Adding Mixamo Animations to Studio Headless (#50)

This PR adds the ability to render out mixamo animations from the
headless mode. In addition to that, there were some bugs that have been
managed and some readability changes. Let me know if you have any
questions!

studio/src/scene.rs

@@ -48,7 +48,12 @@ impl Plugin for ScenePlugin {
             .add_systems(Update, init_scene_loading.in_set(SceneSpawnerSystem))
             .add_systems(
                 OnEnter(SceneState::Active),
-                (tag_scene_elements, frame_scene_in_view).in_set(SceneSpawnerSystem),
+                (
+                    tag_scene_elements,
+                    frame_scene_in_view,
+                    start_capture.run_if(is_headless),
+                )
+                    .in_set(SceneSpawnerSystem),
             );
 
         app.add_systems(Update, tag_scene_elements);
@@ -261,10 +266,7 @@ fn initialiaze_headless(
             ..default()
         },
         CameraControllerBundle::new(focus, camera_xform.translation),
-        ScreenCapture::number_of_frames(
-            headless_settings.frames_to_capture,
-            &headless_settings.output_dir,
-        ),
+        ScreenCapture::from_out(&headless_settings.output_dir),
     ));
 }
 
@@ -429,6 +431,12 @@ fn frame_scene_in_view(
     cam_xform.translation = cam.focus + cam_xform.back() * radius;
 }
 
+fn start_capture(mut captures: Query<&mut ScreenCapture>) {
+    for mut capture in captures.iter_mut() {
+        capture.start_capturing();
+    }
+}
+
 #[cfg(feature = "wasm")]
 mod wasm {
     use bevy::{prelude::*, window::PrimaryWindow};