| 1 |
- {"ast":null,"code":"import { TmpVectors, Vector2, Vector3 } from \"../../Maths/math.vector.js\";\nimport { Logger } from \"../../Misc/logger.js\";\nimport { Observable } from \"../../Misc/observable.js\";\nimport { WebXRFeatureName, WebXRFeaturesManager } from \"../webXRFeaturesManager.js\";\nimport { WebXRAbstractFeature } from \"./WebXRAbstractFeature.js\";\nclass CircleBuffer {\n constructor(numSamples, initializer) {\n this._samples = [];\n this._idx = 0;\n for (let idx = 0; idx < numSamples; ++idx) {\n this._samples.push(initializer ? initializer() : Vector2.Zero());\n }\n }\n get length() {\n return this._samples.length;\n }\n push(x, y) {\n this._idx = (this._idx + this._samples.length - 1) % this._samples.length;\n this.at(0).copyFromFloats(x, y);\n }\n at(idx) {\n if (idx >= this._samples.length) {\n throw new Error(\"Index out of bounds\");\n }\n return this._samples[(this._idx + idx) % this._samples.length];\n }\n}\nclass FirstStepDetector {\n constructor() {\n this._samples = new CircleBuffer(20);\n this._entropy = 0;\n this.onFirstStepDetected = new Observable();\n }\n update(posX, posY, forwardX, forwardY) {\n this._samples.push(posX, posY);\n const origin = this._samples.at(0);\n this._entropy *= this._entropyDecayFactor;\n this._entropy += Vector2.Distance(origin, this._samples.at(1));\n if (this._entropy > this._entropyThreshold) {\n return;\n }\n let samePointIdx;\n for (samePointIdx = this._samePointCheckStartIdx; samePointIdx < this._samples.length; ++samePointIdx) {\n if (Vector2.DistanceSquared(origin, this._samples.at(samePointIdx)) < this._samePointSquaredDistanceThreshold) {\n break;\n }\n }\n if (samePointIdx === this._samples.length) {\n return;\n }\n let apexDistSquared = -1;\n let apexIdx = 0;\n for (let distSquared, idx = 1; idx < samePointIdx; ++idx) {\n distSquared = Vector2.DistanceSquared(origin, this._samples.at(idx));\n if (distSquared > apexDistSquared) {\n apexIdx = idx;\n apexDistSquared = distSquared;\n }\n }\n if (apexDistSquared < this._apexSquaredDistanceThreshold) {\n return;\n }\n const apex = this._samples.at(apexIdx);\n const axis = apex.subtract(origin);\n axis.normalize();\n const vec = TmpVectors.Vector2[0];\n let dot;\n let sample;\n let sumSquaredProjectionDistances = 0;\n for (let idx = 1; idx < samePointIdx; ++idx) {\n sample = this._samples.at(idx);\n sample.subtractToRef(origin, vec);\n dot = Vector2.Dot(axis, vec);\n sumSquaredProjectionDistances += vec.lengthSquared() - dot * dot;\n }\n if (sumSquaredProjectionDistances > samePointIdx * this._squaredProjectionDistanceThreshold) {\n return;\n }\n const forwardVec = TmpVectors.Vector3[0];\n forwardVec.set(forwardX, forwardY, 0);\n const axisVec = TmpVectors.Vector3[1];\n axisVec.set(axis.x, axis.y, 0);\n const isApexLeft = Vector3.Cross(forwardVec, axisVec).z > 0;\n const leftApex = origin.clone();\n const rightApex = origin.clone();\n apex.subtractToRef(origin, axis);\n if (isApexLeft) {\n axis.scaleAndAddToRef(this._axisToApexShrinkFactor, leftApex);\n axis.scaleAndAddToRef(this._axisToApexExtendFactor, rightApex);\n } else {\n axis.scaleAndAddToRef(this._axisToApexExtendFactor, leftApex);\n axis.scaleAndAddToRef(this._axisToApexShrinkFactor, rightApex);\n }\n this.onFirstStepDetected.notifyObservers({\n leftApex: leftApex,\n rightApex: rightApex,\n currentPosition: origin,\n currentStepDirection: isApexLeft ? \"right\" : \"left\"\n });\n }\n reset() {\n for (let idx = 0; idx < this._samples.length; ++idx) {\n