LNXSDK/leenkx/Sources/iron/Scene.hx

package iron;

import haxe.ds.Vector;
import kha.graphics4.TextureFormat;
import iron.Trait;
import iron.object.Transform;
import iron.object.Constraint;
import iron.object.Animation;
import iron.object.Object;
import iron.object.CameraObject;
import iron.object.MeshObject;
import iron.object.LightObject;
import iron.object.SpeakerObject;
import iron.object.DecalObject;
import iron.object.ProbeObject;
import iron.object.Tilesheet;
import iron.data.CameraData;
import iron.data.MeshData;
import iron.data.LightData;
import iron.data.ProbeData;
import iron.data.WorldData;
import iron.data.MaterialData;
import iron.data.Armature;
import iron.data.Data;
import iron.data.SceneFormat;
import iron.data.TerrainStream;
import iron.data.SceneStream;
import iron.data.MeshBatch;
import iron.system.Time;
using StringTools;

class Scene {

	public static var active: Scene = null;
	public static var global: Object = null;
	static var uidCounter = 0;
	public var uid: Int;
	public var raw: TSceneFormat;
	public var root: Object;
	public var sceneParent: Object;
	public var camera: CameraObject;
	public var world: WorldData;

	#if lnx_batch
	public var meshBatch: MeshBatch = null;
	#end
	#if lnx_stream
	public var sceneStream: SceneStream = null;
	#end
	#if lnx_terrain
	public var terrainStream: TerrainStream = null;
	#end
	#if rp_decals
	public var decals: Array<DecalObject>;
	#end
	#if rp_probes
	public var probes: Array<ProbeObject>;
	#end
	public var meshes: Array<MeshObject>;
	public var lights: Array<LightObject>;
	public var cameras: Array<CameraObject>;
	#if lnx_audio
	public var speakers: Array<SpeakerObject>;
	#end
	public var empties: Array<Object>;
	public var animations: Array<Animation>;
	public var tilesheets: Array<Tilesheet>;
	#if lnx_skin
	public var armatures: Array<Armature>;
	#end
	var groups: Map<String, Array<Object>> = null;

	public var embedded: Map<String, kha.Image>;

	public var ready: Bool; // Async in progress

	public var traitInits: Array<Void->Void> = [];
	public var traitRemoves: Array<Void->Void> = [];

	var initializing: Bool; // Is the scene in its initialization phase?

	public function new() {
		uid = uidCounter++;
		#if lnx_batch
		meshBatch = new MeshBatch();
		#end
		#if lnx_stream
		sceneStream = new SceneStream();
		#end
		#if rp_decals
		decals = [];
		#end
		#if rp_probes
		probes = [];
		#end
		meshes = [];
		lights = [];
		cameras = [];
		#if lnx_audio
		speakers = [];
		#end
		empties = [];
		animations = [];
		tilesheets = [];
		#if lnx_skin
		armatures = [];
		#end
		embedded = new Map();
		root = new Object();
		root.name = "Root";
		traitInits = [];
		traitRemoves = [];
		initializing = true;
		if (global == null) global = new Object();
	}

	public static function create(format: TSceneFormat, done: Object->Void) {
		active = new Scene();
		active.ready = false;
		active.raw = format;

		Data.getWorld(format.name, format.world_ref, function(world: WorldData) {
			active.world = world;

			// Startup scene
			active.addScene(format.name, null, function(sceneObject: Object) {
				for (object in sceneObject.getChildren(true)) {
					createTraits(object.raw.traits, object);
				}

