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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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68
lib/Slic3r/ExtrusionPath.pm
View file

@ -60,6 +60,17 @@ sub pack {
# no-op, this allows to use both packed and non-packed objects in Collections
sub unpack { $_[0] }
sub clone {
my $self = shift;
my %p = @_;
$p{polyline} ||= $self->polyline->clone;
return (ref $self)->new(
(map { $_ => $self->$_ } qw(polyline height flow_spacing role)),
%p,
);
}
sub clip_with_polygon {
my $self = shift;
my ($polygon) = @_;
@ -71,16 +82,24 @@ sub clip_with_expolygon {
my $self = shift;
my ($expolygon) = @_;
my @paths = ();
foreach my $polyline ($self->polyline->clip_with_expolygon($expolygon)) {
push @paths, (ref $self)->new(
polyline => $polyline,
height => $self->height,
flow_spacing => $self->flow_spacing,
role => $self->role,
);
}
return @paths;
return map $self->clone(polyline => $_),
$self->polyline->clip_with_expolygon($expolygon);
}
sub intersect_expolygons {
my $self = shift;
my ($expolygons) = @_;
return map $self->clone(polyline => Slic3r::Polyline->new(@$_)),
@{Boost::Geometry::Utils::multi_polygon_multi_linestring_intersection($expolygons, [$self->polyline])};
}
sub subtract_expolygons {
my $self = shift;
my ($expolygons) = @_;
return map $self->clone(polyline => Slic3r::Polyline->new(@$_)),
@{Boost::Geometry::Utils::multi_linestring_multi_polygon_difference([$self->polyline], $expolygons)};
}
sub simplify {
@ -141,22 +160,15 @@ sub split_at_acute_angles {
# if the angle between $p[-2], $p[-1], $p3 is too acute
# then consider $p3 only as a starting point of a new
# path and stop the current one as it is
push @paths, (ref $self)->new(
polyline => Slic3r::Polyline->new(\@p),
role => $self->role,
height => $self->height,
);
push @paths, $self->clone(polyline => Slic3r::Polyline->new(\@p));
@p = ($p3);
push @p, grep $_, shift @points or last;
} else {
push @p, $p3;
}
}
push @paths, (ref $self)->new(
polyline => Slic3r::Polyline->new(\@p),
role => $self->role,
height => $self->height,
) if @p > 1;
push @paths, $self->clone(polyline => Slic3r::Polyline->new(\@p))
if @p > 1;
return @paths;
}
@ -251,12 +263,8 @@ sub detect_arcs {
);
# points 0..$i form a linear path
push @paths, (ref $self)->new(
polyline => Slic3r::Polyline->new(@points[0..$i]),
role => $self->role,
flow_spacing => $self->flow_spacing,
height => $self->height,
) if $i > 0;
push @paths, $self->clone(polyline => Slic3r::Polyline->new(@points[0..$i]))
if $i > 0;
# add our arc
push @paths, $arc;
@ -271,12 +279,8 @@ sub detect_arcs {
}
# remaining points form a linear path
push @paths, (ref $self)->new(
polyline => Slic3r::Polyline->new(\@points),
role => $self->role,
flow_spacing => $self->flow_spacing,
height => $self->height,
) if @points > 1;
push @paths, $self->clone(polyline => Slic3r::Polyline->new(\@points))
if @points > 1;
return @paths;
}

30
lib/Slic3r/GCode.pm
View file

@ -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

9
lib/Slic3r/Layer/Region.pm
View file

@ -267,15 +267,6 @@ sub make_perimeters {
$role = EXTR_ROLE_CONTOUR_INTERNAL_PERIMETER;
}
if ($self->id > 0) {
# A perimeter is considered overhang if its centerline exceeds the lower layer slices
my $is_overhang = $is_contour
? @{diff([$polygon], \@lower_slices)}
: !@{intersection([$polygon], \@lower_slices)};
$role = EXTR_ROLE_OVERHANG_PERIMETER if $is_overhang;
}
push @loops, Slic3r::ExtrusionLoop->pack(
polygon => $polygon,
role => $role,