this._samples.at(idx).copyFromFloats(0, 0);\n }\n }\n get _samePointCheckStartIdx() {\n return Math.floor(this._samples.length / 3);\n }\n get _samePointSquaredDistanceThreshold() {\n return 0.03 * 0.03;\n }\n get _apexSquaredDistanceThreshold() {\n return 0.09 * 0.09;\n }\n get _squaredProjectionDistanceThreshold() {\n return 0.03 * 0.03;\n }\n get _axisToApexShrinkFactor() {\n return 0.8;\n }\n get _axisToApexExtendFactor() {\n return -1.6;\n }\n get _entropyDecayFactor() {\n return 0.93;\n }\n get _entropyThreshold() {\n return 0.4;\n }\n}\nclass WalkingTracker {\n constructor(leftApex, rightApex, currentPosition, currentStepDirection) {\n this._leftApex = new Vector2();\n this._rightApex = new Vector2();\n this._currentPosition = new Vector2();\n this._axis = new Vector2();\n this._axisLength = -1;\n this._forward = new Vector2();\n this._steppingLeft = false;\n this._t = -1;\n this._maxT = -1;\n this._maxTPosition = new Vector2();\n this._vitality = 0;\n this.onMovement = new Observable();\n this.onFootfall = new Observable();\n this._reset(leftApex, rightApex, currentPosition, currentStepDirection === \"left\");\n }\n _reset(leftApex, rightApex, currentPosition, steppingLeft) {\n this._leftApex.copyFrom(leftApex);\n this._rightApex.copyFrom(rightApex);\n this._steppingLeft = steppingLeft;\n if (this._steppingLeft) {\n this._leftApex.subtractToRef(this._rightApex, this._axis);\n this._forward.copyFromFloats(-this._axis.y, this._axis.x);\n } else {\n this._rightApex.subtractToRef(this._leftApex, this._axis);\n this._forward.copyFromFloats(this._axis.y, -this._axis.x);\n }\n this._axisLength = this._axis.length();\n this._forward.scaleInPlace(1 / this._axisLength);\n this._updateTAndVitality(currentPosition.x, currentPosition.y);\n this._maxT = this._t;\n this._maxTPosition.copyFrom(currentPosition);\n this._vitality = 1;\n }\n _updateTAndVitality(x, y) {\n this._currentPosition.copyFromFloats(x, y);\n if (this._steppingLeft) {\n this._currentPosition.subtractInPlace(this._rightApex);\n } else {\n this._currentPosition.subtractInPlace(this._leftApex);\n }\n const priorT = this._t;\n const dot = Vector2.Dot(this._currentPosition, this._axis);\n this._t = dot / (this._axisLength * this._axisLength);\n const projDistSquared = this._currentPosition.lengthSquared() - dot / this._axisLength * (dot / this._axisLength);\n // TODO: Extricate the magic.\n this._vitality *= 0.92 - 100 * Math.max(projDistSquared - 0.0016, 0) + Math.max(this._t - priorT, 0);\n }\n update(x, y) {\n if (this._vitality < this._vitalityThreshold) {\n return false;\n }\n const priorT = this._t;\n this._updateTAndVitality(x, y);\n if (this._t > this._maxT) {\n this._maxT = this._t;\n this._maxTPosition.copyFromFloats(x, y);\n }\n if (this._vitality < this._vitalityThreshold) {\n return false;\n }\n if (this._t > priorT) {\n this.onMovement.notifyObservers({\n deltaT: this._t - priorT\n });\n if (priorT < 0.5 && this._t >= 0.5) {\n this.onFootfall.notifyObservers({\n foot: this._steppingLeft ? \"left\" : \"right\"\n });\n }\n }\n if (this._t < 0.95 * this._maxT) {\n this._currentPosition.copyFromFloats(x, y);\n if (this._steppingLeft) {\n this._leftApex.copyFrom(this._maxTPosition);\n } else {\n this._rightApex.copyFrom(this._maxTPosition);\n }\n this._reset(this._leftApex, this._rightApex, this._currentPosition, !this._steppingLeft);\n }\n if (this._axisLength < 0.03) {\n return false;\n }\n return true;\n }\n get _vitalityThreshold() {\n return 0.1;\n }\n get forward() {\n return