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greg |
2.1 |
#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Convert PAB-Opto measurements to XML format using tensor tree representation |
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* Employs Bonneel et al. Earth Mover's Distance interpolant. |
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* |
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* G.Ward |
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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 "bsdf.h" |
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#ifndef GRIDRES |
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#define GRIDRES 200 /* max. grid resolution per side */ |
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#endif |
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#define RSCA 1.9 /* radius scaling factor (empirical) */ |
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#define MSCA .12 /* magnitude scaling (empirical) */ |
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typedef struct { |
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float vsum; /* BSDF sum */ |
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unsigned short nval; /* number of values in sum */ |
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unsigned short hrad2; /* half radius squared */ |
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} GRIDVAL; /* grid value */ |
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typedef struct { |
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float bsdf; /* BSDF value at peak */ |
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unsigned short rad; /* radius */ |
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unsigned char gx, gy; /* grid position */ |
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} RBFVAL; /* radial basis function value */ |
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typedef struct s_rbflist { |
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struct s_rbflist *next; /* next in our RBF list */ |
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FVECT invec; /* incident vector direction */ |
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int nrbf; /* number of RBFs */ |
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RBFVAL rbfa[1]; /* RBF array (extends struct) */ |
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} RBFLIST; /* RBF representation of BSDF @ 1 incidence */ |
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/* our loaded grid for this incident angle */ |
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static double theta_in_deg, phi_in_deg; |
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static GRIDVAL bsdf_grid[GRIDRES][GRIDRES]; |
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/* processed incident BSDF measurements */ |
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static RBFLIST *bsdf_list = NULL; |
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/* Count up non-empty nodes and build RBF representation from current grid */ |
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static RBFLIST * |
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make_rbfrep(void) |
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{ |
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int nn = 0; |
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RBFLIST *newnode; |
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int i, j; |
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/* count non-empty bins */ |
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for (i = 0; i < GRIDRES; i++) |
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for (j = 0; j < GRIDRES; j++) |
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nn += (bsdf_grid[i][j].nval > 0); |
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/* allocate RBF array */ |
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newnode = (RBFLIST *)malloc(sizeof(RBFLIST) + sizeof(RBFVAL)*(nn-1)); |
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if (newnode == NULL) { |
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fputs("Out of memory in make_rbfrep\n", stderr); |
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exit(1); |
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} |
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newnode->invec[2] = sin(M_PI/180.*theta_in_deg); |
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newnode->invec[0] = cos(M_PI/180.*phi_in_deg)*newnode->invec[2]; |
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newnode->invec[1] = sin(M_PI/180.*phi_in_deg)*newnode->invec[2]; |
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newnode->invec[2] = sqrt(1. - newnode->invec[2]*newnode->invec[2]); |
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newnode->nrbf = nn; |
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nn = 0; /* fill RBF array */ |
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for (i = 0; i < GRIDRES; i++) |
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for (j = 0; j < GRIDRES; j++) |
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if (bsdf_grid[i][j].nval) { |
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newnode->rbfa[nn].bsdf = MSCA*bsdf_grid[i][j].vsum / |
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(double)bsdf_grid[i][j].nval; |
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newnode->rbfa[nn].rad = |
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(int)(2.*RSCA*sqrt((double)bsdf_grid[i][j].hrad2) + .5); |
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newnode->rbfa[nn].gx = i; |
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newnode->rbfa[nn].gy = j; |
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++nn; |
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} |
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newnode->next = bsdf_list; |
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return(bsdf_list = newnode); |
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} |
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/* Compute grid position from normalized outgoing vector */ |
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static void |
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pos_from_vec(int pos[2], const FVECT vec) |
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{ |
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double sq[2]; /* uniform hemispherical projection */ |
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double norm = 1./sqrt(1. + vec[2]); |
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SDdisk2square(sq, vec[0]*norm, vec[1]*norm); |
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pos[0] = (int)(sq[0]*GRIDRES); |
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pos[1] = (int)(sq[1]*GRIDRES); |
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} |
