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/* Copyright (c) 1994 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Convert a Wavefront .obj file to Radiance format. |
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* |
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#include "trans.h" |
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#include "tmesh.h" |
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#include <ctype.h> |
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#define TCALNAME "tmesh.cal" /* triangle interp. file */ |
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#define PATNAME "M-pat" /* mesh pattern name (reused) */ |
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#define TEXNAME "M-nor" /* mesh texture name (reused) */ |
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#define DEFOBJ "unnamed" /* default object name */ |
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#define DEFMAT "white" /* default material name */ |
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#define ABS(x) ((x)>=0 ? (x) : -(x)) |
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#define pvect(v) printf("%18.12g %18.12g %18.12g\n",(v)[0],(v)[1],(v)[2]) |
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FVECT *vlist; /* our vertex list */ |
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FLOAT (*vtlist)[2]; /* map vertex list */ |
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int nvts; |
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typedef struct { |
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int ax; /* major axis */ |
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FLOAT tm[2][3]; /* transformation */ |
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} BARYCCM; |
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typedef int VNDX[3]; /* vertex index (point,map,normal) */ |
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#define CHUNKSIZ 256 /* vertex allocation chunk size */ |
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char *mod; |
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VNDX v1i, v2i, v3i; |
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BARYCCM bvecs; |
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FVECT bcoor[3]; |
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FLOAT bcoor[3][3]; |
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int texOK, patOK; |
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register int i; |
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if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
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return(0); |
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/* compute barycentric coordinates */ |
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texOK = !flatten && (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0); |
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if (!flatten && v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0) |
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switch (flat_tri(vlist[v1i[0]], vlist[v2i[0]], vlist[v3i[0]], |
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vnlist[v1i[2]], vnlist[v2i[2]], vnlist[v3i[2]])) { |
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case DEGEN: /* zero area */ |
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return(-1); |
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case RVFLAT: /* reversed normals, but flat */ |
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case ISFLAT: /* smoothing unnecessary */ |
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texOK = 0; |
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break; |
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case RVBENT: /* reversed normals with smoothing */ |
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case ISBENT: /* proper smoothing */ |
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texOK = 1; |
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break; |
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} |
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else |
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texOK = 0; |
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#ifdef TEXMAPS |
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patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0); |
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#else |
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} |
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int |
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comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
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register BARYCCM *bcm; |
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FLOAT *v1, *v2, *v3; |
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{ |
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FLOAT *vt; |
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FVECT va, vab, vcb; |
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double d; |
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int ax0, ax1; |
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register int i, j; |
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/* compute major axis */ |
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for (i = 0; i < 3; i++) { |
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vab[i] = v1[i] - v2[i]; |
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vcb[i] = v3[i] - v2[i]; |
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} |
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fcross(va, vab, vcb); |
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bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1; |
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bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2; |
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ax0 = (bcm->ax + 1) % 3; |
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ax1 = (bcm->ax + 2) % 3; |
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for (j = 0; j < 2; j++) { |
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vab[0] = v1[ax0] - v2[ax0]; |
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vcb[0] = v3[ax0] - v2[ax0]; |
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vab[1] = v1[ax1] - v2[ax1]; |
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vcb[1] = v3[ax1] - v2[ax1]; |
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d = vcb[0]*vcb[0] + vcb[1]*vcb[1]; |
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if (d <= FTINY) |
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return(-1); |
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d = (vcb[0]*vab[0]+vcb[1]*vab[1])/d; |
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va[0] = vab[0] - vcb[0]*d; |
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va[1] = vab[1] - vcb[1]*d; |
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d = va[0]*va[0] + va[1]*va[1]; |
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if (d <= FTINY) |
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return(-1); |
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bcm->tm[j][0] = va[0] /= d; |
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bcm->tm[j][1] = va[1] /= d; |
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bcm->tm[j][2] = -(v2[ax0]*va[0]+v2[ax1]*va[1]); |
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/* rotate vertices */ |
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vt = v1; |
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v1 = v2; |
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v2 = v3; |
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v3 = vt; |
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} |
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return(0); |
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} |
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put_baryc(bcm, com, n) /* put barycentric coord. vectors */ |
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register BARYCCM *bcm; |
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register FVECT com[]; |
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int n; |
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{ |
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double a, b; |
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register int i, j; |
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printf("%d\t%d\n", 1+3*n, bcm->ax); |
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for (i = 0; i < n; i++) { |
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a = com[i][0] - com[i][2]; |
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b = com[i][1] - com[i][2]; |
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printf("%14.8f %14.8f %14.8f\n", |
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bcm->tm[0][0]*a + bcm->tm[1][0]*b, |
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bcm->tm[0][1]*a + bcm->tm[1][1]*b, |
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bcm->tm[0][2]*a + bcm->tm[1][2]*b + com[i][2]); |
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} |
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} |
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freeverts() /* free all vertices */ |
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{ |
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if (nvs) { |
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free((char *)vlist); |
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free((void *)vlist); |
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nvs = 0; |
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} |
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if (nvts) { |
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free((char *)vtlist); |
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free((void *)vtlist); |
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nvts = 0; |
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} |
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if (nvns) { |
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free((char *)vnlist); |
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free((void *)vnlist); |
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nvns = 0; |
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} |
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} |