this._forward;\n }\n}\nclass Walker {\n static get _MillisecondsPerUpdate() {\n // 15 FPS\n return 1000 / 15;\n }\n constructor(engine) {\n this._detector = new FirstStepDetector();\n this._walker = null;\n this._movement = new Vector2();\n this._millisecondsSinceLastUpdate = Walker._MillisecondsPerUpdate;\n this.movementThisFrame = Vector3.Zero();\n this._engine = engine;\n this._detector.onFirstStepDetected.add(event => {\n if (!this._walker) {\n this._walker = new WalkingTracker(event.leftApex, event.rightApex, event.currentPosition, event.currentStepDirection);\n this._walker.onFootfall.add(() => {\n Logger.Log(\"Footfall!\");\n });\n this._walker.onMovement.add(event => {\n this._walker.forward.scaleAndAddToRef(0.024 * event.deltaT, this._movement);\n });\n }\n });\n }\n update(position, forward) {\n forward.y = 0;\n forward.normalize();\n // Enforce reduced framerate\n this._millisecondsSinceLastUpdate += this._engine.getDeltaTime();\n if (this._millisecondsSinceLastUpdate >= Walker._MillisecondsPerUpdate) {\n this._millisecondsSinceLastUpdate -= Walker._MillisecondsPerUpdate;\n this._detector.update(position.x, position.z, forward.x, forward.z);\n if (this._walker) {\n const updated = this._walker.update(position.x, position.z);\n if (!updated) {\n this._walker = null;\n }\n }\n this._movement.scaleInPlace(0.85);\n }\n this.movementThisFrame.set(this._movement.x, 0, this._movement.y);\n }\n}\n/**\n * A module that will enable VR locomotion by detecting when the user walks in place.\n */\nexport class WebXRWalkingLocomotion extends WebXRAbstractFeature {\n /**\n * The module's name.\n */\n static get Name() {\n return WebXRFeatureName.WALKING_LOCOMOTION;\n }\n /**\n * The (Babylon) version of this module.\n * This is an integer representing the implementation version.\n * This number has no external basis.\n */\n static get Version() {\n return 1;\n }\n /**\n * The target to be articulated by walking locomotion.\n * When the walking locomotion feature detects walking in place, this element's\n * X and Z coordinates will be modified to reflect locomotion. This target should\n * be either the XR space's origin (i.e., the parent node of the WebXRCamera) or\n * the WebXRCamera itself. Note that the WebXRCamera path will modify the position\n * of the WebXRCamera directly and is thus discouraged.\n */\n get locomotionTarget() {\n return this._locomotionTarget;\n }\n /**\n * The target to be articulated by walking locomotion.\n * When the walking locomotion feature detects walking in place, this element's\n * X and Z coordinates will be modified to reflect locomotion. This target should\n * be either the XR space's origin (i.e., the parent node of the WebXRCamera) or\n * the WebXRCamera itself. Note that the WebXRCamera path will modify the position\n * of the WebXRCamera directly and is thus discouraged.\n */\n set locomotionTarget(locomotionTarget) {\n this._locomotionTarget = locomotionTarget;\n this._isLocomotionTargetWebXRCamera = this._locomotionTarget.getClassName() === \"WebXRCamera\";\n }\n /**\n * Construct a new Walking Locomotion feature.\n * @param sessionManager manager for the current XR session\n * @param options creation options, prominently including the vector target for locomotion\n */\n constructor(sessionManager, options) {\n super(sessionManager);\n this._up = new Vector3();\n this._forward = new Vector3();\n this._position = new Vector3();\n this._movement = new Vector3();\n this._sessionManager = sessionManager;\n this.locomotionTarget = options.locomotionTarget;\n if (this._isLocomotionTargetWebXRCamera) {\n Logger.Warn(\"Using walking locomotion directly on a WebXRCamera may have unintended interactions with other XR techniques. Using an XR space parent is highly recommended\");\n }\n }\n /**\n * Checks whether this feature is compatible with the current WebXR session.