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#include "copyright.h" |
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#include "standard.h" |
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#include "cvmesh.h" |
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#include "triangulate.h" |
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#include <ctype.h> |
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|
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typedef int VNDX[3]; /* vertex index (point,map,normal) */ |
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static int lineno; /* current line number */ |
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static int faceno; /* current face number */ |
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|
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static int getstmt(char *av[MAXARG], FILE *fp); |
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static int cvtndx(VNDX vi, char *vs); |
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static int putface(int ac, char **av); |
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static int getstmt(char *av[MAXARG], FILE *fp); |
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static int cvtndx(VNDX vi, char *vs); |
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static int putface(int ac, char **av); |
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static OBJECT getmod(void); |
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static int puttri(char *v1, char *v2, char *v3); |
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static int puttri(char *v1, char *v2, char *v3); |
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static void freeverts(void); |
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static int newv(double x, double y, double z); |
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static int newvn(double x, double y, double z); |
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static int newvt(double x, double y); |
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static int newv(double x, double y, double z); |
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static int newvn(double x, double y, double z); |
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static int newvt(double x, double y); |
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static void syntax(char *er); |
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return(1); |
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} |
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|
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/* determine dominant axis for triangle */ |
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static int |
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dominant_axis(char *v1, char *v2, char *v3) |
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{ |
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VNDX v1i, v2i, v3i; |
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FVECT e1, e2, vn; |
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int i, imax; |
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|
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if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
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return(-1); |
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VSUB(e1, vlist[v2i[0]], vlist[v1i[0]]); |
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VSUB(e2, vlist[v3i[0]], vlist[v2i[0]]); |
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VCROSS(vn, e1, e2); |
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for (i = imax = 2; i--; ) |
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if (vn[i]*vn[i] > vn[imax]*vn[imax]) |
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imax = i; |
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return(vn[imax]*vn[imax] > FTINY*FTINY*FTINY*FTINY ? imax : -1); |
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} |
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|
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/* struct needed for triangulation callback */ |
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typedef struct { |
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char **avl; |
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int rev; |
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} WFpoly; |
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|
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/* callback for triangle output from polygon */ |
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static int |
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tri_out(const Vert2_list *tp, int a, int b, int c) |
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{ |
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WFpoly * wp = (WFpoly *)tp->p; |
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|
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if (wp->rev) |
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return( puttri(wp->avl[c], wp->avl[b], wp->avl[a]) ); |
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|
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return( puttri(wp->avl[a], wp->avl[b], wp->avl[c]) ); |
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} |
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|
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static int |
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putface( /* put out an N-sided polygon */ |
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int ac, |
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char **av |
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) |
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{ |
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char *cp; |
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int i; |
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Vert2_list *poly; |
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WFpoly myps; |
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int i, ax, ay; |
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|
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while (ac > 3) { /* break into triangles */ |
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if (!puttri(av[0], av[1], av[2])) |
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for (i = ac-3; i >= 0; i--) /* identify dominant axis */ |
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if ((ax = dominant_axis(av[i], av[i+1], av[i+2])) >= 0) |
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break; |
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if (ax < 0) |
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return(1); /* ignore degenerate face */ |
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poly = polyAlloc(ac); |
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if (poly == NULL) |
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return(0); |
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myps.avl = av; |
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poly->p = &myps; |
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if (++ax >= 3) ax = 0; |
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ay = ax; |
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if (++ay >= 3) ay = 0; |
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for (i = 0; i < ac; i++) { /* convert to 2-D polygon */ |
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VNDX vi; |
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if (!cvtndx(vi, av[i])) { |
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error(WARNING, "bad vertex reference"); |
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polyFree(poly); |
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return(0); |
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ac--; /* remove vertex & rotate */ |
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cp = av[0]; |
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for (i = 0; i < ac-1; i++) |
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av[i] = av[i+2]; |
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av[i] = cp; |
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} |
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poly->v[i].mX = vlist[vi[0]][ax]; |
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poly->v[i].mY = vlist[vi[0]][ay]; |
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} |
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return(puttri(av[0], av[1], av[2])); |
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/* flag for order reversal */ |
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myps.rev = (polyArea(poly) < .0); |
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/* break into triangles & output */ |
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if (!polyTriangulate(poly, &tri_out)) { |
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sprintf(errmsg, "self-intersecting face with %d vertices", ac); |
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error(WARNING, errmsg); |
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} |
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polyFree(poly); |
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return(1); |
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} |
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|
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|
| 482 |
|
char *er |
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) |
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{ |
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sprintf(errmsg, "%s: Wavefront syntax error near line %d: %s\n", |
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sprintf(errmsg, "%s: Wavefront syntax error near line %d: %s", |
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inpfile, lineno, er); |
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error(USER, errmsg); |
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} |
