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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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/* Copyright (c) 1989 Regents of the University of California */ |
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/* |
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* gensurf.c - program to generate functional surfaces |
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* |
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* rule applied to (s,t). |
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* |
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* 4/3/87 |
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* |
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* 4/16/02 Added conditional vertex output |
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*/ |
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#include "standard.h" |
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char XNAME[] = "X`SYS`"; /* x function name */ |
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char YNAME[] = "Y`SYS`"; /* y function name */ |
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char ZNAME[] = "Z`SYS`"; /* z function name */ |
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char XNAME[] = "X`SYS"; /* x function name */ |
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char YNAME[] = "Y`SYS"; /* y function name */ |
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char ZNAME[] = "Z`SYS"; /* z function name */ |
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|
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char VNAME[] = "valid"; /* valid vertex name */ |
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|
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#define ABS(x) ((x)>=0 ? (x) : -(x)) |
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#define ZEROVECT(v) (DOT(v,v) <= FTINY*FTINY) |
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|
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#define pvect(p) printf(vformat, (p)[0], (p)[1], (p)[2]) |
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|
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char vformat[] = "%15.9g %15.9g %15.9g\n"; |
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char texname[] = "Phong"; |
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|
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int smooth = 0; /* apply smoothing? */ |
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int objout = 0; /* output .OBJ format? */ |
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char *modname, *surfname; |
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extern double funvalue(), argument(); |
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typedef struct { |
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int valid; /* point is valid (vertex number) */ |
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FVECT p; /* vertex position */ |
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FVECT n; /* average normal */ |
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FLOAT uv[2]; /* (u,v) position */ |
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} POINT; |
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fcompile(argv[++i]); |
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else if (!strcmp(argv[i], "-s")) |
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smooth++; |
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else if (!strcmp(argv[i], "-o")) |
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objout++; |
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else |
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goto userror; |
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comprow(0.0, row1, n); |
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comprow(1.0/m, row2, n); |
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compnorms(row0, row1, row2, n); |
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if (objout) { |
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printf("\nusemtl %s\n\n", modname); |
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putobjrow(row1, n); |
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} |
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/* for each row */ |
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for (i = 0; i < m; i++) { |
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/* compute next row */ |
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row2 = rp; |
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comprow((double)(i+2)/m, row2, n); |
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compnorms(row0, row1, row2, n); |
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if (objout) |
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putobjrow(row1, n); |
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|
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for (j = 0; j < n; j++) { |
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int orient = (j & 1); |
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/* put polygons */ |
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if ((i+j) & 1) |
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if (!(row0[j].valid && row1[j+1].valid)) |
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orient = 1; |
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else if (!(row1[j].valid && row0[j+1].valid)) |
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orient = 0; |
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if (orient) |
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putsquare(&row0[j], &row1[j], |
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&row0[j+1], &row1[j+1]); |
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else |
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int m, n; |
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int pointsize; |
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{ |
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extern char *fgetword(); |
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FILE *fp; |
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char word[64]; |
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register int size; |
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} |
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putobjrow(rp, n) /* output vertex row to .OBJ */ |
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register POINT *rp; |
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int n; |
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{ |
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static int nverts = 0; |
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|
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for ( ; n-- >= 0; rp++) { |
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if (!rp->valid) |
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continue; |
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fputs("v ", stdout); |
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pvect(rp->p); |
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if (smooth && !ZEROVECT(rp->n)) |
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printf("\tvn %.9g %.9g %.9g\n", |
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rp->n[0], rp->n[1], rp->n[2]); |
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printf("\tvt %.9g %.9g\n", rp->uv[0], rp->uv[1]); |
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rp->valid = ++nverts; |
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} |
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} |
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|
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|
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putsquare(p0, p1, p2, p3) /* put out a square */ |
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POINT *p0, *p1, *p2, *p3; |
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{ |
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FVECT v1, v2, vc1, vc2; |
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int ok1, ok2; |
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/* compute exact normals */ |
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fvsum(v1, p1->p, p0->p, -1.0); |
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fvsum(v2, p2->p, p0->p, -1.0); |
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fcross(vc1, v1, v2); |
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ok1 = normalize(vc1) != 0.0; |
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fvsum(v1, p2->p, p3->p, -1.0); |
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fvsum(v2, p1->p, p3->p, -1.0); |
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fcross(vc2, v1, v2); |
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ok2 = normalize(vc2) != 0.0; |
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ok1 = (p0->valid && p1->valid && p2->valid); |
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if (ok1) { |
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VSUB(v1, p1->p, p0->p); |
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VSUB(v2, p2->p, p0->p); |
