refactor: increase BLEND_RADIUS to 12

include/Cubed/config.hpp

@@ -1,4 +1,5 @@
 #pragma once
+#include <array>
 
 namespace Cubed {
 
@@ -13,7 +14,7 @@ constexpr int MAX_CHARACTER = 128;
 constexpr float NORMAL_FOV = 70.0f;
 
 constexpr int MAX_BIOME_SUM = 4;
-
+using HeightMapArray = std::array<std::array<float, CHUCK_SIZE>, CHUCK_SIZE>;
 constexpr float VERTICES_POS[6][6][3] = {
         // ===== front (z = +1) =====
         0.0f, 0.0f, 1.0f,  // bottom left

include/Cubed/gameplay/biome.hpp

@@ -1,6 +1,7 @@
 #pragma once
 #include <array>
 #include <string>
+#include <vector>
 
 namespace Cubed {
 
@@ -15,7 +16,8 @@ enum class Biome {
     PLAIN = 0,
     FOREST,
     DESERT,
-    MOUNTAIN
+    MOUNTAIN,
+    NONE
 };
 
 struct BiomeHeightRange {
@@ -23,11 +25,16 @@ struct BiomeHeightRange {
     int amplitude;
 };
 
+struct BiomeNonAdjacent {
+    Biome first;
+    std::vector<Biome> second;
+    Biome replace;
+};
+
 std::string get_biome_str(Biome biome);
 Biome get_biome_from_noise(float temp, float humid);
 std::array<float, 3> get_noise_frequencies_for_biome(Biome biome);
 BiomeHeightRange get_biome_height_range(Biome biome);
 Biome safe_int_to_biome(int x);
 int get_interpolated_height(float world_x, float world_z, float temp, float humid);
-
 }

include/Cubed/gameplay/chunk.hpp

@@ -15,18 +15,28 @@ class World;
 // if want to use, do init_chunk(), gen_vertex_data() and 
 class Chunk {
 private:
+    static constexpr int SIZE_X = CHUCK_SIZE;
+    static constexpr int SIZE_Y = WORLD_SIZE_Y;
+    static constexpr int SIZE_Z = CHUCK_SIZE;
+    
+    static inline const std::vector<BiomeNonAdjacent> NON_ADJACENT {{
+        {Biome::PLAIN, {Biome::NONE}, Biome::PLAIN},
+        {Biome::FOREST, {Biome::DESERT}, Biome::PLAIN},
+        {Biome::DESERT, {Biome::MOUNTAIN, Biome::FOREST}, Biome::PLAIN},
+        {Biome::MOUNTAIN, {Biome::DESERT}, Biome::PLAIN}
+    }
+    };
+    using HeightMapArray = std::array<std::array<float, SIZE_Z>, SIZE_X>;
     std::atomic<bool> m_dirty {false};
     std::atomic<bool> m_need_upload{true};
     std::atomic<bool> m_is_on_gen_vertex_data {false};
     std::atomic<size_t> m_vertex_sum = 0;
     std::mutex m_vertexs_data_mutex;
-    static constexpr int SIZE_X = CHUCK_SIZE;
-    static constexpr int SIZE_Y = WORLD_SIZE_Y;
-    static constexpr int SIZE_Z = CHUCK_SIZE;
     
-    Biome m_biome = Biome::PLAIN;
+    std::atomic<Biome> m_biome = Biome::PLAIN;
     ChunkPos m_chunk_pos;
     World& m_world;
+    HeightMapArray m_heightmap;
     // the index is a array of block id
     std::vector<uint8_t> m_blocks;
     GLuint m_vbo = 0;
@@ -51,10 +61,22 @@ public:
     Biome get_biome() const;
 