				#if lnx_terrain
				if (format.terrain_ref != null) {
					active.terrainStream = new TerrainStream(format.terrain_datas[0]);
				}
				#end

				if (active.cameras.length == 0) {
					trace('No camera found for scene "' + format.name + '"');
				}

				active.camera = active.getCamera(format.camera_ref);
				active.sceneParent = sceneObject;

				active.ready = true;

				for (f in active.traitInits) f();
				active.traitInits = [];

				active.initializing = false;
				done(sceneObject);
			});
		});
	}

	#if lnx_patch
	public static var getRenderPath: Void->RenderPath;
	public static function patch() {
		Data.deleteAll();
		var cameraTransform = Scene.active.camera.transform;
		Scene.setActive(Scene.active.raw.name, function(o: Object) {
			RenderPath.setActive(getRenderPath());
			Scene.active.camera.transform = cameraTransform;
		});
	}
	#end

	public function remove() {
		for (f in traitRemoves) f();
		#if lnx_batch
		if (meshBatch != null) meshBatch.remove();
		#end
		#if lnx_stream
		if (sceneStream != null) sceneStream.remove();
		#end
		#if lnx_terrain
		if (terrainStream != null) terrainStream.remove();
		#end
		#if rp_decals
		for (o in decals) o.remove();
		#end
		#if rp_probes
		for (o in probes) o.remove();
		#end
		for (o in meshes) o.remove();
		for (o in lights) o.remove();
		for (o in cameras) o.remove();
		#if lnx_audio
		for (o in speakers) o.remove();
		#end
		for (o in empties) o.remove();
		groups = null;
		root.remove();
	}

	static var framePassed = true;
	public static function setActive(sceneName: String, done: Object->Void = null) {
		if (!framePassed) return;
		framePassed = false;

		// Defer unloading the world shader until the new world shader is loaded
		// to prevent errors due to a missing world shader inbetween
		var removeWorldShader: String = null;

		if (Scene.active != null) {
			#if (rp_background == "World")
			if (Scene.active.raw.world_ref != null) {
				removeWorldShader = "shader_datas/World_" + Scene.active.raw.world_ref + "/World_" + Scene.active.raw.world_ref;
			}
			#end
			Scene.active.remove();
		}

		Data.getSceneRaw(sceneName, function(format: TSceneFormat) {
			Scene.create(format, function(o: Object) {
				if (done != null) done(o);

				#if (rp_background == "World")
				if (removeWorldShader != null) {
					RenderPath.active.unloadShader(removeWorldShader);
				}
				if (format.world_ref != null) {
					RenderPath.active.loadShader("shader_datas/World_" + format.world_ref + "/World_" + format.world_ref);
				}
				#end
			});
		});
	}

	public function updateFrame() {
		if (!ready) return;
		#if lnx_stream
		sceneStream.update(active.camera);
		#end
		#if lnx_terrain
		if (terrainStream != null) terrainStream.update(active.camera);
		#end
		for (anim in animations) anim.update(Time.delta);
		for (e in empties) if (e != null && e.parent != null) e.transform.update();
	}

	public function renderFrame(g: kha.graphics4.Graphics) {
		if (!ready || RenderPath.active == null) return;
		framePassed = true;

		for (tilesheet in tilesheets) {
			tilesheet.update();
		}

		// Render probes
		#if rp_probes
		var activeCamera = camera;
		for (probe in probes) {
			camera = probe.camera;
			probe.render(g, activeCamera);
		}
		camera = activeCamera;
		#end

		// Render active camera
		camera != null ? camera.renderFrame(g) : RenderPath.active.renderFrame(g);
	}

	// Objects
	public function addObject(parent: Object = null): Object {
		var object = new Object();
		parent != null ? object.setParent(parent) : object.setParent(root);
		return object;
	}

	/**
	 * Returns the children of the scene.
	 *
	 * If 'recursive' is set to `false`, only direct children will be included
	 * in the returned array. If `recursive` is `true`, children of children and
	 * so on will be included too.
	 *
	 * @param recursive = `false` Include children of children
	 * @return `Array<Object>`
	 */
	public function getChildren(?recursive = false): Array<Object> {
		return root.getChildren(recursive);
	}

	public function getChild(name: String): Object {
		return root.getChild(name);
	}

	public function getTrait(c: Class<Trait>): Dynamic {
		return root.children.length > 0 ? root.children[0].getTrait(c) : null;
	}

	public function getMesh(name: String): MeshObject {
		for (m in meshes) if (m.name == name) return m;
		return null;
	}

	public function getLight(name: String): LightObject {
		for (l in lights) if (l.name == name) return l;
		return null;
	}

	public function getCamera(name: String): CameraObject {
		for (c in cameras) if (c.name == name) return c;
		return null;
	}

	#if lnx_audio
	public function getSpeaker(name: String): SpeakerObject {
		for (s in speakers) if (s.name == name) return s;
		return null;
	}
	#end

	public function getEmpty(name: String): Object {
		for (e in empties) if (e.name == name) return e;
		return null;
	}

	public function getGroup(name: String): Array<Object> {
		if (groups == null) groups = new Map();
		var g = groups.get(name);
		if (g == null) {
			g = [];
			groups.set(name, g);
			var refs = getGroupObjectRefs(name, active.raw);
			if (refs == null) return g;
			for (ref in refs) {
				var c = getChild(ref);
				if (c != null) g.push(c);
			}
		}
		return g;
	}

	public function addMeshObject(data: MeshData, materials: Vector<MaterialData>, parent: Object = null): MeshObject {
		var object = new MeshObject(data, materials);
		parent != null ? object.setParent(parent) : object.setParent(root);
		return object;
	}

	public function addLightObject(data: LightData, parent: Object = null): LightObject {
		var object = new LightObject(data);
		parent != null ? object.setParent(parent) : object.setParent(root);
		return object;
	}

	#if rp_probes
	public function addProbeObject(data: ProbeData, parent: Object = null): ProbeObject {
		var object = new ProbeObject(data);
		parent != null ? object.setParent(parent) : object.setParent(root);
		return object;
	}
	#end

	public function addCameraObject(data: CameraData, parent: Object = null): CameraObject {
		var object = new CameraObject(data);
		parent != null ? object.setParent(parent) : object.setParent(root);
		return object;
	}

	#if lnx_audio
	public function addSpeakerObject(data: TSpeakerData, parent: Object = null): SpeakerObject {
		var object = new SpeakerObject(data);
		parent != null ? object.setParent(parent) : object.setParent(root);
		return object;
	}
	#end

	#if rp_decals
	public function addDecalObject(material: MaterialData, parent: Object = null): DecalObject {
		var object = new DecalObject(material);
		parent != null ? object.setParent(parent) : object.setParent(root);
		return object;
	}
	#end

	#if lnx_stream
	var objectsTraversed = 0;
	#end
	public function addScene(sceneName: String, parent: Object, done: Object->Void) {
		if (parent == null) {
			parent = addObject();
			parent.name = sceneName;
		}
		Data.getSceneRaw(sceneName, function(format: TSceneFormat) {
			loadEmbeddedData(format.embedded_datas, function() { // Additional scene assets
				#if lnx_stream
				objectsTraversed = 0;
				#else
				var objectsTraversed = 0;
				#end

				var objectsCount = getObjectsCount(format.objects);
				function traverseObjects(parent: Object, objects: Array<TObj>, parentObject: TObj, done: Void->Void) {
					if (objects == null) return;
					for (i in 0...objects.length) {
						var o = objects[i];
						if (o.spawn != null && o.spawn == false) {
							if (++objectsTraversed == objectsCount) done();
							continue; // Do not auto-create this object
						}

						createObject(o, format, parent, parentObject, function(object: Object) {
							traverseObjects(object, o.children, o, done);
							if (++objectsTraversed == objectsCount) done();
						});
					}
				}

				if (format.objects == null || format.objects.length == 0) {
					createTraits(format.traits, parent); // Scene traits
					done(parent);
				}
				else {
					traverseObjects(parent, format.objects, null, function() { // Scene objects
						createTraits(format.traits, parent); // Scene traits
						done(parent);
					});
				}
			});
		});
	}

	function getObjectsCount(objects: Array<TObj>, discardNoSpawn = true): Int {
		if (objects == null) return 0;
		var result = objects.length;
		for (o in objects) {
			if (discardNoSpawn && o.spawn != null && o.spawn == false) continue; // Do not count children of non-spawned objects
			if (o.children != null) result += getObjectsCount(o.children);
		}
		return result;
	}

