@xeokit/xeokit-sdk
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3D BIM IFC Viewer SDK for AEC engineering applications. Open Source JavaScript Toolkit based on pure WebGL for top performance, real-world coordinates and full double precision
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JavaScript
import {Plugin, SceneModel, utils} from "../../viewer/index.js"
import {GLTFSceneModelLoader} from "./GLTFSceneModelLoader.js";
import {GLTFDefaultDataSource} from "./GLTFDefaultDataSource.js";
import {IFCObjectDefaults} from "../../viewer/metadata/IFCObjectDefaults.js";
/**
* {@link Viewer} plugin that loads models from [glTF](https://www.khronos.org/gltf/).
*
* * Loads all glTF formats, including embedded and binary formats.
* * Loads physically-based materials and textures.
* * Creates an {@link Entity} representing each model it loads, which will have {@link Entity#isModel} set ````true```` and will be registered by {@link Entity#id} in {@link Scene#models}.
* * Creates an {@link Entity} for each object within the model, which is indicated by each glTF ````node```` that has a ````name```` attribute. Those Entities will have {@link Entity#isObject} set ````true```` and will be registered by {@link Entity#id} in {@link Scene#objects}.
* * When loading, can set the World-space position, scale and rotation of each model within World space, along with initial properties for all the model's {@link Entity}s.
* * Not recommended for large models. For best performance with large glTF datasets, we recommend first converting them
* to ````.xkt```` format (e.g. using [convert2xkt](https://github.com/xeokit/xeokit-convert)), then loading
* the ````.xkt```` using {@link XKTLoaderPlugin}.
*
* ## Metadata
*
* GLTFLoaderPlugin can also load an accompanying JSON metadata file with each model, which creates a {@link MetaModel} corresponding
* to the model {@link Entity} and a {@link MetaObject} corresponding to each object {@link Entity}.
*
* Each {@link MetaObject} has a {@link MetaObject#type}, which indicates the classification of its corresponding {@link Entity}. When loading
* metadata, we can also provide GLTFLoaderPlugin with a custom lookup table of initial values to set on the properties of each type of {@link Entity}. By default, GLTFLoaderPlugin
* uses its own map of default colors and visibilities for IFC element types.
*
* ## Usage
*
* In the example below we'll load a house plan model from a [binary glTF file](/examples/models/gltf/schependomlaan/), along
* with an accompanying JSON [IFC metadata file](/examples/metaModels/schependomlaan/).
*
* This will create a bunch of {@link Entity}s that represents the model and its objects, along with a {@link MetaModel} and {@link MetaObject}s
* that hold their metadata.
*
* Since this model contains IFC types, the GLTFLoaderPlugin will set the initial colors of object {@link Entity}s according
* to the standard IFC element colors in the GLTFModel's current map. Override that with your own map via property {@link GLTFLoaderPlugin#objectDefaults}.
*
* ````javascript
* import {Viewer, GLTFLoaderPlugin} from "xeokit-sdk.es.js";
*
* //------------------------------------------------------------------------------------------------------------------
* // 1. Create a Viewer,
* // 2. Arrange the camera,
* // 3. Tweak the selection material (tone it down a bit)
* //------------------------------------------------------------------------------------------------------------------
*
* // 1
* const viewer = new Viewer({
* canvasId: "myCanvas",
* transparent: true
* });
*
* // 2
* viewer.camera.orbitPitch(20);
* viewer.camera.orbitYaw(-45);
*
* // 3
* viewer.scene.selectedMaterial.fillAlpha = 0.1;
*
* //------------------------------------------------------------------------------------------------------------------
* // 1. Create a glTF loader plugin,
* // 2. Load a glTF building model and JSON IFC metadata
* // 3. Emphasis the edges to make it look nice
* //------------------------------------------------------------------------------------------------------------------
*
* // 1
* const gltfLoader = new GLTFLoaderPlugin(viewer);
*
* // 2
* var model = gltfLoader.load({ // Returns an Entity that represents the model
* id: "myModel",
* src: "./models/gltf/OTCConferenceCenter/scene.gltf",
* metaModelSrc: "./models/gltf/OTCConferenceCenter/metaModel.json", // Creates a MetaModel (see below)
* edges: true
* });
*
* model.on("loaded", () => {
*
* //--------------------------------------------------------------------------------------------------------------
* // 1. Find metadata on the third storey
* // 2. Select all the objects in the building's third storey
* // 3. Fit the camera to all the objects on the third storey
* //--------------------------------------------------------------------------------------------------------------
*
* // 1
* const metaModel = viewer.metaScene.metaModels["myModel"]; // MetaModel with ID "myModel"
* const metaObject
* = viewer.metaScene.metaObjects["0u4wgLe6n0ABVaiXyikbkA"]; // MetaObject with ID "0u4wgLe6n0ABVaiXyikbkA"
*
* const name = metaObject.name; // "01 eerste verdieping"
* const type = metaObject.type; // "IfcBuildingStorey"
* const parent = metaObject.parent; // MetaObject with type "IfcBuilding"
* const children = metaObject.children; // Array of child MetaObjects
* const objectId = metaObject.id; // "0u4wgLe6n0ABVaiXyikbkA"
* const objectIds = viewer.metaScene.getObjectIDsInSubtree(objectId); // IDs of leaf sub-objects
* const aabb = viewer.scene.getAABB(objectIds); // Axis-aligned boundary of the leaf sub-objects
*
* // 2
* viewer.scene.setObjectsSelected(objectIds, true);
*
* // 3
* viewer.cameraFlight.flyTo(aabb);
* });
*
* // Find the model Entity by ID
* model = viewer.scene.models["myModel"];
*
* // Destroy the model
* model.destroy();
* ````
*
* ## Transforming
*
* We have the option to rotate, scale and translate each *````.glTF````* model as we load it.
