diff --git a/src/graphics/core/Shadows.cpp b/src/graphics/core/Shadows.cpp
index 19ba7d000..c9ecc108d 100644
--- a/src/graphics/core/Shadows.cpp
+++ b/src/graphics/core/Shadows.cpp
@@ -130,21 +130,22 @@ void Shadows::refresh(
     const std::function<void(Camera&)>& renderShadowPass
 ) {
     static int frameid = 0;
-    if (shadows) {
-        if (frameid % 2 == 0) {
-            generateShadowsMap(
-                camera, pctx, *shadowMap, shadowCamera, 1.0f, renderShadowPass
-            );
-        } else {
-            generateShadowsMap(
-                camera,
-                pctx,
-                *wideShadowMap,
-                wideShadowCamera,
-                3.0f,
-                renderShadowPass
-            );
-        }
+    if (!shadows) {
+        return;
+    }
+    if (frameid % 2 == 0) {
+        generateShadowsMap(
+            camera, pctx, *shadowMap, shadowCamera, 1.0f, renderShadowPass
+        );
+    } else {
+        generateShadowsMap(
+            camera,
+            pctx,
+            *wideShadowMap,
+            wideShadowCamera,
+            3.0f,
+            renderShadowPass
+        );
     }
     frameid++;
 }
@@ -176,10 +177,7 @@ void Shadows::generateShadowsMap(
     shadowCamera.setAspectRatio(1.0f);
 
     float t = worldInfo.daytime - 0.25f;
-    if (t < 0.0f) {
-        t += 1.0f;
-    }
-    t = fmod(t, 0.5f);
+    t = glm::mod(t < 0.0f ? t + 1.0f : t, 0.5f);
 
     float sunCycleStep = 1.0f / 500.0f;
     float sunAngle = glm::radians(
@@ -206,15 +204,13 @@ void Shadows::generateShadowsMap(
 
     shadowCamera.setProjection(glm::ortho(min.x, max.x, min.y, max.y, 0.1f, 1000.0f));
 