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/* Compute outgoing vector from grid position */ |
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static void |
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vec_from_pos(FVECT vec, int xpos, int ypos) |
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{ |
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double uv[2]; |
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double r2; |
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SDsquare2disk(uv, (1./GRIDRES)*(xpos+.5), (1./GRIDRES)*(ypos+.5)); |
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/* uniform hemispherical projection */ |
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r2 = uv[0]*uv[0] + uv[1]*uv[1]; |
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vec[0] = vec[1] = sqrt(2. - r2); |
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vec[0] *= uv[0]; |
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vec[1] *= uv[1]; |
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vec[2] = 1. - r2; |
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} |
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/* Evaluate RBF at this grid position */ |
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static double |
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eval_rbfrep2(const RBFLIST *rp, int xi, int yi) |
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{ |
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double res = .0; |
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const RBFVAL *rbfp; |
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double sig2; |
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int x2, y2; |
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int n; |
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rbfp = rp->rbfa; |
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for (n = rp->nrbf; n--; rbfp++) { |
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x2 = (signed)rbfp->gx - xi; |
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x2 *= x2; |
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y2 = (signed)rbfp->gy - yi; |
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y2 *= y2; |
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sig2 = -.5*(x2 + y2)/(double)(rbfp->rad*rbfp->rad); |
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if (sig2 > -19.) |
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res += rbfp->bsdf * exp(sig2); |
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} |
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return(res); |
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} |
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/* Evaluate RBF for BSDF at the given normalized outgoing direction */ |
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static double |
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eval_rbfrep(const RBFLIST *rp, const FVECT outvec) |
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{ |
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double res = .0; |
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const RBFVAL *rbfp; |
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FVECT odir; |
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double sig2; |
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int n; |
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rbfp = rp->rbfa; |
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for (n = rp->nrbf; n--; rbfp++) { |
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vec_from_pos(odir, rbfp->gx, rbfp->gy); |
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sig2 = (DOT(odir, outvec) - 1.) / |
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((M_PI*M_PI/(double)(GRIDRES*GRIDRES)) * |
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rbfp->rad*rbfp->rad); |
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if (sig2 > -19.) |
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res += rbfp->bsdf * exp(sig2); |
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} |
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return(res); |
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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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load_bsdf_meas(const char *fname) |
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{ |
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FILE *fp = fopen(fname, "r"); |
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int inp_is_DSF = -1; |
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double theta_out, phi_out, val; |
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char buf[2048]; |
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int n, 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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memset(bsdf_grid, 0, sizeof(bsdf_grid)); |
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/* read header information */ |
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while ((c = getc(fp)) == '#' || c == EOF) { |
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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 (!strcmp(buf, "format: theta phi DSF\n")) { |
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inp_is_DSF = 1; |
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continue; |
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} |
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if (!strcmp(buf, "format: theta phi BSDF\n")) { |
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inp_is_DSF = 0; |
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continue; |
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} |
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if (sscanf(buf, "intheta %lf", &theta_in_deg) == 1) |
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continue; |
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if (sscanf(buf, "inphi %lf", &phi_in_deg) == 1) |
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continue; |
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if (sscanf(buf, "incident_angle %lf %lf", |
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&theta_in_deg, &phi_in_deg) == 2) |
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continue; |
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} |
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if (inp_is_DSF < 0) { |
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fputs(fname, stderr); |
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fputs(": unknown format\n", stderr); |
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fclose(fp); |
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return(0); |
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} |
| 210 |
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ungetc(c, fp); /* read actual data */ |
