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ENH: speed up the wall generator process by using bounding box

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Signed-off-by: qing.zhang <qing.zhang@bambulab.com>
Change-Id: Ifccbb33bc6df28136746f98020ef2cad002b5868
This commit is contained in:
qing.zhang 2023-03-06 15:13:36 +08:00 • committed by Lane.Wei
parent aba824bbb9
commit fdd659cefe
3 changed files with 122 additions and 11 deletions
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92
src/libslic3r/ClipperUtils.cpp
View file

@ -57,8 +57,96 @@ err:
#endif /* CLIPPER_UTILS_DEBUG */
namespace ClipperUtils {
Points EmptyPathsProvider::s_empty_points;
Points SinglePathProvider::s_end;
Points EmptyPathsProvider::s_empty_points;
Points SinglePathProvider::s_end;
// Clip source polygon to be used as a clipping polygon with a bouding box around the source (to be clipped) polygon.
// Useful as an optimization for expensive ClipperLib operations, for example when clipping source polygons one by one
// with a set of polygons covering the whole layer below.
template<typename PointType> inline void clip_clipper_polygon_with_subject_bbox_templ(const std::vector<PointType> &src, const BoundingBox &bbox, std::vector<PointType> &out)
{
out.clear();
const size_t cnt = src.size();
if (cnt < 3) return;
enum class Side { Left = 1, Right = 2, Top = 4, Bottom = 8 };
auto sides = [bbox](const PointType &p) {
return int(p.x() < bbox.min.x()) * int(Side::Left) + int(p.x() > bbox.max.x()) * int(Side::Right) + int(p.y() < bbox.min.y()) * int(Side::Bottom) +
int(p.y() > bbox.max.y()) * int(Side::Top);
};
int sides_prev = sides(src.back());
int sides_this = sides(src.front());
const size_t last = cnt - 1;
for (size_t i = 0; i < last; ++i) {
int sides_next = sides(src[i + 1]);
if ( // This point is inside. Take it.
sides_this == 0 ||
// Either this point is outside and previous or next is inside, or
// the edge possibly cuts corner of the bounding box.
(sides_prev & sides_this & sides_next) == 0) {
out.emplace_back(src[i]);
sides_prev = sides_this;
} else {
// All the three points (this, prev, next) are outside at the same side.
// Ignore this point.
}
sides_this = sides_next;
}
// Never produce just a single point output polygon.
if (!out.empty())
if (int sides_next = sides(out.front());
// The last point is inside. Take it.
sides_this == 0 ||
// Either this point is outside and previous or next is inside, or
// the edge possibly cuts corner of the bounding box.
(sides_prev & sides_this & sides_next) == 0)
out.emplace_back(src.back());
}
void clip_clipper_polygon_with_subject_bbox(const Points &src, const BoundingBox &bbox, Points &out) { clip_clipper_polygon_with_subject_bbox_templ(src, bbox, out); }
void clip_clipper_polygon_with_subject_bbox(const ZPoints &src, const BoundingBox &bbox, ZPoints &out) { clip_clipper_polygon_with_subject_bbox_templ(src, bbox, out); }
template<typename PointType> [[nodiscard]] std::vector<PointType> clip_clipper_polygon_with_subject_bbox_templ(const std::vector<PointType> &src, const BoundingBox &bbox)
{
std::vector<PointType> out;
clip_clipper_polygon_with_subject_bbox(src, bbox, out);
return out;
}
[[nodiscard]] Points clip_clipper_polygon_with_subject_bbox(const Points &src, const BoundingBox &bbox) { return clip_clipper_polygon_with_subject_bbox_templ(src, bbox); }
[[nodiscard]] ZPoints clip_clipper_polygon_with_subject_bbox(const ZPoints &src, const BoundingBox &bbox) { return clip_clipper_polygon_with_subject_bbox_templ(src, bbox); }
void clip_clipper_polygon_with_subject_bbox(const Polygon &src, const BoundingBox &bbox, Polygon &out) {
clip_clipper_polygon_with_subject_bbox(src.points, bbox, out.points);
}
[[nodiscard]] Polygon clip_clipper_polygon_with_subject_bbox(const Polygon &src, const BoundingBox &bbox)
{
Polygon out;
clip_clipper_polygon_with_subject_bbox(src.points, bbox, out.points);
return out;
}
[[nodiscard]] Polygons clip_clipper_polygons_with_subject_bbox(const Polygons &src, const BoundingBox &bbox)
{
Polygons out;
out.reserve(src.size());
for (const Polygon &p : src) out.emplace_back(clip_clipper_polygon_with_subject_bbox(p, bbox));
out.erase(std::remove_if(out.begin(), out.end(), [](const Polygon &polygon) { return polygon.empty(); }), out.end());
return out;
}
[[nodiscard]] Polygons clip_clipper_polygons_with_subject_bbox(const ExPolygon &src, const BoundingBox &bbox)
{
Polygons out;
out.reserve(src.num_contours());
out.emplace_back(clip_clipper_polygon_with_subject_bbox(src.contour, bbox));
for (const Polygon &p : src.holes) out.emplace_back(clip_clipper_polygon_with_subject_bbox(p, bbox));
out.erase(std::remove_if(out.begin(), out.end(), [](const Polygon &polygon) { return polygon.empty(); }), out.end());
return out;
}
}
static ExPolygons PolyTreeToExPolygons(ClipperLib::PolyTree &&polytree)

