Babylon.js/src/Helpers/babylon.sceneHelpers.ts

module BABYLON {
    export interface Scene {
        /**
         * Creates a default light for the scene.
         * @see http://doc.babylonjs.com/How_To/Fast_Build#create-default-light
         * @param replace has the default false, when true replaces the existing lights in the scene with a hemispheric light
         */
        createDefaultLight(replace?: boolean): void;

        /**
         * Creates a default camera for the scene.
         * @see http://doc.babylonjs.com/How_To/Fast_Build#create-default-camera
         * @param createArcRotateCamera has the default false which creates a free camera, when true creates an arc rotate camera
         * @param replace has default false, when true replaces the active camera in the scene
         * @param attachCameraControls has default false, when true attaches camera controls to the canvas.
         */
        createDefaultCamera(createArcRotateCamera?: boolean, replace?: boolean, attachCameraControls?: boolean): void;

        /**
         * Creates a default camera and a default light.
         * @see http://doc.babylonjs.com/how_to/Fast_Build#create-default-camera-or-light
         * @param createArcRotateCamera has the default false which creates a free camera, when true creates an arc rotate camera
         * @param replace has the default false, when true replaces the active camera/light in the scene
         * @param attachCameraControls has the default false, when true attaches camera controls to the canvas.
         */
        createDefaultCameraOrLight(createArcRotateCamera?: boolean, replace?: boolean, attachCameraControls?: boolean): void;

        /**
         * Creates a new sky box
         * @see http://doc.babylonjs.com/how_to/Fast_Build#create-default-skybox
         * @param environmentTexture defines the texture to use as environment texture
         * @param pbr has default false which requires the StandardMaterial to be used, when true PBRMaterial must be used
         * @param scale defines the overall scale of the skybox
         * @param blur is only available when pbr is true, default is 0, no blur, maximum value is 1
         * @param setGlobalEnvTexture has default true indicating that scene.environmentTexture must match the current skybox texture
         * @returns a new mesh holding the sky box
         */
        createDefaultSkybox(environmentTexture?: BaseTexture, pbr?: boolean, scale?: number, blur?: number, setGlobalEnvTexture?: boolean): Nullable<Mesh>;

        /**
         * Creates a new environment
         * @see http://doc.babylonjs.com/How_To/Fast_Build#create-default-environment
         * @param options defines the options you can use to configure the environment
         * @returns the new EnvironmentHelper
         */
        createDefaultEnvironment(options?: Partial<IEnvironmentHelperOptions>): Nullable<EnvironmentHelper>;

        /**
         * Creates a new VREXperienceHelper
         * @see http://doc.babylonjs.com/how_to/webvr_helper
         * @param webVROptions defines the options used to create the new VREXperienceHelper
         * @returns a new VREXperienceHelper
         */
        createDefaultVRExperience(webVROptions?: VRExperienceHelperOptions): VRExperienceHelper;

        /**
         * Creates a new XREXperienceHelper
         * @see http://doc.babylonjs.com/how_to/webxr
         * @returns a promise for a new XREXperienceHelper
         */
        createDefaultXRExperienceAsync(): Promise<WebXRExperienceHelper>;
    }

    Scene.prototype.createDefaultLight = function(replace = false): void {
        // Dispose existing light in replace mode.
        if (replace) {
            if (this.lights) {
                for (var i = 0; i < this.lights.length; i++) {
                    this.lights[i].dispose();
                }
            }
        }

        // Light
        if (this.lights.length === 0) {
            new HemisphericLight("default light", Vector3.Up(), this);
        }
    };

    Scene.prototype.createDefaultCamera = function(createArcRotateCamera = false, replace = false, attachCameraControls = false): void {
        // Dispose existing camera in replace mode.
        if (replace) {
            if (this.activeCamera) {
                this.activeCamera.dispose();
                this.activeCamera = null;
            }
        }

