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#include "copyright.h" |
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#include "ray.h" |
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#include <string.h> |
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#include "ray.h" |
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#include "mesh.h" |
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#include "tmesh.h" |
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#define EDGE_CACHE_SIZ 109 /* length of mesh edge cache */ |
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#define EDGE_CACHE_SIZ 251 /* length of mesh edge cache */ |
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#define curmi (edge_cache.mi) |
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#define curmsh (curmi->msh) |
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OBJREC *o; /* mesh object */ |
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MESHINST *mi; /* current mesh instance */ |
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struct EdgeSide { |
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int4 v1i, v2i; /* vertex indices (lowest first) */ |
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int32 v1i, v2i; /* vertex indices (lowest first) */ |
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short signum; /* signed volume */ |
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} cache[EDGE_CACHE_SIZ]; |
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} edge_cache; |
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/* get mesh instance */ |
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edge_cache.mi = getmeshinst(edge_cache.o = o, IO_ALL); |
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/* clear edge cache */ |
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bzero((void *)edge_cache.cache, sizeof(edge_cache.cache)); |
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memset((void *)edge_cache.cache, '\0', sizeof(edge_cache.cache)); |
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} |
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static int |
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signed_volume(r, v1, v2) /* get signed volume for ray and edge */ |
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register RAY *r; |
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int4 v1, v2; |
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int32 v1, v2; |
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{ |
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int reversed = 0; |
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register struct EdgeSide *ecp; |
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if (v1 > v2) { |
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int4 t = v2; v2 = v1; v1 = t; |
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int32 t = v2; v2 = v1; v1 = t; |
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reversed = 1; |
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} |
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ecp = &edge_cache.cache[(v2<<11 ^ v1) % EDGE_CACHE_SIZ]; |
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ecp = &edge_cache.cache[((v2<<11 ^ v1) & 0x7fffffff) % EDGE_CACHE_SIZ]; |
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if (ecp->v1i != v1 || ecp->v2i != v2) { |
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MESHVERT tv1, tv2; /* compute signed volume */ |
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FVECT v2d; |
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double vol; |
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if (!getmeshvert(&tv1, edge_cache.mi->msh, v1, MT_V) || |
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!getmeshvert(&tv2, edge_cache.mi->msh, v2, MT_V)) |
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!getmeshvert(&tv2, edge_cache.mi->msh, v2, MT_V)) |
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objerror(edge_cache.o, INTERNAL, |
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"missing mesh vertex in signed_volume"); |
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"missing mesh vertex in signed_volume"); |
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VSUB(v2d, tv2.v, r->rorg); |
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vol = (tv1.v[0] - r->rorg[0]) * |
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( (tv2.v[1] - r->rorg[1])*r->rdir[2] - |
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(tv2.v[2] - r->rorg[2])*r->rdir[1] ); |
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(v2d[1]*r->rdir[2] - v2d[2]*r->rdir[1]); |
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vol += (tv1.v[1] - r->rorg[1]) * |
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( (tv2.v[2] - r->rorg[2])*r->rdir[0] - |
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(tv2.v[0] - r->rorg[0])*r->rdir[2] ); |
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(v2d[2]*r->rdir[0] - v2d[0]*r->rdir[2]); |
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vol += (tv1.v[2] - r->rorg[2]) * |
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( (tv2.v[0] - r->rorg[0])*r->rdir[1] - |
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(tv2.v[1] - r->rorg[1])*r->rdir[0] ); |
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(v2d[0]*r->rdir[1] - v2d[1]*r->rdir[0]); |
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if (vol > .0) |
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ecp->signum = 1; |
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else if (vol < .0) |
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OBJECT *oset; |
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RAY *r; |
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{ |
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int4 tvi[3]; |
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int32 tvi[3]; |
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int sv1, sv2, sv3; |
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MESHVERT tv[3]; |
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OBJECT tmod; |
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FVECT va, vb, nrm; |
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double d; |
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int i; |
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/* check each triangle */ |
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for (i = oset[0]; i > 0; i--) { |
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if (!getmeshtrivid(tvi, curmsh, oset[i])) |
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if (!getmeshtrivid(tvi, &tmod, curmsh, oset[i])) |
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objerror(edge_cache.o, INTERNAL, |
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"missing triangle vertices in mesh_hit"); |
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"missing triangle vertices in mesh_hit"); |
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sv1 = signed_volume(r, tvi[0], tvi[1]); |
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sv2 = signed_volume(r, tvi[1], tvi[2]); |
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sv3 = signed_volume(r, tvi[2], tvi[0]); |
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r->rot = d; |
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VSUM(r->rop, r->rorg, r->rdir, d); |
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VCOPY(r->ron, nrm); |
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/* normalize(r->ron) called in o_mesh() & rod set */ |
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/* normalize(r->ron) called & r->rod set in o_mesh() */ |
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} |
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} |
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RAY rcont; |
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int flags; |
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MESHVERT tv[3]; |
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FLOAT wt[3]; |
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OBJECT tmod; |
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RREAL wt[3]; |
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int i; |
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/* get the mesh instance */ |
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prep_edge_cache(o); |
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/* copy and transform ray */ |
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copystruct(&rcont, r); |
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rcont = *r; |
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multp3(rcont.rorg, r->rorg, curmi->x.b.xfm); |
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multv3(rcont.rdir, r->rdir, curmi->x.b.xfm); |
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for (i = 0; i < 3; i++) |
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return(0); /* missed */ |
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if (rcont.rot * curmi->x.f.sca >= r->rot) |
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return(0); /* not close enough */ |
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r->robj = objndx(o); /* record new hit */ |
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r->ro = o; |
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/* transform ray back */ |
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r->rot = rcont.rot * curmi->x.f.sca; |
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multp3(r->rop, rcont.rop, curmi->x.f.xfm); |
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multv3(r->ron, rcont.ron, curmi->x.f.xfm); |
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normalize(r->ron); |
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r->rod = -DOT(r->rdir, r->ron); |
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/* compute barycentric weights */ |
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flags = getmeshtri(tv, curmsh, rcont.robj, MT_ALL); |
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/* get triangle */ |
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flags = getmeshtri(tv, &tmod, curmsh, rcont.robj, MT_ALL); |
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if (!(flags & MT_V)) |
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objerror(o, INTERNAL, "missing mesh vertices in o_mesh"); |
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r->robj = objndx(o); /* set object and material */ |
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if (o->omod == OVOID && tmod != OVOID) { |
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r->ro = getmeshpseudo(curmsh, tmod); |
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r->rox = &curmi->x; |
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} else |
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r->ro = o; |
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/* compute barycentric weights */ |
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if (flags & (MT_N|MT_UV)) |
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if (get_baryc(wt, rcont.rop, tv[0].v, tv[1].v, tv[2].v) < 0) { |
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objerror(o, WARNING, "bad triangle in o_mesh"); |
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if (normalize(r->pert) != 0.0) |
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for (i = 0; i < 3; i++) |
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r->pert[i] -= r->ron[i]; |
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} |
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} else |
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r->pert[0] = r->pert[1] = r->pert[2] = .0; |
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> |
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if (flags & MT_UV) /* interpolate uv coordinates */ |
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for (i = 0; i < 2; i++) |
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r->uv[i] = wt[0]*tv[0].uv[i] + |
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wt[1]*tv[1].uv[i] + |
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wt[2]*tv[2].uv[i]; |
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else |
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r->uv[0] = r->uv[1] = .0; |
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/* return hit */ |
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return(1); |
