300 |
case SYM_ISO: /* usual symmetry types */
|
| 301 |
case SYM_QUAD:
|
| 302 |
case SYM_BILAT:
|
| 303 |
case SYM_ANISO:
|
| 304 |
if (quadrant_sym[inp_coverage] == toupper(symmetry[0]))
|
| 305 |
break; /* matches spec */
|
| 306 |
fprintf(stderr,
|
| 307 |
"%s: phi coverage (%s) does not match requested '%s' symmetry\n",
|
| 308 |
progname, quadrant_rep[inp_coverage], symmetry);
|
| 309 |
return(1);
|
| 310 |
default:
|
| 311 |
fprintf(stderr,
|
| 312 |
"%s: -s option must be Isotropic, Quadrilateral, Bilateral, Up, or Anisotropic\n",
|
| 313 |
progname);
|
| 314 |
return(1);
|
| 315 |
}
|
| 316 |
#ifdef DEBUG
|
| 317 |
fprintf(stderr, "Input phi coverage (%s) has '%c' symmetry\n",
|
| 318 |
quadrant_rep[inp_coverage],
|
| 319 |
quadrant_sym[inp_coverage]);
|
| 320 |
#endif
|
| 321 |
build_mesh(); /* create interpolation */
|
| 322 |
SET_FILE_BINARY(stdout); /* start header */
|
| 323 |
newheader("RADIANCE", stdout);
|
| 324 |
printargs(argc, argv, stdout);
|
| 325 |
fputnow(stdout);
|
| 326 |
save_bsdf_rep(stdout); /* complete header + data */
|
| 327 |
return(0);
|
| 328 |
userr:
|
| 329 |
fprintf(stderr, "Usage: %s [-t][-n nproc][-s symmetry][-g angle|'A'] meas1.dat meas2.dat .. > bsdf.sir\n",
|
| 330 |
progname);
|
| 331 |
return(1);
|
| 332 |
}
|
| 333 |
|
| 334 |
#else /* TEST_MAIN */
|
| 335 |
|
| 336 |
/* Test main produces a Radiance model from the given input file */
|
| 337 |
int
|
| 338 |
main(int argc, char *argv[])
|
| 339 |
{
|
| 340 |
PGINPUT pginp;
|
| 341 |
char buf[128];
|
| 342 |
FILE *pfp;
|
| 343 |
double bsdf, min_log;
|
| 344 |
FVECT dir;
|
| 345 |
int i, j, n;
|
| 346 |
|
| 347 |
progname = argv[0];
|
| 348 |
if (argc != 2) {
|
| 349 |
fprintf(stderr, "Usage: %s input.dat > output.rad\n", progname);
|
| 350 |
return(1);
|
| 351 |
}
|
| 352 |
inpfile = &pginp;
|
| 353 |
if (!init_pabopto_inp(0, argv[1]) || !add_pabopto_inp(0))
|
| 354 |
return(1);
|
| 355 |
/* reduce data set */
|
| 356 |
if (make_rbfrep() == NULL) {
|
| 357 |
fprintf(stderr, "%s: nothing to plot!\n", progname);
|
| 358 |
exit(1);
|
| 359 |
}
|
| 360 |
#ifdef DEBUG
|
| 361 |
fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min);
|
| 362 |
#endif
|
| 363 |
min_log = log(bsdf_min*.5 + 1e-5);
|
| 364 |
#if 1 /* produce spheres at meas. */
|
| 365 |
puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n");
|
| 366 |
n = 0;
|
| 367 |
for (i = 0; i < grid_res; i++)
|
| 368 |
for (j = 0; j < grid_res; j++)
|
| 369 |
if (dsf_grid[i][j].sum.n > 0) {
|
| 370 |
ovec_from_pos(dir, i, j);
|
| 371 |
bsdf = dsf_grid[i][j].sum.v /
|
| 372 |
((double)dsf_grid[i][j].sum.n*output_orient*dir[2]);
|
| 373 |
if (bsdf <= bsdf_min*.6)
|
| 374 |
continue;
|
| 375 |
bsdf = log(bsdf + 1e-5) - min_log;
|
| 376 |
ovec_from_pos(dir, i, j);
|
| 377 |
printf("yellow sphere s%04d\n0\n0\n", ++n);
|
| 378 |
printf("4 %.6g %.6g %.6g %.6g\n\n",
|
| 379 |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf,
|
| 380 |
.007*bsdf);
|
| 381 |
}
|
| 382 |
#endif
|
| 383 |
#if 1 /* spheres at RBF peaks */
|
| 384 |
puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n");
|
| 385 |
for (n = 0; n < dsf_list->nrbf; n++) {
|
| 386 |
RBFVAL *rbf = &dsf_list->rbfa[n];
|
| 387 |
ovec_from_pos(dir, rbf->gx, rbf->gy);
|
| 388 |
bsdf = eval_rbfrep(dsf_list, dir);
|
| 389 |
bsdf = log(bsdf + 1e-5) - min_log;
|
| 390 |
printf("red sphere p%04d\n0\n0\n", ++n);
|
| 391 |
printf("4 %.6g %.6g %.6g %.6g\n\n",
|
| 392 |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf,
|
| 393 |
.011*bsdf);
|
| 394 |
}
|
| 395 |
#endif
|
| 396 |
#if 1 /* output continuous surface */
|
| 397 |
puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n");
|
| 398 |
fflush(stdout);
|
| 399 |
sprintf(buf, "gensurf tgreen bsdf - - - %d %d", grid_res-1, grid_res-1);
|
| 400 |
pfp = popen(buf, "w");
|
| 401 |
if (pfp == NULL) {
|
| 402 |
fprintf(stderr, "%s: cannot open '| %s'\n", progname, buf);
|
| 403 |
return(1);
|
| 404 |
}
|
| 405 |
for (i = 0; i < grid_res; i++)
|
| 406 |
for (j = 0; j < grid_res; j++) {
|
| 407 |
ovec_from_pos(dir, i, j);
|
| 408 |
bsdf = eval_rbfrep(dsf_list, dir);
|
| 409 |
bsdf = log(bsdf + 1e-5) - min_log;
|
| 410 |
fprintf(pfp, "%.8e %.8e %.8e\n",
|
| 411 |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf);
|
| 412 |
}
|
| 413 |
if (pclose(pfp) != 0)
|
| 414 |
return(1);
|
| 415 |
#endif
|
| 416 |
return(0);
|
| 417 |
}
|
| 418 |
|
| 419 |
#endif /* TEST_MAIN */
|
