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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* gensurf.c - program to generate functional surfaces |
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#include "standard.h" |
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#include "paths.h" |
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#include "calcomp.h" |
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|
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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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#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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char vformat[] = "%15.9g %15.9g %15.9g\n"; |
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char texname[] = "Phong"; |
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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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struct { |
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int flags; /* data type */ |
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short m, n; /* number of s and t values */ |
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FLOAT *data; /* the data itself, s major sort */ |
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RREAL *data; /* the data itself, s major sort */ |
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} datarec; /* our recorded data */ |
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/* XXX this is redundant with rt/noise3.c, should go to a library */ |
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double l_hermite(), l_bezier(), l_bspline(), l_dataval(); |
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extern double funvalue(), argument(); |
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typedef struct { |
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int valid; /* point is valid */ |
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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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RREAL uv[2]; /* (u,v) position */ |
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} POINT; |
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void loaddata(char *file, int m, int n, int pointsize); |
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double l_dataval(char *nam); |
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void putobjrow(POINT *rp, int n); |
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void putsquare(POINT *p0, POINT *p1, POINT *p2, POINT *p3); |
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void comprow(double s, POINT *row, int siz); |
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void compnorms(POINT *r0, POINT *r1, POINT *r2, int siz); |
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int norminterp(FVECT resmat[4], POINT *p0, POINT *p1, POINT *p2, POINT *p3); |
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void printhead(int ac, char **av); |
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|
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int |
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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extern long eclock; |
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POINT *row0, *row1, *row2, *rp; |
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int i, j, m, n; |
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char stmp[256]; |
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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 (!(row0[j].valid & row1[j+1].valid)) |
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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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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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} |
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} |
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quit(0); |
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return 0; |
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userror: |
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fprintf(stderr, "Usage: %s material name ", argv[0]); |
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fprintf(stderr, "x(s,t) y(s,t) z(s,t) m n [-s][-e expr][-f file]\n"); |
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quit(1); |
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return 1; |
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} |
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loaddata(file, m, n, pointsize) /* load point data from file */ |
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char *file; |
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int m, n; |
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int pointsize; |
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void |
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loaddata( /* load point data from file */ |
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char *file, |
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int m, |
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int n, |
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int pointsize |
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) |
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{ |
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FILE *fp; |
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char word[64]; |
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register int size; |
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register FLOAT *dp; |
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register RREAL *dp; |
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datarec.flags = HASBORDER; /* assume border values */ |
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datarec.m = m+1; |
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size = datarec.m*datarec.n*pointsize; |
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if (pointsize == 3) |
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datarec.flags |= TRIPLETS; |
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dp = (FLOAT *)malloc(size*sizeof(FLOAT)); |
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dp = (RREAL *)malloc(size*sizeof(RREAL)); |
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if ((datarec.data = dp) == NULL) { |
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fputs("Out of memory\n", stderr); |
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exit(1); |
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size--; |
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} |
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if (size == (m+n+1)*pointsize) { /* no border after all */ |
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dp = (FLOAT *)realloc((char *)datarec.data, |
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m*n*pointsize*sizeof(FLOAT)); |
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dp = (RREAL *)realloc((void *)datarec.data, |
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m*n*pointsize*sizeof(RREAL)); |
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if (dp != NULL) |
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datarec.data = dp; |
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datarec.flags &= ~HASBORDER; |
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double |
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l_dataval(nam) /* return recorded data value */ |
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char *nam; |
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l_dataval( /* return recorded data value */ |
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char *nam |
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) |
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{ |
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double u, v; |
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register int i, j; |
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register FLOAT *dp; |
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register RREAL *dp; |
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double d00, d01, d10, d11; |
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/* compute coordinates */ |
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u = argument(1); v = argument(2); |
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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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void |
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putobjrow( /* 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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{ |
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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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void |
