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Assets/Samples/XR Hands/1.7.1/HandVisualizer/Scripts/HandProcessor.cs

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+using System.Collections.Generic;
+using UnityEngine.XR.Hands.Processing;
+
+namespace UnityEngine.XR.Hands.Samples.VisualizerSample
+{
+    /// <summary>
+    /// Example hand processor that applies transformations on the root poses to
+    /// modify the hands skeleton. Note it is possible to modify the bones
+    /// directly for more advanced use cases that are not shown here.
+    /// </summary>
+    public class HandProcessor : MonoBehaviour, IXRHandProcessor
+    {
+        /// <inheritdoc />
+        public int callbackOrder => 0;
+
+        /// <summary>
+        /// The mode to use for the sample processor.
+        /// </summary>
+        public enum ProcessorExampleMode
+        {
+            /// <summary>
+            /// No processing is applied.
+            /// </summary>
+            None,
+
+            /// <summary>
+            /// Smooths the hand root pose of the left and right hands with interpolated positions
+            /// </summary>
+            Smoothing,
+
+            /// <summary>
+            /// Inverts the left and right hands.
+            /// </summary>
+            Invert
+        }
+
+        // Variables used for smoothing hand movements.
+        bool m_FirstFrame = false;
+        Vector3 m_LastLeftHandPosition;
+        Vector3 m_LastRightHandPosition;
+        Pose m_LeftHandPose = Pose.identity;
+        Pose m_RightHandPose = Pose.identity;
+
+        [SerializeField]
+        [Tooltip("The mode to use for the sample processor.")]
+        ProcessorExampleMode m_ProcessorExampleMode = ProcessorExampleMode.Smoothing;
+        ProcessorExampleMode m_LastProcessorExampleMode = ProcessorExampleMode.None;
+
+        /// <summary>
+        /// The <see cref="ProcessorExampleMode"/> to use for the sample processor.
+        /// </summary>
+        public ProcessorExampleMode processorExampleMode
+        {
+            get => m_ProcessorExampleMode;
+            set => m_ProcessorExampleMode = value;
+        }
+
+        // Smoothing factors for the left and right hands.
+        [Header("Smoothing parameters")]
+        [SerializeField]
+        [Tooltip("The smoothing factor to use when smoothing the root of the left hand in the sample processor. Use 0 for no smoothing.")]
+        float m_LeftHandSmoothingFactor = 16f;
+
+        [SerializeField]
+        [Tooltip("The smoothing factor to use when smoothing the root of the right hand in the sample processor. Use 0 for no smoothing.")]
+        float m_RightHandSmoothingFactor = 16f;
+
+        /// <inheritdoc />
+        public void ProcessJoints(XRHandSubsystem subsystem, XRHandSubsystem.UpdateSuccessFlags successFlags, XRHandSubsystem.UpdateType updateType)
+        {
+            switch (m_ProcessorExampleMode)
+            {
+                case ProcessorExampleMode.Smoothing:
+                    SmoothHandsExample(subsystem, successFlags, updateType, m_LastProcessorExampleMode != m_ProcessorExampleMode);
+                    break;
+
+                case ProcessorExampleMode.Invert:
+                    InvertHandsExample(subsystem, successFlags, updateType);
+                    break;
+            }
+
+            m_LastProcessorExampleMode = m_ProcessorExampleMode;
+        }
+
+        // Smooths the hand movements of an XRHandSubsystem by updating the root
+        // pose of the left and right hands with interpolated positions.
+        void SmoothHandsExample(XRHandSubsystem subsystem, XRHandSubsystem.UpdateSuccessFlags successFlags, XRHandSubsystem.UpdateType updateType, bool modeChanged)
+        {
+            var leftHand = subsystem.leftHand;
+            var rightHand = subsystem.rightHand;
+
+            if (leftHand.isTracked && m_LeftHandSmoothingFactor > 0)
+            {
+                var leftPose = leftHand.rootPose;
+                var currentLeftHandPosition = leftPose.position;
+                if (!m_FirstFrame && !modeChanged)
+                {
+                    float tweenAmt = Time.deltaTime * m_LeftHandSmoothingFactor;
+                    currentLeftHandPosition = Vector3.Lerp(m_LastLeftHandPosition, currentLeftHandPosition, tweenAmt);
+                    m_LeftHandPose.position = currentLeftHandPosition;
+                    m_LeftHandPose.rotation = leftPose.rotation;
+
+                    leftHand.SetRootPose(m_LeftHandPose);
+                    subsystem.SetCorrespondingHand(leftHand);
+                }
+                m_LastLeftHandPosition = currentLeftHandPosition;
+            }
+
+            if (rightHand.isTracked && m_RightHandSmoothingFactor > 0)
+            {
+                var rightPose = rightHand.rootPose;
+                var currentRightHandPosition = rightPose.position;
+                if (!m_FirstFrame && !modeChanged)
+                {
+                    float tweenAmt = Time.deltaTime * m_RightHandSmoothingFactor;
+                    currentRightHandPosition = Vector3.Lerp(m_LastRightHandPosition, currentRightHandPosition, tweenAmt);
+                    m_RightHandPose.position = currentRightHandPosition;
+                    m_RightHandPose.rotation = rightPose.rotation;
+
+                    rightHand.SetRootPose(m_RightHandPose);
+                    subsystem.SetCorrespondingHand(rightHand);
+                }
+                m_LastRightHandPosition = currentRightHandPosition;
+            }
+        }
+
+        // Call this from process joints to try inverting the user's hands.
+        void InvertHandsExample(XRHandSubsystem subsystem, XRHandSubsystem.UpdateSuccessFlags successFlags, XRHandSubsystem.UpdateType updateType)
+        {
+            var leftHand = subsystem.leftHand;
+            var leftHandPose = leftHand.rootPose;
+
+            var rightHand = subsystem.rightHand;
+            var rightHandPose = rightHand.rootPose;
+
+            if (leftHand.isTracked)
+            {
+                leftHand.SetRootPose(rightHandPose);
+                subsystem.SetCorrespondingHand(leftHand);
+
+                rightHand.SetRootPose(leftHandPose);
+                subsystem.SetCorrespondingHand(rightHand);
+            }
+        }
+
+        void Update()
+        {
+            if (m_Subsystem != null)
+                return;
+
+            SubsystemManager.GetSubsystems(s_SubsystemsReuse);
+            if (s_SubsystemsReuse.Count == 0)
+                return;
+
+            m_Subsystem = s_SubsystemsReuse[0];
+            m_Subsystem.RegisterProcessor(this);
+        }
+
+        void OnDisable()
+        {
+            if (m_Subsystem != null)
+            {
+                m_Subsystem.UnregisterProcessor(this);
+                m_Subsystem = null;
+            }
+        }
+
+        XRHandSubsystem m_Subsystem;
+        static List<XRHandSubsystem> s_SubsystemsReuse = new List<XRHandSubsystem>();
+    }
+}