	/**
		Spawn a new object instance in the scene.
		@param	name The name of the object as defined in Blender.
		@param	parent The parent object this new object should be attached to (optional, use `null` to add to the scene without a parent).
		@param	done Function to run after the spawn is completed (optional). Useful to change properties of the object after spawning.
		@param	spawnChildren Also spawn the children of the newly spawned object (optional, default is `true`).
		@param	srcRaw If not `null`, spawn the object from the given scene data instead of using the scene this function is called on. Useful to spawn objects from other scenes.
	**/
	public function spawnObject(name: String, parent: Null<Object>, done: Null<Object->Void>, spawnChildren = true, srcRaw: Null<TSceneFormat> = null) {
		if (srcRaw == null) srcRaw = raw;
		var objectsTraversed = 0;
		var obj = getRawObjectByName(srcRaw, name);
		var objectsCount = spawnChildren ? getObjectsCount([obj], false) : 1;
		var rootId = -1;
		function spawnObjectTree(obj: TObj, parent: Object, parentObject: TObj, done: Object->Void) {
			createObject(obj, srcRaw, parent, parentObject, function(object: Object) {
				if (rootId == -1) {
					rootId = object.uid;
				}
				if (spawnChildren && obj.children != null) {
					for (child in obj.children) spawnObjectTree(child, object, obj, done);
				}
				if (++objectsTraversed == objectsCount && done != null) {
					// Retrieve the originally spawned object from the current
					// child object to ensure done() is called with the right
					// object
					while (object.uid != rootId) {
						object = object.parent;
					}
					done(object);
				}
			});
		}
		spawnObjectTree(obj, parent, null, done);
	}

	public function parseObject(sceneName: String, objectName: String, parent: Object, done: Object->Void) {
		Data.getSceneRaw(sceneName, function(format: TSceneFormat) {
			var o: TObj = getRawObjectByName(format, objectName);
			if (o == null) done(null);
			createObject(o, format, parent, null, done);
		});
	}

	/**
		Returns an object in scene data format ('TObj') based on its name.
		Returns 'null' if the object does not exist.
		@param format The raw scene data
		@param name The name of the object
		@return TObj
	**/
	public static function getRawObjectByName(format: TSceneFormat, name: String): TObj {
		return traverseObjs(format.objects, name);
	}

	/**
		Searches the given 'TObj' array for an object with the given name and returns that object.
		@param children The array in which to search
		@param name The name of the object
		@return TObj
	**/
	static function traverseObjs(children: Array<TObj>, name: String): TObj {
		for (o in children) {
			if (o.name == name) return o;
			if (o.children != null) {
				var res = traverseObjs(o.children, name);
				if (res != null) return res;
			}
		}
		return null;
	}

	public function createObject(o: TObj, format: TSceneFormat, parent: Object, parentObject: TObj, done: Object->Void) {
		var sceneName = format.name;

