diff --git a/voxygen/src/mesh/terrain.rs b/voxygen/src/mesh/terrain.rs
index b3d479a672..d3543d7aad 100644
--- a/voxygen/src/mesh/terrain.rs
+++ b/voxygen/src/mesh/terrain.rs
@@ -104,8 +104,8 @@ impl<V: BaseVol<Vox = Block> + ReadVol + Debug, S: VolSize + Clone>
                                 .map(|vox| block_shadow_density(vox.kind()))
                                 .unwrap_or((0.0, 0.0));
 
-                            neighbour_light[0][i][j] =
-                                (neighbour_light[0][i][j] * (1.0 - density)).max(cap);
+                            neighbour_light[0][i][j] = (neighbour_light[0][i][j] * (1.0 - density))
+                                .max(cap.min(neighbour_light[1][i][j]));
                         }
                     }
 
diff --git a/world/src/block/mod.rs b/world/src/block/mod.rs
index 22e9d530e4..c0a2283620 100644
--- a/world/src/block/mod.rs
+++ b/world/src/block/mod.rs
@@ -410,7 +410,7 @@ impl<'a> ZCache<'a> {
     }
 }
 
-impl<'a> SamplerMut for BlockGen<'a> {
+impl<'a> SamplerMut<'static> for BlockGen<'a> {
     type Index = Vec3<i32>;
     type Sample = Option<Block>;
 
diff --git a/world/src/column/mod.rs b/world/src/column/mod.rs
index 3ea1df255e..5240bdb713 100644
--- a/world/src/column/mod.rs
+++ b/world/src/column/mod.rs
@@ -121,7 +121,7 @@ impl<'a> ColumnGen<'a> {
     }
 }
 
-impl<'a> Sampler for ColumnGen<'a> {
+impl<'a> Sampler<'a> for ColumnGen<'a> {
     type Index = Vec2<i32>;
     type Sample = Option<ColumnSample<'a>>;
 
diff --git a/world/src/generator/mod.rs b/world/src/generator/mod.rs
new file mode 100644
index 0000000000..021235916a
--- /dev/null
+++ b/world/src/generator/mod.rs
@@ -0,0 +1,10 @@
+mod town;
+
+// Reexports
+pub use self::town::TownGen;
+
+use crate::util::Sampler;
+use common::terrain::Block;
+use vek::*;
+
+pub trait Generator<'a, T: 'a>: Sampler<'a, Index = (&'a T, Vec3<i32>), Sample = Block> {}
diff --git a/world/src/generator/town.rs b/world/src/generator/town.rs
new file mode 100644
index 0000000000..effe803c4b
--- /dev/null
+++ b/world/src/generator/town.rs
@@ -0,0 +1,19 @@
+use super::Generator;
+use crate::util::Sampler;
+use common::terrain::Block;
+use vek::*;
+
+pub struct TownState;
+
+pub struct TownGen;
+
+impl<'a> Sampler<'a> for TownGen {
+    type Index = (&'a TownState, Vec3<i32>);
+    type Sample = Block;
+
+    fn get(&self, (town, pos): Self::Index) -> Self::Sample {
+        unimplemented!()
+    }
+}
+
+impl<'a> Generator<'a, TownState> for TownGen {}
diff --git a/world/src/lib.rs b/world/src/lib.rs
index 5a58627c9c..69bd984cdd 100644
--- a/world/src/lib.rs
+++ b/world/src/lib.rs
@@ -10,6 +10,7 @@ mod all;
 mod block;
 mod column;
 pub mod config;
+pub mod generator;
 pub mod sim;
 pub mod util;
 
diff --git a/world/src/util/random.rs b/world/src/util/random.rs
index ece87a30ce..7cb106e06c 100644
--- a/world/src/util/random.rs
+++ b/world/src/util/random.rs
@@ -11,7 +11,7 @@ impl RandomField {
     }
 }
 
-impl Sampler for RandomField {
+impl Sampler<'static> for RandomField {
     type Index = Vec3<i32>;
     type Sample = u32;
 
@@ -46,7 +46,7 @@ impl RandomPerm {
     }
 }
 
-impl Sampler for RandomPerm {
+impl Sampler<'static> for RandomPerm {
     type Index = u32;
     type Sample = u32;
 
diff --git a/world/src/util/sampler.rs b/world/src/util/sampler.rs
index 921ffc7f33..14a720949e 100644
--- a/world/src/util/sampler.rs
+++ b/world/src/util/sampler.rs
@@ -1,13 +1,13 @@
-pub trait Sampler: Sized {
-    type Index;
-    type Sample;
+pub trait Sampler<'a>: Sized {
+    type Index: 'a;
+    type Sample: 'a;
 
     fn get(&self, index: Self::Index) -> Self::Sample;
 }
 
-pub trait SamplerMut: Sized {
-    type Index;
-    type Sample;
+pub trait SamplerMut<'a>: Sized {
+    type Index: 'a;
+    type Sample: 'a;
 
     fn get(&mut self, index: Self::Index) -> Self::Sample;
 }
diff --git a/world/src/util/structure.rs b/world/src/util/structure.rs
index 512acd671d..6c2e570c49 100644
--- a/world/src/util/structure.rs
+++ b/world/src/util/structure.rs
@@ -21,7 +21,7 @@ impl StructureGen2d {
     }
 }
 
-impl Sampler for StructureGen2d {
+impl Sampler<'static> for StructureGen2d {
     type Index = Vec2<i32>;
     type Sample = [(Vec2<i32>, u32); 9];
 
diff --git a/world/src/util/unit_chooser.rs b/world/src/util/unit_chooser.rs
index c5c0203090..882126e0da 100644
--- a/world/src/util/unit_chooser.rs
+++ b/world/src/util/unit_chooser.rs
@@ -24,7 +24,7 @@ impl UnitChooser {
     }
 }
 
-impl Sampler for UnitChooser {
+impl Sampler<'static> for UnitChooser {
     type Index = u32;
     type Sample = (Vec2<i32>, Vec2<i32>);