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Merge branch 'mesh_repair'

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This commit is contained in:
bubnikv 2018-03-16 13:36:58 +01:00
commit efeda3dcdc
2 changed files with 226 additions and 91 deletions
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164
xs/src/libslic3r/TriangleMesh.cpp
View file

@ -988,26 +988,41 @@ void TriangleMeshSlicer::make_loops(std::vector<IntersectionLine> &lines, Polygo
}
}
struct OpenPolyline {
OpenPolyline() {};
OpenPolyline(const IntersectionReference &start, const IntersectionReference &end, Points &&points) :
start(start), end(end), points(std::move(points)), consumed(false) {}
void reverse() {
std::swap(start, end);
std::reverse(points.begin(), points.end());
}
IntersectionReference start;
IntersectionReference end;
Points points;
bool consumed;
};
std::vector<OpenPolyline> open_polylines;
{
// Build a map of lines by edge_a_id and a_id.
std::vector<IntersectionLine*> by_edge_a_id;
std::vector<IntersectionLine*> by_a_id;
by_edge_a_id.reserve(lines.size());
by_a_id.reserve(lines.size());
for (IntersectionLines::iterator line = lines.begin(); line != lines.end(); ++ line) {
if (! line->skip) {
if (line->edge_a_id != -1)
by_edge_a_id.push_back(&(*line)); // [line->edge_a_id].push_back();
if (line->a_id != -1)
by_a_id.push_back(&(*line)); // [line->a_id].push_back(&(*line));
for (IntersectionLine &line : lines) {
if (! line.skip) {
if (line.edge_a_id != -1)
by_edge_a_id.emplace_back(&line);
if (line.a_id != -1)
by_a_id.emplace_back(&line);
}
}
auto by_edge_lower = [](const IntersectionLine* il1, const IntersectionLine *il2) { return il1->edge_a_id < il2->edge_a_id; };
auto by_vertex_lower = [](const IntersectionLine* il1, const IntersectionLine *il2) { return il1->a_id < il2->a_id; };
std::sort(by_edge_a_id.begin(), by_edge_a_id.end(), by_edge_lower);
std::sort(by_a_id.begin(), by_a_id.end(), by_vertex_lower);
// Chain the segments with a greedy algorithm, collect the loops and unclosed polylines.
IntersectionLines::iterator it_line_seed = lines.begin();
CYCLE: while (1) {
for (;;) {
// take first spare line and start a new loop
IntersectionLine *first_line = nullptr;
for (; it_line_seed != lines.end(); ++ it_line_seed)
@ -1019,7 +1034,7 @@ void TriangleMeshSlicer::make_loops(std::vector<IntersectionLine> &lines, Polygo
break;
first_line->skip = true;
Points loop_pts;
loop_pts.push_back(first_line->a);
loop_pts.emplace_back(first_line->a);
IntersectionLine *last_line = first_line;
/*
@ -1057,35 +1072,146 @@ void TriangleMeshSlicer::make_loops(std::vector<IntersectionLine> &lines, Polygo
}
}
if (next_line == nullptr) {
// check whether we closed this loop
// Check whether we closed this loop.
if ((first_line->edge_a_id != -1 && first_line->edge_a_id == last_line->edge_b_id) ||
(first_line->a_id != -1 && first_line->a_id == last_line->b_id)) {
// loop is complete
// The current loop is complete. Add it to the output.
loops->emplace_back(std::move(loop_pts));
#ifdef SLIC3R_TRIANGLEMESH_DEBUG
printf(" Discovered %s polygon of %d points\n", (p.is_counter_clockwise() ? "ccw" : "cw"), (int)p.points.size());
#endif
goto CYCLE;
} else {
// This is an open polyline. Add it to the list of open polylines. These open polylines will processed later.
loop_pts.emplace_back(last_line->b);
open_polylines.emplace_back(OpenPolyline(
IntersectionReference(first_line->a_id, first_line->edge_a_id),
IntersectionReference(last_line->b_id, last_line->edge_b_id), std::move(loop_pts)));
}
// we can't close this loop!
//// push @failed_loops, [@loop];
//#ifdef SLIC3R_TRIANGLEMESH_DEBUG
printf(" Unable to close this loop having %d points\n", (int)loop_pts.size());
//#endif
goto CYCLE;
break;
}
/*
printf("next_line edge_a_id = %d, edge_b_id = %d, a_id = %d, b_id = %d, a = %d,%d, b = %d,%d\n",
next_line->edge_a_id, next_line->edge_b_id, next_line->a_id, next_line->b_id,
next_line->a.x, next_line->a.y, next_line->b.x, next_line->b.y);
*/
loop_pts.push_back(next_line->a);
loop_pts.emplace_back(next_line->a);
last_line = next_line;
next_line->skip = true;
}
}
}
// Now process the open polylines.
if (! open_polylines.empty()) {
// Store the end points of open_polylines into vectors sorted
struct OpenPolylineEnd {
OpenPolylineEnd(OpenPolyline *polyline, bool start) : polyline(polyline), start(start) {}
OpenPolyline *polyline;
// Is it the start or end point?
bool start;
const IntersectionReference& ipref() const { return start ? polyline->start : polyline->end; }
int point_id() const { return ipref().point_id; }
int edge_id () const { return ipref().edge_id; }
};
auto by_edge_lower = [](const OpenPolylineEnd &ope1, const OpenPolylineEnd &ope2) { return ope1.edge_id() < ope2.edge_id(); };
auto by_point_lower = [](const OpenPolylineEnd &ope1, const OpenPolylineEnd &ope2) { return ope1.point_id() < ope2.point_id(); };
