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Update on "add perimeter on overhangs": use the new, time-intensive, "detect bridge" function

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supermerill 2018-07-10 20:20:03 +02:00
parent 18f926cfc4
commit 4f6e19b3c2
1 changed files with 33 additions and 7 deletions
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40
xs/src/libslic3r/PerimeterGenerator.cpp
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@ -156,15 +156,41 @@ void PerimeterGenerator::process()
if (this->config->extra_perimeters && i > loop_number && !last.empty()
&& this->lower_slices != NULL && !this->lower_slices->expolygons.empty()){
//split the polygons with bottom/notbottom
ExPolygons support(this->lower_slices->expolygons);
ExPolygons unsupported = diff_ex(last, support, true);
ExPolygons unsupported = diff_ex(last, this->lower_slices->expolygons, true);
if (!unsupported.empty()) {
//only consider overhangs and let bridges alone
// it's more reliable than the BridgeDetector
ExPolygonCollection coll_last(support);
ExPolygon hull;
hull.contour = coll_last.convex_hull();
unsupported = diff_ex(unsupported, ExPolygons() = { hull });
if (true) {
//only consider the part that can be bridged (really, by the bridge algorithm)
//first, separate into islands (ie, each ExPlolygon)
int numploy = 0;
//only consider the bottom layer that intersect unsupported, to be sure it's only on our island.
ExPolygonCollection lower_island(diff_ex(last, unsupported, true));
BridgeDetector detector(unsupported,
lower_island,
perimeter_spacing);
if (detector.detect_angle(Geometry::deg2rad(this->config->bridge_angle.value))) {
ExPolygons bridgeable = union_ex(detector.coverage(-1, true));
if (!bridgeable.empty()) {
//simplify to avoid most of artefacts from printing lines.
ExPolygons bridgeable_simplified;
for (ExPolygon &poly : bridgeable) {
poly.simplify(perimeter_spacing / 2, &bridgeable_simplified);
}
if (!bridgeable_simplified.empty())
bridgeable_simplified = offset_ex(bridgeable_simplified, perimeter_spacing/1.9);
if (!bridgeable_simplified.empty()) {
//offset by perimeter spacing because the simplify may have reduced it a bit.
unsupported = diff_ex(unsupported, bridgeable_simplified, true);
}
}
}
} else {
ExPolygonCollection coll_last(intersection_ex(last, offset_ex(this->lower_slices->expolygons, -perimeter_spacing / 2)));
ExPolygon hull;
hull.contour = coll_last.convex_hull();
unsupported = diff_ex(offset_ex(unsupported, perimeter_spacing), ExPolygons() = { hull });
}
if (!unsupported.empty()) {
//add fake perimeters here
may_add_more_perimeters = true;