20
src/libslic3r/ClipperUtils.hpp
View file

@ -296,7 +296,25 @@ namespace ClipperUtils {
const SurfacesPtr &m_surfaces;
size_t m_size;
};
}
// For ClipperLib with Z coordinates.
using ZPoint = Vec3i32;
using ZPoints = std::vector<Vec3i32>;
// Clip source polygon to be used as a clipping polygon with a bouding box around the source (to be clipped) polygon.
// Useful as an optimization for expensive ClipperLib operations, for example when clipping source polygons one by one
// with a set of polygons covering the whole layer below.
void clip_clipper_polygon_with_subject_bbox(const Points &src, const BoundingBox &bbox, Points &out);
void clip_clipper_polygon_with_subject_bbox(const ZPoints &src, const BoundingBox &bbox, ZPoints &out);
[[nodiscard]] Points clip_clipper_polygon_with_subject_bbox(const Points &src, const BoundingBox &bbox);
[[nodiscard]] ZPoints clip_clipper_polygon_with_subject_bbox(const ZPoints &src, const BoundingBox &bbox);
void clip_clipper_polygon_with_subject_bbox(const Polygon &src, const BoundingBox &bbox, Polygon &out);
[[nodiscard]] Polygon clip_clipper_polygon_with_subject_bbox(const Polygon &src, const BoundingBox &bbox);
[[nodiscard]] Polygons clip_clipper_polygons_with_subject_bbox(const Polygons &src, const BoundingBox &bbox);
[[nodiscard]] Polygons clip_clipper_polygons_with_subject_bbox(const ExPolygon &src, const BoundingBox &bbox);
}
// Perform union of input polygons using the non-zero rule, convert to ExPolygons.
ExPolygons ClipperPaths_to_Slic3rExPolygons(const ClipperLib::Paths &input, bool do_union = false);

21
src/libslic3r/PerimeterGenerator.cpp
View file

@ -268,6 +268,10 @@ static ExtrusionEntityCollection traverse_loops(const PerimeterGenerator &perime
}
if (perimeter_generator.config->detect_overhang_wall && perimeter_generator.layer_id > perimeter_generator.object_config->raft_layers) {
// get non 100% overhang paths by intersecting this loop with the grown lower slices
// prepare grown lower layer slices for overhang detection
BoundingBox bbox(polygon.points);
bbox.offset(SCALED_EPSILON);
Polylines remain_polines;
//BBS: don't calculate overhang degree when enable fuzzy skin. It's unmeaning
@ -275,10 +279,10 @@ static ExtrusionEntityCollection traverse_loops(const PerimeterGenerator &perime
for (auto it = lower_polygons_series->begin();
it != lower_polygons_series->end(); it++)
{
Polygons lower_polygons_series_clipped = ClipperUtils::clip_clipper_polygons_with_subject_bbox(it->second, bbox);
Polylines inside_polines = (it == lower_polygons_series->begin()) ?
intersection_pl({ polygon }, it->second) :
intersection_pl(remain_polines, it->second);
Polylines inside_polines = (it == lower_polygons_series->begin()) ? intersection_pl({polygon}, lower_polygons_series_clipped) :
intersection_pl(remain_polines, lower_polygons_series_clipped);
extrusion_paths_append(
paths,
std::move(inside_polines),
@ -289,9 +293,8 @@ static ExtrusionEntityCollection traverse_loops(const PerimeterGenerator &perime
extrusion_width,
(float)perimeter_generator.layer_height);
remain_polines = (it == lower_polygons_series->begin()) ?
diff_pl({ polygon }, it->second) :
diff_pl(remain_polines, it->second);
remain_polines = (it == lower_polygons_series->begin()) ? diff_pl({polygon}, lower_polygons_series_clipped) :
diff_pl(remain_polines, lower_polygons_series_clipped);
if (remain_polines.size() == 0)
break;
@ -299,7 +302,9 @@ static ExtrusionEntityCollection traverse_loops(const PerimeterGenerator &perime
} else {
auto it = lower_polygons_series->end();
it--;
Polylines inside_polines = intersection_pl({ polygon }, it->second);
Polygons lower_polygons_series_clipped = ClipperUtils::clip_clipper_polygons_with_subject_bbox(it->second, bbox);
Polylines inside_polines = intersection_pl({polygon}, lower_polygons_series_clipped);
extrusion_paths_append(
paths,
std::move(inside_polines),
@ -310,7 +315,7 @@ static ExtrusionEntityCollection traverse_loops(const PerimeterGenerator &perime
extrusion_width,
(float)perimeter_generator.layer_height);
remain_polines = diff_pl({ polygon }, it->second);
remain_polines = diff_pl({polygon}, lower_polygons_series_clipped);
}
// get 100% overhang paths by checking what parts of this loop fall