diff --git a/res/generators/default.lua b/res/generators/default.lua
index d12fd70c..41790163 100644
--- a/res/generators/default.lua
+++ b/res/generators/default.lua
@@ -53,6 +53,11 @@ biomes = {
             {block="base:stone", height=-1},
             {block="base:bazalt", height=1},
         },
+        structures = {
+            "tree0",
+            "tree1",
+            "tree2"
+        }
     }
 }
 
@@ -60,7 +65,7 @@ function load_structures()
     local structures = {}
     local names = {"tree0", "tree1", "tree2", "tower"}
     for i, name in ipairs(names) do
-        local filename = "core:default.files/"..name
+        local filename = "core:default/"..name
         debug.log("loading structure "..filename)
         table.insert(structures, generation.load_structure(filename))
     end
diff --git a/res/generators/default/structures.json b/res/generators/default/structures.json
new file mode 100644
index 00000000..109ca95f
--- /dev/null
+++ b/res/generators/default/structures.json
@@ -0,0 +1,6 @@
+{
+    "tree0": {},
+    "tree1": {},
+    "tree2": {},
+    "tower": {}
+}
diff --git a/res/generators/default.files/tower.vox b/res/generators/default/tower.vox
similarity index 100%
rename from res/generators/default.files/tower.vox
rename to res/generators/default/tower.vox
diff --git a/res/generators/default.files/tree0.vox b/res/generators/default/tree0.vox
similarity index 100%
rename from res/generators/default.files/tree0.vox
rename to res/generators/default/tree0.vox
diff --git a/res/generators/default.files/tree1.vox b/res/generators/default/tree1.vox
similarity index 100%
rename from res/generators/default.files/tree1.vox
rename to res/generators/default/tree1.vox
diff --git a/res/generators/default.files/tree2.vox b/res/generators/default/tree2.vox
similarity index 100%
rename from res/generators/default.files/tree2.vox
rename to res/generators/default/tree2.vox
diff --git a/src/content/Content.cpp b/src/content/Content.cpp
index 98affbbf..68e9cec3 100644
--- a/src/content/Content.cpp
+++ b/src/content/Content.cpp
@@ -10,6 +10,7 @@
 #include "objects/EntityDef.hpp"
 #include "objects/rigging.hpp"
 #include "voxels/Block.hpp"
+#include "world/generator/VoxelFragment.hpp"
 #include "world/generator/GeneratorDef.hpp"
 #include "ContentPack.hpp"
 
diff --git a/src/content/ContentBuilder.hpp b/src/content/ContentBuilder.hpp
index a0daa9ac..44099304 100644
--- a/src/content/ContentBuilder.hpp
+++ b/src/content/ContentBuilder.hpp
@@ -8,6 +8,7 @@
 #include "ContentPack.hpp"
 #include "items/ItemDef.hpp"
 #include "objects/EntityDef.hpp"
+#include "world/generator/VoxelFragment.hpp"
 #include "world/generator/GeneratorDef.hpp"
 #include "voxels/Block.hpp"
 
diff --git a/src/content/ContentLoader.cpp b/src/content/ContentLoader.cpp
index ca4be87d..42e83fbf 100644
--- a/src/content/ContentLoader.cpp
+++ b/src/content/ContentLoader.cpp
@@ -433,18 +433,6 @@ void ContentLoader::loadEntity(
     if (fs::exists(configFile)) loadEntity(def, full, configFile);
 }
 
-
-void ContentLoader::loadGenerator(
-    GeneratorDef& def, const std::string& full, const std::string& name
-) {
-    auto folder = pack->folder;
-    auto generatorFile = folder / fs::path("generators/" + name + ".lua");
-    if (!fs::exists(generatorFile)) {
-        return;
-    }
-    def.script = scripting::load_generator(generatorFile);
-}
-
 void ContentLoader::loadBlock(
     Block& def, const std::string& full, const std::string& name
 ) {
@@ -523,6 +511,9 @@ void ContentLoader::load() {
     if (fs::is_directory(generatorsDir)) {
         for (const auto& entry : fs::directory_iterator(generatorsDir)) {
             const auto& file = entry.path();
+            if (fs::is_directory(file)) {
+                continue;
+            }
 
