Exemplo n.º 1
0
// grid sampling
Matrix3r woo::Volumetric::tetraInertia_grid(const Vector3r v[4], int div){
	AlignedBox3r b; for(int i:{0,1,2,3}) b.extend(v[i]);
	std::cerr<<"bbox "<<b.min()<<", "<<b.max()<<std::endl;
	Real dd=b.sizes().minCoeff()/div;
	Vector3r xyz;
	// point inside test: http://steve.hollasch.net/cgindex/geometry/ptintet.html
	typedef Eigen::Matrix<Real,4,4> Matrix4r;
	Matrix4r M0; M0<<v[0].transpose(),1,v[1].transpose(),1,v[2].transpose(),1,v[3].transpose(),1;
	Real D0=M0.determinant();
	// Matrix3r I(Matrix3r::Zero());
	Matrix3r C(Matrix3r::Zero());
	Real dV=pow(dd,3);
	// std::ofstream dbg("/tmp/tetra.txt");
	for(xyz.x()=b.min().x()+dd/2.; xyz.x()<b.max().x(); xyz.x()+=dd){
		for(xyz.y()=b.min().y()+dd/2.; xyz.y()<b.max().y(); xyz.y()+=dd){
			for(xyz.z()=b.min().z()+dd/2.; xyz.z()<b.max().z(); xyz.z()+=dd){
				bool inside=true;
				for(int i:{0,1,2,3}){
					Matrix4r D=M0;
					D.row(i).head<3>()=xyz;
					if(std::signbit(D.determinant())!=std::signbit(D0)){ inside=false; break; }
				}
				if(inside){
					C+=dV*(xyz*xyz.transpose());
					// dbg<<xyz[0]<<" "<<xyz[1]<<" "<<xyz[2]<<" "<<dd/2.<<endl;
				}
			}
		}
	}
	return Matrix3r::Identity()*C.trace()-C;
}
Exemplo n.º 2
0
Arquivo: Field.cpp Projeto: woodem/woo
AlignedBox3r Field::renderingBbox() const {
	AlignedBox3r b;
	for(const shared_ptr<Node>& n: nodes){
		if(!n) continue;
		b.extend(n->pos);
	}
	return b;
}
Exemplo n.º 3
0
void SphereClumpGeom::recompute(int _div, bool failOk, bool fastOnly){
	if((centers.empty() && radii.empty()) || centers.size()!=radii.size()){
		if(failOk) { makeInvalid(); return;}
		throw std::runtime_error("SphereClumpGeom.recompute: centers and radii must have the same length (len(centers)="+to_string(centers.size())+", len(radii)="+to_string(radii.size())+"), and may not be empty.");
	}
	div=_div;
	// one single sphere: simple
	if(centers.size()==1){
		pos=centers[0];
		ori=Quaternionr::Identity();
		volume=(4/3.)*M_PI*pow(radii[0],3);
		inertia=Vector3r::Constant((2/5.)*volume*pow(radii[0],2));
		equivRad=radii[0];
		return;
	}
	volume=0;
	Vector3r Sg=Vector3r::Zero();
	Matrix3r Ig=Matrix3r::Zero();
	if(_div<=0){
		// non-intersecting: Steiner's theorem
		for(size_t i=0; i<centers.size(); i++){
			const Real& r(radii[i]); const Vector3r& x(centers[i]);
			Real v=(4/3.)*M_PI*pow(r,3);
			volume+=v;
			Sg+=v*x;
			Ig+=woo::Volumetric::inertiaTensorTranslate(Vector3r::Constant((2/5.)*v*pow(r,2)).asDiagonal(),v,-1.*x);
		}
	} else {
		// intersecting: grid sampling
		Real rMin=Inf; AlignedBox3r aabb;
		for(size_t i=0; i<centers.size(); i++){
			aabb.extend(centers[i]+Vector3r::Constant(radii[i]));
			aabb.extend(centers[i]-Vector3r::Constant(radii[i]));
			rMin=min(rMin,radii[i]);
		}
		if(rMin<=0){
			if(failOk){ makeInvalid(); return; }
			throw std::runtime_error("SphereClumpGeom.recompute: minimum radius must be positive (not "+to_string(rMin)+")");
		}
		Real dx=rMin/_div; Real dv=pow(dx,3);
		long nCellsApprox=(aabb.sizes()/dx).prod();
		 // don't compute anything, it would take too long
		if(fastOnly && nCellsApprox>1e5){ makeInvalid(); return; }
		if(nCellsApprox>1e8) LOG_WARN("SphereClumpGeom: space grid has "<<nCellsApprox<<" cells, computing inertia can take a long time.");
		Vector3r x;
		for(x.x()=aabb.min().x()+dx/2.; x.x()<aabb.max().x(); x.x()+=dx){
			for(x.y()=aabb.min().y()+dx/2.; x.y()<aabb.max().y(); x.y()+=dx){
				for(x.z()=aabb.min().z()+dx/2.; x.z()<aabb.max().z(); x.z()+=dx){
					for(size_t i=0; i<centers.size(); i++){
						if((x-centers[i]).squaredNorm()<pow(radii[i],2)){
							volume+=dv;
							Sg+=dv*x;
							Ig+=dv*(x.dot(x)*Matrix3r::Identity()-x*x.transpose())+/*along princial axes of dv; perhaps negligible?*/Matrix3r(Vector3r::Constant(dv*pow(dx,2)/6.).asDiagonal());
							break;
						}
					}
				}
			}
		}
	}
	woo::Volumetric::computePrincipalAxes(volume,Sg,Ig,pos,ori,inertia);
	equivRad=(inertia.array()/volume).sqrt().mean(); // mean of radii of gyration
}
Exemplo n.º 4
0
AlignedBox3r woo::Sphere::alignedBox() const {
	AlignedBox3r ret; ret.extend(nodes[0]->pos-radius*Vector3r::Ones()); ret.extend(nodes[0]->pos+radius*Vector3r::Ones()); return ret;
}
Exemplo n.º 5
0
int spheroidsToSTL(const string& out, const shared_ptr<DemField>& dem, Real tol, const string& solid, int mask, bool append, bool clipCell, bool merge){
	if(tol==0 || isnan(tol)) throw std::runtime_error("tol must be non-zero.");
	#ifndef WOO_GTS
		if(merge) throw std::runtime_error("woo.triangulated.spheroidsToSTL: merge=True only possible in builds with the 'gts' feature.");
	#endif
	// first traversal to find reference radius
	auto particleOk=[&](const shared_ptr<Particle>&p){ return (mask==0 || (p->mask & mask)) && (p->shape->isA<Sphere>() || p->shape->isA<Ellipsoid>() || p->shape->isA<Capsule>()); };
	int numTri=0;