		if (o.type == "camera_object") {
			Data.getCamera(sceneName, o.data_ref, function(b: CameraData) {
				var object = addCameraObject(b, parent);
				returnObject(object, o, done);
			});
		}
		else if (o.type == "light_object") {
			Data.getLight(sceneName, o.data_ref, function(b: LightData) {
				var object = addLightObject(b, parent);
				returnObject(object, o, done);
			});
		}
		#if rp_probes
		else if (o.type == "probe_object") {
			Data.getProbe(sceneName, o.data_ref, function(b: ProbeData) {
				var object = addProbeObject(b, parent);
				returnObject(object, o, done);
			});
		}
		#end
		else if (o.type == "mesh_object") {
			if (o.material_refs == null || o.material_refs.length == 0) {
				createMeshObject(o, format, parent, parentObject, null, done);
			}
			else {
				// Materials
				var materials = new Vector<MaterialData>(o.material_refs.length);
				var materialsLoaded = 0;
				for (i in 0...o.material_refs.length) {
					var ref = o.material_refs[i];
					Data.getMaterial(sceneName, ref, function(mat: MaterialData) {
						materials[i] = mat;
						materialsLoaded++;
						if (materialsLoaded == o.material_refs.length) {
							createMeshObject(o, format, parent, parentObject, materials, done);
						}
					});
				}
			}
		}
		#if lnx_audio
		else if (o.type == "speaker_object") {
			var object = addSpeakerObject(Data.getSpeakerRawByName(format.speaker_datas, o.data_ref), parent);
			returnObject(object, o, done);
		}
		#end
		#if rp_decals
		else if (o.type == "decal_object") {
			if (o.material_refs != null && o.material_refs.length > 0) {
				Data.getMaterial(sceneName, o.material_refs[0], function(material: MaterialData) {
					var object = addDecalObject(material, parent);
					returnObject(object, o, done);
				});
			}
			else {
				var object = addDecalObject(null, parent);
				returnObject(object, o, done);
			}
		}
		#end
		else if (o.type == "object") {
			var object = addObject(parent);
			returnObject(object, o, function(ro: Object) {
				if (o.group_ref != null) { // Instantiate group objects
					spawnGroup(format, o.group_ref, ro, () -> done(ro), () -> done(ro) /* also call done when failed to ensure loading progress */);
				}
				else done(ro);
			});
		}
		else done(null);
	}

	function spawnGroup(format: TSceneFormat, groupRef: String, groupOwner: Object, done: Void->Void, ?failed: Void->Void) {
		var spawned = 0;
		var object_refs = getGroupObjectRefs(groupRef, format);

		if (object_refs == null) { // Group doesn't exist
			trace('Failed to spawn group "$groupRef", group doesn\'t exist');
			if (failed != null) failed();
		}
		else if (object_refs.length == 0) {
			done();
		}
		else {
			for (object_ref in object_refs) {
				// Spawn top-level collection objects and their children
				spawnObject(object_ref, groupOwner, function(spawnedObject: Object) {
					// Apply collection/group instance offset to all
					// top-level parents of that group
					if (!isObjectInGroup(groupRef, spawnedObject.parent, format)) {
						for (group in format.groups) {
							if (group.name == groupRef) {
								spawnedObject.transform.applyParent();
								spawnedObject.transform.translate(
									-group.instance_offset[0],
									-group.instance_offset[1],
									-group.instance_offset[2]
								);
								break;
							}
						}
					}
					if (++spawned == object_refs.length) {
						groupOwner.transform.reset();
						done();
					}
				}, true, format);
			}
		}
	}

	/**
		Returns all object names of the given group.
		Returns `null` if the group does not exist.
		@param group_ref The name of the group
		@param format The raw scene data
		@return `Array<String>`
	**/
	function getGroupObjectRefs(group_ref: String, format: TSceneFormat): Array<String> {
		for (g in format.groups) if (g.name == group_ref) return g.object_refs;
		return null;
	}

	/**
		Returns all objects in scene data format (`TObj`) of the given group.
		If the group does not exist or is empty, an empty array is returned.
		@param groupRef The name of the group
		@param format The raw scene data
		@return `Array<TObj>`
	**/
	function getGroupObjectsRaw(groupRef: String, format: TSceneFormat): Array<TObj> {
		var objectRefs = getGroupObjectRefs(groupRef, format);
		var objects: Array<TObj> = new Array<TObj>();

		if (objectRefs == null) return objects;

		for (objRef in objectRefs) {
			var rawObj = getRawObjectByName(format, objRef);
			objects.push(rawObj);

			var childRefs = getChildObjectsRaw(rawObj);
			objects = objects.concat(childRefs);
		}
		return objects;
	}

