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Extended (and fixed) unit testing to track down (and fix) an issue caused by floating point math that reversed some holes into contours when they should actually be ignored

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This commit is contained in:
Alessandro Ranellucci 2011-12-22 11:24:46 +01:00
parent fbea5dae8f
commit 98a8c64ed7
3 changed files with 113 additions and 25 deletions
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20
lib/Slic3r/Layer.pm
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@ -105,8 +105,28 @@ sub make_surfaces {
my ($loops) = @_;
{
# merge everything
my $expolygons = union_ex($loops);
# sometimes the magic of floating point values produces holes outside of any contour;
# we need to ignore such holes, but Clipper will convert them to contours.
# so we identify them and remove them manually.
# get expolygons without holes (candidate for reverse holes detection)
my @expolygons_without_holes = grep { @$_ == 1 } @$expolygons;
# remove all holes from such expolygons
my $diff = diff_ex(
[ map @$_, @expolygons_without_holes ],
[ map [ reverse @$_ ], grep !is_counter_clockwise($_), @$loops ],
);
# merge resulting holes (true holes) and other expolygons
$expolygons = [
(grep { @$_ > 1 } @$expolygons),
@$diff,
];
Slic3r::debugf " %d surface(s) having %d holes detected from %d polylines\n",
scalar(@$expolygons), scalar(map $_->holes, @$expolygons), scalar(@$loops);