	if(tol<0){
		LOG_DEBUG("tolerance is negative, taken as relative to minimum radius.");
		Real minRad=Inf;
		for(const auto& p: *dem->particles){
			if(particleOk(p)) minRad=min(minRad,p->shape->equivRadius());
		}
		if(isinf(minRad) || isnan(minRad)) throw std::runtime_error("Minimum radius not found (relative tolerance specified); no matching particles?");
		tol=-minRad*tol;
		LOG_DEBUG("Minimum radius "<<minRad<<".");
	}
	LOG_DEBUG("Triangulation tolerance is "<<tol);
	
	std::ofstream stl(out,append?(std::ofstream::app|std::ofstream::binary):std::ofstream::binary); // binary better, anyway
	if(!stl.good()) throw std::runtime_error("Failed to open output file "+out+" for writing.");

	Scene* scene=dem->scene;
	if(!scene) throw std::logic_error("DEM field has not associated scene?");

	// periodicity, cache that for later use
	AlignedBox3r cell;

	/*
	wasteful memory-wise, but we need to store the whole triangulation in case *merge* is in effect,
	when it is only an intermediary result and will not be output as-is
	*/
	vector<vector<Vector3r>> ppts;
	vector<vector<Vector3i>> ttri;
	vector<Particle::id_t> iid;

