+void TrackType3D::build_ties(const TrackPart &part, const Profile &profile, float length, float spacing, const Vector &offset, GL::MeshBuilder &bld, unsigned &base_index)
+{
+ float plen = part.get_length();
+ unsigned count = plen/spacing+0.5;
+
+ unsigned n_vertices = profile.get_n_vertices();
+ float min_y = profile.get_min_coords().y;
+ vector<Vector> cap_vertices;
+ for(unsigned i=0; i+1<n_vertices; )
+ {
+ const Profile::Vertex &v = profile.get_vertex(i);
+ if(cap_vertices.size()>=2)
+ {
+ if(i+2<n_vertices)
+ cap_vertices.push_back(Vector(v.pos.x, min_y, 0));
+ else
+ cap_vertices.push_back(profile.get_vertex(n_vertices-1).pos);
+ }
+ cap_vertices.push_back(v.pos);
+
+ ++i;
+ if(!profile.get_vertex(i).smooth)
+ ++i;
+ }
+
+ for(unsigned i=0; i<count; ++i)
+ {
+ OrientedPoint basep = part.get_point((i+0.5)*plen/count);
+ Transform trans = Transform::rotation(basep.rotation, Vector(0, 0, 1));
+
+ unsigned strip = 0;
+ for(unsigned j=0; j<n_vertices; ++j)
+ {
+ const Profile::Vertex &v = profile.get_vertex(j);
+
+ Vector n = trans.transform(Vector(0, -v.normal.x, v.normal.y));
+ bld.normal(n.x, n.y, n.z);
+
+ if(!strip)
+ bld.begin(GL::TRIANGLE_STRIP);
+
+ for(unsigned k=0; k<2; ++k)
+ {
+ Vector p((k-0.5)*length, -v.pos.x, v.pos.y);
+ p = basep.position+trans.transform(offset+p);
+ bld.vertex(p.x, p.y, p.z);
+ }
+
+ if(++strip>=2 && !profile.get_vertex(j).smooth)
+ {
+ bld.end();
+ strip = 0;
+ }
+ }
+ if(strip)
+ bld.end();
+
+ for(unsigned j=0; j<2; ++j)
+ {
+ Vector n = trans.transform(Vector(j*2.0-1, 0, 0));
+ bld.normal(n.x, n.y, n.z);
+
+ bld.begin(GL::TRIANGLE_STRIP);
+ for(unsigned k=0; k<cap_vertices.size(); ++k)
+ {
+ const Vector &v = cap_vertices[k^j];
+ Vector p((j-0.5)*length, -v.x, v.y);
+ p = basep.position+trans.transform(offset+p);
+ bld.vertex(p.x, p.y, p.z);
+ }
+ bld.end();
+ }
+
+ base_index += 2*(n_vertices+cap_vertices.size());
+ }
+}
+