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89 行
4.4 KiB
89 行
4.4 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_FB_body_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://developer.oculus.com/documentation/native/android/move-ref-body-joints/
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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_FB_body_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_FB_body_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="yAxis"></param>
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/// <param name="zAxis"></param>
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/// <returns></returns>
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public static Quaternion GetRotation(Vector3 yAxis, Vector3 zAxis)
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{
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var xAxis = Vector3.Cross(yAxis, zAxis).normalized;
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var m = new Matrix4x4(xAxis, yAxis, zAxis, new Vector4(0, 0, 0, 1));
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return m.rotation;
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}
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public static Quaternion Spine = GetRotation(Vector3.forward, Vector3.left);
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public static Quaternion Left = GetRotation(Vector3.forward, Vector3.down);
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public static Quaternion LeftThumb = GetRotation((Vector3.left + Vector3.back).normalized, Vector3.up);
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public static Quaternion LeftHand = GetRotation(Vector3.down, Vector3.back);
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public static Quaternion Right = GetRotation(Vector3.back, Vector3.up);
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public static Quaternion RightThumb = GetRotation((Vector3.left + Vector3.forward).normalized, Vector3.down);
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public static Quaternion RightHand = GetRotation(Vector3.up, Vector3.forward);
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public static IReadOnlyDictionary<HumanBodyBones, Quaternion> InitialRotations => new Dictionary<HumanBodyBones, Quaternion>()
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{
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{HumanBodyBones.Hips, Spine},
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{HumanBodyBones.Spine, Spine},
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{HumanBodyBones.Chest, Spine},
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{HumanBodyBones.UpperChest, Spine},
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{HumanBodyBones.Neck, Spine},
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{HumanBodyBones.Head, Spine},
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{HumanBodyBones.LeftShoulder, Left},
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{HumanBodyBones.LeftUpperArm, Left},
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{HumanBodyBones.LeftLowerArm, Left},
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{HumanBodyBones.RightShoulder, Right},
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{HumanBodyBones.RightUpperArm, Right},
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{HumanBodyBones.RightLowerArm, Right},
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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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