*
* This lets us load multiple models, or even multiple copies of the same model, and position them apart from each other.
*
* In the example below, we'll scale our model to half its size, rotate it 90 degrees about its local X-axis, then
* translate it 100 units along its X axis.
*
* ````javascript
* const model = gltfLoader.load({
* src: "./models/gltf/Duplex/scene.gltf",
* metaModelSrc: "./models/gltf/Duplex/Duplex.json",
* rotation: [90,0,0],
* scale: [0.5, 0.5, 0.5],
* position: [100, 0, 0]
* });
* ````
*
* ## Including and excluding IFC types
*
* We can also load only those objects that have the specified IFC types. In the example below, we'll load only the
* objects that represent walls.
*
* ````javascript
* const model = gltfLoader.load({
* id: "myModel",
* src: "./models/gltf/OTCConferenceCenter/scene.gltf",
* metaModelSrc: "./models/gltf/OTCConferenceCenter/metaModel.json",
* includeTypes: ["IfcWallStandardCase"]
* });
* ````
*
* We can also load only those objects that **don't** have the specified IFC types. In the example below, we'll load only the
* objects that do not represent empty space.
*
* ````javascript
* const model = gltfLoader.load({
* id: "myModel",
* src: "./models/gltf/OTCConferenceCenter/scene.gltf",
* metaModelSrc: "./models/gltf/OTCConferenceCenter/metaModel.json",
* excludeTypes: ["IfcSpace"]
* });
* ````
*
* ## Showing a glTF model in TreeViewPlugin when metadata is not available
*
* When GLTFLoaderPlugin loads a glTF model, it creates an object Entity for each `node` in the glTF `scene` hierarchy that has a
* `name` attribute, giving the Entity an ID that has the value of the `name` attribute.
*
* Those name attributes are created by converter tools, such as by [IFC2GLTFCxConverter](https://github.com/Creoox/creoox-ifc2gltfcxconverter) when it generates glTF from IFC files. However, those name attributes are not
* ordinarily present in glTF that comes from other sources, such as LiDAR scanners. For such glTF models, GLTFLoaderPlugin
* will create Entities, but they will have randomly-generated IDs, and therefore cannot be associated with MetaObjects in any
* MetaModels that we create alongside the model.
*
* For glTF models containing `nodes` that don't have `name` attributes, we can use the `load()` method's `elementId` parameter
* to make GLTFLoaderPlugin load the entire model into a single Entity that gets this ID.
*
* In conjunction with that parameter, we can then use the `load()` method's `metaModelJSON` parameter to create a MetaModel that
* contains a MetaObject that corresponds to that Entity.
*
* When we've done that, then xeokit's {@link TreeViewPlugin} is able to have a node that represents the glTF model and controls
* the visibility of that Entity (i.e. to control the visibility of the entire model).
*
* The snippet below shows how this is done.
*
* ````javascript
* import {Viewer, GLTFLoaderPlugin, NavCubePlugin, TreeViewPlugin} from "../../dist/xeokit-sdk.es.js";
*
* const viewer = new Viewer({
* canvasId: "myCanvas",
* transparent: true
* });
*
* new TreeViewPlugin(viewer, {
* containerElement: document.getElementById("treeViewContainer"),
* hierarchy: "containment"
* });
*
* const gltfLoader = new GLTFLoaderPlugin(viewer);
*
* const sceneModel = gltfLoader.load({ // Creates a SceneModel with ID "myScanModel"
* id: "myScanModel",
* src: "public-use-sample-apartment.glb",
*
* //-------------------------------------------------------------------------
* // Specify an `elementId` parameter, which causes the
* // entire model to be loaded into a single Entity that gets this ID.
