Expose OpenXR raw hand tracking data

6 files changed, 418 insertions, 2 deletions

diff --git a/modules/openxr/doc_classes/OpenXRInterface.xml b/modules/openxr/doc_classes/OpenXRInterface.xml
index f0ca649fe4..8d8cbf1a29 100644
--- a/modules/openxr/doc_classes/OpenXRInterface.xml
+++ b/modules/openxr/doc_classes/OpenXRInterface.xml
@@ -23,6 +23,53 @@
 				Returns display refresh rates supported by the current HMD. Only returned if this feature is supported by the OpenXR runtime and after the interface has been initialized.
 			</description>
 		</method>
+		<method name="get_hand_joint_angular_velocity" qualifiers="const">
+			<return type="Vector3" />
+			<param index="0" name="hand" type="int" enum="OpenXRInterface.Hand" />
+			<param index="1" name="joint" type="int" enum="OpenXRInterface.HandJoints" />
+			<description>
+				If handtracking is enabled, returns the angular velocity of a joint ([param joint]) of a hand ([param hand]) as provided by OpenXR. This is relative to [XROrigin3D]!
+			</description>
+		</method>
+		<method name="get_hand_joint_linear_velocity" qualifiers="const">
+			<return type="Vector3" />
+			<param index="0" name="hand" type="int" enum="OpenXRInterface.Hand" />
+			<param index="1" name="joint" type="int" enum="OpenXRInterface.HandJoints" />
+			<description>
+				If handtracking is enabled, returns the linear velocity of a joint ([param joint]) of a hand ([param hand]) as provided by OpenXR. This is relative to [XROrigin3D] without worldscale applied!
+			</description>
+		</method>
+		<method name="get_hand_joint_position" qualifiers="const">
+			<return type="Vector3" />
+			<param index="0" name="hand" type="int" enum="OpenXRInterface.Hand" />
+			<param index="1" name="joint" type="int" enum="OpenXRInterface.HandJoints" />
+			<description>
+				If handtracking is enabled, returns the position of a joint ([param joint]) of a hand ([param hand]) as provided by OpenXR. This is relative to [XROrigin3D] without worldscale applied!
+			</description>
+		</method>
+		<method name="get_hand_joint_radius" qualifiers="const">
+			<return type="float" />
+			<param index="0" name="hand" type="int" enum="OpenXRInterface.Hand" />
+			<param index="1" name="joint" type="int" enum="OpenXRInterface.HandJoints" />
+			<description>
+				If handtracking is enabled, returns the radius of a joint ([param joint]) of a hand ([param hand]) as provided by OpenXR. This is without worldscale applied!
+			</description>
+		</method>
+		<method name="get_hand_joint_rotation" qualifiers="const">
+			<return type="Quaternion" />
+			<param index="0" name="hand" type="int" enum="OpenXRInterface.Hand" />
+			<param index="1" name="joint" type="int" enum="OpenXRInterface.HandJoints" />
+			<description>
+				If handtracking is enabled, returns the rotation of a joint ([param joint]) of a hand ([param hand]) as provided by OpenXR.
+			</description>
+		</method>
+		<method name="get_motion_range" qualifiers="const">
+			<return type="int" enum="OpenXRInterface.HandMotionRange" />
+			<param index="0" name="hand" type="int" enum="OpenXRInterface.Hand" />
+			<description>
+				If handtracking is enabled and motion range is supported, gets the currently configured motion range for [param hand].
+			</description>
+		</method>
 		<method name="is_action_set_active" qualifiers="const">
 			<return type="bool" />
 			<param index="0" name="name" type="String" />
@@ -38,6 +85,14 @@
 				Sets the given action set as active or inactive.
 			</description>
 		</method>
+		<method name="set_motion_range">
+			<return type="void" />
+			<param index="0" name="hand" type="int" enum="OpenXRInterface.Hand" />
+			<param index="1" name="motion_range" type="int" enum="OpenXRInterface.HandMotionRange" />
+			<description>
+				If handtracking is enabled and motion range is supported, sets the currently configured motion range for [param hand] to [param motion_range].
+			</description>
+		</method>
 	</methods>
 	<members>
 		<member name="display_refresh_rate" type="float" setter="set_display_refresh_rate" getter="get_display_refresh_rate" default="0.0">
@@ -74,4 +129,102 @@
 			</description>
 		</signal>
 	</signals>
+	<constants>
+		<constant name="HAND_LEFT" value="0" enum="Hand">
+			Left hand.
+		</constant>
+		<constant name="HAND_RIGHT" value="1" enum="Hand">
+			Right hand.
+		</constant>
+		<constant name="HAND_MAX" value="2" enum="Hand">
+			Maximum value for the hand enum.
+		</constant>
+		<constant name="HAND_MOTION_RANGE_UNOBSTRUCTED" value="0" enum="HandMotionRange">
+		</constant>
+		<constant name="HAND_MOTION_RANGE_CONFORM_TO_CONTROLLER" value="1" enum="HandMotionRange">
+		</constant>
+		<constant name="HAND_MOTION_RANGE_MAX" value="2" enum="HandMotionRange">
+		</constant>
+		<constant name="HAND_JOINT_PALM" value="0" enum="HandJoints">
+			Palm joint.
+		</constant>
+		<constant name="HAND_JOINT_WRIST" value="1" enum="HandJoints">
+			Wrist joint.
+		</constant>
+		<constant name="HAND_JOINT_THUMB_METACARPAL" value="2" enum="HandJoints">
+			Thumb metacarpal joint.
+		</constant>
+		<constant name="HAND_JOINT_THUMB_PROXIMAL" value="3" enum="HandJoints">
+			Thumb proximal joint.
+		</constant>
+		<constant name="HAND_JOINT_THUMB_DISTAL" value="4" enum="HandJoints">
+			Thumb distal joint.
+		</constant>
+		<constant name="HAND_JOINT_THUMB_TIP" value="5" enum="HandJoints">
+			Thumb tip joint.
+		</constant>
+		<constant name="HAND_JOINT_INDEX_METACARPAL" value="6" enum="HandJoints">
+			Index metacarpal joint.
+		</constant>
+		<constant name="HAND_JOINT_INDEX_PROXIMAL" value="7" enum="HandJoints">
+			Index proximal joint.
+		</constant>
+		<constant name="HAND_JOINT_INDEX_INTERMEDIATE" value="8" enum="HandJoints">
+			Index intermediate joint.
+		</constant>
+		<constant name="HAND_JOINT_INDEX_DISTAL" value="9" enum="HandJoints">
+			Index distal joint.
+		</constant>
+		<constant name="HAND_JOINT_INDEX_TIP" value="10" enum="HandJoints">
+			Index tip joint.
+		</constant>
+		<constant name="HAND_JOINT_MIDDLE_METACARPAL" value="11" enum="HandJoints">
+			Middle metacarpal joint.
+		</constant>
+		<constant name="HAND_JOINT_MIDDLE_PROXIMAL" value="12" enum="HandJoints">
+			Middle proximal joint.
+		</constant>
+		<constant name="HAND_JOINT_MIDDLE_INTERMEDIATE" value="13" enum="HandJoints">
+			Middle intermediate joint.
+		</constant>
+		<constant name="HAND_JOINT_MIDDLE_DISTAL" value="14" enum="HandJoints">
+			Middle distal joint.
+		</constant>
+		<constant name="HAND_JOINT_MIDDLE_TIP" value="15" enum="HandJoints">
+			Middle tip joint.
+		</constant>
+		<constant name="HAND_JOINT_RING_METACARPAL" value="16" enum="HandJoints">
+			Ring metacarpal joint.
+		</constant>
+		<constant name="HAND_JOINT_RING_PROXIMAL" value="17" enum="HandJoints">
+			Ring proximal joint.
+		</constant>
+		<constant name="HAND_JOINT_RING_INTERMEDIATE" value="18" enum="HandJoints">
+			Ring intermediate joint.
+		</constant>
+		<constant name="HAND_JOINT_RING_DISTAL" value="19" enum="HandJoints">
+			Ring distal joint.
+		</constant>
+		<constant name="HAND_JOINT_RING_TIP" value="20" enum="HandJoints">
+			Ring tip joint.
+		</constant>
+		<constant name="HAND_JOINT_LITTLE_METACARPAL" value="21" enum="HandJoints">
+			Little metacarpal joint.
+		</constant>
+		<constant name="HAND_JOINT_LITTLE_PROXIMAL" value="22" enum="HandJoints">
+			Little proximal joint.
+		</constant>
+		<constant name="HAND_JOINT_LITTLE_INTERMEDIATE" value="23" enum="HandJoints">
+			Little intermediate joint.
+		</constant>
+		<constant name="HAND_JOINT_LITTLE_DISTAL" value="24" enum="HandJoints">
+			Little distal joint.
+		</constant>
+		<constant name="HAND_JOINT_LITTLE_TIP" value="25" enum="HandJoints">
+			Little tip joint.
+		</constant>
+		<constant name="HAND_JOINT_MAX" value="26" enum="HandJoints">
+			Maximum value for the hand joint enum.
+		</constant>
+	</constants>
 </class>
diff --git a/modules/openxr/extensions/openxr_hand_tracking_extension.cpp b/modules/openxr/extensions/openxr_hand_tracking_extension.cpp
index 65559afed0..c92b2b08d0 100644
--- a/modules/openxr/extensions/openxr_hand_tracking_extension.cpp
+++ b/modules/openxr/extensions/openxr_hand_tracking_extension.cpp
@@ -276,3 +276,62 @@ void OpenXRHandTrackingExtension::set_motion_range(uint32_t p_hand, XrHandJoints
 	ERR_FAIL_UNSIGNED_INDEX(p_hand, MAX_OPENXR_TRACKED_HANDS);
 	hand_trackers[p_hand].motion_range = p_motion_range;
 }
+
+Quaternion OpenXRHandTrackingExtension::get_hand_joint_rotation(uint32_t p_hand, XrHandJointEXT p_joint) const {
+	ERR_FAIL_UNSIGNED_INDEX_V(p_hand, MAX_OPENXR_TRACKED_HANDS, Quaternion());
+	ERR_FAIL_UNSIGNED_INDEX_V(p_joint, XR_HAND_JOINT_COUNT_EXT, Quaternion());
+
+	if (!hand_trackers[p_hand].is_initialized) {
+		return Quaternion();
+	}
+
+	const XrHandJointLocationEXT &location = hand_trackers[p_hand].joint_locations[p_joint];
+	return Quaternion(location.pose.orientation.x, location.pose.orientation.y, location.pose.orientation.z, location.pose.orientation.w);
+}
+
+Vector3 OpenXRHandTrackingExtension::get_hand_joint_position(uint32_t p_hand, XrHandJointEXT p_joint) const {
+	ERR_FAIL_UNSIGNED_INDEX_V(p_hand, MAX_OPENXR_TRACKED_HANDS, Vector3());
+	ERR_FAIL_UNSIGNED_INDEX_V(p_joint, XR_HAND_JOINT_COUNT_EXT, Vector3());
+
+	if (!hand_trackers[p_hand].is_initialized) {
+		return Vector3();
+	}
+
+	const XrHandJointLocationEXT &location = hand_trackers[p_hand].joint_locations[p_joint];
+	return Vector3(location.pose.position.x, location.pose.position.y, location.pose.position.z);
+}
+
+float OpenXRHandTrackingExtension::get_hand_joint_radius(uint32_t p_hand, XrHandJointEXT p_joint) const {
+	ERR_FAIL_UNSIGNED_INDEX_V(p_hand, MAX_OPENXR_TRACKED_HANDS, 0.0);
+	ERR_FAIL_UNSIGNED_INDEX_V(p_joint, XR_HAND_JOINT_COUNT_EXT, 0.0);
+
+	if (!hand_trackers[p_hand].is_initialized) {
+		return 0.0;
+	}
+
+	return hand_trackers[p_hand].joint_locations[p_joint].radius;
+}
+
+Vector3 OpenXRHandTrackingExtension::get_hand_joint_linear_velocity(uint32_t p_hand, XrHandJointEXT p_joint) const {
+	ERR_FAIL_UNSIGNED_INDEX_V(p_hand, MAX_OPENXR_TRACKED_HANDS, Vector3());
+	ERR_FAIL_UNSIGNED_INDEX_V(p_joint, XR_HAND_JOINT_COUNT_EXT, Vector3());
+
+	if (!hand_trackers[p_hand].is_initialized) {
+		return Vector3();
+	}
+
+	const XrHandJointVelocityEXT &velocity = hand_trackers[p_hand].joint_velocities[p_joint];
+	return Vector3(velocity.linearVelocity.x, velocity.linearVelocity.y, velocity.linearVelocity.z);
+}
+
+Vector3 OpenXRHandTrackingExtension::get_hand_joint_angular_velocity(uint32_t p_hand, XrHandJointEXT p_joint) const {
+	ERR_FAIL_UNSIGNED_INDEX_V(p_hand, MAX_OPENXR_TRACKED_HANDS, Vector3());
+	ERR_FAIL_UNSIGNED_INDEX_V(p_joint, XR_HAND_JOINT_COUNT_EXT, Vector3());
+
+	if (!hand_trackers[p_hand].is_initialized) {
+		return Vector3();
+	}
+
+	const XrHandJointVelocityEXT &velocity = hand_trackers[p_hand].joint_velocities[p_joint];
+	return Vector3(velocity.angularVelocity.x, velocity.angularVelocity.y, velocity.angularVelocity.z);
+}
diff --git a/modules/openxr/extensions/openxr_hand_tracking_extension.h b/modules/openxr/extensions/openxr_hand_tracking_extension.h
index e86831e71b..99d315c525 100644
--- a/modules/openxr/extensions/openxr_hand_tracking_extension.h
+++ b/modules/openxr/extensions/openxr_hand_tracking_extension.h
@@ -32,6 +32,7 @@
 #define OPENXR_HAND_TRACKING_EXTENSION_H
 
 #include "../util.h"
+#include "core/math/quaternion.h"
 #include "openxr_extension_wrapper.h"
 
 #define MAX_OPENXR_TRACKED_HANDS 2
@@ -73,6 +74,13 @@ public:
 	XrHandJointsMotionRangeEXT get_motion_range(uint32_t p_hand) const;
 	void set_motion_range(uint32_t p_hand, XrHandJointsMotionRangeEXT p_motion_range);
 
+	Quaternion get_hand_joint_rotation(uint32_t p_hand, XrHandJointEXT p_joint) const;
+	Vector3 get_hand_joint_position(uint32_t p_hand, XrHandJointEXT p_joint) const;
+	float get_hand_joint_radius(uint32_t p_hand, XrHandJointEXT p_joint) const;
+
+	Vector3 get_hand_joint_linear_velocity(uint32_t p_hand, XrHandJointEXT p_joint) const;
+	Vector3 get_hand_joint_angular_velocity(uint32_t p_hand, XrHandJointEXT p_joint) const;
+
 private:
 	static OpenXRHandTrackingExtension *singleton;
 
diff --git a/modules/openxr/openxr_interface.cpp b/modules/openxr/openxr_interface.cpp
index cc2b4fa11b..4dda51147b 100644
--- a/modules/openxr/openxr_interface.cpp
+++ b/modules/openxr/openxr_interface.cpp
@@ -34,6 +34,8 @@
 #include "core/io/resource_saver.h"
 #include "servers/rendering/rendering_server_globals.h"
 
+#include "extensions/openxr_hand_tracking_extension.h"
+
 void OpenXRInterface::_bind_methods() {
 	// lifecycle signals
 	ADD_SIGNAL(MethodInfo("session_begun"));
@@ -57,6 +59,53 @@ void OpenXRInterface::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_action_sets"), &OpenXRInterface::get_action_sets);
 
 	ClassDB::bind_method(D_METHOD("get_available_display_refresh_rates"), &OpenXRInterface::get_available_display_refresh_rates);
+
+	// Hand tracking.
+	ClassDB::bind_method(D_METHOD("set_motion_range", "hand", "motion_range"), &OpenXRInterface::set_motion_range);
+	ClassDB::bind_method(D_METHOD("get_motion_range", "hand"), &OpenXRInterface::get_motion_range);
+
+	ClassDB::bind_method(D_METHOD("get_hand_joint_rotation", "hand", "joint"), &OpenXRInterface::get_hand_joint_rotation);
+	ClassDB::bind_method(D_METHOD("get_hand_joint_position", "hand", "joint"), &OpenXRInterface::get_hand_joint_position);
+	ClassDB::bind_method(D_METHOD("get_hand_joint_radius", "hand", "joint"), &OpenXRInterface::get_hand_joint_radius);
+
+	ClassDB::bind_method(D_METHOD("get_hand_joint_linear_velocity", "hand", "joint"), &OpenXRInterface::get_hand_joint_linear_velocity);
+	ClassDB::bind_method(D_METHOD("get_hand_joint_angular_velocity", "hand", "joint"), &OpenXRInterface::get_hand_joint_angular_velocity);
+
+	BIND_ENUM_CONSTANT(HAND_LEFT);
+	BIND_ENUM_CONSTANT(HAND_RIGHT);
+	BIND_ENUM_CONSTANT(HAND_MAX);
+
+	BIND_ENUM_CONSTANT(HAND_MOTION_RANGE_UNOBSTRUCTED);
+	BIND_ENUM_CONSTANT(HAND_MOTION_RANGE_CONFORM_TO_CONTROLLER);
+	BIND_ENUM_CONSTANT(HAND_MOTION_RANGE_MAX);
+
+	BIND_ENUM_CONSTANT(HAND_JOINT_PALM);
+	BIND_ENUM_CONSTANT(HAND_JOINT_WRIST);
+	BIND_ENUM_CONSTANT(HAND_JOINT_THUMB_METACARPAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_THUMB_PROXIMAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_THUMB_DISTAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_THUMB_TIP);
+	BIND_ENUM_CONSTANT(HAND_JOINT_INDEX_METACARPAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_INDEX_PROXIMAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_INDEX_INTERMEDIATE);
+	BIND_ENUM_CONSTANT(HAND_JOINT_INDEX_DISTAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_INDEX_TIP);
+	BIND_ENUM_CONSTANT(HAND_JOINT_MIDDLE_METACARPAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_MIDDLE_PROXIMAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_MIDDLE_INTERMEDIATE);
+	BIND_ENUM_CONSTANT(HAND_JOINT_MIDDLE_DISTAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_MIDDLE_TIP);
+	BIND_ENUM_CONSTANT(HAND_JOINT_RING_METACARPAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_RING_PROXIMAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_RING_INTERMEDIATE);
+	BIND_ENUM_CONSTANT(HAND_JOINT_RING_DISTAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_RING_TIP);
+	BIND_ENUM_CONSTANT(HAND_JOINT_LITTLE_METACARPAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_LITTLE_PROXIMAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_LITTLE_INTERMEDIATE);
+	BIND_ENUM_CONSTANT(HAND_JOINT_LITTLE_DISTAL);
+	BIND_ENUM_CONSTANT(HAND_JOINT_LITTLE_TIP);
+	BIND_ENUM_CONSTANT(HAND_JOINT_MAX);
 }
 
 StringName OpenXRInterface::get_name() const {
@@ -978,6 +1027,96 @@ void OpenXRInterface::on_pose_recentered() {
 	emit_signal(SNAME("pose_recentered"));
 }
 
+/** Hand tracking. */
+void OpenXRInterface::set_motion_range(const Hand p_hand, const HandMotionRange p_motion_range) {
+	ERR_FAIL_INDEX(p_hand, HAND_MAX);
+	ERR_FAIL_INDEX(p_motion_range, HAND_MOTION_RANGE_MAX);
+
+	OpenXRHandTrackingExtension *hand_tracking_ext = OpenXRHandTrackingExtension::get_singleton();
+	if (hand_tracking_ext && hand_tracking_ext->get_active()) {
+		XrHandJointsMotionRangeEXT xr_motion_range;
+		switch (p_motion_range) {
+			case HAND_MOTION_RANGE_UNOBSTRUCTED:
+				xr_motion_range = XR_HAND_JOINTS_MOTION_RANGE_UNOBSTRUCTED_EXT;
+				break;
+			case HAND_MOTION_RANGE_CONFORM_TO_CONTROLLER:
+				xr_motion_range = XR_HAND_JOINTS_MOTION_RANGE_CONFORMING_TO_CONTROLLER_EXT;
+				break;
+			default:
+				// Shouldn't get here, ERR_FAIL_INDEX should have caught this...
+				xr_motion_range = XR_HAND_JOINTS_MOTION_RANGE_CONFORMING_TO_CONTROLLER_EXT;
+				break;
+		}
+
+		hand_tracking_ext->set_motion_range(uint32_t(p_hand), xr_motion_range);
+	}
+}
+
+OpenXRInterface::HandMotionRange OpenXRInterface::get_motion_range(const Hand p_hand) const {
+	ERR_FAIL_INDEX_V(p_hand, HAND_MAX, HAND_MOTION_RANGE_MAX);
+
+	OpenXRHandTrackingExtension *hand_tracking_ext = OpenXRHandTrackingExtension::get_singleton();
+	if (hand_tracking_ext && hand_tracking_ext->get_active()) {
+		XrHandJointsMotionRangeEXT xr_motion_range = hand_tracking_ext->get_motion_range(uint32_t(p_hand));
+
+		switch (xr_motion_range) {
+			case XR_HAND_JOINTS_MOTION_RANGE_UNOBSTRUCTED_EXT:
+				return HAND_MOTION_RANGE_UNOBSTRUCTED;
+			case XR_HAND_JOINTS_MOTION_RANGE_CONFORMING_TO_CONTROLLER_EXT:
+				return HAND_MOTION_RANGE_CONFORM_TO_CONTROLLER;
+			default:
+				ERR_FAIL_V_MSG(HAND_MOTION_RANGE_MAX, "Unknown motion range returned by OpenXR");
+		}
+	}
+
+	return HAND_MOTION_RANGE_MAX;
+}
+
+Quaternion OpenXRInterface::get_hand_joint_rotation(Hand p_hand, HandJoints p_joint) const {
+	OpenXRHandTrackingExtension *hand_tracking_ext = OpenXRHandTrackingExtension::get_singleton();
+	if (hand_tracking_ext && hand_tracking_ext->get_active()) {
+		return hand_tracking_ext->get_hand_joint_rotation(uint32_t(p_hand), XrHandJointEXT(p_joint));
+	}
+
+	return Quaternion();
+}
+
+Vector3 OpenXRInterface::get_hand_joint_position(Hand p_hand, HandJoints p_joint) const {
+	OpenXRHandTrackingExtension *hand_tracking_ext = OpenXRHandTrackingExtension::get_singleton();
+	if (hand_tracking_ext && hand_tracking_ext->get_active()) {
+		return hand_tracking_ext->get_hand_joint_position(uint32_t(p_hand), XrHandJointEXT(p_joint));
+	}
+
+	return Vector3();
+}
+
+float OpenXRInterface::get_hand_joint_radius(Hand p_hand, HandJoints p_joint) const {
+	OpenXRHandTrackingExtension *hand_tracking_ext = OpenXRHandTrackingExtension::get_singleton();
+	if (hand_tracking_ext && hand_tracking_ext->get_active()) {
+		return hand_tracking_ext->get_hand_joint_radius(uint32_t(p_hand), XrHandJointEXT(p_joint));
+	}
+
+	return 0.0;
+}
+
+Vector3 OpenXRInterface::get_hand_joint_linear_velocity(Hand p_hand, HandJoints p_joint) const {
+	OpenXRHandTrackingExtension *hand_tracking_ext = OpenXRHandTrackingExtension::get_singleton();
+	if (hand_tracking_ext && hand_tracking_ext->get_active()) {
+		return hand_tracking_ext->get_hand_joint_linear_velocity(uint32_t(p_hand), XrHandJointEXT(p_joint));
+	}
+
+	return Vector3();
+}
+
+Vector3 OpenXRInterface::get_hand_joint_angular_velocity(Hand p_hand, HandJoints p_joint) const {
+	OpenXRHandTrackingExtension *hand_tracking_ext = OpenXRHandTrackingExtension::get_singleton();
+	if (hand_tracking_ext && hand_tracking_ext->get_active()) {
+		return hand_tracking_ext->get_hand_joint_angular_velocity(uint32_t(p_hand), XrHandJointEXT(p_joint));
+	}
+
+	return Vector3();
+}
+
 OpenXRInterface::OpenXRInterface() {
 	openxr_api = OpenXRAPI::get_singleton();
 	if (openxr_api) {
diff --git a/modules/openxr/openxr_interface.h b/modules/openxr/openxr_interface.h
index 39cc68ae9b..09e1c31728 100644
--- a/modules/openxr/openxr_interface.h
+++ b/modules/openxr/openxr_interface.h
@@ -161,8 +161,65 @@ public:
 	void on_pose_recentered();
 	void tracker_profile_changed(RID p_tracker, RID p_interaction_profile);
 