     const std::vector<uint8_t>& get_chunk_blocks() const;    
-    
+    HeightMapArray get_heightmap() const;
     static int get_index(int x, int y, int z);
     static int get_index(const glm::vec3& pos);
     void init_chunk();
+    // Generate Biome
+    void gen_phase_one();
+    // Adjust Biome
+    void gen_phase_two(const std::array<const Chunk*, 4>& adj_chunks);
+    // Generate Heightmap
+    void gen_phase_three();
+    // Adjust Height
+    void gen_phase_four(const std::array<std::optional<HeightMapArray>, 4>& neighbor_heightmap);
+    // Generate Block
+    void gen_phase_five();
+    // Generate Structure
+    void gen_phase_six();
     //void gen_vertex_data();
     // 0 : (1, 0)
     // 1 : (-1, 0) 

include/Cubed/gameplay/world.hpp

@@ -27,6 +27,9 @@ private:
     using ChunkUpdateList = std::vector<std::pair<ChunkPos, Chunk>>;
     using ConstChunkMap = std::unordered_map<ChunkPos, const Chunk*, ChunkPos::Hash>;
     using ChunkPosSet = std::unordered_set<ChunkPos, ChunkPos::Hash>;  
+    
+    bool m_could_gen = true;
+
     glm::vec3 m_gen_player_pos{0.0f, 0.0f, 0.0f};
     std::unordered_map<ChunkPos , Chunk, ChunkPos::Hash> m_chunks;
     std::unordered_map<std::size_t, Player> m_players;
@@ -48,6 +51,8 @@ private:
     std::vector<std::pair<ChunkPos, Chunk>> m_new_chunk;
     std::vector<std::pair<ChunkPos, Chunk>> m_new_chunk_queue;
 
+    void init_chunks();
+
     void gen_chunks_internal();
     void sync_player_pos(glm::vec3& player_pos);
     void compute_required_chunks(ChunkPosSet& required_chunks);

src/gameplay/biome.cpp

@@ -24,10 +24,13 @@ std::string get_biome_str(Biome biome) {
         case MOUNTAIN:
             str = "Mountain";
             break;
+        case NONE: 
+            str = "Unknown";
+            break;
     }
     return str;
 };
-
+/*
 Biome get_biome_from_noise(float temp, float humid) {
     auto weight = [](float t, float h, float ct, float ch) -> float {
             float dt = t - ct;
@@ -45,7 +48,14 @@ Biome get_biome_from_noise(float temp, float humid) {
     if (w_d >= w_m && w_d >= w_p && w_d >= w_f) return Biome::DESERT;
     return Biome::FOREST;
 }
-
+*/
+Biome get_biome_from_noise(float temp, float humid) {
+    using enum Biome;
+    if (temp < 0.5f && humid < 0.5f) return PLAIN; 
+    if (temp < 0.5f && humid >= 0.5f) return FOREST;
+    if (temp >= 0.5f && humid < 0.5f) return DESERT;
+    return MOUNTAIN;         
+}
 std::array<float, 3> get_noise_frequencies_for_biome(Biome biome) {
     using enum Biome;
     switch (biome) {
@@ -57,6 +67,9 @@ std::array<float, 3> get_noise_frequencies_for_biome(Biome biome) {
             return {0.003f, 0.010f, 0.020f};
         case MOUNTAIN:
             return {0.006f, 0.015f, 0.030f};
+        case NONE:
+            ASSERT_MSG(false, "Chunk Biome is None");
+            throw std::invalid_argument{"Chunk Biome is None"};
     }
     Logger::warn("Unknown Biome");
     return {0.003f, 0.015f, 0.06f};
@@ -73,6 +86,9 @@ BiomeHeightRange get_biome_height_range(Biome biome) {
             return {61, 12};
         case MOUNTAIN:
             return {70, 70};
+        case NONE:
+            ASSERT_MSG(false, "Chunk Biome is None");
+            throw std::invalid_argument{"Chunk Biome is None"};
     }
     Logger::warn("Unknown Biome");
     return {62, 4};

