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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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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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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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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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putobjrow(row1, n); |
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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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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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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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printf(vformat, rp->p[0], rp->p[1], rp->p[2]); |
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if (smooth) |
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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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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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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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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); |
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fvsum(v2, p1->p, p3->p, -1.0); |
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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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p0n = p0->valid; |
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p1n = p1->valid; |
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p2n = p2->valid; |
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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, p0n, p0->valid, |
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p1->valid, p1n, p1->valid, |
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p3->valid, p3n, p3->valid, |
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p2->valid, p2n, p2->valid); |
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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, p0n, p0->valid, |
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p1->valid, p1n, p1->valid, |
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p2->valid, p2n, p2->valid); |
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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, p2n, p2->valid, |
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p1->valid, p1n, p1->valid, |
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p3->valid, p3n, p3->valid); |
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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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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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} |