             std::string name = file.stem().u8string();
             auto [packid, full, filename] =
diff --git a/src/content/loading/GeneratorLoader.cpp b/src/content/loading/GeneratorLoader.cpp
new file mode 100644
index 00000000..a0f8ba49
--- /dev/null
+++ b/src/content/loading/GeneratorLoader.cpp
@@ -0,0 +1,74 @@
+#include "../ContentLoader.hpp"
+
+#include "../ContentPack.hpp"
+
+#include "files/files.hpp"
+#include "logic/scripting/scripting.hpp"
+#include "world/generator/GeneratorDef.hpp"
+#include "world/generator/VoxelFragment.hpp"
+#include "debug/Logger.hpp"
+
+static debug::Logger logger("generator-loader");
+
+static VoxelStructureMeta load_structure_meta(
+    const std::string& name, const dv::value& config
+) {
+    VoxelStructureMeta meta;
+    meta.name = name;
+
+    return meta;
+}
+
+static std::vector<std::unique_ptr<GeneratingVoxelStructure>> load_structures(
+    const fs::path& structuresFile
+) {
+    auto structuresDir = structuresFile.parent_path();
+    auto map = files::read_json(structuresFile);
+
+    std::vector<std::unique_ptr<GeneratingVoxelStructure>> structures;
+    for (auto& [name, config] : map.asObject()) {
+        auto structFile = structuresDir / fs::u8path(name + ".vox");
+        logger.debug() << "loading voxel fragment " << structFile.u8string();
+        if (!fs::exists(structFile)) {
+            throw std::runtime_error("structure file does not exist (" +
+                structFile.u8string());
+        }
+        auto fragment = std::make_unique<VoxelFragment>();
+        fragment->deserialize(files::read_binary_json(structFile));
+
+        structures.push_back(std::make_unique<GeneratingVoxelStructure>(
+            load_structure_meta(name, config),
+            std::move(fragment)
+        ));
+    }
+    return structures;
+}
+
+static void load_structures(GeneratorDef& def, const fs::path& structuresFile) {
+    def.structures = load_structures(structuresFile);
+    // build indices map
+    for (size_t i = 0; i < def.structures.size(); i++) {
+        auto& structure = def.structures[i];
+        def.structuresIndices[structure->meta.name] = i;
+    }
+}
+
+static inline const auto STRUCTURES_FILE = fs::u8path("structures.json");
+static inline const auto GENERATORS_DIR = fs::u8path("generators");
+
+void ContentLoader::loadGenerator(
+    GeneratorDef& def, const std::string& full, const std::string& name
+) {
+    auto packDir = pack->folder;
+    auto generatorsDir = packDir / GENERATORS_DIR;
+    auto folder = generatorsDir / fs::u8path(name);
+    auto generatorFile = generatorsDir / fs::u8path(name + ".lua");
+    if (!fs::exists(generatorFile)) {
+        return;
+    }
+    auto structuresFile = folder / STRUCTURES_FILE;
+    if (fs::exists(structuresFile)) {
+        load_structures(def, structuresFile);
+    }
+    def.script = scripting::load_generator(generatorFile);
+}
diff --git a/src/logic/scripting/lua/libgeneration.cpp b/src/logic/scripting/lua/libgeneration.cpp
index b5e90515..2f5e4851 100644
--- a/src/logic/scripting/lua/libgeneration.cpp
+++ b/src/logic/scripting/lua/libgeneration.cpp
@@ -4,7 +4,7 @@
 #include "files/util.hpp"
 #include "coders/binary_json.hpp"
 #include "world/Level.hpp"
-#include "world/generator/VoxelStructure.hpp"
+#include "world/generator/VoxelFragment.hpp"
 #include "engine.hpp"
 #include "lua_custom_types.hpp"
 
@@ -19,7 +19,7 @@ static int l_save_structure(lua::State* L) {
     }
     bool saveEntities = lua::toboolean(L, 4);
     
-    auto structure = VoxelStructure::create(level, pointA, pointB, saveEntities);
+    auto structure = VoxelFragment::create(level, pointA, pointB, saveEntities);
     auto map = structure->serialize();
 
     auto bytes = json::to_binary(map);
@@ -37,7 +37,7 @@ static int l_load_structure(lua::State* L) {
     }
     auto map = files::read_binary_json(path);
 