src/gameplay/chunk.cpp

@@ -31,9 +31,10 @@ Chunk::Chunk(Chunk&& other) noexcept :
     m_need_upload(other.m_need_upload.load()),
     m_is_on_gen_vertex_data(other.m_is_on_gen_vertex_data.load()),
     m_vertex_sum(other.m_vertex_sum.load()),
-    m_biome(other.m_biome),
+    m_biome(other.m_biome.load()),
     m_chunk_pos(std::move(other.m_chunk_pos)),
     m_world(other.m_world),
+    m_heightmap(std::move(other.m_heightmap)),
     m_blocks(std::move(other.m_blocks)),
     m_vbo(other.m_vbo),
     m_vertexs_data(std::move(other.m_vertexs_data))
@@ -42,13 +43,15 @@ Chunk::Chunk(Chunk&& other) noexcept :
 }
 
 Chunk& Chunk::operator=(Chunk&& other) noexcept {
+    //Logger::info("other Chunk pos {} {} in Chunk& Chunk::operator=(Chunk&& other) this {}", other.m_chunk_pos.x, other.m_chunk_pos.z, static_cast<const void*>(&other));
     m_vbo = other.m_vbo;
     other.m_vbo = 0;
     m_chunk_pos = std::move(other.m_chunk_pos);
+    m_heightmap = std::move(other.m_heightmap);
     m_blocks = std::move(other.m_blocks);
     m_dirty = other.is_dirty();
     m_vertexs_data = std::move(other.m_vertexs_data);
-    m_biome = other.m_biome;
+    m_biome = other.m_biome.load();
     m_is_on_gen_vertex_data = other.m_is_on_gen_vertex_data.load();
     m_need_upload = other.m_need_upload.load();
     m_vertex_sum = other.m_vertex_sum.load();
@@ -56,13 +59,18 @@ Chunk& Chunk::operator=(Chunk&& other) noexcept {
 }
 
 Biome Chunk::get_biome() const {
-    return m_biome;
+    return m_biome.load();
 }
 
 const std::vector<uint8_t>& Chunk::get_chunk_blocks() const{
     return m_blocks;
 }
 
+HeightMapArray Chunk::get_heightmap() const {
+    //Logger::info("Chunk pos {} {} in get_heightmap this {}", m_chunk_pos.x, m_chunk_pos.z, static_cast<const void*>(this));
+    return m_heightmap;
+}
+
 int Chunk::get_index(int x, int y, int z) {
     ASSERT(!(x < 0 || y < 0 || z < 0 || x >= CHUCK_SIZE || y >= WORLD_SIZE_Y || z >= CHUCK_SIZE));
     if ((x * WORLD_SIZE_Y + y) * CHUCK_SIZE + z < 0 || (x * WORLD_SIZE_Y + y) * CHUCK_SIZE + z >= CHUCK_SIZE * CHUCK_SIZE * WORLD_SIZE_Y) {
@@ -209,6 +217,187 @@ void Chunk::init_chunk() {
     resolve_blocks();
 }
 
