From 494f4f94bfc0e2211ddf2dd22f0c7473c38de4c5 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sun, 20 May 2012 17:28:53 +0200
Subject: [PATCH] After recent memory optimizations, no solid layers were made
 when using fill density == 0

---
 lib/Slic3r/Fill.pm  | 2 +-
 lib/Slic3r/Layer.pm | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Slic3r/Fill.pm b/lib/Slic3r/Fill.pm
index d3b49730f8..0bb20e0074 100644
--- a/lib/Slic3r/Fill.pm
+++ b/lib/Slic3r/Fill.pm
@@ -139,7 +139,7 @@ sub make_fill {
         my $density         = $Slic3r::fill_density;
         my $flow_spacing    = $Slic3r::flow_spacing;
         my $is_bridge       = $layer->id > 0 && $surface->surface_type == S_TYPE_BOTTOM;
-        my $is_solid        = grep { $surface->surface_type == $_ } S_TYPE_TOP, S_TYPE_BOTTOM, S_TYPE_INTERNALSOLID;
+        my $is_solid        = (grep { $surface->surface_type == $_ } S_TYPE_TOP, S_TYPE_BOTTOM, S_TYPE_INTERNALSOLID) ? 1 : 0;
         
         # force 100% density and rectilinear fill for external surfaces
         if ($surface->surface_type != S_TYPE_INTERNAL) {
diff --git a/lib/Slic3r/Layer.pm b/lib/Slic3r/Layer.pm
index a37d224830..ec837b165c 100644
--- a/lib/Slic3r/Layer.pm
+++ b/lib/Slic3r/Layer.pm
@@ -347,7 +347,7 @@ sub prepare_fill_surfaces {
     
     # remove internal surfaces
     if ($Slic3r::fill_density == 0) {
-        @surfaces = grep $_->surface_type == S_TYPE_INTERNAL, @surfaces;
+        @surfaces = grep $_->surface_type != S_TYPE_INTERNAL, @surfaces;
     }
     
     $self->fill_surfaces([@surfaces]);