-    auto structure = std::make_shared<VoxelStructure>();
+    auto structure = std::make_shared<VoxelFragment>();
     structure->deserialize(map);
     return lua::newuserdata<lua::LuaVoxelStructure>(L, std::move(structure));
 }
diff --git a/src/logic/scripting/lua/lua_custom_types.hpp b/src/logic/scripting/lua/lua_custom_types.hpp
index 79ea4492..dcd78800 100644
--- a/src/logic/scripting/lua/lua_custom_types.hpp
+++ b/src/logic/scripting/lua/lua_custom_types.hpp
@@ -7,7 +7,7 @@
 
 struct fnl_state;
 class Heightmap;
-class VoxelStructure;
+class VoxelFragment;
 
 namespace lua {
     class Userdata {
@@ -72,13 +72,13 @@ namespace lua {
     static_assert(!std::is_abstract<LuaHeightmap>());
 
     class LuaVoxelStructure : public Userdata {
-        std::shared_ptr<VoxelStructure> structure;
+        std::shared_ptr<VoxelFragment> structure;
     public:
-        LuaVoxelStructure(std::shared_ptr<VoxelStructure> structure);
+        LuaVoxelStructure(std::shared_ptr<VoxelFragment> structure);
 
         virtual ~LuaVoxelStructure();
 
-        std::shared_ptr<VoxelStructure> getStructure() const {
+        std::shared_ptr<VoxelFragment> getStructure() const {
             return structure;
         }
 
diff --git a/src/logic/scripting/lua/usertypes/lua_type_voxelstructure.cpp b/src/logic/scripting/lua/usertypes/lua_type_voxelstructure.cpp
index b35ed517..08a3ef84 100644
--- a/src/logic/scripting/lua/usertypes/lua_type_voxelstructure.cpp
+++ b/src/logic/scripting/lua/usertypes/lua_type_voxelstructure.cpp
@@ -2,12 +2,12 @@
 
 #include "../lua_util.hpp"
 
-#include "world/generator/VoxelStructure.hpp"
+#include "world/generator/VoxelFragment.hpp"
 #include "util/stringutil.hpp"
 
 using namespace lua;
 
-LuaVoxelStructure::LuaVoxelStructure(std::shared_ptr<VoxelStructure> structure)
+LuaVoxelStructure::LuaVoxelStructure(std::shared_ptr<VoxelFragment> structure)
     : structure(std::move(structure)) {}
 
 LuaVoxelStructure::~LuaVoxelStructure() {
diff --git a/src/logic/scripting/scripting_world_generation.cpp b/src/logic/scripting/scripting_world_generation.cpp
index 12b4d1d5..59712dff 100644
--- a/src/logic/scripting/scripting_world_generation.cpp
+++ b/src/logic/scripting/scripting_world_generation.cpp
@@ -32,8 +32,8 @@ public:
       seaLevel(seaLevel) 
       {}
 
-    std::vector<std::shared_ptr<VoxelStructure>> loadStructures() override {
-        std::vector<std::shared_ptr<VoxelStructure>> structures;
+    std::vector<std::shared_ptr<VoxelFragment>> loadStructures() override {
+        std::vector<std::shared_ptr<VoxelFragment>> structures;
 
         auto L = lua::get_main_thread();
         lua::pushenv(L, *env);
diff --git a/src/world/generator/GeneratorDef.cpp b/src/world/generator/GeneratorDef.cpp
new file mode 100644
index 00000000..32abee49
--- /dev/null
+++ b/src/world/generator/GeneratorDef.cpp
@@ -0,0 +1,11 @@
+#include "GeneratorDef.hpp"
+
+#include "VoxelFragment.hpp"
+
+GeneratingVoxelStructure::GeneratingVoxelStructure(
+    VoxelStructureMeta meta,
+    std::unique_ptr<VoxelFragment> structure
+) : structure(std::move(structure)), meta(std::move(meta)) {}
+
+
+GeneratorDef::GeneratorDef(std::string name) : name(std::move(name)) {}
diff --git a/src/world/generator/GeneratorDef.hpp b/src/world/generator/GeneratorDef.hpp
index 8f3c3aea..33432b09 100644
--- a/src/world/generator/GeneratorDef.hpp
+++ b/src/world/generator/GeneratorDef.hpp
@@ -1,14 +1,20 @@
 #pragma once
 