+void Chunk::gen_phase_one() {
+    resolve_biome();
+}
+
+void Chunk::gen_phase_two(const std::array<const Chunk*, 4>& adj_chunks) {
+    for (auto& chunk : adj_chunks) {
+        if (chunk == nullptr) {
+            continue;
+        }
+        Biome biome = chunk->get_biome();
+        for (const auto& non : NON_ADJACENT) {
+            if (m_biome != non.first) {
+                continue;
+            }
+            for (auto b : non.second) {
+                if (b == biome) {
+                    m_biome = non.replace;
+                    return;
+                }
+            }
+        }
+    }
+}
+
+void Chunk::gen_phase_three() {
+    for (int x = 0; x < CHUCK_SIZE; x++) {
+        for (int z = 0; z < CHUCK_SIZE; z++) {
+             
+            float world_x = static_cast<float>(x + m_chunk_pos.x * CHUCK_SIZE);
+            float world_z = static_cast<float>(z + m_chunk_pos.z * CHUCK_SIZE);
+
+            auto sample_height = [&](Biome b) -> float {
+                auto range = get_biome_height_range(b);
+                auto [f1, f2, f3] = get_noise_frequencies_for_biome(b);
+                float n =
+                    1.00f * PerlinNoise::noise(world_x * f1, 0.5f, world_z * f1) +
+                    0.50f * PerlinNoise::noise(world_x * f2, 0.5f, world_z * f2) +
+                    0.25f * PerlinNoise::noise(world_x * f3, 0.5f, world_z * f3);
+                n /= 1.75f;
+                return range.base_y + n * range.amplitude;
+            };
+            m_heightmap[x][z] = sample_height(m_biome); 
+        }
+    }
+}
+
+void Chunk::gen_phase_four(const std::array<std::optional<HeightMapArray>, 4>& neighbor_heightmap) {
+    // Width of interpolation influence (in number of cells)
+    constexpr int BLEND_RADIUS = 12;
+
+    for (int x = 0; x < SIZE_X; x++) {
+        for (int z = 0; z < SIZE_Z; z++) {
+            float h = static_cast<float>(m_heightmap[x][z]);
+            float total_weight = 1.0f;
+            float blended = h;
+
+            // --- Right neighbor neighbor[0]: (1, 0) ---
+            // Blend when x is close to SIZE_X-1
+            if (neighbor_heightmap[0] != std::nullopt) {
+                int dist = (SIZE_X - 1) - x; // distance from right border
+                if (dist < BLEND_RADIUS) {
+                    // Neighbor's boundary row is its x=0 column
+                    float neighbor_h = static_cast<float>((*neighbor_heightmap[0])[0][z]);
+                    float t = 1.0f - static_cast<float>(dist) / BLEND_RADIUS; // larger weight when closer
+                    // Use smoothstep for a more natural transition
+                    t = t * t * (3.0f - 2.0f * t);
+                    blended += t * neighbor_h;
+                    total_weight += t;
+                }
+            }
+
+            // --- Left neighbor neighbor[1]: (-1, 0) ---
+            if (neighbor_heightmap[1] != std::nullopt) {
+                int dist = x; // distance from left border
+                if (dist < BLEND_RADIUS) {
+                    float neighbor_h = static_cast<float>((*neighbor_heightmap[1])[SIZE_X - 1][z]);
+                    float t = 1.0f - static_cast<float>(dist) / BLEND_RADIUS;
+                    t = t * t * (3.0f - 2.0f * t);
+                    blended += t * neighbor_h;
+                    total_weight += t;
+                }
+            }
+
+            // --- Front neighbor neighbor[2]: (0, 1) ---
+            if (neighbor_heightmap[2] != std::nullopt) {
+                int dist = (SIZE_Z - 1) - z;
+                if (dist < BLEND_RADIUS) {
+                    float neighbor_h = static_cast<float>((*neighbor_heightmap[2])[x][0]);
+                    float t = 1.0f - static_cast<float>(dist) / BLEND_RADIUS;
+                    t = t * t * (3.0f - 2.0f * t);
+                    blended += t * neighbor_h;
+                    total_weight += t;
+                }
+            }
+
+            // --- Back neighbor neighbor[3]: (0, -1) ---
+            if (neighbor_heightmap[3] != std::nullopt) {
+                int dist = z;
+                if (dist < BLEND_RADIUS) {
+                    float neighbor_h = static_cast<float>((*neighbor_heightmap[3])[x][SIZE_Z - 1]);
+                    float t = 1.0f - static_cast<float>(dist) / BLEND_RADIUS;
+                    t = t * t * (3.0f - 2.0f * t);
+                    blended += t * neighbor_h;
+                    total_weight += t;
+                }
+            }
+
+            m_heightmap[x][z] = static_cast<int>(blended / total_weight);
+        }
+    }
+}
+
+void Chunk::gen_phase_five() {
+    // bottom
+    m_blocks.assign(CHUCK_SIZE * CHUCK_SIZE * WORLD_SIZE_Y, 0);
+    for (int x = 0; x < CHUCK_SIZE; x++) {
+        for (int y = 0; y < 5; y++) {
+            for (int z = 0; z < CHUCK_SIZE; z++) {
+                m_blocks[get_index(x, y, z)] = 3;
+            }
+        }
+    }
+
+    for (int x = 0; x < CHUCK_SIZE; x++) {
+        for (int z = 0; z < CHUCK_SIZE; z++) {
+            int height = static_cast<int>(m_heightmap[x][z]);
+            for (int y = 5; y < height - 5; y++) {
+                m_blocks[get_index(x, y, z)] = 3;
+            }
+            if (m_biome == Biome::MOUNTAIN) {
+                for (int y = height - 5; y <= height - 1; y++) {
+                    if (y > 110) {
+                        m_blocks[get_index(x, y, z)] = 3;
+                    } else {
+                        m_blocks[get_index(x, y, z)] = 2;
+                    }
+                    
+                }
+                if (height > 110) {
+                    m_blocks[get_index(x, height - 1, z)] = 3;
+                } else {
+                    m_blocks[get_index(x, height - 1, z)] = 1;
+                }
+            } else if (m_biome == Biome::DESERT) {
+                for (int y = height - 5; y <= height; y++) {
+                    m_blocks[get_index(x, y, z)] = 4;
+                }
+            } else {
+                for (int y = height - 5; y <= height - 1; y++) {
+                    m_blocks[get_index(x, y, z)] = 2;
+                }
+                for (int y = height; y <= height; y++) {
+                    m_blocks[get_index(x, y, z)] = 1;
+                }
+            }
+        }
+    }
+
+}
+
+void Chunk::gen_phase_six() {
+    if (m_biome == Biome::FOREST) {
+        std::array<int, SIZE_X> x_arr;
+        std::iota(x_arr.begin(), x_arr.end(), 0);
+        std::shuffle(x_arr.begin(), x_arr.end(), Cubed::Random::get().engine());
+        std::array<int, SIZE_Z> z_arr;
+        std::iota(z_arr.begin(), z_arr.end(), 0);
+        std::shuffle(z_arr.begin(), z_arr.end(), Cubed::Random::get().engine());
+        for (auto x : x_arr) {
+            for (auto z : z_arr) {
+                if (Cubed::Random::get().random_bool(0.1)) {
+                    build_tree(*this, {x, static_cast<int>(m_heightmap[x][z]), z});
+                }
+                
+            }
+        }
+    }
+
+    mark_dirty();
+}
+
 void Chunk::upload_to_gpu() {
 
