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scene viewer: can select a scene from the asset path (#6859)
# Objective - Fixes #6630, fixes #6679 - Improve scene viewer in cases where there are more than one scene in a gltf file ## Solution - Can select which scene to display using `#SceneN`, defaults to scene 0 if not present - Display the number of scenes available if there are more than one
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1 changed files with 43 additions and 7 deletions
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@ -1,8 +1,9 @@
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//! A simple glTF scene viewer made with Bevy.
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//!
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//! Just run `cargo run --release --example scene_viewer /path/to/model.gltf#Scene0`,
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//! Just run `cargo run --release --example scene_viewer /path/to/model.gltf`,
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//! replacing the path as appropriate.
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//! With no arguments it will load the `FieldHelmet` glTF model from the repository assets subdirectory.
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//! In case of multiple scenes, you can select which to display by adapting the file path: `/path/to/model.gltf#Scene1`.
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//! With no arguments it will load the `FlightHelmet` glTF model from the repository assets subdirectory.
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use bevy::{
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asset::LoadState,
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@ -77,7 +78,8 @@ Controls:
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#[derive(Resource)]
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struct SceneHandle {
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handle: Handle<Gltf>,
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gltf_handle: Handle<Gltf>,
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scene_index: usize,
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#[cfg(feature = "animation")]
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animations: Vec<Handle<AnimationClip>>,
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instance_id: Option<InstanceId>,
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@ -85,13 +87,30 @@ struct SceneHandle {
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has_light: bool,
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}
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fn parse_scene(scene_path: String) -> (String, usize) {
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if scene_path.contains('#') {
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let gltf_and_scene = scene_path.split('#').collect::<Vec<_>>();
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if let Some((last, path)) = gltf_and_scene.split_last() {
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if let Some(index) = last
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.strip_prefix("Scene")
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.and_then(|index| index.parse::<usize>().ok())
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{
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return (path.join("#"), index);
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}
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}
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}
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(scene_path, 0)
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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let scene_path = std::env::args()
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.nth(1)
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.unwrap_or_else(|| "assets/models/FlightHelmet/FlightHelmet.gltf".to_string());
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info!("Loading {}", scene_path);
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let (file_path, scene_index) = parse_scene(scene_path);
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commands.insert_resource(SceneHandle {
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handle: asset_server.load(&scene_path),
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gltf_handle: asset_server.load(&file_path),
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scene_index,
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#[cfg(feature = "animation")]
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animations: Vec::new(),
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instance_id: None,
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@ -109,9 +128,26 @@ fn scene_load_check(
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) {
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match scene_handle.instance_id {
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None => {
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if asset_server.get_load_state(&scene_handle.handle) == LoadState::Loaded {
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let gltf = gltf_assets.get(&scene_handle.handle).unwrap();
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let gltf_scene_handle = gltf.scenes.first().expect("glTF file contains no scenes!");
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if asset_server.get_load_state(&scene_handle.gltf_handle) == LoadState::Loaded {
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let gltf = gltf_assets.get(&scene_handle.gltf_handle).unwrap();
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if gltf.scenes.len() > 1 {
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info!(
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"Displaying scene {} out of {}",
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scene_handle.scene_index,
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gltf.scenes.len()
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);
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info!("You can select the scene by adding '#Scene' followed by a number to the end of the file path (e.g '#Scene1' to load the second scene).");
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}
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let gltf_scene_handle =
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gltf.scenes
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.get(scene_handle.scene_index)
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.unwrap_or_else(|| {
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panic!(
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"glTF file doesn't contain scene {}!",
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scene_handle.scene_index
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)
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});
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let scene = scenes.get_mut(gltf_scene_handle).unwrap();
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let mut query = scene
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