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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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#include "rtotypes.h" |
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#define EDGE_CACHE_SIZ 251 /* length of mesh 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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volume_sign(r, v1, v2) /* get signed volume for ray and edge */ |
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register RAY *r; |
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int32 v1, v2; |
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{ |
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reversed = 1; |
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} |
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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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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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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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objerror(edge_cache.o, INTERNAL, |
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"missing mesh vertex in signed_volume"); |
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"missing mesh vertex in volume_sign"); |
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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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(v2d[1]*r->rdir[2] - v2d[2]*r->rdir[1]); |
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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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(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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ecp->signum = -1; |
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else |
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ecp->signum = 0; |
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/* don't generate 0 */ |
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ecp->signum = vol > .0 ? 1 : -1; |
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ecp->v1i = v1; |
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ecp->v2i = v2; |
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} |
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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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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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if (sv1 != sv2 || sv2 != sv3) /* compare volume signs */ |
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if (sv1 && sv2 && sv3) |
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continue; |
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sv1 = volume_sign(r, tvi[0], tvi[1]); |
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sv2 = volume_sign(r, tvi[1], tvi[2]); |
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sv3 = volume_sign(r, tvi[2], tvi[0]); |
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/* compare volume signs */ |
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if ((sv1 != sv2) | (sv2 != sv3)) |
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continue; |
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/* compute intersection */ |
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getmeshvert(&tv[0], curmsh, tvi[0], MT_V); |
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getmeshvert(&tv[1], curmsh, tvi[1], MT_V); |
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} |
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int |
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o_mesh(o, r) /* compute ray intersection with a mesh */ |
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OBJREC *o; |
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register RAY *r; |
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extern int |
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o_mesh( /* compute ray intersection with a mesh */ |
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OBJREC *o, |
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register RAY *r |
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) |
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{ |
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RAY rcont; |
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int flags; |
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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++) |
