initial working demo sans networking

Signed-off-by: Sienna Meridian Satterwhite <sienna@r3t.io>

crates/app/src/rendering.rs

@@ -0,0 +1,53 @@
+//! Lighting and ground plane setup
+
+use bevy::prelude::*;
+
+pub struct RenderingPlugin;
+
+impl Plugin for RenderingPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_systems(Startup, setup_lighting_and_ground);
+    }
+}
+
+/// Set up lighting and ground plane
+///
+/// Creates a directional light (sun), ambient light, and a green ground plane.
+/// Camera setup is handled separately in the camera module.
+fn setup_lighting_and_ground(
+    mut commands: Commands,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<StandardMaterial>>,
+) {
+    info!("Setting up lighting and ground plane");
+
+    // Directional light (sun)
+    commands.spawn((
+        DirectionalLight {
+            illuminance: 10000.0,
+            shadows_enabled: true,
+            ..default()
+        },
+        Transform::from_xyz(4.0, 8.0, 4.0).looking_at(Vec3::ZERO, Vec3::Y),
+    ));
+
+    // Ambient light
+    commands.insert_resource(AmbientLight {
+        color: Color::WHITE,
+        brightness: 150.0,
+        affects_lightmapped_meshes: false,
+    });
+
+    // Ground plane
+    commands.spawn((
+        Mesh3d(meshes.add(Plane3d::default().mesh().size(20.0, 20.0))),
+        MeshMaterial3d(materials.add(StandardMaterial {
+            base_color: Color::srgb(0.3, 0.5, 0.3),
+            perceptual_roughness: 0.9,
+            ..default()
+        })),
+        Transform::from_xyz(0.0, 0.0, 0.0),
+    ));
+
+    info!("Lighting and ground setup complete");
+}