	/**
		Returns all child objects of the given raw object in scene data format ('TObj').
		If the object has no children, an empty array is returned.
		@param rawObj The object
		@param recursive (Optional) If 'true', return also children of children and so on...
		@return `Array<TObj>`
	**/
	function getChildObjectsRaw(rawObj: TObj, ?recursive:Bool = true): Array<TObj> {
		var children = rawObj.children;
		if (children == null) return new Array<TObj>();
		children = children.copy();

		if (recursive) {
			for (child in rawObj.children) {
				var childRefs = getChildObjectsRaw(child);
				children = children.concat(childRefs);
			}
		}
		return children;
	}

	/**
		Checks if an object is an element of the given group.
		@param groupRef The name of the group
		@param object The object
		@param format The raw scene data
		@return Bool
	**/
	function isObjectInGroup(groupRef: String, object: Object, format: TSceneFormat): Bool {
		for (obj in getGroupObjectsRaw(groupRef, format)) {
			if (obj.name == object.name) {
				return true;
			}
		}
		return false;
	}

#if lnx_stream
	function childCount(o: TObj): Int {
		var i = o.children.length;
		if (o.children != null) for (c in o.children) i += childCount(c);
		return i;
	}

	function streamMeshObject(object_file: String, data_ref: String, sceneName: String, armature: Armature, materials: Vector<MaterialData>, parent: Object, parentObj: TObj, o: TObj, done: Object->Void) {
		sceneStream.add(object_file, data_ref, sceneName, armature, materials, parent, parentObj, o);
		returnObject(null, null, done);
	}
#end

	function isLod(raw: TObj): Bool {
		return raw != null && raw.lods != null && raw.lods.length > 0;
	}

	function createMeshObject(o: TObj, format: TSceneFormat, parent: Object, parentObject: TObj, materials: Vector<MaterialData>, done: Object->Void) {
		// Mesh reference
		var ref = o.data_ref.split("/");
		var object_file = "";
		var data_ref = "";
		var sceneName = format.name;
		if (ref.length == 2) { // File reference
			object_file = ref[0];
			data_ref = ref[1];
		}
		else { // Local mesh data
			object_file = sceneName;
			data_ref = o.data_ref;
		}

		// Bone objects are stored in armature parent
		#if lnx_skin
		if (parentObject != null && parentObject.bone_actions != null) {
			var bactions: Array<TSceneFormat> = [];
			for (ref in parentObject.bone_actions) {
				Data.getSceneRaw(ref, function(action: TSceneFormat) {
					bactions.push(action);
					if (bactions.length == parentObject.bone_actions.length) {
						var armature: Armature = null;
						// Check if armature exists
						for (a in armatures) {
							if (a.uid == parent.uid) {
								armature = a;
								break;
							}
						}
						// Create new one
						if (armature == null) {
							armature = new Armature(parent.uid, parent.name, bactions);
							armatures.push(armature);
						}
						#if lnx_stream
						streamMeshObject(
						#else
						returnMeshObject(
						#end
							object_file, data_ref, sceneName, armature, materials, parent, parentObject, o, done);
					}
				});
			}
		}
		else { #end // lnx_skin
			#if lnx_stream
			streamMeshObject(
			#else
			returnMeshObject(
			#end
				object_file, data_ref, sceneName, null, materials, parent, parentObject, o, done);
		#if lnx_skin
		}
		#end
	}

	public function returnMeshObject(object_file: String, data_ref: String, sceneName: String, armature: #if lnx_skin Armature #else Null<Int> #end, materials: Vector<MaterialData>, parent: Object, parentObject: TObj, o: TObj, done: Object->Void) {
		Data.getMesh(object_file, data_ref, function(mesh: MeshData) {
			var object = addMeshObject(mesh, materials, parent);
			#if lnx_batch
			var lod = isLod(o) || (parent != null && isLod(parent.raw));
			object.batch(lod);
			#end