     ASSERT(is_need_upload());

src/gameplay/world.cpp

@@ -11,7 +11,6 @@
 
 namespace Cubed {
 
-
 static constexpr ChunkPos CHUNK_DIR[] {
         {1, 0}, {-1, 0}, {0, 1}, {0, -1}
     };
@@ -75,6 +74,7 @@ Player& World::get_player(const std::string& name){
 }
 
 void World::init_world() {
+    m_chunks.reserve(DISTANCE * DISTANCE);
     auto t1 = std::chrono::system_clock::now();
     for (int s = 0; s < DISTANCE; s++) {
         for (int t = 0; t < DISTANCE; t++) {
@@ -86,28 +86,21 @@ void World::init_world() {
             m_chunks.emplace(pos, Chunk(*this, pos)); 
         }
     }
-    /*
-    for (auto& chunk_map : m_chunks) {
-        auto& [chunk_pos, chunk] = chunk_map;
-        chunk.init_chunk();
 
-    }
+    Logger::info("Max Support Thread is {}", std::thread::hardware_concurrency());
-    // After block gen fininshed
+    init_chunks();
+    auto t2 = std::chrono::system_clock::now();
+    auto d = std::chrono::duration_cast<std::chrono::milliseconds>(t2 - t1);
+    Logger::info("Chunk Block Init Finish, Time Consuming: {}", d);
+    // init players
+    m_players.emplace(HASH::str("TestPlayer"), Player(*this, "TestPlayer"));
+    Logger::info("TestPlayer Create Finish");
 