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while (fscanf(fp, "%lf %lf %lf\n", &theta_out, &phi_out, &val) == 3) { |
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FVECT ovec; |
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int pos[2]; |
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| 215 |
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ovec[2] = sin(M_PI/180.*theta_out); |
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ovec[0] = cos(M_PI/180.*phi_out) * ovec[2]; |
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ovec[1] = sin(M_PI/180.*phi_out) * ovec[2]; |
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ovec[2] = sqrt(1. - ovec[2]*ovec[2]); |
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| 220 |
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if (inp_is_DSF) |
| 221 |
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val /= ovec[2]; /* convert from DSF to BSDF */ |
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| 223 |
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pos_from_vec(pos, ovec); |
| 224 |
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bsdf_grid[pos[0]][pos[1]].vsum += val; |
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bsdf_grid[pos[0]][pos[1]].nval++; |
| 227 |
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} |
| 228 |
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n = 0; |
| 229 |
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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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fname, n); |
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fclose(fp); |
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return(1); |
| 237 |
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} |
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/* Compute radii for non-empty bins */ |
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/* (distance to furthest empty bin for which non-empty bin is the closest) */ |
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static void |
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compute_radii(void) |
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{ |
| 244 |
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unsigned char fill_grid[GRIDRES][GRIDRES]; |
| 245 |
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int r, r2, lastr2; |
| 246 |
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int i, j, jn, ii, jj, inear, jnear; |
| 247 |
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/* proceed in zig-zag */ |
| 248 |
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lastr2 = GRIDRES*GRIDRES; |
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for (i = 0; i < GRIDRES; i++) |
| 250 |
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for (jn = 0; jn < GRIDRES; jn++) { |
| 251 |
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j = (i&1) ? jn : GRIDRES-1-jn; |
| 252 |
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if (bsdf_grid[i][j].nval) /* find empty grid pos. */ |
| 253 |
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continue; |
| 254 |
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r = (int)sqrt((double)lastr2) + 2; |
| 255 |
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inear = jnear = -1; /* find nearest non-empty */ |
| 256 |
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lastr2 = 2*GRIDRES*GRIDRES; |
| 257 |
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for (ii = i-r; ii <= i+r; ii++) { |
| 258 |
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if (ii < 0) continue; |
| 259 |
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if (ii >= GRIDRES) break; |
| 260 |
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for (jj = j-r; jj <= j+r; jj++) { |
| 261 |
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if (jj < 0) continue; |
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if (jj >= GRIDRES) break; |
| 263 |
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if (!bsdf_grid[ii][jj].nval) |
| 264 |
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continue; |
| 265 |
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r2 = (ii-i)*(ii-i) + (jj-j)*(jj-j); |
| 266 |
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if (r2 >= lastr2) |
| 267 |
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continue; |
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lastr2 = r2; |
| 269 |
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inear = ii; jnear = jj; |
| 270 |
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} |
| 271 |
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} |
| 272 |
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/* record if > previous */ |
| 273 |
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if (bsdf_grid[inear][jnear].hrad2 < lastr2) |
| 274 |
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bsdf_grid[inear][jnear].hrad2 = lastr2; |
| 275 |
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} |
| 276 |
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/* fill in others */ |
| 277 |
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memset(fill_grid, 0, sizeof(fill_grid)); |
| 278 |
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for (i = 0; i < GRIDRES; i++) |
| 279 |
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for (j = 0; j < GRIDRES; j++) { |
| 280 |
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if (!bsdf_grid[i][j].nval) |
| 281 |
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continue; |
| 282 |
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if (bsdf_grid[i][j].hrad2) |
| 283 |
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continue; |
| 284 |
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r = GRIDRES/20; |
| 285 |
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lastr2 = 2*r*r; |
| 286 |
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for (ii = i-r; ii <= i+r; ii++) { |
| 287 |
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if (ii < 0) continue; |
| 288 |
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if (ii >= GRIDRES) break; |
| 289 |
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for (jj = j-r; jj <= j+r; jj++) { |
| 290 |
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if (jj < 0) continue; |
| 291 |
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if (jj >= GRIDRES) break; |
| 292 |
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if (!bsdf_grid[ii][jj].hrad2) |
| 293 |
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continue; |
| 294 |
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r2 = (ii-i)*(ii-i) + (jj-j)*(jj-j); |
| 295 |
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if (r2 >= lastr2) |
| 296 |
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continue; |
| 297 |
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fill_grid[i][j] = bsdf_grid[ii][jj].hrad2; |