std::vector<OpenPolylineEnd> by_edge_id;
std::vector<OpenPolylineEnd> by_point_id;
by_edge_id.reserve(2 * open_polylines.size());
by_point_id.reserve(2 * open_polylines.size());
for (OpenPolyline &opl : open_polylines) {
if (opl.start.edge_id != -1)
by_edge_id .emplace_back(OpenPolylineEnd(&opl, true));
if (opl.end.edge_id != -1)
by_edge_id .emplace_back(OpenPolylineEnd(&opl, false));
if (opl.start.point_id != -1)
by_point_id.emplace_back(OpenPolylineEnd(&opl, true));
if (opl.end.point_id != -1)
by_point_id.emplace_back(OpenPolylineEnd(&opl, false));
}
std::sort(by_edge_id .begin(), by_edge_id .end(), by_edge_lower);
std::sort(by_point_id.begin(), by_point_id.end(), by_point_lower);
// Try to connect the loops.
for (OpenPolyline &opl : open_polylines) {
if (opl.consumed)
continue;
opl.consumed = true;
OpenPolylineEnd end(&opl, false);
for (;;) {
// find a line starting where last one finishes
OpenPolylineEnd* next_start = nullptr;
if (end.edge_id() != -1) {
auto it_begin = std::lower_bound(by_edge_id.begin(), by_edge_id.end(), end, by_edge_lower);
if (it_begin != by_edge_id.end()) {
auto it_end = std::upper_bound(it_begin, by_edge_id.end(), end, by_edge_lower);
for (auto it_edge = it_begin; it_edge != it_end; ++ it_edge)
if (! it_edge->polyline->consumed) {
next_start = &(*it_edge);
break;
}
}
}
if (next_start == nullptr && end.point_id() != -1) {
auto it_begin = std::lower_bound(by_point_id.begin(), by_point_id.end(), end, by_point_lower);
if (it_begin != by_point_id.end()) {
auto it_end = std::upper_bound(it_begin, by_point_id.end(), end, by_point_lower);
for (auto it_point = it_begin; it_point != it_end; ++ it_point)
if (! it_point->polyline->consumed) {
next_start = &(*it_point);
break;
}
}
}
if (next_start == nullptr) {
// The current loop could not be closed. Unmark the segment.
opl.consumed = false;
break;
}
// Attach this polyline to the end of the initial polyline.
if (next_start->start) {
auto it = next_start->polyline->points.begin();
std::copy(++ it, next_start->polyline->points.end(), back_inserter(opl.points));
//opl.points.insert(opl.points.back(), ++ it, next_start->polyline->points.end());
} else {
auto it = next_start->polyline->points.rbegin();
std::copy(++ it, next_start->polyline->points.rend(), back_inserter(opl.points));
//opl.points.insert(opl.points.back(), ++ it, next_start->polyline->points.rend());
}
end = *next_start;
end.start = !end.start;
next_start->polyline->points.clear();
next_start->polyline->consumed = true;
// Check whether we closed this loop.
const IntersectionReference &ip1 = opl.start;
const IntersectionReference &ip2 = end.ipref();
if ((ip1.edge_id != -1 && ip1.edge_id == ip2.edge_id) ||
(ip1.point_id != -1 && ip1.point_id == ip2.point_id)) {
// The current loop is complete. Add it to the output.
assert(opl.points.front().point_id == opl.points.back().point_id);
assert(opl.points.front().edge_id == opl.points.back().edge_id);
// Remove the duplicate last point.
opl.points.pop_back();
if (opl.points.size() >= 3) {
// The closed polygon is patched from pieces with messed up orientation, therefore
// the orientation of the patched up polygon is not known.
// Orient the patched up polygons CCW. This heuristic may close some holes and cavities.
double area = 0.;
for (size_t i = 0, j = opl.points.size() - 1; i < opl.points.size(); j = i ++)
area += double(opl.points[j].x + opl.points[i].x) * double(opl.points[i].y - opl.points[j].y);
if (area < 0)
std::reverse(opl.points.begin(), opl.points.end());
loops->emplace_back(std::move(opl.points));
}
opl.points.clear();
break;
}
// Continue with the current loop.
}
}
}
}
// Only used to cut the mesh into two halves.
void TriangleMeshSlicer::make_expolygons_simple(std::vector<IntersectionLine> &lines, ExPolygons* slices) const
{

15
xs/src/libslic3r/TriangleMesh.hpp
View file

@ -85,11 +85,11 @@ enum FacetEdgeType {
feHorizontal
};
class IntersectionPoint : public Point
class IntersectionReference
{
public:
IntersectionPoint() : point_id(-1), edge_id(-1) {};
// Inherits coord_t x, y
IntersectionReference() : point_id(-1), edge_id(-1) {};
IntersectionReference(int point_id, int edge_id) : point_id(point_id), edge_id(edge_id) {}
// Where is this intersection point located? On mesh vertex or mesh edge?
// Only one of the following will be set, the other will remain set to -1.
// Index of the mesh vertex.
@ -98,6 +98,15 @@ public:
int edge_id;
};
class IntersectionPoint : public Point, public IntersectionReference
{
public:
IntersectionPoint() {};
IntersectionPoint(int point_id, int edge_id, const Point &pt) : IntersectionReference(point_id, edge_id), Point(pt) {}
IntersectionPoint(const IntersectionReference &ir, const Point &pt) : IntersectionReference(ir), Point(pt) {}
// Inherits coord_t x, y
};
class IntersectionLine : public Line
{
public: