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# 12.70. XR_HTC_vive_wrist_tracker_interaction
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## Name String
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XR_HTC_vive_wrist_tracker_interaction
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## Revision
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1
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## VIVE Wrist Tracker input
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### Interaction profile path:
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- /interaction_profiles/htc/vive_wrist_tracker
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### Valid for user paths:
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- /user/wrist_htc/left
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- /user/wrist_htc/right
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### Supported input source
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- On /user/wrist_htc/left only:
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- <20>K/input/menu/click
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- <20>K/input/x/click
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- On /user/wrist_htc/right only:
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- <20>K/input/system/click (may not be available for application use)
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- <20>K/input/a/click
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- <20>K/input/entity_htc/pose
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The entity_htc pose allows the applications to recognize the origin of a tracked input device, especially for the wearable devices which are not held in the user<65><72>s hand. The entity_htc pose is defined as follows:
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- The entity position: The center position of the tracked device.
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- The entity orientation: Oriented with +Y up, +X to the right, and -Z forward.
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## VIVE Plugin
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After adding the "VIVE Focus3 Wrist Tracker" to "Project Settings > XR Plugin-in Management > OpenXR > Android Tab > Interaction Profiles", you can use the following Input Action Pathes.
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### Left Hand
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- <ViveWristTracker>{LeftHand}/primaryButton: Left tracker primary button pressed state.
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- <ViveWristTracker>{LeftHand}/menu: Left tracker menu button pressed state.
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- <ViveWristTracker>{LeftHand}/devicePose: Left tracker pose.
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- <ViveWristTracker>{LeftHand}/devicePose/isTracked: Left tracker tracking state.
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### Right Hand
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- <ViveWristTracker>{RightHand}/primaryButton: Right tracker primary button pressed state.
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- <ViveWristTracker>{RightHand}/menu: Right tracker menu button pressed state.
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- <ViveWristTracker>{RightHand}/devicePose: Right tracker pose.
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- <ViveWristTracker>{RightHand}/devicePose/isTracked: Right tracker tracking state.
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Refer to the <VIVE OpenXR sample path>/Plugin/Input/ActionMap/InputActions.inputActions about the "Input Action Path" usage and the sample <VIVE OpenXR sample path>/Plugin/Input/OpenXRInput.unity.
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// Copyright HTC Corporation All Rights Reserved.
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using System.Collections.Generic;
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using UnityEditor;
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using UnityEngine.XR.OpenXR;
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using UnityEngine.XR.OpenXR.Features;
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using System.Runtime.InteropServices;
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using System;
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using UnityEngine;
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#if UNITY_EDITOR
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using UnityEditor.XR.OpenXR.Features;
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#endif
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namespace VIVE.OpenXR
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{
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#if UNITY_EDITOR
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[OpenXRFeature(UiName = "VIVE XR Foveation",
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Desc = "Support the HTC foveation extension.",
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Company = "HTC",
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DocumentationLink = "..\\Documentation",
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OpenxrExtensionStrings = "XR_HTC_foveation",
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Version = "1.0.0",
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BuildTargetGroups = new[] { BuildTargetGroup.Android },
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FeatureId = featureId
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)]
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#endif
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public class ViveFoveation : OpenXRFeature
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{
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/// <summary>
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/// Flag bits for XrFoveationDynamicFlagsHTC
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/// </summary>
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public const UInt64 XR_FOVEATION_DYNAMIC_LEVEL_ENABLED_BIT_HTC = 0x00000001;
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public const UInt64 XR_FOVEATION_DYNAMIC_CLEAR_FOV_ENABLED_BIT_HTC = 0x00000002;
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public const UInt64 XR_FOVEATION_DYNAMIC_FOCAL_CENTER_OFFSET_ENABLED_BIT_HTC = 0x00000004;
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/// <summary>
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/// The feature id string. This is used to give the feature a well known id for reference.
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/// </summary>
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public const string featureId = "vive.openxr.feature.foveation";
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protected override IntPtr HookGetInstanceProcAddr(IntPtr func)
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{
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Debug.Log("EXT: registering our own xrGetInstanceProcAddr");
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if (SystemInfo.graphicsDeviceType == UnityEngine.Rendering.GraphicsDeviceType.Vulkan)
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{
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Debug.Log("Vulkan no hook foveation");
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return func;
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}
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return intercept_xrGetInstanceProcAddr(func);
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}
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private const string ExtLib = "viveopenxr";
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[DllImport(ExtLib, EntryPoint = "intercept_xrGetInstanceProcAddr")]
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private static extern IntPtr intercept_xrGetInstanceProcAddr(IntPtr func);
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[DllImport(ExtLib, EntryPoint = "applyFoveationHTC")]
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private static extern XrResult applyFoveationHTC(XrFoveationModeHTC mode, UInt32 configCount, XrFoveationConfigurationHTC[] configs, UInt64 flags);
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/// <summary>
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/// function to apply HTC Foveation
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/// </summary>
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public static XrResult ApplyFoveationHTC(XrFoveationModeHTC mode, UInt32 configCount, XrFoveationConfigurationHTC[] configs, UInt64 flags = 0)
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{
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//Debug.Log("Unity HTCFoveat:configCount " + configCount);
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//if (configCount >=2) {
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//Debug.Log("Unity HTCFoveat:configs[0].clearFovDegree " + configs[0].clearFovDegree);
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//Debug.Log("Unity HTCFoveat:configs[0].level " + configs[0].level);
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//Debug.Log("Unity HTCFoveat:configs[1].clearFovDegree " + configs[1].clearFovDegree);
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//Debug.Log("Unity HTCFoveat:configs[1].level " + configs[1].level);
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//}
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return applyFoveationHTC(mode, configCount, configs, flags);
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}
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}
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}
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