	for(const auto& p: *dem->particles){
		if(!particleOk(p)) continue;
		const auto sphere=dynamic_cast<Sphere*>(p->shape.get());
		const auto ellipsoid=dynamic_cast<Ellipsoid*>(p->shape.get());
		const auto capsule=dynamic_cast<Capsule*>(p->shape.get());
		vector<Vector3r> pts;
		vector<Vector3i> tri;
		if(sphere || ellipsoid){
			Real r=sphere?sphere->radius:ellipsoid->semiAxes.minCoeff();
			// 1 is for icosahedron
			int tess=ceil(M_PI/(5*acos(1-tol/r)));
			LOG_DEBUG("Tesselation level for #"<<p->id<<": "<<tess);
			tess=max(tess,0);
			auto uSphTri(CompUtils::unitSphereTri20(/*0 for icosahedron*/max(tess-1,0)));
			const auto& uPts=std::get<0>(uSphTri); // unit sphere point coords
			pts.resize(uPts.size());
			const auto& node=(p->shape->nodes[0]);
			Vector3r scale=(sphere?sphere->radius*Vector3r::Ones():ellipsoid->semiAxes);
			for(size_t i=0; i<uPts.size(); i++){
				pts[i]=node->loc2glob(uPts[i].cwiseProduct(scale));
			}
			tri=std::get<1>(uSphTri); // this makes a copy, but we need out own for capsules
		}
		if(capsule){
			#ifdef WOO_VTK
				int subdiv=max(4.,ceil(M_PI/(acos(1-tol/capsule->radius))));
				std::tie(pts,tri)=VtkExport::triangulateCapsule(static_pointer_cast<Capsule>(p->shape),subdiv);
			#else
				throw std::runtime_error("Triangulation of capsules is (for internal and entirely fixable reasons) only available when compiled with the 'vtk' features.");
			#endif
		}
		// do not write out directly, store first for later
		ppts.push_back(pts);
		ttri.push_back(tri);
		LOG_TRACE("#"<<p->id<<" triangulated: "<<tri.size()<<","<<pts.size()<<" faces,vertices.");

		if(scene->isPeriodic){
			// make sure we have aabb, in skewed coords and such
			if(!p->shape->bound){
				// this is a bit ugly, but should do the trick; otherwise we would recompute all that ourselves here
				if(sphere) Bo1_Sphere_Aabb().go(p->shape);
				else if(ellipsoid) Bo1_Ellipsoid_Aabb().go(p->shape);
				else if(capsule) Bo1_Capsule_Aabb().go(p->shape);
			}
			assert(p->shape->bound);
			const AlignedBox3r& box(p->shape->bound->box);
			AlignedBox3r cell(Vector3r::Zero(),scene->cell->getSize()); // possibly in skewed coords
			// central offset
			Vector3i off0;
			scene->cell->canonicalizePt(p->shape->nodes[0]->pos,off0); // computes off0
			Vector3i off; // offset from the original cell
			//cerr<<"#"<<p->id<<" at "<<p->shape->nodes[0]->pos.transpose()<<", off0="<<off0<<endl;
			for(off[0]=off0[0]-1; off[0]<=off0[0]+1; off[0]++) for(off[1]=off0[1]-1; off[1]<=off0[1]+1; off[1]++) for(off[2]=off0[2]-1; off[2]<=off0[2]+1; off[2]++){
				Vector3r dx=scene->cell->intrShiftPos(off);
				//cerr<<"  off="<<off.transpose()<<", dx="<<dx.transpose()<<endl;
				AlignedBox3r boxOff(box); boxOff.translate(dx);
				//cerr<<"  boxOff="<<boxOff.min()<<";"<<boxOff.max()<<" | cell="<<cell.min()<<";"<<cell.max()<<endl;
				if(boxOff.intersection(cell).isEmpty()) continue;
				// copy the entire triangulation, offset by dx
				vector<Vector3r> pts2(pts); for(auto& p: pts2) p+=dx;
				vector<Vector3i> tri2(tri); // same topology
				ppts.push_back(pts2);
				ttri.push_back(tri2);
				LOG_TRACE("  offset "<<off.transpose()<<": #"<<p->id<<": "<<tri2.size()<<","<<pts2.size()<<" faces,vertices.");
			}
		}
	}

	if(!merge){
		LOG_DEBUG("Will export (unmerged) "<<ppts.size()<<" particles to STL.");
		stl<<"solid "<<solid<<"\n";
		for(size_t i=0; i<ppts.size(); i++){
			const auto& pts(ppts[i]);
			const auto& tri(ttri[i]);
			LOG_TRACE("Exporting "<<i<<" with "<<tri.size()<<" faces.");
			for(const Vector3i& t: tri){
				Vector3r pp[]={pts[t[0]],pts[t[1]],pts[t[2]]};
				// skip triangles which are entirely out of the canonical periodic cell
				if(scene->isPeriodic && clipCell && (!scene->cell->isCanonical(pp[0]) && !scene->cell->isCanonical(pp[1]) && !scene->cell->isCanonical(pp[2]))) continue;
				numTri++;
				Vector3r n=(pp[1]-pp[0]).cross(pp[2]-pp[1]).normalized();
				stl<<"  facet normal "<<n.x()<<" "<<n.y()<<" "<<n.z()<<"\n";
				stl<<"    outer loop\n";
				for(auto p: {pp[0],pp[1],pp[2]}){
					stl<<"      vertex "<<p[0]<<" "<<p[1]<<" "<<p[2]<<"\n";
				}
				stl<<"    endloop\n";
				stl<<"  endfacet\n";
			}
		}
		stl<<"endsolid "<<solid<<"\n";
		stl.close();
		return numTri;
	}

