Added the possibility for loading textures for voxels.

client/Cargo.toml

@@ -23,4 +23,4 @@ rayon = "1.10.0"
 bincode = "1.3"
 bevy_app_compute = "0.16"
 bytemuck = { version = "1.14", features = ["derive"] }
-
+image = { version = "0.24", default-features = false, features = ["png"] }

client/src/plugins/environment/systems/voxel_system.rs

@@ -77,7 +77,7 @@ pub fn generate_voxel_sphere_parallel(octree: &mut SparseVoxelOctree, center: Ve
                             center.y + iy as f32 * step,
                             center.z + iz as f32 * step,
                         );
-                        (pos, Voxel::random_sides())
+                        (pos, Voxel::grass_block())
                     })
                     .collect::<Vec<_>>()
             })
@@ -115,7 +115,7 @@ fn generate_voxel_sphere(octree: &mut SparseVoxelOctree, planet_radius: i32) {
                     let position = Vec3::new(wx, wy, wz);
 
                     // Insert the voxel
-                    let voxel = Voxel::random_sides();
+                    let voxel = Voxel::grass_block();
                     octree.insert(position, voxel);
                 }
             }
@@ -150,7 +150,7 @@ fn generate_voxel_rect(octree: &mut SparseVoxelOctree) {
                 let position = Vec3::new(wx, wy, wz);
 
                 // Insert the voxel
-                let voxel = Voxel::random_sides();
+                let voxel = Voxel::grass_block();
                 octree.insert(position, voxel);
             }
         }
@@ -178,7 +178,7 @@ fn generate_large_plane(octree: &mut SparseVoxelOctree, width: usize, depth: usi
             let position = Vec3::new(wx, wy, wz);
 
             // Insert the voxel
-            let voxel = Voxel::random_sides();
+            let voxel = Voxel::grass_block();
             octree.insert(position, voxel);
         }
     }
@@ -214,9 +214,9 @@ pub fn generate_solid_plane_with_noise(
             for iy in 0..=max_layer {
                 let position = Vec3::new(x * step, iy as f32 * step, z * step);
 
-                let voxel = Voxel::random_sides();
+                let voxel = Voxel::grass_block();
                 octree.insert(position, voxel);
             }
         }
     }
-}
+}

client/src/plugins/environment/systems/voxels/atlas.rs

@@ -1,6 +1,7 @@
 use bevy::asset::RenderAssetUsages;
 use bevy::prelude::*;
 use bevy::render::render_resource::{Extent3d, TextureDimension, TextureFormat};
+use image::GenericImageView;
 
 /// Configuration and handle for the voxel texture atlas.
 #[derive(Resource, Clone)]
@@ -11,32 +12,37 @@ pub struct VoxelTextureAtlas {
 }
 
 impl VoxelTextureAtlas {
-    /// Create a simple procedural atlas with solid colors.
+    /// Generate an atlas from PNG files located in `assets/textures/packs/mc/grass`.
     pub fn generate(images: &mut Assets<Image>) -> Self {
-        let tile_size = 16u32;
-        let columns = 2;
-        let rows = 3;
+        // Include the PNG files at compile time so we don't rely on runtime IO.
+        const TOP: &[u8] = include_bytes!("../../../../../assets/textures/packs/mc/grass/grass_block_top.png");
+        const BOTTOM: &[u8] = include_bytes!("../../../../../assets/textures/packs/mc/grass/dirt.png");
+        const SIDE: &[u8] = include_bytes!("../../../../../assets/textures/packs/mc/grass/grass_block_side.png");
+
+        let textures = [TOP, BOTTOM, SIDE];
+        // Assume all textures have the same dimensions
+        let first = image::load_from_memory(TOP).expect("failed to load texture");
+        let tile_size = first.width();
+
+        let columns = textures.len();
+        let rows = 1usize;
         let width = tile_size * columns as u32;
-        let height = tile_size * rows as u32;
+        let height = tile_size;
         let mut data = vec![0u8; (width * height * 4) as usize];
-        let colors = [
-            [255, 0, 0, 255],   // 0: red
-            [0, 0, 0, 255],     // 1: black
-            [0, 255, 0, 255],   // 2: green
-            [0, 0, 255, 255],   // 3: blue
-            [255, 255, 0, 255], // 4: yellow
-            [255, 0, 255, 255], // 5: magenta
-        ];
-        for (i, col) in colors.iter().enumerate() {
-            let cx = (i % columns) as u32 * tile_size;
-            let cy = (i / columns) as u32 * tile_size;
+
+        for (i, tex_bytes) in textures.iter().enumerate() {
+            let img = image::load_from_memory(tex_bytes)
+                .expect("failed to load texture")
+                .to_rgba8();
             for y in 0..tile_size {
                 for x in 0..tile_size {
-                    let idx = (((cy + y) * width + (cx + x)) * 4) as usize;
-                    data[idx..idx + 4].copy_from_slice(col);
+                    let idx = (((y) * width + x + (i as u32) * tile_size) * 4) as usize;
+                    let pixel = img.get_pixel(x, y).0;
+                    data[idx..idx + 4].copy_from_slice(&pixel);
                 }
             }
         }
+
         let image = Image::new_fill(
             Extent3d {
                 width,
@@ -48,6 +54,7 @@ impl VoxelTextureAtlas {
             TextureFormat::Rgba8UnormSrgb,
             RenderAssetUsages::default(),
         );
+
         let handle = images.add(image);
         Self {
             handle,
@@ -68,4 +75,4 @@ impl VoxelTextureAtlas {
         let v1 = (row + 1) as f32 / rows;
         [[u0, v1], [u1, v1], [u1, v0], [u0, v0]]
     }
-}
+}

client/src/plugins/environment/systems/voxels/structure.rs

@@ -84,6 +84,16 @@ impl Voxel {
         }
         Self { textures }
     }
+    
+    // Generate a simple grass block using the first three atlas indices.
+    /// Index 0: grass top, index 1: dirt (bottom), index 2: grass sides.
+    pub fn grass_block() -> Self {
+        let mut textures = [2usize; 6];
+        // Face order: left, right, bottom, top, back, front
+        textures[3] = 0; // top
+        textures[2] = 1; // bottom
+        Self { textures }
+    }
 }
 
 pub const NEIGHBOR_OFFSETS: [(f32, f32, f32); 6] = [

client/src/plugins/input/systems/voxels.rs

@@ -36,7 +36,7 @@ pub fn voxel_system(
 
     if keyboard_input.just_pressed(KeyCode::KeyQ) && window.cursor_options.visible == false {
         for mut octree in octree_query.iter_mut() {
-            octree.insert(transform.translation, Voxel::random_sides());
+            octree.insert(transform.translation, Voxel::grass_block());
         }
     }
     if keyboard_input.just_pressed(KeyCode::F4) {