| 298 |
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lastr2 = r2; |
| 299 |
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} |
| 300 |
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} |
| 301 |
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} |
| 302 |
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for (i = 0; i < GRIDRES; i++) |
| 303 |
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for (j = 0; j < GRIDRES; j++) |
| 304 |
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if (fill_grid[i][j]) |
| 305 |
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bsdf_grid[i][j].hrad2 = fill_grid[i][j]; |
| 306 |
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} |
| 307 |
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| 308 |
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/* Cull points for more uniform distribution */ |
| 309 |
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static void |
| 310 |
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cull_values(void) |
| 311 |
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{ |
| 312 |
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int i, j, ii, jj, r, r2; |
| 313 |
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/* simple greedy algorithm */ |
| 314 |
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for (i = 0; i < GRIDRES; i++) |
| 315 |
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for (j = 0; j < GRIDRES; j++) { |
| 316 |
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if (!bsdf_grid[i][j].nval) |
| 317 |
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continue; |
| 318 |
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if (!bsdf_grid[i][j].hrad2) |
| 319 |
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continue; |
| 320 |
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r = (int)(2.*sqrt((double)bsdf_grid[i][j].hrad2) + .9999); |
| 321 |
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for (ii = i-r; ii <= i+r; ii++) { |
| 322 |
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if (ii < 0) continue; |
| 323 |
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if (ii >= GRIDRES) break; |
| 324 |
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for (jj = j-r; jj <= j+r; jj++) { |
| 325 |
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if (jj < 0) continue; |
| 326 |
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if (jj >= GRIDRES) break; |
| 327 |
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if (!bsdf_grid[ii][jj].nval) |
| 328 |
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continue; |
| 329 |
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r2 = (ii-i)*(ii-i) + (jj-j)*(jj-j); |
| 330 |
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if (!r2 | (r2 > r*r)) |
| 331 |
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continue; |
| 332 |
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/* absorb victim's value */ |
| 333 |
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bsdf_grid[i][j].vsum += bsdf_grid[ii][jj].vsum; |
| 334 |
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bsdf_grid[i][j].nval += bsdf_grid[ii][jj].nval; |
| 335 |
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memset(&bsdf_grid[ii][jj], 0, sizeof(GRIDVAL)); |
| 336 |
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} |
| 337 |
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} |
| 338 |
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} |
| 339 |
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} |
| 340 |
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| 341 |
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| 342 |
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#if 1 |
| 343 |
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/* Test main produces a Radiance model from the given input file */ |
| 344 |
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int |
| 345 |
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main(int argc, char *argv[]) |
| 346 |
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{ |
| 347 |
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char buf[128]; |
| 348 |
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FILE *pfp; |
| 349 |
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double bsdf; |
| 350 |
|
|
FVECT dir; |
| 351 |
|
|
int i, j, n; |
| 352 |
|
|
|
| 353 |
|
|
if (argc != 2) { |
| 354 |
|
|
fprintf(stderr, "Usage: %s input.dat > output.rad\n", argv[0]); |
| 355 |
|
|
return(1); |
| 356 |
|
|
} |
| 357 |
|
|
if (!load_bsdf_meas(argv[1])) |
| 358 |
|
|
return(1); |
| 359 |
|
|
/* produce spheres at meas. */ |
| 360 |
|
|
puts("void plastic orange\n0\n0\n5 .6 .4 .01 .04 .08\n"); |
| 361 |
|
|
n = 0; |
| 362 |
|
|
for (i = 0; i < GRIDRES; i++) |
| 363 |
|
|
for (j = 0; j < GRIDRES; j++) |
| 364 |
|
|
if (bsdf_grid[i][j].nval) { |
| 365 |
|
|
double bsdf = bsdf_grid[i][j].vsum / |
| 366 |
|
|
(double)bsdf_grid[i][j].nval; |
| 367 |
|
|
FVECT dir; |
| 368 |
|
|
|
| 369 |
|
|
vec_from_pos(dir, i, j); |
| 370 |
|
|
printf("orange sphere s%04d\n0\n0\n", ++n); |
| 371 |
|
|
printf("4 %.6g %.6g %.6g .0015\n\n", |
| 372 |
|
|
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); |
| 373 |
|
|
} |
| 374 |
|
|
compute_radii(); |
| 375 |
|
|
cull_values(); |
| 376 |
|
|
/* highlight chosen values */ |
| 377 |
|
|
puts("void plastic pink\n0\n0\n5 .5 .05 .9 .04 .08\n"); |
| 378 |
|
|
n = 0; |
| 379 |
|
|
for (i = 0; i < GRIDRES; i++) |
| 380 |
|
|
for (j = 0; j < GRIDRES; j++) |
| 381 |
|
|
if (bsdf_grid[i][j].nval) { |
| 382 |
|
|
bsdf = bsdf_grid[i][j].vsum / |
| 383 |
|
|
(double)bsdf_grid[i][j].nval; |
| 384 |
|
|
vec_from_pos(dir, i, j); |
| 385 |
|
|
printf("pink cone c%04d\n0\n0\n8\n", ++n); |
| 386 |
|
|
printf("\t%.6g %.6g %.6g\n", |
| 387 |
|
|
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); |
| 388 |
|
|
printf("\t%.6g %.6g %.6g\n", |
| 389 |
|
|
dir[0]*(bsdf+.005), dir[1]*(bsdf+.005), |
| 390 |
|
|
dir[2]*(bsdf+.005)); |
| 391 |
|
|
puts("\t.003\t0\n"); |
| 392 |
|
|
} |
| 393 |
|
|
/* output continuous surface */ |
| 394 |
|
|
make_rbfrep(); |
| 395 |
|
|
puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 .9\n"); |
| 396 |
|
|
fflush(stdout); |
| 397 |
|
|
sprintf(buf, "gensurf tgreen bsdf - - - %d %d", GRIDRES, GRIDRES); |
| 398 |
|
|
pfp = popen(buf, "w"); |
| 399 |
|
|
if (pfp == NULL) { |
| 400 |
|
|
fputs(buf, stderr); |
| 401 |
|
|
fputs(": cannot start command\n", stderr); |
| 402 |
|
|
return(1); |
| 403 |
|
|
} |
| 404 |
|
|
for (i = 0; i < GRIDRES; i++) |
| 405 |
|
|
for (j = 0; j < GRIDRES; j++) { |
| 406 |
|
|
vec_from_pos(dir, i, j); |
| 407 |
|
|
bsdf = eval_rbfrep(bsdf_list, dir); |
| 408 |
|
|
fprintf(pfp, "%.8e %.8e %.8e\n", |
| 409 |
|
|
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); |
| 410 |
|
|
} |
| 411 |
|
|
return(pclose(pfp)==0 ? 0 : 1); |
| 412 |
|
|
} |
| 413 |
|
|
#endif |
