ENH: filter small gap

thanks SoftFever

Signed-off-by: qing.zhang <qing.zhang@bambulab.com>
Change-Id: I9bffe629419455b2a7b4494aa595b711619939da

src/libslic3r/Fill/Fill.cpp

@@ -479,6 +479,7 @@ void Layer::make_fills(FillAdaptive::Octree* adaptive_fill_octree, FillAdaptive:
 		if (surface_fill.params.pattern == ipGrid)
 			params.can_reverse = false;
 		LayerRegion* layerm = this->m_regions[surface_fill.region_id];
+		params.filter_out_gap_fill = layerm->region().config().filter_out_gap_fill.value;
 		for (ExPolygon& expoly : surface_fill.expolygons) {
             f->no_overlap_expolygons = intersection_ex(surface_fill.no_overlap_expolygons, ExPolygons() = {expoly}, ApplySafetyOffset::Yes);
 			// Spacing is modified by the filler to indicate adjustments. Reset it for each expolygon.

src/libslic3r/Fill/FillBase.hpp

@@ -40,7 +40,7 @@ struct FillParams
     bool        full_infill() const { return density > 0.9999f; }
     // Don't connect the fill lines around the inner perimeter.
     bool        dont_connect() const { return anchor_length_max < 0.05f; }
-
+    double      filter_out_gap_fill { 0.0 };
     // Fill density, fraction in <0, 1>
     float       density 		{ 0.f };
 

src/libslic3r/Fill/FillRectilinear.cpp

@@ -3174,6 +3174,11 @@ void FillMonotonicLineWGapFill::fill_surface_extrusion(const Surface* surface, c
 
         if (!polylines.empty() && !is_bridge(params.extrusion_role)) {
             ExtrusionEntityCollection gap_fill;
+            // SoftFever: filter out tiny gap fills
+            polylines.erase(std::remove_if(polylines.begin(), polylines.end(), [&](const ThickPolyline &p) {
+                return p.length() < scale_(params.filter_out_gap_fill);
+            }), polylines.end());
+
             variable_width(polylines, erGapFill, params.flow, gap_fill.entities);
             coll_nosort->append(std::move(gap_fill.entities));
         }