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84 行
4.1 KiB
84 行
4.1 KiB
using System.Collections.Generic;
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using UnityEngine;
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namespace UniVRM10
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{
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/// <summary>
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/// XR_EXT_hand_tracking の joint を VRM-1.0 の TPose に当てはめたときの方向を定義します。
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///
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/// * https://registry.khronos.org/OpenXR/specs/1.0/html/xrspec.html#_conventions_of_hand_joints
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/// * https://github.com/vrm-c/vrm-specification/blob/master/specification/VRMC_vrm-1.0/tpose.ja.md
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///
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/// OpenXR は右手系なのに対して Unityは左手系です。
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/// この Rig が期待するボーンの値は、XR_EXT_hand_tracking の Joint の値を Z軸反転で座標変換したものです。
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/// </summary>
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public static class XR_EXT_hand_tracking
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{
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/// <summary>
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/// up vector と forward vector の外積により空間を算出して、回転を得ます。
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/// </summary>
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/// <param name="up"></param>
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/// <param name="forward"></param>
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/// <returns></returns>
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public static Quaternion GetRotation(Vector3 up, Vector3 forward)
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{
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var xAxis = Vector3.Cross(up, forward).normalized;
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var m = new Matrix4x4(xAxis, up, forward, new Vector4(0, 0, 0, 1));
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return m.rotation;
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}
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public static Quaternion LeftHand = GetRotation(Vector3.up, Vector3.left);
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public static Quaternion RightHand = GetRotation(Vector3.up, Vector3.right);
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/// <summary>
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/// 親指は XZ 平面45度です。
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/// </summary>
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public static Quaternion LeftThumb = GetRotation((Vector3.forward + Vector3.right).normalized, (Vector3.left + Vector3.forward).normalized);
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/// <summary>
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/// 親指は XZ 平面45度です。
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/// </summary>
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public static Quaternion RightThumb = GetRotation((Vector3.forward + Vector3.left).normalized, (Vector3.right + Vector3.forward).normalized);
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/// <summary>
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/// VRM-1.0 の T-Pose の定義から各指はX軸と並行です。親指はXZ平面に45度です。
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/// </summary>
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public static IReadOnlyDictionary<HumanBodyBones, Quaternion> InitialRotations => new Dictionary<HumanBodyBones, Quaternion>()
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{
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// Left
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{HumanBodyBones.LeftHand, LeftHand},
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{HumanBodyBones.LeftThumbProximal, LeftThumb},
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{HumanBodyBones.LeftThumbIntermediate, LeftThumb},
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{HumanBodyBones.LeftThumbDistal, LeftThumb},
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{HumanBodyBones.LeftIndexProximal, LeftHand},
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{HumanBodyBones.LeftIndexIntermediate, LeftHand},
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{HumanBodyBones.LeftIndexDistal, LeftHand},
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{HumanBodyBones.LeftMiddleProximal, LeftHand},
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{HumanBodyBones.LeftMiddleIntermediate, LeftHand},
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{HumanBodyBones.LeftMiddleDistal, LeftHand},
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{HumanBodyBones.LeftRingProximal, LeftHand},
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{HumanBodyBones.LeftRingIntermediate, LeftHand},
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{HumanBodyBones.LeftRingDistal, LeftHand},
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{HumanBodyBones.LeftLittleProximal, LeftHand},
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{HumanBodyBones.LeftLittleIntermediate, LeftHand},
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{HumanBodyBones.LeftLittleDistal, LeftHand},
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// Right
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{HumanBodyBones.RightHand, RightHand},
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{HumanBodyBones.RightThumbProximal, RightThumb},
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{HumanBodyBones.RightThumbIntermediate, RightThumb},
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{HumanBodyBones.RightThumbDistal, RightThumb},
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{HumanBodyBones.RightIndexProximal, RightHand},
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{HumanBodyBones.RightIndexIntermediate, RightHand},
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{HumanBodyBones.RightIndexDistal, RightHand},
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{HumanBodyBones.RightMiddleProximal, RightHand},
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{HumanBodyBones.RightMiddleIntermediate, RightHand},
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{HumanBodyBones.RightMiddleDistal, RightHand},
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{HumanBodyBones.RightRingProximal, RightHand},
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{HumanBodyBones.RightRingIntermediate, RightHand},
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{HumanBodyBones.RightRingDistal, RightHand},
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{HumanBodyBones.RightLittleProximal, RightHand},
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{HumanBodyBones.RightLittleIntermediate, RightHand},
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{HumanBodyBones.RightLittleDistal, RightHand},
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};
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}
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}
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