* //-------------------------------------------------------------------------
*
* entityId: "3toKckUfH2jBmd$7uhJHa4", // Creates an Entity with this ID
*
* //-------------------------------------------------------------------------
* // Specify a `metaModelJSON` parameter, which creates a
* // MetaModel with two MetaObjects, one of which corresponds
* // to our Entity. Then the TreeViewPlugin is able to have a node
* // that can represent the model and control the visibility of the Entity.
* //--------------------------------------------------------------------------
*
* metaModelJSON: { // Creates a MetaModel with ID "myScanModel"
* "metaObjects": [
* {
* "id": "3toKckUfH2jBmd$7uhJHa6", // Creates a MetaObject with this ID
* "name": "My Project",
* "type": "Default",
* "parent": null
* },
* {
* "id": "3toKckUfH2jBmd$7uhJHa4", // Creates a MetaObject with this ID (same ID as our Entity)
* "name": "My Scan",
* "type": "Default",
* "parent": "3toKckUfH2jBmd$7uhJHa6"
* }
* ]
* }
* });
* ````
* @class GLTFLoaderPlugin
*/
class GLTFLoaderPlugin extends Plugin {
/**
* @constructor
*
* @param {Viewer} viewer The Viewer.
* @param {Object} cfg Plugin configuration.
* @param {String} [cfg.id="GLTFLoader"] Optional ID for this plugin, so that we can find it within {@link Viewer#plugins}.
* @param {Object} [cfg.objectDefaults] Map of initial default states for each loaded {@link Entity} that represents an object. Default value is {@link IFCObjectDefaults}.
* @param {Object} [cfg.dataSource] A custom data source through which the GLTFLoaderPlugin can load metadata, glTF and binary attachments. Defaults to an instance of {@link GLTFDefaultDataSource}, which loads over HTTP.
*/
constructor(viewer, cfg = {}) {
super("GLTFLoader", viewer, cfg);
this._sceneModelLoader = new GLTFSceneModelLoader(this, cfg);
this.dataSource = cfg.dataSource;
this.objectDefaults = cfg.objectDefaults;
}
/**
* Sets a custom data source through which the GLTFLoaderPlugin can load metadata, glTF and binary attachments.
*
* Default value is {@link GLTFDefaultDataSource}, which loads via an XMLHttpRequest.
*
* @type {Object}
*/
set dataSource(value) {
this._dataSource = value || new GLTFDefaultDataSource();
}
/**
* Gets the custom data source through which the GLTFLoaderPlugin can load metadata, glTF and binary attachments.
*
* Default value is {@link GLTFDefaultDataSource}, which loads via an XMLHttpRequest.
*
* @type {Object}
*/
get dataSource() {
return this._dataSource;
}
/**
* Sets map of initial default states for each loaded {@link Entity} that represents an object.
*
* Default value is {@link IFCObjectDefaults}.
*
* @type {{String: Object}}
*/
set objectDefaults(value) {
this._objectDefaults = value || IFCObjectDefaults;
}
/**
* Gets map of initial default states for each loaded {@link Entity} that represents an object.
*
* Default value is {@link IFCObjectDefaults}.
*
* @type {{String: Object}}
*/
get objectDefaults() {
return this._objectDefaults;
}
/**
* Loads a glTF model from a file into this GLTFLoaderPlugin's {@link Viewer}.
*
* @param {*} params Loading parameters.
* @param {String} [params.id] ID to assign to the root {@link Entity#id}, unique among all components in the Viewer's {@link Scene}, generated automatically by default.
* @param {String} [params.src] Path to a glTF file, as an alternative to the ````gltf```` parameter.
* @param {*} [params.gltf] glTF JSON, as an alternative to the ````src```` parameter.
* @param {String} [params.metaModelSrc] Path to an optional metadata file, as an alternative to the ````metaModelJSON```` parameter.
* @param {*} [params.metaModelJSON] JSON model metadata, as an alternative to the ````metaModelSrc```` parameter.
* @param {{String:Object}} [params.objectDefaults] Map of initial default states for each loaded {@link Entity} that represents an object. Default value is {@link IFCObjectDefaults}.
* @param {Boolean} [params.edges=false] Whether or not xeokit renders the model with edges emphasized.
* @param {Number[]} [params.origin=[0,0,0]] The double-precision World-space origin of the model's coordinates.
* @param {Number[]} [params.position=[0,0,0]] The single-precision position, relative to ````origin````.
* @param {Number[]} [params.scale=[1,1,1]] The model's scale.