-    std::array<const std::vector<uint8_t>*, 4> neighbor_block;
+    start_gen_thread();
 
-    for (auto& [pos, chunk] : m_chunks) {
+}
-        for (int i = 0; i < 4; i++) {
+/*
-            auto it = m_chunks.find(pos + CHUNK_DIR[i]);
+void World::init_chunks() {
-            if (it != m_chunks.end()) {
-                neighbor_block[i] = &(it->second.get_chunk_blocks());
-            } else {
-                neighbor_block[i] = nullptr;
-            }
-        }
-        chunk.gen_vertex_data(neighbor_block);
-    }
-    */
     std::vector<Chunk*> chunk_ptrs;
     chunk_ptrs.reserve(m_chunks.size());
     for (auto& [pos, chunk] : m_chunks) {
@@ -148,14 +141,81 @@ void World::init_world() {
         chunk.upload_to_gpu();
         
     }
-    auto t2 = std::chrono::system_clock::now();
+}
-    auto d = std::chrono::duration_cast<std::chrono::milliseconds>(t2 - t1);
+*/
-    Logger::info("Chunk Block Init Finish, Time Consuming: {}", d);
-    // init players
-    m_players.emplace(HASH::str("TestPlayer"), Player(*this, "TestPlayer"));
-    Logger::info("TestPlayer Create Finish");
 
-    start_gen_thread();
+void World::init_chunks() {
+    for (auto& [pos, chunks] : m_chunks) {
+        chunks.gen_phase_one();
+    }
+    std::array<const Chunk*, 4> neighbor_chunks;
+    for (auto& [pos, chunks] : m_chunks) {
+        for (int i = 0; i < 4; i++) {
+            auto neighbor_pos = pos + CHUNK_DIR[i];
+            auto it = m_chunks.find(neighbor_pos);
+            if (it == m_chunks.end()) {
+                neighbor_chunks[i] = nullptr;
+                continue;
+            }
+            neighbor_chunks[i] = &it->second;
+            
+        }
+        chunks.gen_phase_two(neighbor_chunks);
+    }
+
+    for (auto& [pos, chunks] : m_chunks) {
+        chunks.gen_phase_three();
+    }
+    std::array<std::optional<HeightMapArray>, 4> neighbor_chunk_heightmap;
+    for (auto& [pos, chunks] : m_chunks) {
+        for (int i = 0; i < 4; i++) {
+            auto neighbor_pos = pos + CHUNK_DIR[i];
+            auto it = m_chunks.find(neighbor_pos);
+            if (it == m_chunks.end()) {
+                neighbor_chunk_heightmap[i] = std::nullopt;
+                continue;
+            }
+            neighbor_chunk_heightmap[i] = it->second.get_heightmap();
+            
+        }
+        chunks.gen_phase_four(neighbor_chunk_heightmap);
+    }
+
+    for (auto& [pos, chunks] : m_chunks) {
+        chunks.gen_phase_five();
+        chunks.gen_phase_six();
+    }
+
+    std::atomic<int> sync{0};
+    sync.store(1, std::memory_order_release);
+    sync.load(std::memory_order_acquire);
+    
+    std::vector<ChunkRenderData> pending_gen_data;
+    pending_gen_data.reserve(m_chunks.size());
+    for (auto& [pos, chunk] : m_chunks) {
+        ChunkRenderData data;
+        data.chunk = &chunk;
+        for (int i = 0; i < 4; i++) {    
+            auto it = m_chunks.find(pos + CHUNK_DIR[i]);
+            if (it != m_chunks.end()) {
+                data.neighbor_block[i] = &(it->second.get_chunk_blocks());
+            } else {
+                data.neighbor_block[i] = nullptr;
+            }
+        }
+        pending_gen_data.emplace_back(std::move(data));
+    }
+    std::for_each(std::execution::par, pending_gen_data.begin(), pending_gen_data.end(), [](ChunkRenderData& data){
+        if(!data.chunk) {
+            return ;
+        }
+        data.chunk->gen_vertex_data(data.neighbor_block);
+    });
+    for (auto& chunk_map : m_chunks) {
+        auto& [chunk_pos, chunk] = chunk_map;
+        chunk.upload_to_gpu();
+        
+    }
 