#if WOO_GTS
	/*****
	Convert all triangulation to GTS surfaces, find their distances, isolate connected components,
	merge these components incrementally and write to STL
	*****/

	// total number of points
	const size_t N(ppts.size());
	// bounds for collision detection
	struct Bound{
		Bound(Real _coord, int _id, bool _isMin): coord(_coord), id(_id), isMin(_isMin){};
		Bound(): coord(NaN), id(-1), isMin(false){}; // just for allocation
		Real coord;
		int id;
		bool isMin;
		bool operator<(const Bound& b) const { return coord<b.coord; }
	};
	vector<Bound> bounds[3]={vector<Bound>(2*N),vector<Bound>(2*N),vector<Bound>(2*N)};
	/* construct GTS surface objects; all objects must be deleted explicitly! */
	vector<GtsSurface*> ssurf(N);
	vector<vector<GtsVertex*>> vvert(N);
	vector<vector<GtsEdge*>> eedge(N);
	vector<AlignedBox3r> boxes(N);
	for(size_t i=0; i<N; i++){
		LOG_TRACE("** Creating GTS surface for #"<<i<<", with "<<ttri[i].size()<<" faces, "<<ppts[i].size()<<" vertices.");
		AlignedBox3r box;
		// new surface object
		ssurf[i]=gts_surface_new(gts_surface_class(),gts_face_class(),gts_edge_class(),gts_vertex_class());
		// copy over all vertices
		vvert[i].reserve(ppts[i].size());
		eedge[i].reserve(size_t(1.5*ttri[i].size())); // each triangle consumes 1.5 edges, for closed surfs
		for(size_t v=0; v<ppts[i].size(); v++){
			vvert[i].push_back(gts_vertex_new(gts_vertex_class(),ppts[i][v][0],ppts[i][v][1],ppts[i][v][2]));
			box.extend(ppts[i][v]);
		}
		// create faces, and create edges on the fly as needed
		std::map<std::pair<int,int>,int> edgeIndices;
		for(size_t t=0; t<ttri[i].size(); t++){
			//const Vector3i& t(ttri[i][t]);
			//LOG_TRACE("Face with vertices "<<ttri[i][t][0]<<","<<ttri[i][t][1]<<","<<ttri[i][t][2]);
			Vector3i eIxs;
			for(int a:{0,1,2}){
				int A(ttri[i][t][a]), B(ttri[i][t][(a+1)%3]);
				auto AB=std::make_pair(min(A,B),max(A,B));
				auto ABI=edgeIndices.find(AB);
				if(ABI==edgeIndices.end()){ // this edge not created yet
					edgeIndices[AB]=eedge[i].size(); // last index 
					eIxs[a]=eedge[i].size();
					//LOG_TRACE("  New edge #"<<eIxs[a]<<": "<<A<<"--"<<B<<" (length "<<(ppts[i][A]-ppts[i][B]).norm()<<")");
					eedge[i].push_back(gts_edge_new(gts_edge_class(),vvert[i][A],vvert[i][B]));
				} else {
					eIxs[a]=ABI->second;
					//LOG_TRACE("  Found edge #"<<ABI->second<<" for "<<A<<"--"<<B);
				}
			}
			//LOG_TRACE("  New face: edges "<<eIxs[0]<<"--"<<eIxs[1]<<"--"<<eIxs[2]);
			GtsFace* face=gts_face_new(gts_face_class(),eedge[i][eIxs[0]],eedge[i][eIxs[1]],eedge[i][eIxs[2]]);
			gts_surface_add_face(ssurf[i],face);
		}
		// make sure the surface is OK
		if(!gts_surface_is_orientable(ssurf[i])) LOG_ERROR("Surface of #"+to_string(iid[i])+" is not orientable (expect troubles).");
		if(!gts_surface_is_closed(ssurf[i])) LOG_ERROR("Surface of #"+to_string(iid[i])+" is not closed (expect troubles).");
		assert(!gts_surface_is_self_intersecting(ssurf[i]));
		// copy bounds
		LOG_TRACE("Setting bounds of surf #"<<i);
		boxes[i]=box;
		for(int ax:{0,1,2}){
			bounds[ax][2*i+0]=Bound(box.min()[ax],/*id*/i,/*isMin*/true);
			bounds[ax][2*i+1]=Bound(box.max()[ax],/*id*/i,/*isMin*/false);
		}
	}

