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Fix of disabling thick bridges adds unnecessary support interfaces #7260

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Improved numerical robustness when removing bridging perimeters from
overhangs to be supported.
This commit is contained in:
Vojtech Bubnik 2021-12-10 18:26:54 +01:00
parent 080e80a4d6
commit 121bb260db
1 changed files with 5 additions and 2 deletions
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7
src/libslic3r/SupportMaterial.cpp
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@ -1340,7 +1340,10 @@ namespace SupportMaterialInternal {
// so we take the largest value and also apply safety offset to be ensure no gaps // so we take the largest value and also apply safety offset to be ensure no gaps
// are left in between // are left in between
Flow perimeter_bridge_flow = layerm.bridging_flow(frPerimeter); Flow perimeter_bridge_flow = layerm.bridging_flow(frPerimeter);
float w = float(std::max(perimeter_bridge_flow.scaled_width(), perimeter_bridge_flow.scaled_spacing())); //FIXME one may want to use a maximum of bridging flow width and normal flow width, as the perimeters are calculated using the normal flow
// and then turned to bridging flow, thus their centerlines are derived from non-bridging flow and expanding them by a bridging flow
// may not expand them to the edge of their respective islands.
const float w = float(0.5 * std::max(perimeter_bridge_flow.scaled_width(), perimeter_bridge_flow.scaled_spacing())) + scaled<float>(0.001);
for (Polyline &polyline : overhang_perimeters) for (Polyline &polyline : overhang_perimeters)
if (polyline.is_straight()) { if (polyline.is_straight()) {
// This is a bridge // This is a bridge
@ -1355,7 +1358,7 @@ namespace SupportMaterialInternal {
supported[j] = true; supported[j] = true;
if (supported[0] && supported[1]) if (supported[0] && supported[1])
// Offset a polyline into a thick line. // Offset a polyline into a thick line.
polygons_append(bridges, offset(polyline, 0.5f * w + 10.f)); polygons_append(bridges, offset(polyline, w));
} }
bridges = union_(bridges); bridges = union_(bridges);
} }