Bugfix: fill density = 0 was preventing generation of extra solid layers. #75

lib/Slic3r/Layer.pm

@@ -349,6 +349,9 @@ sub remove_small_perimeters {
 sub process_bridges {
     my $self = shift;
     
+    # no bridges are possible if we have no internal surfaces
+    return if $Slic3r::fill_density == 0;
+    
     my @bridges = ();
     
     # a bottom surface on a layer > 0 is either a bridge or a overhang 

lib/Slic3r/Print.pm

@@ -171,13 +171,6 @@ sub detect_surfaces_type {
         Slic3r::debugf "  layer %d has %d bottom, %d top and %d internal surfaces\n",
             $layer->id, scalar(@bottom), scalar(@top), scalar(@internal);
     }
-    
-    # remove internal surfaces if no infill is requested
-    if ($Slic3r::fill_density == 0) {
-        foreach my $layer (@{$self->layers}) {
-            @{$layer->surfaces} = grep $_->surface_type ne 'internal', @{$layer->surfaces};
-        }
-    }
 }
 
 sub discover_horizontal_shells {
@@ -283,7 +276,7 @@ sub extrude_skirt {
 # combine fill surfaces across layers
 sub infill_every_layers {
     my $self = shift;
-    return unless $Slic3r::infill_every_layers > 1;
+    return unless $Slic3r::infill_every_layers > 1 && $Slic3r::fill_density > 0;
     
     printf "==> COMBINING INFILL\n";
     

lib/Slic3r/Skein.pm

@@ -37,7 +37,6 @@ sub go {
     
     # this will clip $layer->surfaces to the infill boundaries 
     # and split them in top/bottom/internal surfaces;
-    # if fill density is null, it will delete all internal surfaces
     $self->status_cb->(30, "Detecting solid surfaces...");
     $print->detect_surfaces_type;