			// Attach particle systems
			#if lnx_particles
			if (o.particle_refs != null) {
				cast(object, MeshObject).render_emitter = o.render_emitter;
				for (ref in o.particle_refs) cast(object, MeshObject).setupParticleSystem(sceneName, ref);
			}
			#end
			// Attach tilesheet
			if (o.tilesheet_ref != null) {
				cast(object, MeshObject).setupTilesheet(sceneName, o.tilesheet_ref, o.tilesheet_action_ref);
			}
			
			if (o.camera_list != null){
				cast(object, MeshObject).cameraList = o.camera_list;
			}

			returnObject(object, o, done);
		});
	}

	function returnObject(object: Object, o: TObj, done: Object->Void) {
		// Load object actions
		if (object != null && o.object_actions != null) {
			var oactions: Array<TSceneFormat> = [];
			while (oactions.length < o.object_actions.length) oactions.push(null);
			var actionsLoaded = 0;
			for (i in 0...o.object_actions.length) {
				var ref = o.object_actions[i];
				if (ref == "null") { // No startup action set
					actionsLoaded++;
					continue;
				}
				Data.getSceneRaw(ref, function(action: TSceneFormat) {
					oactions[i] = action;
					actionsLoaded++;
					if (actionsLoaded == o.object_actions.length) {
						returnObjectLoaded(object, o, oactions, done);
					}
				});
			}
		}
		else returnObjectLoaded(object, o, null, done);
	}

	function returnObjectLoaded(object: Object, o: TObj, oactions: Array<TSceneFormat>, done: Object->Void) {
		if (object != null) {
			object.raw = o;
			object.name = o.name;
			if (o.visible != null) object.visible = o.visible;
			if (o.visible_mesh != null) object.visibleMesh = o.visible_mesh;
			if (o.visible_shadow != null) object.visibleShadow = o.visible_shadow;
			createConstraints(o.constraints, object);
			generateTransform(o, object.transform);
			object.setupAnimation(oactions);
			#if lnx_morph_target
			object.setupMorphTargets();
			#end
			if (o.properties != null) {
				object.properties = new Map();
				for (p in o.properties) object.properties.set(p.name, p.value);
			}

			if (o.vertex_groups != null) {
				object.vertex_groups = new Map();
				for (p in o.vertex_groups){
					var verts = [];
					for(i in 0...Std.int(p.value.length/3)){
						var x = Std.parseFloat(p.value[i*3]);
						var y = Std.parseFloat(p.value[i*3+1]);
						var z = Std.parseFloat(p.value[i*3+2]);
						verts.push(new iron.math.Vec4(x, y, z, 1));
					}
					object.vertex_groups.set(p.name, verts);
				}
			}

			// If the scene is still initializing, traits will be created later
			// to ensure that object references for trait properties are valid
			if (!active.initializing) createTraits(o.traits, object);
		}
		done(object);
	}

	static function generateTransform(object: TObj, transform: Transform) {
		transform.world = object.transform != null ? iron.math.Mat4.fromFloat32Array(object.transform.values) : iron.math.Mat4.identity();
		transform.world.decompose(transform.loc, transform.rot, transform.scale);
		// Whether to apply parent matrix
		if (object.local_only != null) transform.localOnly = object.local_only;
		if (transform.object.parent != null) transform.update();
	}

	static function createTraits(traits: Array<TTrait>, object: Object) {
		if (traits == null) return;
		for (t in traits) {
			if (t.type == "Script") {
				// Assign arguments if any
				var args: Array<Dynamic> = [];
				if (t.parameters != null) {
					for (param in t.parameters) {
						args.push(parseArg(param));
					}
				}
				var traitInst = createTraitClassInstance(t.class_name, args);
				if (traitInst == null) {
					trace("Error: Trait '" + t.class_name + "' referenced in object '" + object.name + "' not found");
					continue;
				}