-    {
-        auto sctx = pctx.sub();
-        sctx.setDepthTest(true);
-        sctx.setCullFace(true);
-        sctx.setViewport({resolution, resolution});
-        shadowMap.bind();
-        if (renderShadowPass) {
-            renderShadowPass(shadowCamera);
-        }
-        shadowMap.unbind();
+    auto sctx = pctx.sub();
+    sctx.setDepthTest(true);
+    sctx.setCullFace(true);
+    sctx.setViewport({resolution, resolution});
+    shadowMap.bind();
+    if (renderShadowPass) {
+        renderShadowPass(shadowCamera);
     }
+    shadowMap.unbind();
 }
diff --git a/src/graphics/render/CloudsRenderer.cpp b/src/graphics/render/CloudsRenderer.cpp
new file mode 100755
index 000000000..c013f958f
--- /dev/null
+++ b/src/graphics/render/CloudsRenderer.cpp
@@ -0,0 +1,251 @@
+#include "CloudsRenderer.hpp"
+
+#include "assets/Assets.hpp"
+#include "coders/imageio.hpp"
+#include "debug/Logger.hpp"
+#include "graphics/core/ImageData.hpp"
+#include "graphics/core/Mesh.hpp"
+#include "graphics/core/Shader.hpp"
+#include "graphics/core/Texture.hpp"
+#include "io/io.hpp"
+#include "lighting/Lightmap.hpp"
+#include "maths/FastNoiseLite.h"
+#include "util/timeutil.hpp"
+#include "window/Camera.hpp"
+
+#include <glm/ext.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+static debug::Logger logger("clouds-render");
+
+class CloudsMap {
+public:
+    glm::ivec3 size;
+    const bool* voxels;
+
+    CloudsMap() = default;
+
+    CloudsMap(const glm::ivec3& size, const bool* voxels)
+        : size(size), voxels(voxels) {
+    }
+
+    bool isOpen(int x, int y, int z) const {
+        if (x >= 0 && x < size.x && y >= 0 && y < size.y && z >= 0 && z < size.z) {
+            return !voxels[vox_index(x, y, z, size.x, size.z)];
+        }
+        return true;
+    }
+};
+
+
+class VolumeRenderer final {
+public:
+    VolumeRenderer(size_t capacity)
+        : vertices(std::make_unique<ChunkVertex[]>(capacity)),
+          indexBuffer(std::make_unique<uint32_t[]>(capacity * 6)),
+          capacity(capacity) {
+    }
+
+    ~VolumeRenderer() = default;
+
+    void build(CloudsMap volumeMap) {
+        this->map = std::move(volumeMap);
+        overflow = false;
+        offset = 0;
+        indexOffset = 0;
+        indexCount = 0;
+
+        int end = map.size.x * map.size.y * map.size.z;
+        for (int i = 0; i < end; i++) {
+            int x = i % map.size.x;
+            int y = i / (map.size.z * map.size.x);
+            int z = (i / map.size.x) % map.size.z;
+            const auto& vox = map.voxels[i];
+            if (!vox) {
+                continue;
+            }
+            cube({x, y, z});
+            if (overflow) {
+                return;
+            }
+        }
+        logger.info() << "layer vertices: " << offset;
+    }
+
+    MeshData<ChunkVertex> createMesh() const {
+        return MeshData(
+            util::Buffer(vertices.get(), offset),
+            std::vector<util::Buffer<uint32_t>> {
+                util::Buffer(indexBuffer.get(), indexCount),
+            },
+            util::Buffer(
+                ChunkVertex::ATTRIBUTES,
+                sizeof(ChunkVertex::ATTRIBUTES) / sizeof(VertexAttribute)
+            )
+        );
+    }
+
+private:
+    std::unique_ptr<ChunkVertex[]> vertices;
+    std::unique_ptr<uint32_t[]> indexBuffer;
+    size_t capacity;
+    uint32_t indexOffset = 0;
+    uint32_t indexCount = 0;
+    uint32_t offset = 0;
+    bool overflow = false;
+    CloudsMap map {};
+
+    void vertex(
+        const glm::vec3& coord,
+        const glm::vec3& normal
+    ) {
+        auto& vert = vertices[offset++];
+        vert.position = coord;
+        vert.uv = {};
+        vert.normal = {
+            static_cast<uint8_t>(normal.r * 127 + 128),
+            static_cast<uint8_t>(normal.g * 127 + 128),
+            static_cast<uint8_t>(normal.b * 127 + 128),
+            255
+        };
+        vert.color = {
+            0, 0, 0, static_cast<uint8_t>((coord.y / 8.0f * 0.25f + 0.75f) * 255)
+        };
+    }
+
+    void face(
+        const glm::vec3& coord,
+        const glm::vec3& X,
+        const glm::vec3& Y,
+        const glm::vec3& Z
+    ) {
+        if (!isOpen(coord + Z)) {
+            return;
+        }
+        if (offset + 4 >= capacity) {
+            overflow = true;
+            return;
+        }
+
+        float s = 0.5f;
+        vertex(coord + (-X - Y + Z) * s, Z);
+        vertex(coord + ( X - Y + Z) * s, Z);
+        vertex(coord + ( X + Y + Z) * s, Z);
+        vertex(coord + (-X + Y + Z) * s, Z);
+
+        const uint32_t indices[] {0, 1, 2, 0, 2, 3};
+        for (size_t i = 0; i < 6; i++) {
+            indexBuffer[indexCount++] = indexOffset + indices[i];
+        }
+        indexOffset += 4;
+    }
+
+    bool isOpen(const glm::ivec3& pos) const {
+        return pos.y < 0 || pos.y >= map.size.y ||
+               map.isOpen(pos.x, pos.y, pos.z);
+    }
+
+    void cube(const glm::ivec3& coord) {
+        const glm::ivec3 X(1, 0, 0);
+        const glm::ivec3 Y(0, 1, 0);
+        const glm::ivec3 Z(0, 0, 1);
+
+        face(coord, X, Y, Z);
+        face(coord, -X, Y, -Z);
+        face(coord, X, -Z, Y);
+        face(coord, X, Z, -Y);
+        face(coord, -Z, Y, X);
+        face(coord, Z, Y, -X);
+    }
+};
+
+static inline constexpr int WIDTH = 256 / 2;
+static inline constexpr int DEPTH = 256 / 2;
+
+
+CloudsRenderer::CloudsRenderer(const Assets& assets) : assets(assets) {
+    timeutil::ScopeLogTimer log(111);
+
+    VolumeRenderer volumeRenderer(1024 * 1024);
+
+    for (int layer = 0; layer < 2; layer++) {
+        fnl_state state = fnlCreateState();
+        const int w = WIDTH;
+        const int h = 8;
+        const int d = DEPTH;
+
+        state.seed = 52365 + layer * 3521;
+
+        bool voxels[w * h * d];
+        for (int y = 0; y < h; y++) {
+            for (int z = 0; z < d; z++) {
+                for (int x = 0; x < w; x++) {
+                    float s = 2.0f;
+                    auto n = fnlGetNoise2D(&state, x * s, z * s);
+                    n += fnlGetNoise2D(&state, x * s + fnlGetNoise2D(&state, x * s * 4 + 2, z * s * 4) * 0.25f, z * 3.0f) * 0.5f;
+                    n += fnlGetNoise2D(&state, x * s * 2, z * s * 2) * 0.25f;
+                    n += fnlGetNoise2D(&state, x * s * 4, z * s * 4) * 0.125f * 2;
+                    n += fnlGetNoise2D(&state, x * s * 8, z * s * 8) * 0.125f * 0.5f * 2;
+                    n += fnlGetNoise2D(&state, x * s * 16, z * s * 16) * 0.125f * 0.25f * 3;
+                    n = glm::max(0.0f, n);
+                    // n = n * n * 2.0f;
+                    n -= 0.2f + layer * 0.5f;
+                    // n -= 0.5f;
+
+                    bool solid = y <= n * h && y >= (0.5f - n * 0.5f) * h;
+                    voxels[vox_index(x, y, z, w, d)] = solid;
+                }
+            }
+        }
+        
+        CloudsMap map({w, h, d}, voxels);
+
+        timeutil::ScopeLogTimer log2(222);
+        volumeRenderer.build(map);
+        testMeshes[layer] = std::make_unique<Mesh<ChunkVertex>>(volumeRenderer.createMesh());
+    }
+}
+
+CloudsRenderer::~CloudsRenderer() = default;
+
+#include "util/timeutil.hpp"
+
+void CloudsRenderer::draw(float timer, float fogFactor, const Camera& camera) {
+    auto& shader = assets.require<Shader>("main");
+    assets.require<Texture>("misc/blank").bind();
+
+    float scale = 15;
+    float totalWidth = WIDTH * scale;
+    float totalDepth = DEPTH * scale;
+
+    int cellX = glm::round(camera.position.x / totalWidth);
+    int cellZ = glm::round(camera.position.z / totalDepth);
+
+    float speed = 10.0f;
+    
+    timeutil::ScopeLogTimer log(555);
+
+    for (int i = 0; i < 2; i++) {
+        float speedX = glm::sin(i * 0.3f) * speed / (i + 1);
+        float speedZ = -glm::cos(i * 0.3f) * speed / (i + 1);
+        for (int x = -2; x <= 2; x++) {
+            for (int z = -2; z <= 2; z++) {
+                auto matrix = glm::mat4(1.0f);
+                // matrix = glm::rotate(matrix, timer * 0.003f * (i % 2 * 2 - 1) + i, glm::vec3(0, 1, 0));
+                matrix = glm::translate(
+                    matrix,
+                    glm::vec3(
+                        -128 * scale + (x + cellX) * WIDTH * scale + glm::mod(timer * speedX, totalWidth),
+                        250 + i * 200,
+                        -128 * scale + (z + cellZ) * DEPTH * scale + glm::mod(timer * speedZ, totalDepth)
+                    )
+                );
+                matrix = glm::scale(matrix, glm::vec3(scale, scale, scale));
+                shader.uniform1f("u_fogFactor", fogFactor * 0.03f);
+                shader.uniform1f("u_fogCurve", 0.7f - 0.3f);
+                shader.uniformMatrix("u_model", matrix);
+                testMeshes[i]->draw();
+            }
+        }
+    }
+}
diff --git a/src/graphics/render/CloudsRenderer.hpp b/src/graphics/render/CloudsRenderer.hpp
new file mode 100755
index 000000000..2eec12e53
--- /dev/null
+++ b/src/graphics/render/CloudsRenderer.hpp
@@ -0,0 +1,19 @@
+#pragma once
+
+#include "commons.hpp"
+
+#include <memory>
+
+class Assets;
+class Camera;
+
+class CloudsRenderer final {
+public:
+    CloudsRenderer(const Assets& assets);
+    ~CloudsRenderer();
+
+    void draw(float timer, float fogFactor, const Camera& camera);
+private:
+    const Assets& assets;
+    std::array<std::unique_ptr<Mesh<ChunkVertex>>, 2> testMeshes;
+};
diff --git a/src/graphics/render/WorldRenderer.cpp b/src/graphics/render/WorldRenderer.cpp
index 98a065f3c..b00a6756e 100644
--- a/src/graphics/render/WorldRenderer.cpp
+++ b/src/graphics/render/WorldRenderer.cpp
@@ -50,6 +50,7 @@
 #include "Skybox.hpp"
 #include "Emitter.hpp"
 #include "TextNote.hpp"
+#include "CloudsRenderer.hpp"
 
 #include <assert.h>
 #include <algorithm>
@@ -116,6 +117,7 @@ WorldRenderer::WorldRenderer(
     );
     shadowMapping = std::make_unique<Shadows>(level);
     debugLines = std::make_unique<DebugLinesRenderer>(level);
+    cloudsRenderer = std::make_unique<CloudsRenderer>(assets);
 }
 
 WorldRenderer::~WorldRenderer() = default;
@@ -210,6 +212,7 @@ void WorldRenderer::renderOpaque(
     setupWorldShader(shader, camera, settings, fogFactor);
 
     chunksRenderer->drawChunks(camera, shader);
+    cloudsRenderer->draw(timer, fogFactor, camera);
     blockWraps->draw(ctx, player);
 
     if (hudVisible) {
@@ -369,7 +372,7 @@ void WorldRenderer::renderFrame(
         if (gbufferPipeline) {
             postProcessing.bindDepthBuffer();
         } else {
-            postProcessing.getFramebuffer()->bind();
+            ctx.setFramebuffer(postProcessing.getFramebuffer());
         }
 
         // Background sky plane
@@ -448,43 +451,45 @@ void WorldRenderer::renderBlockOverlay(const DrawContext& wctx) {
     int y = std::floor(player.currentCamera->position.y);
     int z = std::floor(player.currentCamera->position.z);
     auto block = player.chunks->get(x, y, z);
-    if (block && block->id) {
-        const auto& def = level.content.getIndices()->blocks.require(block->id);
-        if (def.overlayTexture.empty()) {
-            return;
-        }
-        auto textureRegion = util::get_texture_region(
-            assets, def.overlayTexture, "blocks:notfound"
-        );
-        DrawContext ctx = wctx.sub();
-        ctx.setDepthTest(false);
-        ctx.setCullFace(false);
-        
-        auto& shader = assets.require<Shader>("ui3d");
-        shader.use();
-        batch3d->begin();
-        shader.uniformMatrix("u_projview", glm::mat4(1.0f));
-        shader.uniformMatrix("u_apply", glm::mat4(1.0f));
-        auto light = player.chunks->getLight(x, y, z);
-        float s = Lightmap::extract(light, 3) / 15.0f;
-        glm::vec4 tint(
-            glm::min(1.0f, Lightmap::extract(light, 0) / 15.0f + s),
-            glm::min(1.0f, Lightmap::extract(light, 1) / 15.0f + s),
-            glm::min(1.0f, Lightmap::extract(light, 2) / 15.0f + s),
-            1.0f
-        );
-        batch3d->texture(textureRegion.texture);
-        batch3d->sprite(
-            glm::vec3(),
-            glm::vec3(0, 1, 0),
-            glm::vec3(1, 0, 0),
-            2,
-            2,
-            textureRegion.region,
-            tint
-        );
-        batch3d->flush();
+
+    if (block == nullptr || block->id == BLOCK_AIR || block->id == BLOCK_VOID) {
+        return;
     }
+    const auto& def = level.content.getIndices()->blocks.require(block->id);
+    if (def.overlayTexture.empty()) {
+        return;
+    }
+    auto textureRegion = util::get_texture_region(
+        assets, def.overlayTexture, "blocks:notfound"
+    );
+    DrawContext ctx = wctx.sub();
+    ctx.setDepthTest(false);
+    ctx.setCullFace(false);
+    
+    auto& shader = assets.require<Shader>("ui3d");
+    shader.use();
+    batch3d->begin();
+    shader.uniformMatrix("u_projview", glm::mat4(1.0f));
+    shader.uniformMatrix("u_apply", glm::mat4(1.0f));
+    auto light = player.chunks->getLight(x, y, z);
+    float s = Lightmap::extract(light, 3) / 15.0f;
+    glm::vec4 tint(
+        glm::min(1.0f, Lightmap::extract(light, 0) / 15.0f + s),
+        glm::min(1.0f, Lightmap::extract(light, 1) / 15.0f + s),
+        glm::min(1.0f, Lightmap::extract(light, 2) / 15.0f + s),
+        1.0f
+    );
+    batch3d->texture(textureRegion.texture);
+    batch3d->sprite(
+        glm::vec3(),
+        glm::vec3(0, 1, 0),
+        glm::vec3(1, 0, 0),
+        2,
+        2,
+        textureRegion.region,
+        tint
+    );
+    batch3d->flush();
 }
 
 void WorldRenderer::clear() {
diff --git a/src/graphics/render/WorldRenderer.hpp b/src/graphics/render/WorldRenderer.hpp
index d3b1b1a95..b9a893d16 100644
--- a/src/graphics/render/WorldRenderer.hpp
+++ b/src/graphics/render/WorldRenderer.hpp
@@ -34,6 +34,7 @@ class Shader;
 class Shadows;
 class Skybox;
 class TextsRenderer;
+class CloudsRenderer;
 struct EngineSettings;
 
 struct CompileTimeShaderSettings {
@@ -57,6 +58,7 @@ class WorldRenderer {
     std::unique_ptr<Shadows> shadowMapping;
     std::unique_ptr<DebugLinesRenderer> debugLines;
     std::unique_ptr<PrecipitationRenderer> precipitation;
+    std::unique_ptr<CloudsRenderer> cloudsRenderer;
     Weather weather {};
     
     float timer = 0.0f;
diff --git a/src/voxels/VoxelsVolume.cpp b/src/voxels/VoxelsVolume.cpp
new file mode 100644
index 000000000..86ba1a32f
--- /dev/null
+++ b/src/voxels/VoxelsVolume.cpp
@@ -0,0 +1,55 @@
+#include "VoxelsVolume.hpp"
+
+#include "constants.hpp"
+#include "content/Content.hpp"
+#include "voxels/Block.hpp"
+
+#include <assert.h>
+
+void VoxelsVolume::compressInto(VoxelsVolume& dst, const Content& content) const {
+    assert(dst.w < w && dst.h < h && dst.d < d);
+    assert(w % dst.w == 0 && h % dst.h == 0 && d % dst.d == 0);
+
+    int stepW = w / dst.w;
+    int stepH = h / dst.h;
+    int stepD = d / dst.d;
+    int height = dst.h;
+    int depth = dst.d;
+    int width = dst.w;
+
+    auto dstVoxels = dst.getVoxels();
+    auto dstLights = dst.getLights();
+
+    const auto& blockDefs = content.getIndices()->blocks;
+
+    for (int y = 0; y < height; y++) {
+        for (int z = 0; z < depth; z++) {
+            for (int x = 0; x < width; x++) {
+                voxel selectedVoxel {BLOCK_AIR, {}};
+                light_t light = 0;
+                for (int ly = 0; ly < stepH; ly++) {
+                    for (int lz = 0; lz < stepD; lz++) {
+                        for (int lx = 0; lx < stepW; lx++) {
+                            size_t srcIndex = vox_index(
+                                x * stepW + lx, y * stepH + ly, z * stepD, w, d
+                            );
+                            auto vox = voxels[srcIndex];
+                            if (vox.id == BLOCK_VOID) {
+                                continue;
+                            }
+                            const auto& def = blockDefs.require(vox.id);
+                            if (def.rt.solid) {
+                                selectedVoxel = std::move(vox);
+                            } else if (light == 0) {
+                                light = lights[srcIndex];
+                            }
+                        }
+                    }
+                }
+                size_t dstIndex = vox_index(x, y, z, dst.w, dst.d);
+                dstLights[dstIndex] = light;
+                dstVoxels[dstIndex] = std::move(selectedVoxel);
+            }
+        }
+    }
+}
diff --git a/src/voxels/VoxelsVolume.hpp b/src/voxels/VoxelsVolume.hpp
index 14ac0a4f4..471b159c5 100644
--- a/src/voxels/VoxelsVolume.hpp
+++ b/src/voxels/VoxelsVolume.hpp
@@ -6,15 +6,17 @@
 
 #include <cstring>
 
+class Content;
+
 class VoxelsVolume {
 public:
-    static inline constexpr size_t MAX_VOXELS = CHUNK_VOL * 2;
-
     VoxelsVolume(int w, int h, int d)
      : VoxelsVolume(0, 0, 0, w, h, d) {}
 
     VoxelsVolume(int x, int y, int z, int w, int h, int d)
-        : x(x), y(y), z(z), w(w), h(h), d(d) {
+        : x(x), y(y), z(z), w(w), h(h), d(d),
+          voxels(std::make_unique<voxel[]>(w * h * d)),
+          lights(std::make_unique<light_t[]>(w * h * d)) {
         std::memset(voxels.get(), 0xFF, sizeof(voxel) * w * h * d);
     }
 
@@ -52,10 +54,18 @@ public:
         return voxels.get();
     }
 
+    const voxel* getVoxels() const {
+        return voxels.get();
+    }
+
     light_t* getLights() {
         return lights.get();
     }
 
+    const light_t* getLights() const {
+        return lights.get();
+    }
+
     inline blockid_t pickBlockId(int bx, int by, int bz) const {
         if (bx < x || by < y || bz < z || bx >= x + w || by >= y + h ||
             bz >= z + d) {
@@ -80,6 +90,8 @@ public:
         }
         return lights[vox_index(bx - x, by - y, bz - z, w, d)];
     }
+
+    void compressInto(VoxelsVolume& dst, const Content& content) const;
 private:
     int x, y, z;
     int w, h, d;