more required components and other stuff

Signed-off-by: Schmarni <marnistromer@gmail.com>

crates/bevy_openxr/examples/sessions.rs

@@ -1,12 +1,19 @@
 //! A simple 3D scene with light shining over a cube sitting on a plane.
 
 use bevy::prelude::*;
-use bevy_mod_openxr::add_xr_plugins;
+use bevy_mod_openxr::{add_xr_plugins, init::OxrInitPlugin};
 use bevy_mod_xr::session::{XrSessionPlugin, XrState};
 
 fn main() {
     App::new()
-        .add_plugins(add_xr_plugins(DefaultPlugins).set(XrSessionPlugin { auto_handle: true }))
+        .add_plugins(
+            add_xr_plugins(DefaultPlugins)
+                .set(XrSessionPlugin { auto_handle: true })
+                .set(OxrInitPlugin {
+                    blend_modes: Some(vec![openxr::EnvironmentBlendMode::OPAQUE]),
+                    ..Default::default()
+                }),
+        )
         .add_plugins(bevy_xr_utils::hand_gizmos::HandGizmosPlugin)
         .add_systems(Startup, setup)
         .add_systems(Update, handle_input)