bool ofxGtsSurface::prepareBoolean(ofxGtsSurface &source) {
if(!loaded || !source.loaded) {
ofLog(OF_LOG_NOTICE, "Gts surface not loaded, could not perform boolean operation");
return false;
}
if(!gts_surface_is_orientable(surface)) {
ofLog(OF_LOG_ERROR, "Gts surface is not an orientable manifold, could not perform boolean operation");
return false;
}
if(gts_surface_is_self_intersecting(surface)) {
ofLog(OF_LOG_ERROR, "Gts surface self-intersects, could not perform boolean operation");
return false;
}
if(!gts_surface_is_orientable(source.surface)) {
ofLog(OF_LOG_ERROR, "Gts surface is not an orientable manifold, could not perform boolean operation");
return false;
}
if(gts_surface_is_self_intersecting(source.surface)) {
ofLog(OF_LOG_ERROR, "Gts surface self-intersects, could not perform boolean operation");
return false;
}
GSList *bboxes = NULL;
gts_surface_foreach_face(surface, (GtsFunc) prepend_triangle_bbox, &bboxes);
/* build bounding box tree for first surface */
tree1 = gts_bb_tree_new(bboxes);
/* free list of bboxes */
g_slist_free (bboxes);
is_open1 = gts_surface_volume(surface) < 0. ? TRUE : FALSE;
/* build bounding boxes for second surface */
bboxes = NULL;
gts_surface_foreach_face(source.surface, (GtsFunc) prepend_triangle_bbox, &bboxes);
/* build bounding box tree for second surface */
tree2 = gts_bb_tree_new(bboxes);
/* free list of bboxes */
g_slist_free (bboxes);
is_open2 = gts_surface_volume (source.surface) < 0. ? TRUE : FALSE;
si = gts_surface_inter_new (gts_surface_inter_class (),
surface, source.surface, tree1, tree2, is_open1, is_open2);
gboolean closed = TRUE;
gts_surface_inter_check(si, &closed);
boolPerformed = true;
if(!closed) {
ofLog(OF_LOG_NOTICE, "Gts surface is not closed, could not perform boolean operation");
return false;
}
return true;
}
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 */
}
/* set - compute set operations between surfaces */
int main (int argc, char * argv[])
{
GtsSurface * s1, * s2, * s3;
GtsSurfaceInter * si;
GNode * tree1, * tree2;
FILE * fptr;
GtsFile * fp;
int c = 0;
gboolean verbose = TRUE;
gboolean inter = FALSE;
gboolean check_self_intersection = FALSE;
gchar * operation, * file1, * file2;
gboolean closed = TRUE, is_open1, is_open2;
if (!setlocale (LC_ALL, "POSIX"))
g_warning ("cannot set locale to POSIX");
/* parse options using getopt */
while (c != EOF) {
#ifdef HAVE_GETOPT_LONG
static struct option long_options[] = {
{"inter", no_argument, NULL, 'i'},
{"self", no_argument, NULL, 's'},
{"help", no_argument, NULL, 'h'},
{"verbose", no_argument, NULL, 'v'}
};
int option_index = 0;
switch ((c = getopt_long (argc, argv, "hvis",
long_options, &option_index))) {
#else /* not HAVE_GETOPT_LONG */
switch ((c = getopt (argc, argv, "hvis"))) {
#endif /* not HAVE_GETOPT_LONG */
case 's': /* self */
check_self_intersection = TRUE;
break;
case 'i': /* inter */
inter = TRUE;
break;
case 'v': /* verbose */
verbose = FALSE;
break;
case 'h': /* help */
fprintf (stderr,
"Usage: set [OPTION] OPERATION FILE1 FILE2\n"
"Compute set operations between surfaces, where OPERATION is either.\n"
"union, inter, diff.\n"
"\n"
" -i --inter output an OOGL (Geomview) representation of the curve\n"
" intersection of the surfaces\n"
" -s --self checks that the surfaces are not self-intersecting\n"
" if one of them is, the set of self-intersecting faces\n"
" is written (as a GtsSurface) on standard output\n"
" -v --verbose do not print statistics about the surface\n"
" -h --help display this help and exit\n"
"\n"
"Reports bugs to %s\n",
GTS_MAINTAINER);
return 0; /* success */
break;
case '?': /* wrong options */
fprintf (stderr, "Try `set --help' for more information.\n");
return 1; /* failure */
}
}
if (optind >= argc) { /* missing OPERATION */
fprintf (stderr,
"set: missing OPERATION\n"
"Try `set --help' for more information.\n");
return 1; /* failure */
}
operation = argv[optind++];
if (optind >= argc) { /* missing FILE1 */
fprintf (stderr,
"set: missing FILE1\n"
"Try `set --help' for more information.\n");
return 1; /* failure */
}
file1 = argv[optind++];
if (optind >= argc) { /* missing FILE2 */
fprintf (stderr,
"set: missing FILE2\n"
"Try `set --help' for more information.\n");
return 1; /* failure */
}
file2 = argv[optind++];
/* open first file */
if ((fptr = fopen (file1, "rt")) == NULL) {
fprintf (stderr, "set: can not open file `%s'\n", file1);
return 1;
}
/* reads in first surface file */
s1 = GTS_SURFACE (gts_object_new (GTS_OBJECT_CLASS (gts_surface_class ())));