 #include <string>
+#include <vector>
 #include <glm/glm.hpp>
+#include <unordered_map>
 
 #include "typedefs.hpp"
 #include "maths/Heightmap.hpp"
 #include "StructurePlacement.hpp"
 
 class Content;
-class VoxelStructure;
+class VoxelFragment;
+
+struct VoxelStructureMeta {
+    std::string name;
+};
 
 struct BlocksLayer {
     /// @brief Layer block
@@ -102,7 +108,7 @@ public:
     virtual ~GeneratorScript() = default;
 
     /// @brief Load all structures
-    virtual std::vector<std::shared_ptr<VoxelStructure>> loadStructures() = 0;
+    virtual std::vector<std::shared_ptr<VoxelFragment>> loadStructures() = 0;
 
     /// @brief Generates a heightmap with values in range 0..1
     /// @param offset position of the heightmap in the world
@@ -133,12 +139,25 @@ public:
     virtual void prepare(const Content* content) = 0;
 };
 
+struct GeneratingVoxelStructure {
+    VoxelStructureMeta meta;
+    std::unique_ptr<VoxelFragment> structure;
+
+    GeneratingVoxelStructure(
+        VoxelStructureMeta meta,
+        std::unique_ptr<VoxelFragment> structure
+    );
+};
+
 /// @brief Generator information
 struct GeneratorDef {
     /// @brief Generator full name - packid:name
     std::string name;
     std::unique_ptr<GeneratorScript> script;
 
-    GeneratorDef(std::string name) : name(std::move(name)) {}
+    std::unordered_map<std::string, size_t> structuresIndices;
+    std::vector<std::unique_ptr<GeneratingVoxelStructure>> structures;
+
+    GeneratorDef(std::string name);
     GeneratorDef(const GeneratorDef&) = delete;
 };
diff --git a/src/world/generator/VoxelStructure.cpp b/src/world/generator/VoxelFragment.cpp
similarity index 89%
rename from src/world/generator/VoxelStructure.cpp
rename to src/world/generator/VoxelFragment.cpp
index 5c36176b..2dd49fb7 100644
--- a/src/world/generator/VoxelStructure.cpp
+++ b/src/world/generator/VoxelFragment.cpp
@@ -1,4 +1,4 @@
-#include "VoxelStructure.hpp"
+#include "VoxelFragment.hpp"
 
 #include <unordered_map>
 #include <cstring>
@@ -10,7 +10,7 @@
 #include "voxels/VoxelsVolume.hpp"
 #include "world/Level.hpp"
 
-std::unique_ptr<VoxelStructure> VoxelStructure::create(
+std::unique_ptr<VoxelFragment> VoxelFragment::create(
     Level* level, const glm::ivec3& a, const glm::ivec3& b, bool entities
 ) {
     auto start = glm::min(a, b);
@@ -43,11 +43,11 @@ std::unique_ptr<VoxelStructure> VoxelStructure::create(
         voxels[i].state = volVoxels[i].state;
     }
 
-    return std::make_unique<VoxelStructure>(
+    return std::make_unique<VoxelFragment>(
         size, std::move(voxels), std::move(blockNames));
 }
 
-dv::value VoxelStructure::serialize() const {
+dv::value VoxelFragment::serialize() const {
     auto root = dv::object();
     root["version"] = STRUCTURE_FORMAT_VERSION;
     root["size"] = dv::to_value(size);
@@ -64,7 +64,7 @@ dv::value VoxelStructure::serialize() const {
     return root;
 }
 
-void VoxelStructure::deserialize(const dv::value& src) {
+void VoxelFragment::deserialize(const dv::value& src) {
     size = glm::ivec3();
     dv::get_vec(src, "size", size);
 
@@ -83,7 +83,7 @@ void VoxelStructure::deserialize(const dv::value& src) {
     }
 }
 
-void VoxelStructure::prepare(const Content& content) {
+void VoxelFragment::prepare(const Content& content) {
     auto volume = size.x*size.y*size.z;
     voxelsRuntime.resize(volume);
     for (size_t i = 0; i < volume; i++) {
@@ -93,7 +93,7 @@ void VoxelStructure::prepare(const Content& content) {
     }
 }
 