\n * Walking locomotion is only compatible with \"immersive-vr\" sessions.\n * @returns true if compatible, false otherwise\n */\n isCompatible() {\n return this._sessionManager.sessionMode === undefined || this._sessionManager.sessionMode === \"immersive-vr\";\n }\n /**\n * Attaches the feature.\n * Typically called automatically by the features manager.\n * @returns true if attach succeeded, false otherwise\n */\n attach() {\n if (!this.isCompatible || !super.attach()) {\n return false;\n }\n this._walker = new Walker(this._sessionManager.scene.getEngine());\n return true;\n }\n /**\n * Detaches the feature.\n * Typically called automatically by the features manager.\n * @returns true if detach succeeded, false otherwise\n */\n detach() {\n if (!super.detach()) {\n return false;\n }\n this._walker = null;\n return true;\n }\n _onXRFrame(frame) {\n const pose = frame.getViewerPose(this._sessionManager.baseReferenceSpace);\n if (!pose) {\n return;\n }\n const handednessScalar = this.locomotionTarget.getScene().useRightHandedSystem ? 1 : -1;\n const m = pose.transform.matrix;\n this._up.copyFromFloats(m[4], m[5], handednessScalar * m[6]);\n this._forward.copyFromFloats(m[8], m[9], handednessScalar * m[10]);\n this._position.copyFromFloats(m[12], m[13], handednessScalar * m[14]);\n // Compute the nape position\n this._forward.scaleAndAddToRef(0.05, this._position);\n this._up.scaleAndAddToRef(-0.05, this._position);\n this._walker.update(this._position, this._forward);\n this._movement.copyFrom(this._walker.movementThisFrame);\n if (!this._isLocomotionTargetWebXRCamera) {\n Vector3.TransformNormalToRef(this._movement, this.locomotionTarget.getWorldMatrix(), this._movement);\n }\n this.locomotionTarget.position.addInPlace(this._movement);\n }\n}\n//register the plugin\nWebXRFeaturesManager.AddWebXRFeature(WebXRWalkingLocomotion.Name, (xrSessionManager, options) => {\n return () => new WebXRWalkingLocomotion(xrSessionManager, options);\n}, WebXRWalkingLocomotion.Version, false);","map":{"version":3,"names":["TmpVectors","Vector2","Vector3","Logger","Observable","WebXRFeatureName","WebXRFeaturesManager","WebXRAbstractFeature","CircleBuffer","constructor","numSamples","initializer","_samples","_idx","idx","push","Zero","length","x","y","at","copyFromFloats","Error","FirstStepDetector","_entropy","onFirstStepDetected","update","posX","posY","forwardX","forwardY","origin","_entropyDecayFactor","Distance","_entropyThreshold","samePointIdx","_samePointCheckStartIdx","DistanceSquared","_samePointSquaredDistanceThreshold","apexDistSquared","apexIdx","distSquared","_apexSquaredDistanceThreshold","apex","axis","subtract","normalize","vec","dot","sample","sumSquaredProjectionDistances","subtractToRef","Dot","lengthSquared","_squaredProjectionDistanceThreshold","forwardVec","set","axisVec","isApexLeft","Cross","z","leftApex","clone","rightApex","scaleAndAddToRef","_axisToApexShrinkFactor","_axisToApexExtendFactor","notifyObservers","currentPosition","currentStepDirection","reset","Math","floor","WalkingTracker","_leftApex","_rightApex","_currentPosition","_axis","_axisLength","_forward","_steppingLeft","_t","_maxT","_maxTPosition","_vitality","onMovement","onFootfall","_reset","steppingLeft","copyFrom","scaleInPlace","_updateTAndVitality","subtractInPlace","priorT","projDistSquared","max","_vitalityThreshold","deltaT","foot","forward","Walker","_MillisecondsPerUpdate","engine","_detector","_walker","_movement","_millisecondsSinceLastUpdate","movementThisFrame","_engine","add","event","Log","position","getDeltaTime","updated","WebXRWalkingLocomotion","Name","WALKING_LOCOMOTION","Version","locomotionTarget","_locomotionTarget","_isLocomotionTargetWebXRCamera","getClassName","sessionManager","options","_up","_position","_sessionManager","Warn","isCompatible","sessionMode","undefined","attach","scene","getEngine","detach","_onXRFrame","frame","pose","getViewerPose","baseReferenceSpace","handednessScalar","getScene","useRightHandedSystem","m","transform","matrix","TransformNormalToRef","getWorldMatrix","addInPlace","AddWebXRFeature","xrSessionManager"],"sources":["F:/workspace/202226701027/huinongbao-app/node_modules/@babylonjs/core/XR/features/WebXRWalkingLocomotion.js"],"sourcesContent":["import { TmpVectors, Vector2, Vector3 } from \"../../Maths/math.vector.js\";\nimport { Logger } from \"../../Misc/logger.js\";\nimport { Observable } from \"../../Misc/observable.js\";\nimport { WebXRFeatureName, WebXRFeaturesManager } from \"../webXRFeaturesManager.js\";\nimport { WebXRAbstractFeature } from \"./WebXRAbstractFeature.js\";\nclass CircleBuffer {\n constructor(numSamples, initializer) {\n this._samples = [];\n this._idx = 0;\n for (let idx = 0; idx < numSamples; ++idx) {\n this._samples.push(initializer ? initializer() : Vector2.Zero());\n }\n }\n get length() {\n return this._samples.length;\n }\n push(x, y) {\n this._idx = (this._idx + this._samples.length - 1) % this._samples.length;\n this.at(0).copyFromFloats(x, y);\n }\n at(idx) {\n if (idx >= this._samples.length) {\n throw new Error(\"Index out of bounds\");\n }\n return this._samples[(this._idx + idx) % this._samples.length];\n }\n}\nclass FirstStepDetector {\n constructor() {\n this._samples = new CircleBuffer(20);\n this._entropy = 0;\n this.onFirstStepDetected = new Observable();\n }\n update(posX, posY, forwardX, forwardY) {\n this._samples.push(posX, posY);\n const origin = this._samples.at(0);\n this._entropy *= this._entropyDecayFactor;\n this._entropy += Vector2.Distance(origin, this._samples.at(1));\n if (this._entropy > this._entropyThreshold) {\n return;\n }\n let samePointIdx;\n for (samePointIdx = this._samePointCheckStartIdx; samePointIdx < this._samples.length; ++samePointIdx) {\n if (Vector2.DistanceSquared(origin, this._samples.at(samePointIdx)) < this._samePointSquaredDistanceThreshold) {\n break;\n }\n }\n if (samePointIdx === this._samples.length) {\n return;\n }\n let apexDistSquared = -1;\n let apexIdx = 0;\n for (let distSquared, idx = 1; idx < samePointIdx; ++idx) {\n distSquared = Vector2.DistanceSquared(origin, this._samples.at(idx));\n if (distSquared > apexDistSquared) {\n apexIdx = idx;\n apexDistSquared = distSquared;\n }\n }\n if (apexDistSquared < this._apexSquaredDistanceThreshold) {\n return;\n }\n const apex = this._samples.at(apexIdx);\n const axis = apex.subtract(origin);\n axis.normalize();\n const vec = TmpVectors.Vector2[0];\n let dot;\n let sample;\n let sumSquaredProjectionDistances = 0;\n for (let idx = 1; idx < samePointIdx; ++idx) {\n sample = this._samples.at(idx);\n sample.subtractToRef(origin, vec);\n dot = Vector2.Dot(axis, vec);\n sumSquaredProjectionDistances += vec.lengthSquared() - dot * dot;\n }\n if (sumSquaredProjectionDistances > samePointIdx * this._squaredProjectionDistanceThreshold) {\n return;\n }\n const forwardVec = TmpVectors.Vector3[0];\n forwardVec.set(forwardX, forwardY, 0);\n const axisVec = TmpVectors.Vector3[1];\n axisVec.set(axis.x, axis.y, 0);\n const isApexLeft = Vector3.Cross(forwardVec, axisVec).z > 0;\n const leftApex = origin.clone();\n const rightApex = origin.clone();\n apex.subtractToRef(origin, axis);\n if (isApexLeft) {\n axis.scaleAndAddToRef(this._axisToApexShrinkFactor, leftApex);\n axis.scaleAndAddToRef(this._axisToApexExtendFactor, rightApex);\n }\n else {\n axis.scaleAndAddToRef(this._axisToApexExtendFactor, leftApex);\n axis.scaleAndAddToRef(this._axisToApexShrinkFactor, rightApex);\n }\n this.onFirstStepDetected.notifyObservers({\n leftApex: leftApex,\n rightApex: rightApex,\n currentPosition: origin,\n currentStepDirection: isApexLeft ? \"right\" : \"left\",\n });\n }\n reset() {\n for (let idx = 0; idx < this._samples.length; ++idx) {\n this._samples.at(idx).copyFromFloats(0, 0);\n }\n }\n get _samePointCheckStartIdx() {\n return Math.floor(this._samples.length / 3);\n }\n get _samePointSquaredDistanceThreshold() {\n return 0.03 * 0.03;\n }\n get _apexSquaredDistanceThreshold() {\n return 0.09 * 0.09;\n }\n get _squaredProjectionDistanceThreshold() {\n return 0.03 * 0.03;\n }\n get _axisToApexShrinkFactor() {\n return 0.8;\n }\n get _axisToApexExtendFactor() {\n return -1.6;\n }\n get _entropyDecayFactor() {\n return 0.93;\n }\n get _entropyThreshold() {\n return 0.4;\n }\n}\nclass WalkingTracker {\n constructor(leftApex, rightApex, currentPosition, currentStepDirection) {\n this._leftApex = new Vector2();\n this._rightApex = new Vector2();\n this._currentPosition = new Vector2();\n this._axis = new Vector2();\n this._axisLength = -1;\n this._forward = new Vector2();\n this._steppingLeft = false;\n this._t = -1;\n this._maxT = -1;\n this._maxTPosition = new Vector2();\n this._vitality = 0;\n this.onMovement = new Observable();\n this.onFootfall = new Observable();\n this._reset(leftApex, rightApex, currentPosition, currentStepDirection === \"left\");\n }\n _reset(leftApex, rightApex, currentPosition, steppingLeft) {\n this._leftApex.copyFrom(leftApex);\n this._rightApex.copyFrom(rightApex);\n this._steppingLeft = steppingLeft;\n if (this._steppingLeft) {\n this._leftApex.subtractToRef(this._rightApex, this._axis);\n this._forward.copyFromFloats(-this._axis.y, this._axis.x);\n }\n else {\n this._rightApex.subtractToRef(this._leftApex, this._axis);\n this._forward.copyFromFloats(this._axis.y, -this._axis.x);\n }\n this._axisLength = this._axis.length();\n this._forward.scaleInPlace(1 / this._axisLength);\n this._updateTAndVitality(currentPosition.x, currentPosition.y);\n this._maxT = this._t;\n this._maxTPosition.copyFrom(currentPosition);\n this._vitality = 1;\n }\n _updateTAndVitality(x, y) {\n this._currentPosition.copyFromFloats(x, y);\n if (this._steppingLeft) {\n this._currentPosition.subtractInPlace(this._rightApex);\n }\n else {\n this._currentPosition.subtractInPlace(this._leftApex);\n }\n const priorT = this._t;\n const dot = Vector2.Dot(this._currentPosition, this._axis);\n this._t = dot / (this._axisLength * this._axisLength);\n const projDistSquared = this._currentPosition.lengthSquared() - (dot / this._axisLength) * (dot / this._axisLength);\n // TODO: Extricate the magic.\n this._vitality *= 0.92 - 100 * Math.max(projDistSquared - 0.0016, 0) + Math.max(this._t - priorT, 0);\n }\n update(x, y) {\n if (this._vitality < this._vitalityThreshold) {\n return false;\n }\n const priorT = this._t;\n this._updateTAndVitality(x, y);\n if (this._t > this._maxT) {\n this._maxT = this._t;\n this._maxTPosition.copyFromFloats(x, y);\n }\n if (this._vitality < this._vitalityThreshold) {\n return false;\n }\n if (this._t > priorT) {\n this.onMovement.notifyObservers({ deltaT: this._t - priorT });\n if (priorT < 0.5 && this._t >= 0.5) {\n this.onFootfall.notifyObservers({ foot: this._steppingLeft ? \"left\" : \"right\" });\n }\n }\n if (this._t < 0.95 * this._maxT) {\n this._currentPosition.copyFromFloats(x, y);\n if (this._steppingLeft) {\n this._leftApex.copyFrom(this._maxTPosition);\n }\n else {\n this._rightApex.copyFrom(this._maxTPosition);\n }\n this._reset(this._leftApex, this._rightApex, this._currentPosition, !this._steppingLeft);\n }\n if (this._axisLength < 0.03) {\n return false;\n }\n return true;\n }\n get _vitalityThreshold() {\n return 0.1;\n }\n get forward() {\n return this._forward;\n }\n}\nclass Walker {\n static get _MillisecondsPerUpdate() {\n // 15 FPS\n return 1000 / 15;\n }\n constructor(engine) {\n this._detector = new FirstStepDetector();\n this._walker = null;\n this._movement = new Vector2();\n this._millisecondsSinceLastUpdate = Walker._MillisecondsPerUpdate;\n this.movementThisFrame = Vector3.Zero();\n this._engine = engine;\n this._detector.onFirstStepDetected.add((event) => {\n if (!this._walker) {\n this._walker = new WalkingTracker(event.leftApex, event.rightApex, event.currentPosition, event.currentStepDirection);\n this._walker.onFootfall.add(() => {\n Logger.Log(\"Footfall!\");\n });\n this._walker.onMovement.add((event) => {\n this._walker.forward.scaleAndAddToRef(0.024 * event.deltaT, this._movement);\n });\n }\n });\n }\n update(position, forward) {\n forward.y = 0;\n forward.normalize();\n // Enforce reduced framerate\n this._millisecondsSinceLastUpdate += this._engine.getDeltaTime();\n if (this._millisecondsSinceLastUpdate >= Walker._MillisecondsPerUpdate) {\n this._millisecondsSinceLastUpdate -= Walker._MillisecondsPerUpdate;\n this._detector.update(position.x, position.z, forward.x, forward.z);\n if (this._walker) {\n const updated = this._walker.update(position.x, position.z);\n if (!updated) {\n this._walker = null;\n }\n }\n this._movement.scaleInPlace(0.85);\n }\n this.movementThisFrame.set(this._movement.x, 0, this._movement.y);\n }\n}\n/**\n * A module that will enable VR locomotion by detecting when the user walks in place.\n */\nexport class WebXRWalkingLocomotion extends WebXRAbstractFeature {\n /**\n * The module's name.\n */\n static get Name() {\n return WebXRFeatureName.WALKING_LOCOMOTION;\n }\n /**\n * The (Babylon) version of this module.\n * This is an integer representing the implementation version.\n * This number has no external basis.\n */\n static get Version() {\n return 1;\n }\n /**\n * The target to be articulated by walking locomotion.\n * When the walking locomotion feature detects walking in place, this element's\n * X and Z coordinates will be modified to reflect locomotion. This target should\n * be either the XR space's origin (i.e., the parent node of the WebXRCamera) or\n * the WebXRCamera itself. Note that the WebXRCamera path will modify the position\n * of the WebXRCamera directly and is thus discouraged.\n */\n get locomotionTarget() {\n return this._locomotionTarget;\n }\n /**\n * The target to be articulated by walking locomotion.