Some changes

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

@@ -2,21 +2,32 @@ use crate::plugins::big_space::big_space_plugin::RootGrid;
 use crate::plugins::environment::systems::voxels::structure::*;
 use rayon::prelude::*;
 use std::path::Path;
-
+use std::thread;
 use bevy::prelude::*;
 use bevy::render::mesh::*;
 use noise::{NoiseFn, Perlin};
 use rand::{Rng, thread_rng};
 
 pub fn setup(mut commands: Commands, root: Res<RootGrid>) {
+
+
+    let builder = thread::Builder::new()
+        .name("octree-build".into())
+        .stack_size(64 * 4096 * 4096);
+
+    let handle = builder
+        .spawn(move || {
             // Octree parameters
             let unit_size = 1.0_f32;
             let octree_base_size = 64.0 * unit_size;
             let octree_depth = 10;
 
+
+
             let path = Path::new("octree.bin");
 
-    let mut octree = if path.exists() {
+
+            let mut octree = if Path::new(path).exists()  {
                 match SparseVoxelOctree::load_from_file(path) {
                     Ok(tree) => tree,
                     Err(err) => {
@@ -27,8 +38,8 @@ pub fn setup(mut commands: Commands, root: Res<RootGrid>) {
             } else {
                 let mut tree = SparseVoxelOctree::new(octree_depth, octree_base_size, false, false, false);
                 // How many random spheres?
-        /*const NUM_SPHERES: usize = 5;
-        let mut rng = threald_rng();
+                const NUM_SPHERES: usize = 5;
+                let mut rng = thread_rng();
 
                 for _ in 0..NUM_SPHERES {
                     let center = Vec3::new(
@@ -40,18 +51,30 @@ pub fn setup(mut commands: Commands, root: Res<RootGrid>) {
                     let radius = rng.gen_range(20..=150);     // voxels
 
                     generate_voxel_sphere_parallel(&mut tree, center, radius);
-        }*/
+                }
 
-        generate_voxel_sphere(&mut tree, 200);
+                /*generate_voxel_sphere(&mut tree, 200);*/
                 tree
             };
 
+
+            octree
+        })
+        .expect("failed to spawn octree build thread")
+        .join();
+
+    let octree = handle.expect("Failed to join octree build thread");
+
+
     // Attach octree to the scene graph
     commands.entity(root.0).with_children(|parent| {
         parent.spawn((Transform::default(), octree));
     });
 }
 
+
+
+
 pub fn generate_voxel_sphere_parallel(octree: &mut SparseVoxelOctree, center: Vec3, radius: i32) {
     let step = octree.get_spacing_at_depth(octree.max_depth);
     let radius_sq = radius * radius;
@@ -90,7 +113,7 @@ pub fn generate_voxel_sphere_parallel(octree: &mut SparseVoxelOctree, center: Ve
     }
 }
 
-fn generate_voxel_sphere(octree: &mut SparseVoxelOctree, planet_radius: i32) {
+fn generate_voxel_sphere(octree: &mut SparseVoxelOctree, center: Vec3, planet_radius: i32) {
     // For simplicity, we center the sphere around (0,0,0).
     // We'll loop over a cubic region [-planet_radius, +planet_radius] in x, y, z
     let min = -planet_radius;
@@ -112,7 +135,7 @@ fn generate_voxel_sphere(octree: &mut SparseVoxelOctree, planet_radius: i32) {
                     let wx = x as f32 * step;
                     let wy = y as f32 * step;
                     let wz = z as f32 * step;
-                    let position = Vec3::new(wx, wy, wz);
+                    let position = center + Vec3::new(wx, wy, wz);
 
                     // Insert the voxel
                     let voxel = Voxel::random_sides();
@@ -123,6 +146,7 @@ fn generate_voxel_sphere(octree: &mut SparseVoxelOctree, planet_radius: i32) {
     }
 }
 
+
 /// Inserts a 16x256x16 "column" of voxels into the octree at (0,0,0) corner.
 /// If you want it offset or centered differently, just adjust the for-loop ranges or offsets.
 fn generate_voxel_rect(octree: &mut SparseVoxelOctree) {