Optimization: split meshes automatically when avoid_crossing_perimeters is enabled, so that we reduce the complexity of the MotionPlanner graphs. This commit includes a very large refactoring of the Model class which is now responsible for duplication and arrangement

lib/Slic3r/Fill/Base.pm

@@ -36,6 +36,7 @@ sub infill_direction {
     return [\@rotate, \@shift];
 }
 
+# this method accepts any object that implements rotate() and translate()
 sub rotate_points {
     my $self = shift;
     my ($expolygon, $rotate_vector) = @_;