Add set_voxel example

Cargo.toml

@@ -29,7 +29,3 @@ rand = "0.8.5"
 
 [dev-dependencies]
 noise = "0.8.2"
-
-[[example]]
-name = "noise_terrain"
-path = "examples/noise_terrain.rs"

examples/set_voxel.rs

@@ -0,0 +1,55 @@
+use bevy::prelude::*;
+use bevy_voxel_world::prelude::*;
+use rand::Rng;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_plugins(VoxelWorldPlugin::default())
+        .add_systems(Startup, setup)
+        .add_systems(Update, (set_solid_voxel, move_camera))
+        .run();
+}
+
+fn setup(mut commands: Commands) {
+    // Camera
+    commands.spawn((
+        Camera3dBundle {
+            transform: Transform::from_xyz(20.0, 20.0, 20.0).looking_at(Vec3::ZERO, Vec3::Y),
+            ..default()
+        },
+        // This tells bevy_voxel_world tos use this cameras transform to calculate spawning area
+        VoxelWorldCamera,
+    ));
+
+    // Ambient light
+    commands.insert_resource(AmbientLight {
+        color: Color::rgb(0.98, 0.95, 0.82),
+        brightness: 1.0,
+    });
+}
+
+fn set_solid_voxel(mut voxel_world: VoxelWorld) {
+    // Gnerate some random values
+    let size = 10;
+    let mut rng = rand::thread_rng();
+    let x = rng.gen_range(-size..size);
+    let y = rng.gen_range(-size..size);
+    let z = rng.gen_range(-size..size);
+    let voxel_type = rng.gen_range(0..4);
+    let pos = IVec3::new(x, y, z);
+
+    // Set a voxel at the random position with the random type
+    if pos.distance_squared(IVec3::ZERO) < i32::pow(size, 2) {
+        voxel_world.set_voxel(pos, WorldVoxel::Solid(voxel_type));
+    }
+}
+
+// animate camera back and forth
+fn move_camera(time: Res<Time>, mut query: Query<&mut Transform, With<VoxelWorldCamera>>) {
+    let mut transform = query.single_mut();
+    let time_seconds = time.elapsed_seconds();
+    transform.translation.x = 25.0 * (time_seconds * 0.1).sin();
+    transform.translation.z = 25.0 * (time_seconds * 0.1).cos();
+    transform.look_at(Vec3::ZERO, Vec3::Y);
+}