				// Set trait properties
				if (t.props != null) {
					for (i in 0...Std.int(t.props.length / 3)) {
						var pname: String = t.props[i * 3];
						var ptype: String = t.props[i * 3 + 1];
						var pval: Dynamic = t.props[i * 3 + 2];

						if (StringTools.endsWith(ptype, "Object") && pval != "") {
							Reflect.setProperty(traitInst, pname, Scene.active.getChild(pval));
						}
						else {
							switch (ptype) {
								case "Vec2":
									final pVec: kha.arrays.Float32Array = cast pval;
									Reflect.setProperty(traitInst, pname, new iron.math.Vec2(pVec[0], pVec[1]));
								case "Vec3":
									final pVec: kha.arrays.Float32Array = cast pval;
									Reflect.setProperty(traitInst, pname, new iron.math.Vec3(pVec[0], pVec[1], pVec[2]));
								case "Vec4":
									final pVec: kha.arrays.Float32Array = cast pval;
									Reflect.setProperty(traitInst, pname, new iron.math.Vec4(pVec[0], pVec[1], pVec[2], pVec[3]));
								default:
									Reflect.setProperty(traitInst, pname, pval);
							}
						}
					}
				}
				object.addTrait(traitInst);
			}
		}
	}

 	static function parseArg(str: String): Dynamic {
		if (str == "true") return true;
		else if (str == "false") return false;
		else if (str == "null") return null;
		else if (str.charAt(0) == "'") return str.replace("'", "");
		else if (str.charAt(0) == '"') return str.replace('"', "");
		else if (str.charAt(0) == "[") { // Array
			// Remove [] and recursively parse into array, then append into parent
			str = str.replace("[", "");
			str = str.replace("]", "");
			str = str.replace(" ", "");
			var ar: Dynamic = [];
			var vals = str.split(",");
			for (v in vals) ar.push(parseArg(v));
			return ar;
		}
		else if (str.charAt(0) == '{') { // Typedef or anonymous structure
			return haxe.Json.parse(str);
		}
		else {
			var f = Std.parseFloat(str);
			var i = Std.parseInt(str);
			return f == i ? i : f;
		}
	}

	static function createConstraints(constraints: Array<TConstraint>, object: Object) {
		if (constraints == null) return;
		object.constraints = [];
		for (c in constraints) {
			var constr = new Constraint(c);
			object.constraints.push(constr);
		}
	}

	static function createTraitClassInstance(traitName: String, args: Array<Dynamic>): Dynamic {
		var cname = Type.resolveClass(traitName);
		if (cname == null) return null;
		return Type.createInstance(cname, args);
	}

	function loadEmbeddedData(datas: Array<String>, done: Void->Void) {
		if (datas == null) {
			done();
			return;
		}
		var loaded = 0;
		for (file in datas) {
			embedData(file, function() {
				loaded++;
				if (loaded == datas.length) done();
			});
		}
	}

	public function embedData(file: String, done: Void->Void) {
		if (file.endsWith(".raw")) {
			Data.getBlob(file, function(blob: kha.Blob) {
				// Raw 3D texture bytes
				var b = blob.toBytes();
				var w = Std.int(Math.pow(b.length, 1 / 3)) + 1;
				var image = kha.Image.fromBytes3D(b, w, w, w, TextureFormat.L8);
				embedded.set(file, image);
				done();
			});
		}
		else {
			Data.getImage(file, function(image: kha.Image) {
				embedded.set(file, image);
				done();
			});
		}
	}

	// Hooks
	public function notifyOnInit(f: Void->Void) {
		if (ready) f(); // Scene already running
		else traitInits.push(f);
	}

	public function removeInit(f: Void->Void) {
		traitInits.remove(f);
	}

	public function notifyOnRemove(f: Void->Void) {
		traitRemoves.push(f);
	}
}