refactor(server): pass EntityPos to load_around

Cargo.lock

@@ -505,6 +505,9 @@ name = "glam"
 version = "0.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e05e7e6723e3455f4818c7b26e855439f7546cf617ef669d1adedb8669e5cb9"
+dependencies = [
+ "serde",
+]
 
 [[package]]
 name = "glam"
@@ -1412,6 +1415,7 @@ dependencies = [
 name = "server"
 version = "0.1.0"
 dependencies = [
+ "glam 0.27.0",
  "rayon",
  "serde_json",
  "shared",

crates/server/Cargo.toml

@@ -9,6 +9,7 @@ authors.workspace = true
 workspace = true
 
 [dependencies]
+glam = "0.27"
 rayon = "1.12.0"
 serde_json = "1.0.149"
 shared = { version = "0.1.0", path = "../shared" }

crates/server/src/main.rs

@@ -10,7 +10,9 @@ pub mod world_server;
 
 use std::fs;
 
+use glam::Vec3;
 use shared::generator::{VoxelGenerator, WorldGenConfig};
+use shared::world::{ChunkPos, EntityPos};
 use tracing::{debug, info};
 
 fn main() {
@@ -44,5 +46,8 @@ fn main() {
 
     let mut world = world_server::ServerWorld::new(generator);
 
-    world.load_around(0.0, 0.0, 0.0, 4);
+    // Hardcoded spawn stand-in until a real player entity exists; the chunk anchor drives streaming.
+    let player = EntityPos::new(ChunkPos::new(0, 0, 0), Vec3::ZERO);
+
+    world.load_around(player, 4);
 }

crates/server/src/world_server.rs

@@ -5,7 +5,7 @@
 use rayon::prelude::*;
 use shared::{
     generator::VoxelGenerator,
-    world::{Chunk, ChunkPos},
+    world::{Chunk, ChunkPos, EntityPos},
 };
 use std::collections::HashMap;
 
@@ -33,8 +33,9 @@ impl ServerWorld {
     }
 
     /// Generates and caches all chunks in a cylindrical region around the given position.
-    pub fn load_around(&mut self, center_x: f64, center_y: f64, center_z: f64, radius: i32) {
-        let center = ChunkPos::from_world(center_x, center_y, center_z);
+    pub fn load_around(&mut self, center: EntityPos, radius: i32) {
+        // The chunk anchor is the exact streaming key; no lossy world-to-chunk conversion is needed.
+        let center = center.chunk;
 
         // Phase 1: collect the positions inside the cylinder that are not yet resident
         let mut pending = Vec::new();