+	/** Hand tracking. */
+	enum Hand {
+		HAND_LEFT,
+		HAND_RIGHT,
+		HAND_MAX,
+	};
+
+	enum HandMotionRange {
+		HAND_MOTION_RANGE_UNOBSTRUCTED,
+		HAND_MOTION_RANGE_CONFORM_TO_CONTROLLER,
+		HAND_MOTION_RANGE_MAX
+	};
+
+	void set_motion_range(const Hand p_hand, const HandMotionRange p_motion_range);
+	HandMotionRange get_motion_range(const Hand p_hand) const;
+
+	enum HandJoints {
+		HAND_JOINT_PALM = 0,
+		HAND_JOINT_WRIST = 1,
+		HAND_JOINT_THUMB_METACARPAL = 2,
+		HAND_JOINT_THUMB_PROXIMAL = 3,
+		HAND_JOINT_THUMB_DISTAL = 4,
+		HAND_JOINT_THUMB_TIP = 5,
+		HAND_JOINT_INDEX_METACARPAL = 6,
+		HAND_JOINT_INDEX_PROXIMAL = 7,
+		HAND_JOINT_INDEX_INTERMEDIATE = 8,
+		HAND_JOINT_INDEX_DISTAL = 9,
+		HAND_JOINT_INDEX_TIP = 10,
+		HAND_JOINT_MIDDLE_METACARPAL = 11,
+		HAND_JOINT_MIDDLE_PROXIMAL = 12,
+		HAND_JOINT_MIDDLE_INTERMEDIATE = 13,
+		HAND_JOINT_MIDDLE_DISTAL = 14,
+		HAND_JOINT_MIDDLE_TIP = 15,
+		HAND_JOINT_RING_METACARPAL = 16,
+		HAND_JOINT_RING_PROXIMAL = 17,
+		HAND_JOINT_RING_INTERMEDIATE = 18,
+		HAND_JOINT_RING_DISTAL = 19,
+		HAND_JOINT_RING_TIP = 20,
+		HAND_JOINT_LITTLE_METACARPAL = 21,
+		HAND_JOINT_LITTLE_PROXIMAL = 22,
+		HAND_JOINT_LITTLE_INTERMEDIATE = 23,
+		HAND_JOINT_LITTLE_DISTAL = 24,
+		HAND_JOINT_LITTLE_TIP = 25,
+		HAND_JOINT_MAX = 26,
+	};
+
+	Quaternion get_hand_joint_rotation(Hand p_hand, HandJoints p_joint) const;
+	Vector3 get_hand_joint_position(Hand p_hand, HandJoints p_joint) const;
+	float get_hand_joint_radius(Hand p_hand, HandJoints p_joint) const;
+
+	Vector3 get_hand_joint_linear_velocity(Hand p_hand, HandJoints p_joint) const;
+	Vector3 get_hand_joint_angular_velocity(Hand p_hand, HandJoints p_joint) const;
+
 	OpenXRInterface();
 	~OpenXRInterface();
 };
 
+VARIANT_ENUM_CAST(OpenXRInterface::Hand)
+VARIANT_ENUM_CAST(OpenXRInterface::HandMotionRange)
+VARIANT_ENUM_CAST(OpenXRInterface::HandJoints)
+
 #endif // OPENXR_INTERFACE_H
diff --git a/modules/openxr/scene/openxr_hand.h b/modules/openxr/scene/openxr_hand.h
index 7bec3959d8..edfb474ac7 100644
--- a/modules/openxr/scene/openxr_hand.h
+++ b/modules/openxr/scene/openxr_hand.h
@@ -43,13 +43,13 @@ class OpenXRHand : public Node3D {
 	GDCLASS(OpenXRHand, Node3D);
 
 public:
-	enum Hands {
+	enum Hands { // Deprecated, need to change this to OpenXRInterface::Hands.
 		HAND_LEFT,
 		HAND_RIGHT,
 		HAND_MAX
 	};
 
-	enum MotionRange {
+	enum MotionRange { // Deprecated, need to change this to OpenXRInterface::HandMotionRange.
 		MOTION_RANGE_UNOBSTRUCTED,
 		MOTION_RANGE_CONFORM_TO_CONTROLLER,
 		MOTION_RANGE_MAX