fixed endless running bug

studio/src/main-headless.rs

@@ -1,4 +1,4 @@
-use bevy::render::render_resource::Extent3d;
+use bevy::{prelude::*, render::render_resource::Extent3d, transform::components::Transform, window::PrimaryWindow};
 use clap::{Args, Parser, Subcommand};
 use studio::headless::{start_headless, HeadlessMode};
 
@@ -19,6 +19,8 @@ struct StudioArgs {
 enum Subcommands {
     Scene {
         scene_dir: String,
+        #[arg(long)]
+        orbit : bool,
         #[arg(long, short)]
         output_dir: Option<String>,
         #[arg(long)]
@@ -67,6 +69,7 @@ fn main() {
     let mut app = match args.subcommand {
         Subcommands::Scene {
             scene_dir,
+            orbit,
             skybox,
             output_dir,
             output_resolution,
@@ -82,13 +85,23 @@ fn main() {
             let fps = fps.unwrap_or(24);
             let frames = frames.unwrap_or(30);
             let skybox = skybox.unwrap_or("gum_trees_4k".to_string());
-            start_headless(
+            let mut app = start_headless(
                 HeadlessMode::Scene(scene_dir, skybox),
                 fps,
                 &output_dir,
                 frames,
                 output_res,
-            )
+            );
+            
+            if orbit {
+                app.insert_resource(OrbitSettings {
+                    radius: 10.0,
+                })
+                .add_systems(Update, orbit_scene)
+                ;
+            }
+            
+            app
         }
         Subcommands::Bvh {
             bvh_dir,
@@ -145,6 +158,22 @@ fn main() {
     app.run();
 }
 
+#[derive(Resource)]
+struct OrbitSettings {
+    radius: f32,
+}
+
+fn orbit_scene (
+    mut camera : Query<&mut Transform, With<PrimaryWindow>>,
+    orbit_settings : Res<OrbitSettings>,
+    time : Res<Time>
+) {
+    let Ok(mut main_cam_transform) = camera.get_single_mut() else { return };
+    
+    main_cam_transform.translation = Vec3::new(orbit_settings.radius * time.elapsed_seconds().cos(), orbit_settings.radius * time.elapsed_seconds().sin(), 6.0);
+    main_cam_transform.look_at(Vec3::ZERO, Vec3::Y);
+}
+
 //==============================================================================
 //                        Parsers
 //==============================================================================