        // Camera
        if (!this.activeCamera) {
            var worldExtends = this.getWorldExtends();
            var worldSize = worldExtends.max.subtract(worldExtends.min);
            var worldCenter = worldExtends.min.add(worldSize.scale(0.5));

            var camera: TargetCamera;
            var radius = worldSize.length() * 1.5;
            // empty scene scenario!
            if (!isFinite(radius)) {
                radius = 1;
                worldCenter.copyFromFloats(0, 0, 0);
            }
            if (createArcRotateCamera) {
                var arcRotateCamera = new ArcRotateCamera("default camera", -(Math.PI / 2), Math.PI / 2, radius, worldCenter, this);
                arcRotateCamera.lowerRadiusLimit = radius * 0.01;
                arcRotateCamera.wheelPrecision = 100 / radius;
                camera = arcRotateCamera;
            }
            else {
                var freeCamera = new FreeCamera("default camera", new Vector3(worldCenter.x, worldCenter.y, -radius), this);
                freeCamera.setTarget(worldCenter);
                camera = freeCamera;
            }
            camera.minZ = radius * 0.01;
            camera.maxZ = radius * 1000;
            camera.speed = radius * 0.2;
            this.activeCamera = camera;

            let canvas = this.getEngine().getRenderingCanvas();
            if (attachCameraControls && canvas) {
                camera.attachControl(canvas);
            }
        }
    };

    Scene.prototype.createDefaultCameraOrLight = function(createArcRotateCamera = false, replace = false, attachCameraControls = false): void {
        this.createDefaultLight(replace);
        this.createDefaultCamera(createArcRotateCamera, replace, attachCameraControls);
    };

    Scene.prototype.createDefaultSkybox = function(environmentTexture?: BaseTexture, pbr = false, scale = 1000, blur = 0, setGlobalEnvTexture = true): Nullable<Mesh> {

        if (!environmentTexture) {
            Tools.Warn("Can not create default skybox without environment texture.");
            return null;
        }

        if (setGlobalEnvTexture) {
            if (environmentTexture) {
                this.environmentTexture = environmentTexture;
            }
        }

        // Skybox
        var hdrSkybox = Mesh.CreateBox("hdrSkyBox", scale, this);
        if (pbr) {
            let hdrSkyboxMaterial = new PBRMaterial("skyBox", this);
            hdrSkyboxMaterial.backFaceCulling = false;
            hdrSkyboxMaterial.reflectionTexture = environmentTexture.clone();
            if (hdrSkyboxMaterial.reflectionTexture) {
                hdrSkyboxMaterial.reflectionTexture.coordinatesMode = Texture.SKYBOX_MODE;
            }
            hdrSkyboxMaterial.microSurface = 1.0 - blur;
            hdrSkyboxMaterial.disableLighting = true;
            hdrSkyboxMaterial.twoSidedLighting = true;
            hdrSkybox.infiniteDistance = true;
            hdrSkybox.material = hdrSkyboxMaterial;
        }
        else {
            let skyboxMaterial = new StandardMaterial("skyBox", this);
            skyboxMaterial.backFaceCulling = false;
            skyboxMaterial.reflectionTexture = environmentTexture.clone();
            if (skyboxMaterial.reflectionTexture) {
                skyboxMaterial.reflectionTexture.coordinatesMode = Texture.SKYBOX_MODE;
            }
            skyboxMaterial.disableLighting = true;
            hdrSkybox.infiniteDistance = true;
            hdrSkybox.material = skyboxMaterial;
        }

        return hdrSkybox;
    };

    Scene.prototype.createDefaultEnvironment = function(options: Partial<IEnvironmentHelperOptions>): Nullable<EnvironmentHelper> {
        if (EnvironmentHelper) {
            return new EnvironmentHelper(options, this);
        }
        return null;
    };

    Scene.prototype.createDefaultXRExperienceAsync = function(): Promise<BABYLON.WebXRExperienceHelper> {
        return BABYLON.WebXRExperienceHelper.CreateAsync(this).then((helper) => {
            var outputCanvas = new BABYLON.WebXRManagedOutputCanvas(helper);
            return BABYLON.WebXREnterExitUI.CreateAsync(this, helper, {outputCanvasContext: outputCanvas.canvasContext}).then((ui) => {
                return helper;
            });
        });
    };
}