-std::unique_ptr<VoxelStructure> VoxelStructure::rotated(const Content& content) const {
+std::unique_ptr<VoxelFragment> VoxelFragment::rotated(const Content& content) const {
     std::vector<voxel> newVoxels(voxels.size());
 
     for (int y = 0; y < size.y; y++) {
@@ -115,7 +115,7 @@ std::unique_ptr<VoxelStructure> VoxelStructure::rotated(const Content& content)
             }
         }
     }
-    auto newStructure = std::make_unique<VoxelStructure>(
+    auto newStructure = std::make_unique<VoxelFragment>(
         // swap X and Z on 90 deg. rotation
         glm::ivec3(size.z, size.y, size.x),
         std::move(newVoxels),
diff --git a/src/world/generator/VoxelStructure.hpp b/src/world/generator/VoxelFragment.hpp
similarity index 85%
rename from src/world/generator/VoxelStructure.hpp
rename to src/world/generator/VoxelFragment.hpp
index ef70c229..0a75359e 100644
--- a/src/world/generator/VoxelStructure.hpp
+++ b/src/world/generator/VoxelFragment.hpp
@@ -11,7 +11,7 @@ inline constexpr int STRUCTURE_FORMAT_VERSION = 1;
 class Level;
 class Content;
 
-class VoxelStructure : public Serializable {
+class VoxelFragment : public Serializable {
     glm::ivec3 size;
 
     /// @brief Structure voxels indexed different to world content
@@ -22,9 +22,9 @@ class VoxelStructure : public Serializable {
     /// @brief Structure voxels built on prepare(...) call
     std::vector<voxel> voxelsRuntime;
 public:
-    VoxelStructure() : size() {}
+    VoxelFragment() : size() {}
 
-    VoxelStructure(
+    VoxelFragment(
         glm::ivec3 size,
         std::vector<voxel> voxels,
         std::vector<std::string> blockNames
@@ -41,9 +41,9 @@ public:
     void prepare(const Content& content);
 
     /// @brief Create structure copy rotated 90 deg. clockwise
-    std::unique_ptr<VoxelStructure> rotated(const Content& content) const;
+    std::unique_ptr<VoxelFragment> rotated(const Content& content) const;
 
-    static std::unique_ptr<VoxelStructure> create(
+    static std::unique_ptr<VoxelFragment> create(
         Level* level, const glm::ivec3& a, const glm::ivec3& b, bool entities);
 
     const glm::ivec3& getSize() const {
diff --git a/src/world/generator/WorldGenerator.cpp b/src/world/generator/WorldGenerator.cpp
index 933f2901..90778870 100644
--- a/src/world/generator/WorldGenerator.cpp
+++ b/src/world/generator/WorldGenerator.cpp
@@ -7,7 +7,7 @@
 #include "voxels/Block.hpp"
 #include "voxels/Chunk.hpp"
 #include "GeneratorDef.hpp"
-#include "VoxelStructure.hpp"
+#include "VoxelFragment.hpp"
 #include "util/timeutil.hpp"
 #include "util/listutil.hpp"
 #include "debug/Logger.hpp"
@@ -259,6 +259,8 @@ void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ) {
             }
         }
     }
+    
+    // TODO: put automatic placement here
 
     for (const auto& placement : prototype.structures) {
         if (placement.structure < 0 || placement.structure >= structures.size()) {
diff --git a/src/world/generator/WorldGenerator.hpp b/src/world/generator/WorldGenerator.hpp
index 8783bc15..29de778b 100644
--- a/src/world/generator/WorldGenerator.hpp
+++ b/src/world/generator/WorldGenerator.hpp
@@ -16,7 +16,7 @@ class Content;
 struct GeneratorDef;
 class Heightmap;
 struct Biome;
-class VoxelStructure;
+class VoxelFragment;
 
 enum class ChunkPrototypeLevel {
     VOID=0, BIOMES, HEIGHTMAP, STRUCTURES
@@ -47,7 +47,7 @@ class WorldGenerator {
     /// @brief Chunk prototypes loading surround map
     SurroundMap surroundMap;
 
-    std::vector<std::array<std::shared_ptr<VoxelStructure>, 4>> structures;
+    std::vector<std::array<std::shared_ptr<VoxelFragment>, 4>> structures;
 
     /// @brief Generate chunk prototype (see ChunkPrototype)
     /// @param x chunk position X divided by CHUNK_W