 }
 
@@ -215,6 +275,7 @@ void World::gen_chunks_internal() {
     
     Logger::info("New Gen Chunks Sum: {}", need_gen_chunks_pos.size());
     if (need_gen_chunks_pos.empty()) {
+        m_could_gen = true;
         return;
     }
     ChunkUpdateList new_chunks;
@@ -229,8 +290,49 @@ void World::gen_chunks_internal() {
     
     std::array<const std::vector<uint8_t>*, 4> neighbor_block;
     // build new chunk, but the neighbor in m_chunks also need to re-build
+
     for (auto& [pos, chunk] : new_chunks) {
-        chunk.init_chunk();
+        chunk.gen_phase_one();
+    }
+
+    std::array<const Chunk*, 4> neighbor_chunks;
+    for (auto& [pos, chunks] : new_chunks) {
+        for (int i = 0; i < 4; i++) {
+            auto neighbor_pos = pos + CHUNK_DIR[i];
+            auto it = new_chunks_neighbor.find(neighbor_pos);
+            if (it == new_chunks_neighbor.end()) {
+                neighbor_chunks[i] = nullptr;
+                continue;
+            }
+            neighbor_chunks[i] = it->second;
+            
+        }
+        chunks.gen_phase_two(neighbor_chunks);
+    }
+
+    for (auto& [pos, chunks] : new_chunks) {
+        chunks.gen_phase_three();
+    }
+    std::array<std::optional<HeightMapArray>, 4> neighbor_chunk_heightmap;
+    for (auto& [pos, chunks] : new_chunks) {
+        {
+            //std::lock_guard lk(m_chunks_mutex);
+            for (int i = 0; i < 4; i++) {
+                auto neighbor_pos = pos + CHUNK_DIR[i];
+                auto it = new_chunks_neighbor.find(neighbor_pos);
+                if (it == new_chunks_neighbor.end()) {
+                    neighbor_chunk_heightmap[i] = std::nullopt;
+                    continue;
+                }
+                neighbor_chunk_heightmap[i] = it->second->get_heightmap();
+            }
+        }
+        chunks.gen_phase_four(neighbor_chunk_heightmap);
+    }
+
+    for (auto& [pos, chunks] : new_chunks) {
+        chunks.gen_phase_five();
+        chunks.gen_phase_six();
     }
 
     for (auto& [pos, chunk] : new_chunks) {
@@ -371,6 +473,11 @@ void World::stop_gen_thread() {
 }
 
 void World::need_gen() {
+    if (!m_could_gen) {
+        Logger::warn("It is generating or consuming new chunks");
+        return;
+    }
+    m_could_gen = false;
     {
         std::lock_guard lk(m_gen_player_pos_mutex);
         m_gen_player_pos = get_player("TestPlayer").get_player_pos();
@@ -509,9 +616,16 @@ void World::update(float delta_time) {
     // unified compute vertex data before rendering
     {   
         std::lock_guard lk(m_chunks_mutex);
+        bool consumed = false;
+        
         for (auto& x : m_new_chunk) {
             m_chunks.insert_or_assign(x.first, std::move(x.second));
+            consumed = true;
         }
+        if (consumed) {
+            m_could_gen = true;
+        }
+        
         m_render_snapshots.clear();
         for (auto& [pos, chunk] : m_chunks) {
             if (chunk.is_dirty()) {