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Better pruning of thin walls to avoid unwanted extra extrusions. Includes regression test. #1794

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This commit is contained in:
Alessandro Ranellucci 2014-03-02 00:28:10 +01:00
parent c1a5cddcd2
commit 8c4a0f23df
4 changed files with 74 additions and 4 deletions
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19
lib/Slic3r/Layer/Region.pm
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@ -175,14 +175,14 @@ sub make_perimeters {
# the minimum thickness of a single loop is:
# width/2 + spacing/2 + spacing/2 + width/2
@offsets = @{offset2(\@last, -(0.5*$pwidth + 0.5*$pspacing - 1), +(0.5*$pspacing - 1))};
# look for thin walls
if ($self->config->thin_walls) {
my $diff = diff_ex(
\@last,
offset(\@offsets, +0.5*$pwidth),
);
push @thin_walls, grep abs($_->area) >= $gap_area_threshold, @$diff;
push @thin_walls, @$diff;
}
} else {
@offsets = @{offset2(\@last, -(1.5*$pspacing - 1), +(0.5*$pspacing - 1))};
@ -305,14 +305,29 @@ sub make_perimeters {
$self->perimeters->append(@loops);
# process thin walls by collapsing slices to single passes
my $min_thin_wall_width = $pwidth/3;
my $min_thin_wall_length = 2*$pwidth;
@thin_walls = @{offset2_ex([ map @$_, @thin_walls ], -0.5*$min_thin_wall_width, +0.5*$min_thin_wall_width)};
if (@thin_walls) {
if (0) {
require "Slic3r/SVG.pm";
Slic3r::SVG::output(
"thin_walls.svg",
no_arrows => 1,
expolygons => \@thin_walls,
red_polylines => [ map $_->polygon->split_at_first_point, @{$self->perimeters} ],
);
}
my @p = map $_->medial_axis($pspacing), @thin_walls;
my @paths = ();
for my $p (@p) {
next if $p->length < $min_thin_wall_length;
my %params = (
role => EXTR_ROLE_EXTERNAL_PERIMETER,
flow_spacing => $self->perimeter_flow->spacing,
);
printf "len = %s\n", unscale($p->length);
push @paths, $p->isa('Slic3r::Polygon')
? Slic3r::ExtrusionLoop->new(polygon => $p, %params)
: Slic3r::ExtrusionPath->new(polyline => $p, %params);

4
lib/Slic3r/SVG.pm
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@ -50,7 +50,7 @@ sub output {
my $g = $svg->group(
style => {
'stroke-width' => 2,
'stroke-width' => 0,
'stroke' => $colour || 'black',
'fill' => ($type !~ /polygons/ ? 'none' : ($colour || 'grey')),
'fill-type' => $filltype,
@ -68,7 +68,7 @@ sub output {
my $g = $svg->group(
style => {
'stroke-width' => 2,
'stroke-width' => ($method eq 'polyline') ? 1 : 0,
'stroke' => $colour || 'black',
'fill' => ($type !~ /polygons/ ? 'none' : ($colour || 'grey')),
},

7
lib/Slic3r/Test.pm
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File diff suppressed because one or more lines are too long

48
t/thin.t Normal file
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@ -0,0 +1,48 @@
use Test::More tests => 1;
use strict;
use warnings;
BEGIN {
use FindBin;
use lib "$FindBin::Bin/../lib";
}
use Slic3r;
use List::Util qw(first);
use Slic3r::Geometry qw(epsilon);
use Slic3r::Test;
{
my $config = Slic3r::Config->new_from_defaults;
$config->set('layer_height', 0.2);
$config->set('first_layer_height', '100%');
$config->set('extrusion_width', 0.5);
$config->set('first_layer_extrusion_width', '200%'); # check this one too
$config->set('skirts', 0);
$config->set('thin_walls', 1);
my $print = Slic3r::Test::init_print('gt2_teeth', config => $config);
my %extrusion_paths = (); # Z => count of continuous extrusions
my $extruding = 0;
Slic3r::GCode::Reader->new->parse(Slic3r::Test::gcode($print), sub {
my ($self, $cmd, $args, $info) = @_;
if ($cmd eq 'G1') {
if ($info->{extruding} && $info->{dist_XY}) {
if (!$extruding) {
$extrusion_paths{$self->Z} //= 0;
$extrusion_paths{$self->Z}++;
}
$extruding = 1;
} else {
$extruding = 0;
}
}
});
ok !(first { $_ != 3 } values %extrusion_paths),
'no superfluous thin walls are generated for toothed profile';
}
__END__