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#939 break up closed loops for swept disk

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This commit is contained in:
Thomas Krijnen
2020-08-09 20:50:39 +02:00
parent 64db48276c
commit 06b512c2e3
1 changed files with 34 additions and 2 deletions
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src/ifcgeom/IfcGeomShapes.cpp
+34 -2
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@@ -1260,6 +1260,34 @@ namespace {
}
}
// #939: a closed loop causes failed triangulation in 7.3 and artefacts
// in 7.4 so we break up a closed wire into two equal parts.
void break_closed(const TopoDS_Wire& wire, std::vector<TopoDS_Wire>& wires) {
std::vector<TopoDS_Edge> sorted_edges;
sort_edges(wire, sorted_edges);
if (sorted_edges.size() == 1) {
wires.push_back(wire);
return;
}
BRep_Builder B;
double u, v;
wires.emplace_back();
B.MakeWire(wires.back());
for (int i = 0; i < sorted_edges.size(); ++i) {
if (i == sorted_edges.size() / 2) {
wires.emplace_back();
B.MakeWire(wires.back());
}
const auto& e = sorted_edges[i];
B.Add(wires.back(), e);
}
}
void segment_adjacent_non_linear(const TopoDS_Wire& wire, std::vector<TopoDS_Wire>& wires) {
std::vector<TopoDS_Edge> sorted_edges;
sort_edges(wire, sorted_edges);
@@ -1294,8 +1322,12 @@ namespace {
// @todo make this generic for other sweeps not just swept disk
void process_sweep(const TopoDS_Wire& wire, double radius, TopoDS_Shape& result) {
std::vector<TopoDS_Wire> wires;
segment_adjacent_non_linear(wire, wires);
std::vector<TopoDS_Wire> wires, wires_tmp;
segment_adjacent_non_linear(wire, wires_tmp);
for (auto& w : wires_tmp) {
break_closed(w, wires);
}
wires.erase(wires.begin() + 1);
TopoDS_Compound C;
BRep_Builder B;