	/*
	broad-phase collision detection between GTS surfaces
	only those will be probed with exact algorithms below and merged if needed
	*/
	for(int ax:{0,1,2}) std::sort(bounds[ax].begin(),bounds[ax].end());
	vector<Bound>& bb(bounds[0]); // run the search along x-axis, does not matter really
	std::list<std::pair<int,int>> int0; // broad-phase intersections
	for(size_t i=0; i<2*N; i++){
		if(!bb[i].isMin) continue; // only start with lower bound
		// go up to the upper bound, but handle overflow safely (no idea why it would happen here) as well
		for(size_t j=i+1; j<2*N && bb[j].id!=bb[i].id; j++){
			if(bb[j].isMin) continue; // this is handled by symmetry
			#if EIGEN_VERSION_AT_LEAST(3,2,5)
				if(!boxes[bb[i].id].intersects(boxes[bb[j].id])) continue; // no intersection along all axes
			#else
				// old, less elegant
				if(boxes[bb[i].id].intersection(boxes[bb[j].id]).isEmpty()) continue; 
			#endif
			int0.push_back(std::make_pair(min(bb[i].id,bb[j].id),max(bb[i].id,bb[j].id)));
			LOG_TRACE("Broad-phase collision "<<int0.back().first<<"+"<<int0.back().second);
		}
	}

