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New algorithm for overhang detection

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This commit is contained in:
Alessandro Ranellucci 2013-06-20 20:11:46 +02:00
parent 015580629b
commit 7e875393f5
3 changed files with 65 additions and 42 deletions
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30
lib/Slic3r/GCode.pm
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@ -5,11 +5,13 @@ use List::Util qw(min max first);
use Slic3r::ExtrusionPath ':roles';
use Slic3r::Geometry qw(scale unscale scaled_epsilon points_coincide PI X Y B);
use Slic3r::Geometry::Clipper qw(union_ex);
use Slic3r::Surface ':types';
has 'config' => (is => 'ro', required => 1);
has 'multiple_extruders' => (is => 'ro', default => sub {0} );
has 'layer_count' => (is => 'ro', required => 1 );
has 'layer' => (is => 'rw');
has '_layer_overhangs' => (is => 'rw');
has 'move_z_callback' => (is => 'rw');
has 'shift_x' => (is => 'rw', default => sub {0} );
has 'shift_y' => (is => 'rw', default => sub {0} );
@ -82,6 +84,11 @@ sub change_layer {
my ($layer) = @_;
$self->layer($layer);
$self->_layer_overhangs(
$layer->id > 0
? [ map $_->expolygon, grep $_->surface_type == S_TYPE_BOTTOM, map @{$_->slices}, @{$layer->regions} ]
: []
);
if ($self->config->avoid_crossing_perimeters) {
$self->layer_mp(Slic3r::GCode::MotionPlanner->new(
islands => union_ex([ map @$_, @{$layer->slices} ], undef, 1),
@ -152,8 +159,29 @@ sub extrude_loop {
$extrusion_path->clip_end(scale $extrusion_path->flow_spacing * &Slic3r::LOOP_CLIPPING_LENGTH_OVER_SPACING);
return '' if !@{$extrusion_path->polyline};
my @paths = ();
# detect overhanging/bridging perimeters
if ($extrusion_path->is_perimeter && @{$self->_layer_overhangs}) {
# get non-overhang paths by subtracting overhangs from the loop
push @paths,
$extrusion_path->subtract_expolygons($self->_layer_overhangs);
# get overhang paths by intersecting overhangs with the loop
push @paths,
map { $_->role(EXTR_ROLE_OVERHANG_PERIMETER); $_ }
$extrusion_path->intersect_expolygons($self->_layer_overhangs);
# reapply the nearest point search for starting point
# (TODO: choose the nearest point not on an overhang)
@paths = Slic3r::ExtrusionPath::Collection
->new(paths => [@paths])
->chained_path($last_pos);
} else {
push @paths, $extrusion_path;
}
# extrude along the path
my $gcode = $self->extrude_path($extrusion_path, $description);
my $gcode = join '', map $self->extrude_path($_, $description), @paths;
$self->wipe_path($extrusion_path->polyline);
# make a little move inwards before leaving loop