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fix: When removing too thin bridge, use it as solid instead of sparse.

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supermerill/SuperSlicer#1766
supermerill/SuperSlicer#1781
This commit is contained in:
supermerill 2021-11-02 00:26:05 +01:00
parent 703e26bc6d
commit 1822af7854
1 changed files with 125 additions and 89 deletions
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48
src/libslic3r/LayerRegion.cpp
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@ -241,22 +241,57 @@ void LayerRegion::process_external_surfaces(const Layer *lower_layer, const Poly
break; break;
} }
// Grown by bridged_infill_margin. // Grown by bridged_infill_margin.
// also, remove all bridge area that are thinner than a single line. Polygons polys;
Polygons polys = offset2(to_polygons(bridges[i].expolygon),
(-this->flow(frInfill).scaled_width() / 2),
(this->flow(frInfill).scaled_width() / 2) + float(margin_bridged),
EXTERNAL_SURFACES_OFFSET_PARAMETERS);
if (idx_island == -1) { if (idx_island == -1) {
BOOST_LOG_TRIVIAL(trace) << "Bridge did not fall into the source region!"; BOOST_LOG_TRIVIAL(trace) << "Bridge did not fall into the source region!";
} else { } else {
// also, remove all bridge area that are thinner than a single line.
ExPolygons expoly_collapsed = offset2_ex(bridges[i].expolygon,
(-this->flow(frInfill).scaled_width() / 2),
(this->flow(frInfill).scaled_width() / 2) + SCALED_EPSILON,
EXTERNAL_SURFACES_OFFSET_PARAMETERS);
//check if there is something cut
ExPolygons cut = diff_ex({ bridges[i].expolygon }, expoly_collapsed, true);
double area_cut = 0; for (ExPolygon& c : cut) area_cut += c.area();
if (area_cut > (this->flow(frInfill).scaled_width() * this->flow(frInfill).scaled_width())) {
//if area not negligible, we will consider it.
// compute the bridge area, if any.
ExPolygons ex_polys = offset_ex(expoly_collapsed, float(margin_bridged), EXTERNAL_SURFACES_OFFSET_PARAMETERS);
polys = to_polygons(ex_polys);
//add the cut section as solid infill
Surface srf_bottom = bridges[i];
srf_bottom.surface_type = stPosBottom | stDensSolid;
// clip it to the infill area and remove the bridge part.
surfaces_append(
bottom,
diff_ex(
intersection_ex(
ExPolygons{ fill_boundaries_ex[idx_island] },
offset_ex(cut, double(margin), EXTERNAL_SURFACES_OFFSET_PARAMETERS)
),
ex_polys),
srf_bottom);
} else {
//negligible, don't offset2
polys = offset(to_polygons(bridges[i].expolygon), float(margin_bridged), EXTERNAL_SURFACES_OFFSET_PARAMETERS);
}
// Found an island, to which this bridge region belongs. Trim it, // Found an island, to which this bridge region belongs. Trim it,
polys = intersection(polys, to_polygons(fill_boundaries_ex[idx_island])); polys = intersection(polys, to_polygons(fill_boundaries_ex[idx_island]));
} }
//keep bridges & bridge_bboxes & bridges_grown the SAME SIZE
if (!polys.empty()) {
bridge_bboxes.push_back(get_extents(polys)); bridge_bboxes.push_back(get_extents(polys));
bridges_grown.push_back(std::move(polys)); bridges_grown.push_back(std::move(polys));
} else {
bridges.erase(bridges.begin() + i);
--i;
} }
} }
}
if (bridges.empty())
{
fill_boundaries = union_(fill_boundaries, true);
} else {
// 2) Group the bridge surfaces by overlaps. // 2) Group the bridge surfaces by overlaps.
std::vector<size_t> bridge_group(bridges.size(), (size_t)-1); std::vector<size_t> bridge_group(bridges.size(), (size_t)-1);
size_t n_groups = 0; size_t n_groups = 0;
@ -348,6 +383,7 @@ void LayerRegion::process_external_surfaces(const Layer *lower_layer, const Poly
} }
#endif #endif
} }
}
Surfaces new_surfaces; Surfaces new_surfaces;
{ {