	/*
	narrow-phase collision detection between GTS surface
	this must be done via gts_surface_inter_new, since gts_surface_distance always succeeds
	*/
	std::list<std::pair<int,int>> int1;
	for(const std::pair<int,int> ij: int0){
		LOG_TRACE("Testing narrow-phase collision "<<ij.first<<"+"<<ij.second);
		#if 0
			GtsRange gr1, gr2;
			gts_surface_distance(ssurf[ij.first],ssurf[ij.second],/*delta ??*/(gfloat).2,&gr1,&gr2);
			if(gr1.min>0 && gr2.min>0) continue;
			LOG_TRACE("  GTS reports collision "<<ij.first<<"+"<<ij.second<<" (min. distances "<<gr1.min<<", "<<gr2.min);
		#else
			GtsSurface *s1(ssurf[ij.first]), *s2(ssurf[ij.second]);
			GNode* t1=gts_bb_tree_surface(s1);
			GNode* t2=gts_bb_tree_surface(s2);
			GtsSurfaceInter* I=gts_surface_inter_new(gts_surface_inter_class(),s1,s2,t1,t2,/*is_open_1*/false,/*is_open_2*/false);
			GSList* l=gts_surface_intersection(s1,s2,t1,t2); // list of edges describing intersection
			int n1=g_slist_length(l);
			// extra check by looking at number of faces of the intersected surface
			#if 1
				GtsSurface* s12=gts_surface_new(gts_surface_class(),gts_face_class(),gts_edge_class(),gts_vertex_class());
				gts_surface_inter_boolean(I,s12,GTS_1_OUT_2);
				gts_surface_inter_boolean(I,s12,GTS_2_OUT_1);
				int n2=gts_surface_face_number(s12);
				gts_object_destroy(GTS_OBJECT(s12));
			#endif
			gts_bb_tree_destroy(t1,TRUE);
			gts_bb_tree_destroy(t2,TRUE);
			gts_object_destroy(GTS_OBJECT(I));
			g_slist_free(l);
			if(n1==0) continue;
			#if 1
				if(n2==0){ LOG_ERROR("n1==0 but n2=="<<n2<<" (no narrow-phase collision)"); continue; }
			#endif
			LOG_TRACE("  GTS reports collision "<<ij.first<<"+"<<ij.second<<" ("<<n<<" edges describe the intersection)");
		#endif
		int1.push_back(ij);
	}
	/*
	connected components on the graph: graph nodes are 0…(N-1), graph edges are in int1
	see http://stackoverflow.com/a/37195784/761090
	*/
	typedef boost::subgraph<boost::adjacency_list<boost::vecS,boost::vecS,boost::undirectedS,boost::property<boost::vertex_index_t,int>,boost::property<boost::edge_index_t,int>>> Graph;
	Graph graph(N);
	for(const auto& ij: int1) boost::add_edge(ij.first,ij.second,graph);
	vector<size_t> clusters(boost::num_vertices(graph));
	size_t numClusters=boost::connected_components(graph,clusters.data());
	for(size_t n=0; n<numClusters; n++){
		// beginning cluster #n
		// first, count how many surfaces are in this cluster; if 1, things are easier
		int numThisCluster=0; int cluster1st=-1;
		for(size_t i=0; i<N; i++){ if(clusters[i]!=n) continue; numThisCluster++; if(cluster1st<0) cluster1st=(int)i; }
		GtsSurface* clusterSurf=NULL;
		LOG_DEBUG("Cluster "<<n<<" has "<<numThisCluster<<" surfaces.");
		if(numThisCluster==1){
			clusterSurf=ssurf[cluster1st]; 
		} else {
			clusterSurf=ssurf[cluster1st]; // surface of the cluster itself
			LOG_TRACE("  Initial cluster surface from "<<cluster1st<<".");
			/* composed surface */
			for(size_t i=0; i<N; i++){
				if(clusters[i]!=n || ((int)i)==cluster1st) continue;
				LOG_TRACE("   Adding "<<i<<" to the cluster");
				// ssurf[i] now belongs to cluster #n
				// trees need to be rebuild every time anyway, since the merged surface keeps changing in every cycle
				//if(gts_surface_face_number(clusterSurf)==0) LOG_ERROR("clusterSurf has 0 faces.");
				//if(gts_surface_face_number(ssurf[i])==0) LOG_ERROR("Surface #"<<i<<" has 0 faces.");
				GNode* t1=gts_bb_tree_surface(clusterSurf);
				GNode* t2=gts_bb_tree_surface(ssurf[i]);
				GtsSurfaceInter* I=gts_surface_inter_new(gts_surface_inter_class(),clusterSurf,ssurf[i],t1,t2,/*is_open_1*/false,/*is_open_2*/false);
				GtsSurface* merged=gts_surface_new(gts_surface_class(),gts_face_class(),gts_edge_class(),gts_vertex_class());
				gts_surface_inter_boolean(I,merged,GTS_1_OUT_2);
				gts_surface_inter_boolean(I,merged,GTS_2_OUT_1);
				gts_object_destroy(GTS_OBJECT(I));
				gts_bb_tree_destroy(t1,TRUE);
				gts_bb_tree_destroy(t2,TRUE);
				if(gts_surface_face_number(merged)==0){
					LOG_ERROR("Cluster #"<<n<<": 0 faces after fusing #"<<i<<" (why?), adding #"<<i<<" separately!");
					// this will cause an extra 1-particle cluster to be created
					clusters[i]=numClusters;
					numClusters+=1;
				} else {
					// not from global vectors (cleanup at the end), explicit delete!
					if(clusterSurf!=ssurf[cluster1st]) gts_object_destroy(GTS_OBJECT(clusterSurf));
					clusterSurf=merged;
				}
			}
		}
		#if 0
			LOG_TRACE("  GTS surface cleanups...");
	 		pygts_vertex_cleanup(clusterSurf,.1*tol); // cleanup 10× smaller than tolerance
		   pygts_edge_cleanup(clusterSurf);
	      pygts_face_cleanup(clusterSurf);
		#endif
		LOG_TRACE("  STL: cluster "<<n<<" output");
		stl<<"solid "<<solid<<"_"<<n<<"\n";
		/* output cluster to STL here */
		_gts_face_to_stl_data data(stl,scene,clipCell,numTri);
		gts_surface_foreach_face(clusterSurf,(GtsFunc)_gts_face_to_stl,(gpointer)&data);
		stl<<"endsolid\n";
		if(clusterSurf!=ssurf[cluster1st]) gts_object_destroy(GTS_OBJECT(clusterSurf));
	}
	// this deallocates also edges and vertices
	for(size_t i=0; i<ssurf.size(); i++) gts_object_destroy(GTS_OBJECT(ssurf[i]));
	return numTri;
#endif /* WOO_GTS */
}