diff --git a/src/items/Inventories.hpp b/src/items/Inventories.hpp
index aed3e090..1af4ec8a 100644
--- a/src/items/Inventories.hpp
+++ b/src/items/Inventories.hpp
@@ -15,7 +15,7 @@ using inventories_map = std::unordered_map<int64_t, std::shared_ptr<Inventory>>;
 class Inventories {
     Level& level;
     inventories_map map;
-    PseudoRandom random;
+    util::PseudoRandom random;
 public:
     Inventories(Level& level);
     ~Inventories();
diff --git a/src/maths/util.hpp b/src/maths/util.hpp
index 5e671082..432fe0bb 100644
--- a/src/maths/util.hpp
+++ b/src/maths/util.hpp
@@ -4,49 +4,63 @@
 
 #include <ctime>
 
-class PseudoRandom {
-    unsigned short seed;
-public:
-    PseudoRandom() {
-        seed = (unsigned short)time(0);
-    }
+namespace util {
+    class PseudoRandom {
+        unsigned short seed;
+    public:
+        PseudoRandom() {
+            seed = static_cast<unsigned short>(time(0));
+        }
 
-    int rand() {
-        seed = (seed + 0x7ed5 + (seed << 6));
-        seed = (seed ^ 0xc23c ^ (seed >> 9));
-        seed = (seed + 0x1656 + (seed << 3));
-        seed = ((seed + 0xa264) ^ (seed << 4));
-        seed = (seed + 0xfd70 - (seed << 3));
-        seed = (seed ^ 0xba49 ^ (seed >> 8));
+        int rand() {
+            seed = (seed + 0x7ed5 + (seed << 6));
+            seed = (seed ^ 0xc23c ^ (seed >> 9));
+            seed = (seed + 0x1656 + (seed << 3));
+            seed = ((seed + 0xa264) ^ (seed << 4));
+            seed = (seed + 0xfd70 - (seed << 3));
+            seed = (seed ^ 0xba49 ^ (seed >> 8));
 
-        return (int)seed;
-    }
+            return static_cast<int>(seed);
+        }
 
-    int32_t rand32() {
-        return (rand() << 16) | rand();
-    }
+        int32_t rand32() {
+            return (rand() << 16) | rand();
+        }
 
-    uint32_t randU32() {
-        return (rand() << 16) | rand();
-    }
+        uint32_t randU32() {
+            return (rand() << 16) | rand();
+        }
 
-    int64_t rand64() {
-        uint64_t x = randU32();
-        uint64_t y = randU32();
-        return (x << 32ULL) | y;
-    }
+        int64_t rand64() {
+            uint64_t x = randU32();
+            uint64_t y = randU32();
+            return (x << 32ULL) | y;
+        }
 
-    void setSeed(int number) {
-        seed =
-            ((unsigned short)(number * 23729) ^ (unsigned short)(number + 16786)
-            );
-        rand();
-    }
-    void setSeed(int number1, int number2) {
-        seed =
-            (((unsigned short)(number1 * 23729) |
-              (unsigned short)(number2 % 16786)) ^
-             (unsigned short)(number2 * number1));
-        rand();
-    }
-};
+        uint64_t randU64() {
+            uint64_t x = randU32();
+            uint64_t y = randU32();
+            return (x << 32ULL) | y;
+        }
+
+        float randFloat() {
+            return randU32() / static_cast<float>(UINT32_MAX);
+        }
+
+        double randDouble() {
+            return randU64() / static_cast<double>(UINT64_MAX);
+        }
+
+        void setSeed(int number) {
+            seed = (static_cast<unsigned short>(number * 23729) ^ 
+                    static_cast<unsigned short>(number + 16786));
+            rand();
+        }
+        void setSeed(int number1, int number2) {
+            seed = ((static_cast<unsigned short>(number1 * 23729) |
+                    static_cast<unsigned short>(number2 % 16786)) ^
+                    static_cast<unsigned short>(number2 * number1));
+            rand();
+        }
+    };
+}
diff --git a/src/world/generator/WorldGenerator.cpp b/src/world/generator/WorldGenerator.cpp
index 11602236..27c6753c 100644
--- a/src/world/generator/WorldGenerator.cpp
+++ b/src/world/generator/WorldGenerator.cpp
@@ -173,7 +173,6 @@ void WorldGenerator::generateStructures(
     }
     const auto& biomes = prototype.biomes;
     const auto& heightmap = prototype.heightmap;
-    const auto& heights = heightmap->getValues();
 
     util::concat(prototype.structures, def.script->placeStructures(
         {chunkX * CHUNK_W, chunkZ * CHUNK_D}, {CHUNK_W, CHUNK_D}, seed,
@@ -189,13 +188,13 @@ void WorldGenerator::generateStructures(
             offset, placement.structure, placement.rotation, chunkX, chunkZ);
     }
 
-    PseudoRandom structsRand;
+    util::PseudoRandom structsRand;
     structsRand.setSeed(chunkX, chunkZ);
 
+    auto heights = heightmap->getValues();
     for (uint z = 0; z < CHUNK_D; z++) {
         for (uint x = 0; x < CHUNK_W; x++) {
-            float rand = (structsRand.randU32() % RAND_MAX) / 
-                static_cast<float>(RAND_MAX);
+            float rand = structsRand.randFloat();
             const Biome* biome = biomes[z * CHUNK_W + x];
             size_t structureId = biome->structures.choose(rand, -1);
             if (structureId == -1) {
@@ -273,7 +272,7 @@ void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ) {
 
     std::memset(voxels, 0, sizeof(voxel) * CHUNK_VOL);
 
-    PseudoRandom plantsRand;
+    util::PseudoRandom plantsRand;
     plantsRand.setSeed(chunkX, chunkZ);
 
     const auto& biomes = prototype.biomes.get();
@@ -291,8 +290,7 @@ void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ) {
             generate_pole(groundLayers, height, 0, seaLevel, voxels, x, z);
             
             if (height+1 > seaLevel) {
-                float rand = (plantsRand.randU32() % RAND_MAX) / 
-                              static_cast<float>(RAND_MAX);
+                float rand = plantsRand.randFloat();
                 blockid_t plant = biome->plants.choose(rand);
                 if (plant) {
                     voxels[vox_index(x, height+1, z)].id = plant;
@@ -306,7 +304,8 @@ void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ) {
             logger.error() << "invalid structure index " << placement.structure;
             continue;
         }
-        auto& structure = *def.structures[placement.structure]->fragments[placement.rotation];
+        auto& generatingStructure = def.structures[placement.structure];
+        auto& structure = *generatingStructure->fragments[placement.rotation];
         auto& structVoxels = structure.getRuntimeVoxels();
         const auto& offset = placement.position;
         const auto& size = structure.getSize();