fp = gts_file_new (fptr);
if (gts_surface_read (s1, fp)) {
fprintf (stderr, "set: `%s' is not a valid GTS surface file\n",
file1);
fprintf (stderr, "%s:%d:%d: %s\n", file1, fp->line, fp->pos, fp->error);
return 1;
}
gts_file_destroy (fp);
fclose (fptr);
/* open second file */
if ((fptr = fopen (file2, "rt")) == NULL) {
fprintf (stderr, "set: can not open file `%s'\n", file2);
return 1;
}
/* reads in second surface file */
s2 = GTS_SURFACE (gts_object_new (GTS_OBJECT_CLASS (gts_surface_class ())));
fp = gts_file_new (fptr);
if (gts_surface_read (s2, fp)) {
fprintf (stderr, "set: `%s' is not a valid GTS surface file\n",
file2);
fprintf (stderr, "%s:%d:%d: %s\n", file2, fp->line, fp->pos, fp->error);
return 1;
}
gts_file_destroy (fp);
fclose (fptr);
/* display summary information about both surfaces */
if (verbose) {
gts_surface_print_stats (s1, stderr);
gts_surface_print_stats (s2, stderr);
}
/* check that the surfaces are orientable manifolds */
if (!gts_surface_is_orientable (s1)) {
fprintf (stderr, "set: surface `%s' is not an orientable manifold\n",
file1);
return 1;
}
if (!gts_surface_is_orientable (s2)) {
fprintf (stderr, "set: surface `%s' is not an orientable manifold\n",
file2);
return 1;
}
/* check that the surfaces are not self-intersecting */
if (check_self_intersection) {
GtsSurface * self_intersects;
self_intersects = gts_surface_is_self_intersecting (s1);
if (self_intersects != NULL) {
fprintf (stderr, "set: surface `%s' is self-intersecting\n", file1);
if (verbose)
gts_surface_print_stats (self_intersects, stderr);
gts_surface_write (self_intersects, stdout);
gts_object_destroy (GTS_OBJECT (self_intersects));
return 1;
}
self_intersects = gts_surface_is_self_intersecting (s2);
if (self_intersects != NULL) {
fprintf (stderr, "set: surface `%s' is self-intersecting\n", file2);
if (verbose)
gts_surface_print_stats (self_intersects, stderr);
gts_surface_write (self_intersects, stdout);
gts_object_destroy (GTS_OBJECT (self_intersects));
return 1;
}
}
/* build bounding box tree for first surface */
tree1 = gts_bb_tree_surface (s1);
is_open1 = gts_surface_volume (s1) < 0. ? TRUE : FALSE;
/* build bounding box tree for second surface */
tree2 = gts_bb_tree_surface (s2);
is_open2 = gts_surface_volume (s2) < 0. ? TRUE : FALSE;
si = gts_surface_inter_new (gts_surface_inter_class (),
s1, s2, tree1, tree2, is_open1, is_open2);
g_assert (gts_surface_inter_check (si, &closed));
if (!closed) {
fprintf (stderr,
"set: the intersection of `%s' and `%s' is not a closed curve\n",
file1, file2);
return 1;
}
s3 = gts_surface_new (gts_surface_class (),
gts_face_class (),
gts_edge_class (),
gts_vertex_class ());
if (!strcmp (operation, "union")) {
gts_surface_inter_boolean (si, s3, GTS_1_OUT_2);
gts_surface_inter_boolean (si, s3, GTS_2_OUT_1);
}
else if (!strcmp (operation, "inter")) {
gts_surface_inter_boolean (si, s3, GTS_1_IN_2);
gts_surface_inter_boolean (si, s3, GTS_2_IN_1);
}
else if (!strcmp (operation, "diff")) {
gts_surface_inter_boolean (si, s3, GTS_1_OUT_2);
gts_surface_inter_boolean (si, s3, GTS_2_IN_1);
gts_surface_foreach_face (si->s2, (GtsFunc) gts_triangle_revert, NULL);
gts_surface_foreach_face (s2, (GtsFunc) gts_triangle_revert, NULL);
}
else {
fprintf (stderr,
"set: operation `%s' unknown\n"
"Try `set --help' for more information.\n",
operation);
return 1;
}
/* check that the resulting surface is not self-intersecting */
if (check_self_intersection) {
GtsSurface * self_intersects;
self_intersects = gts_surface_is_self_intersecting (s3);
if (self_intersects != NULL) {
fprintf (stderr, "set: the resulting surface is self-intersecting\n");
if (verbose)
gts_surface_print_stats (self_intersects, stderr);
gts_surface_write (self_intersects, stdout);
gts_object_destroy (GTS_OBJECT (self_intersects));
return 1;
}
}
/* display summary information about the resulting surface */
if (verbose)
gts_surface_print_stats (s3, stderr);
/* write resulting surface to standard output */
if (inter) {
printf ("LIST {\n");
g_slist_foreach (si->edges, (GFunc) write_edge, stdout);
printf ("}\n");
}
else {
GTS_POINT_CLASS (gts_vertex_class ())->binary = TRUE;
gts_surface_write (s3, stdout);
}
/* destroy surfaces */
gts_object_destroy (GTS_OBJECT (s1));
gts_object_destroy (GTS_OBJECT (s2));
gts_object_destroy (GTS_OBJECT (s3));
gts_object_destroy (GTS_OBJECT (si));
/* destroy bounding box trees (including bounding boxes) */
gts_bb_tree_destroy (tree1, TRUE);
gts_bb_tree_destroy (tree2, TRUE);
return 0;
}