\n * When the walking locomotion feature detects walking in place, this element's\n * X and Z coordinates will be modified to reflect locomotion. This target should\n * be either the XR space's origin (i.e., the parent node of the WebXRCamera) or\n * the WebXRCamera itself. Note that the WebXRCamera path will modify the position\n * of the WebXRCamera directly and is thus discouraged.\n */\n set locomotionTarget(locomotionTarget) {\n this._locomotionTarget = locomotionTarget;\n this._isLocomotionTargetWebXRCamera = this._locomotionTarget.getClassName() === \"WebXRCamera\";\n }\n /**\n * Construct a new Walking Locomotion feature.\n * @param sessionManager manager for the current XR session\n * @param options creation options, prominently including the vector target for locomotion\n */\n constructor(sessionManager, options) {\n super(sessionManager);\n this._up = new Vector3();\n this._forward = new Vector3();\n this._position = new Vector3();\n this._movement = new Vector3();\n this._sessionManager = sessionManager;\n this.locomotionTarget = options.locomotionTarget;\n if (this._isLocomotionTargetWebXRCamera) {\n Logger.Warn(\"Using walking locomotion directly on a WebXRCamera may have unintended interactions with other XR techniques. Using an XR space parent is highly recommended\");\n }\n }\n /**\n * Checks whether this feature is compatible with the current WebXR session.\n * Walking locomotion is only compatible with \"immersive-vr\" sessions.\n * @returns true if compatible, false otherwise\n */\n isCompatible() {\n return this._sessionManager.sessionMode === undefined || this._sessionManager.sessionMode === \"immersive-vr\";\n }\n /**\n * Attaches the feature.\n * Typically called automatically by the features manager.\n * @returns true if attach succeeded, false otherwise\n */\n attach() {\n if (!this.isCompatible || !super.attach()) {\n return false;\n }\n this._walker = new Walker(this._sessionManager.scene.getEngine());\n return true;\n }\n /**\n * Detaches the feature.\n * Typically called automatically by the features manager.\n * @returns true if detach succeeded, false otherwise\n */\n detach() {\n if (!super.detach()) {\n return false;\n }\n this._walker = null;\n return true;\n }\n _onXRFrame(frame) {\n const pose = frame.getViewerPose(this._sessionManager.baseReferenceSpace);\n if (!pose) {\n return;\n }\n const handednessScalar = this.locomotionTarget.getScene().useRightHandedSystem ? 1 : -1;\n const m = pose.transform.matrix;\n this._up.copyFromFloats(m[4], m[5], handednessScalar * m[6]);\n this._forward.copyFromFloats(m[8], m[9], handednessScalar * m[10]);\n this._position.copyFromFloats(m[12], m[13], handednessScalar * m[14]);\n // Compute the nape position\n this._forward.scaleAndAddToRef(0.05, this._position);\n this._up.scaleAndAddToRef(-0.05, this._position);\n this._walker.update(this._position, this._forward);\n this._movement.copyFrom(this._walker.movementThisFrame);\n if (!this._isLocomotionTargetWebXRCamera) {\n Vector3.TransformNormalToRef(this._movement, this.locomotionTarget.getWorldMatrix(), this._movement);\n }\n this.locomotionTarget.position.addInPlace(this._movement);\n }\n}\n//register the plugin\nWebXRFeaturesManager.AddWebXRFeature(WebXRWalkingLocomotion.Name, (xrSessionManager, options) => {\n return () => new WebXRWalkingLocomotion(xrSessionManager, options);\n}, WebXRWalkingLocomotion.Version, 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