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putsquare( /* put out a square */ |
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POINT *p0, |
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POINT *p1, |
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POINT *p2, |
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POINT *p3 |
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) |
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{ |
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static int nout = 0; |
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FVECT norm[4]; |
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int axis; |
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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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< |
ok1 = (p0->valid & p1->valid & p2->valid); |
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> |
ok1 = (p0->valid && p1->valid && p2->valid); |
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if (ok1) { |
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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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> |
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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> |
ok2 = (p1->valid && p2->valid && p3->valid); |
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if (ok2) { |
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< |
fvsum(v1, p2->p, p3->p, -1.0); |
338 |
< |
fvsum(v2, p1->p, p3->p, -1.0); |
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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); |
341 |
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} |
342 |
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if (!(ok1 | ok2)) |
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return; |
344 |
+ |
if (objout) { /* output .OBJ faces */ |
345 |
+ |
int p0n=0, p1n=0, p2n=0, p3n=0; |
346 |
+ |
if (smooth) { |
347 |
+ |
if (!ZEROVECT(p0->n)) |
348 |
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p0n = p0->valid; |
349 |
+ |
if (!ZEROVECT(p1->n)) |
350 |
+ |
p1n = p1->valid; |
351 |
+ |
if (!ZEROVECT(p2->n)) |
352 |
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p2n = p2->valid; |
353 |
+ |
if (!ZEROVECT(p3->n)) |
354 |
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p3n = p3->valid; |
355 |
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} |
356 |
+ |
if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) { |
357 |
+ |
printf("f %d/%d/%d %d/%d/%d %d/%d/%d %d/%d/%d\n", |
358 |
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p0->valid, p0->valid, p0n, |
359 |
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p1->valid, p1->valid, p1n, |
360 |
+ |
p3->valid, p3->valid, p3n, |
361 |
+ |
p2->valid, p2->valid, p2n); |
362 |
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return; |
363 |
+ |
} |
364 |
+ |
if (ok1) |
365 |
+ |
printf("f %d/%d/%d %d/%d/%d %d/%d/%d\n", |
366 |
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p0->valid, p0->valid, p0n, |
367 |
+ |
p1->valid, p1->valid, p1n, |
368 |
+ |
p2->valid, p2->valid, p2n); |
369 |
+ |
if (ok2) |
370 |
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printf("f %d/%d/%d %d/%d/%d %d/%d/%d\n", |
371 |
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p2->valid, p2->valid, p2n, |
372 |
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p1->valid, p1->valid, p1n, |
373 |
+ |
p3->valid, p3->valid, p3n); |
374 |
+ |
return; |
375 |
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} |
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/* compute normal interpolation */ |
377 |
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axis = norminterp(norm, p0, p1, p2, p3); |
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|
441 |
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} |
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|
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|
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< |
comprow(s, row, siz) /* compute row of values */ |
445 |
< |
double s; |
446 |
< |
register POINT *row; |
447 |
< |
int siz; |
444 |
> |
void |
445 |
> |
comprow( /* compute row of values */ |
446 |
> |
double s, |
447 |
> |
register POINT *row, |
448 |
> |
int siz |
449 |
> |
) |
450 |
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{ |
451 |
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double st[2]; |
452 |
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int end; |
469 |
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if (checkvalid && funvalue(VNAME, 2, st) <= 0.0) { |
470 |
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row[i].valid = 0; |
471 |
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row[i].p[0] = row[i].p[1] = row[i].p[2] = 0.0; |
472 |
+ |
row[i].uv[0] = row[i].uv[1] = 0.0; |
473 |
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} else { |
474 |
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row[i].valid = 1; |
475 |
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row[i].p[0] = funvalue(XNAME, 2, st); |
476 |
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row[i].p[1] = funvalue(YNAME, 2, st); |
477 |
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row[i].p[2] = funvalue(ZNAME, 2, st); |
478 |
+ |
row[i].uv[0] = st[0]; |
479 |
+ |
row[i].uv[1] = st[1]; |
480 |
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} |
481 |
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i++; |
482 |
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} |
483 |
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} |
484 |
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|
485 |
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|
486 |
< |
compnorms(r0, r1, r2, siz) /* compute row of averaged normals */ |
487 |
< |
register POINT *r0, *r1, *r2; |
488 |
< |
int siz; |
486 |
> |
void |
487 |
> |
compnorms( /* compute row of averaged normals */ |
488 |
> |
register POINT *r0, |
489 |
> |
register POINT *r1, |
490 |
> |
register POINT *r2, |
491 |
> |
int siz |
492 |
> |
) |
493 |
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{ |
494 |
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FVECT v1, v2; |
495 |
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|
527 |
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|
528 |
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|
529 |
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int |
530 |
< |
norminterp(resmat, p0, p1, p2, p3) /* compute normal interpolation */ |
531 |
< |
register FVECT resmat[4]; |
532 |
< |
POINT *p0, *p1, *p2, *p3; |
530 |
> |
norminterp( /* compute normal interpolation */ |
531 |
> |
register FVECT resmat[4], |
532 |
> |
POINT *p0, |
533 |
> |
POINT *p1, |
534 |
> |
POINT *p2, |
535 |
> |
POINT *p3 |
536 |
> |
) |
537 |
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{ |
538 |
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#define u ((ax+1)%3) |
539 |
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#define v ((ax+2)%3) |
610 |
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} |
611 |
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|
612 |
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|
613 |
< |
printhead(ac, av) /* print command header */ |
614 |
< |
register int ac; |
615 |
< |
register char **av; |
613 |
> |
void |
614 |
> |
printhead( /* print command header */ |
615 |
> |
register int ac, |
616 |
> |
register char **av |
617 |
> |
) |
618 |
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{ |
619 |
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putchar('#'); |
620 |
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while (ac--) { |
626 |
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|
627 |
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|
628 |
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double |
629 |
< |
l_hermite() |
629 |
> |
l_hermite(char *nm) |
630 |
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{ |
631 |
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double t; |
632 |
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|
639 |
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|
640 |
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|
641 |
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double |
642 |
< |
l_bezier() |
642 |
> |
l_bezier(char *nm) |
643 |
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{ |
644 |
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double t; |
645 |
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|
652 |
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|
653 |
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|
654 |
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double |
655 |
< |
l_bspline() |
655 |
> |
l_bspline(char *nm) |
656 |
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{ |
657 |
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double t; |
658 |
|
|