* @param {Number[]} [params.rotation=[0,0,0]] The model's orientation, as Euler angles given in degrees, for each of the X, Y and Z axis.
* @param {Number[]} [params.matrix=[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1]] The model's world transform matrix. Overrides the position, scale and rotation parameters. Relative to ````origin````.
* @param {Boolean} [params.saoEnabled=true] Indicates if Scalable Ambient Obscurance (SAO) is enabled for the model. SAO is configured by the Scene's {@link SAO} component. Only works when {@link SAO#enabled} is also ````true````
* @param {Boolean} [params.pbrEnabled=true] Indicates if physically-based rendering (PBR) is enabled for the model. Overrides ````colorTextureEnabled````. Only works when {@link Scene#pbrEnabled} is also ````true````.
* @param {Boolean} [params.colorTextureEnabled=true] Indicates if base color texture rendering is enabled for the model. Overridden by ````pbrEnabled````. Only works when {@link Scene#colorTextureEnabled} is also ````true````.
* @param {Boolean} [params.backfaces=true] When true, always show backfaces, even on objects for which the glTF material is single-sided. When false, only show backfaces on geometries whenever the glTF material is double-sided.
* @param {Number} [params.edgeThreshold=10] When xraying, highlighting, selecting or edging, this is the threshold angle between normals of adjacent triangles, below which their shared wireframe edge is not drawn.
* @param {Boolean} [params.dtxEnabled=true] When ````true```` (default) use data textures (DTX), where appropriate, to
* represent the returned model. Set false to always use vertex buffer objects (VBOs). Note that DTX is only applicable
* to non-textured triangle meshes, and that VBOs are always used for meshes that have textures, line segments, or point
* primitives. Only works while {@link DTX#enabled} is also ````true````.
* @param {Boolean} [params.autoMetaModel] When supplied, creates a default MetaModel with a single MetaObject.
* @param {Boolean} [params.globalizeObjectIds=false] Indicates whether to globalize each {@link Entity#id} and {@link MetaObject#id}, in case you need to prevent ID clashes with other models.
* @param {*} [params.parseOptions={}] Options to pass to loaders.gl parse method, eg. ````{ gltf: { excludeExtensions: { "KHR_texture_transform": false } } }````.
* @param {Boolean} [params.entityPerMesh=false] Create an entity for each mesh, instead of grouping leaf meshes under their common entity.
* @returns {Entity} Entity representing the model, which will have {@link Entity#isModel} set ````true```` and will be registered by {@link Entity#id} in {@link Scene#models}
*/
load(params = {}) {
if (params.id && this.viewer.scene.components[params.id]) {
this.error("Component with this ID already exists in viewer: " + params.id + " - will autogenerate this ID");
delete params.id;
}
const sceneModel = new SceneModel(this.viewer.scene, utils.apply(params, {
isModel: true,
dtxEnabled: params.dtxEnabled
}));
const modelId = sceneModel.id; // In case ID was auto-generated
if (!params.src && !params.gltf) {
this.error("load() param expected: src or gltf");
return sceneModel; // Return new empty model
}
if (params.metaModelSrc || params.metaModelJSON) {
const processMetaModelJSON = (metaModelJSON) => {
this.viewer.metaScene.createMetaModel(modelId, metaModelJSON, {});
this.viewer.scene.canvas.spinner.processes--;
if (params.src) {
this._sceneModelLoader.load(this, params.src, metaModelJSON, params, sceneModel);
} else {
this._sceneModelLoader.parse(this, params.gltf, metaModelJSON, params, sceneModel);
}
};
if (params.metaModelSrc) {
const metaModelSrc = params.metaModelSrc;
this.viewer.scene.canvas.spinner.processes++;
this._dataSource.getMetaModel(metaModelSrc, (metaModelJSON) => {
this.viewer.scene.canvas.spinner.processes--;
processMetaModelJSON(metaModelJSON);
}, (errMsg) => {
this.error(`load(): Failed to load model metadata for model '${modelId} from '${metaModelSrc}' - ${errMsg}`);
this.viewer.scene.canvas.spinner.processes--;
});
} else if (params.metaModelJSON) {
processMetaModelJSON(params.metaModelJSON);
}
} else {
if (params.src) {
this._sceneModelLoader.load(this, params.src, null, params, sceneModel);
} else {
this._sceneModelLoader.parse(this, params.gltf, null, params, sceneModel);
}
}
sceneModel.once("destroyed", () => {
this.viewer.metaScene.destroyMetaModel(modelId);
});
return sceneModel;
}
/**
* Destroys this GLTFLoaderPlugin.
*/
destroy() {
super.destroy();
}
}
export {GLTFLoaderPlugin}