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Avoid starting loops on convex vertices and/or overhangs. #296 #135

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This commit is contained in:
Alessandro Ranellucci 2013-06-21 19:43:15 +02:00
parent 90d8da0e0d
commit aba7641fe4
2 changed files with 29 additions and 3 deletions
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22
lib/Slic3r/GCode.pm
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@ -141,6 +141,25 @@ sub extrude_loop {
$loop = $loop->unpack if $loop->isa('Slic3r::ExtrusionLoop::Packed');
my $was_clockwise = $loop->polygon->make_counter_clockwise;
# find candidate starting points
# start looking for concave vertices not being overhangs
my @concave = $loop->polygon->concave_points;
my @candidates = grep Boost::Geometry::Utils::point_covered_by_multi_polygon($_, $self->_layer_overhangs),
@concave;
if (!@candidates) {
# if none, look for any concave vertex
@candidates = @concave;
if (!@candidates) {
# if none, look for any non-overhang vertex
@candidates = grep Boost::Geometry::Utils::point_covered_by_multi_polygon($_, $self->_layer_overhangs),
@{$loop->polygon};
if (!@candidates) {
# if none, all points are valid candidates
@candidates = @{$loop->polygon};
}
}
}
# find the point of the loop that is closest to the current extruder position
# or randomize if requested
my $last_pos = $self->last_pos;
@ -148,10 +167,9 @@ sub extrude_loop {
$last_pos = Slic3r::Point->new(scale $self->config->print_center->[X], scale $self->config->bed_size->[Y]);
$last_pos->rotate(rand(2*PI), $self->config->print_center);
}
my $start_index = $loop->nearest_point_index_to($last_pos);
# split the loop at the starting point and make a path
my $extrusion_path = $loop->split_at_index($start_index);
my $extrusion_path = $loop->split_at(Slic3r::Geometry::nearest_point($last_pos, \@candidates));
# clip the path to avoid the extruder to get exactly on the first point of the loop;
# if polyline was shorter than the clipping distance we'd get a null polyline, so

10
lib/Slic3r/Polygon.pm
View file

@ -7,7 +7,7 @@ use parent 'Slic3r::Polyline';
use Slic3r::Geometry qw(polygon_lines polygon_remove_parallel_continuous_edges
polygon_remove_acute_vertices polygon_segment_having_point point_in_polygon
X1 X2 Y1 Y2);
PI X1 X2 Y1 Y2);
use Slic3r::Geometry::Clipper qw(JT_MITER);
sub lines {
@ -154,4 +154,12 @@ sub split_at_first_point {
return $self->split_at_index(0);
}
sub concave_points {
my $self = shift;
return map $self->[$_],
grep Slic3r::Geometry::angle3points(@$self[$_, $_-1, $_+1]) < PI,
-1 .. ($#$self-1);
}
1;