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fcross(vc1, v1, v2); |
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ok1 = (normalize(vc1) != 0.0); |
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} |
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ok2 = (p1->valid && p2->valid && p3->valid); |
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if (ok2) { |
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VSUB(v1, p2->p, p3->p); |
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VSUB(v2, p1->p, p3->p); |
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fcross(vc2, v1, v2); |
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ok2 = (normalize(vc2) != 0.0); |
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} |
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if (!(ok1 | ok2)) |
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return; |
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if (objout) { /* output .OBJ faces */ |
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int p0n=0, p1n=0, p2n=0, p3n=0; |
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if (smooth) { |
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if (!ZEROVECT(p0->n)) |
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p0n = p0->valid; |
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if (!ZEROVECT(p1->n)) |
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p1n = p1->valid; |
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if (!ZEROVECT(p2->n)) |
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p2n = p2->valid; |
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if (!ZEROVECT(p3->n)) |
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p3n = p3->valid; |
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} |
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if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) { |
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printf("f %d/%d/%d %d/%d/%d %d/%d/%d %d/%d/%d\n", |
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p0->valid, p0->valid, p0n, |
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p1->valid, p1->valid, p1n, |
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p3->valid, p3->valid, p3n, |
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p2->valid, p2->valid, p2n); |
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return; |
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} |
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if (ok1) |
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printf("f %d/%d/%d %d/%d/%d %d/%d/%d\n", |
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p0->valid, p0->valid, p0n, |
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p1->valid, p1->valid, p1n, |
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p2->valid, p2->valid, p2n); |
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if (ok2) |
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printf("f %d/%d/%d %d/%d/%d %d/%d/%d\n", |
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p2->valid, p2->valid, p2n, |
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p1->valid, p1->valid, p1n, |
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p3->valid, p3->valid, p3n); |
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return; |
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} |
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/* compute normal interpolation */ |
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axis = norminterp(norm, p0, p1, p2, p3); |
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{ |
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double st[2]; |
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int end; |
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int checkvalid; |
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register int i; |
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if (smooth) { |
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end = siz; |
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} |
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st[0] = s; |
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checkvalid = (fundefined(VNAME) == 2); |
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while (i <= end) { |
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st[1] = (double)i/siz; |
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row[i].p[0] = funvalue(XNAME, 2, st); |
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row[i].p[1] = funvalue(YNAME, 2, st); |
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row[i].p[2] = funvalue(ZNAME, 2, st); |
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if (checkvalid && funvalue(VNAME, 2, st) <= 0.0) { |
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row[i].valid = 0; |
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row[i].p[0] = row[i].p[1] = row[i].p[2] = 0.0; |
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row[i].uv[0] = row[i].uv[1] = 0.0; |
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} else { |
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row[i].valid = 1; |
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row[i].p[0] = funvalue(XNAME, 2, st); |
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row[i].p[1] = funvalue(YNAME, 2, st); |
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row[i].p[2] = funvalue(ZNAME, 2, st); |
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row[i].uv[0] = st[0]; |
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row[i].uv[1] = st[1]; |
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} |
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i++; |
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} |
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} |
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if (!smooth) /* not needed if no smoothing */ |
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return; |
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/* compute middle points */ |
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/* compute row 1 normals */ |
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while (siz-- >= 0) { |
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fvsum(v1, r2[0].p, r0[0].p, -1.0); |
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fvsum(v2, r1[1].p, r1[-1].p, -1.0); |
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if (!r1[0].valid) |
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continue; |
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if (!r0[0].valid) { |
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if (!r2[0].valid) { |
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r1[0].n[0] = r1[0].n[1] = r1[0].n[2] = 0.0; |
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continue; |
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} |
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fvsum(v1, r2[0].p, r1[0].p, -1.0); |
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} else if (!r2[0].valid) |
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fvsum(v1, r1[0].p, r0[0].p, -1.0); |
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else |
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fvsum(v1, r2[0].p, r0[0].p, -1.0); |
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if (!r1[-1].valid) { |
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if (!r1[1].valid) { |
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r1[0].n[0] = r1[0].n[1] = r1[0].n[2] = 0.0; |
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continue; |
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} |
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fvsum(v2, r1[1].p, r1[0].p, -1.0); |
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} else if (!r1[1].valid) |
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fvsum(v2, r1[0].p, r1[-1].p, -1.0); |
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else |
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fvsum(v2, r1[1].p, r1[-1].p, -1.0); |
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fcross(r1[0].n, v1, v2); |
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normalize(r1[0].n); |
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r0++; r1++; r2++; |
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} |
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|
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void |
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eputs(msg) |
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char *msg; |
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{ |
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} |
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void |
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wputs(msg) |
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char *msg; |
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{ |
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} |
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|
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void |
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quit(code) |
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int code; |
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{ |