1 files changed, 54 insertions, 0 deletions
diff --git a/Assets/Tools/RootMotion/RootMotionData.cs b/Assets/Tools/RootMotion/RootMotionData.cs
new file mode 100644
index 00000000..f60689ad
--- /dev/null
+++ b/Assets/Tools/RootMotion/RootMotionData.cs
@@ -0,0 +1,54 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[CreateAssetMenu(fileName = "RootMotion Data")]
+// 单个动画的root motion
+public class RootMotionData : ScriptableObject
+{
+    public string animationName;
+
+    public int frameCount;
+
+    public List<Vector3> positionList;
+
+    public float animationLength;
+
+    public float fps;
+
+    public Vector3 GetRootMotion(float normalTime)
+    {
+        normalTime = Mathf.Clamp(normalTime, 0, 1);
+        int prevFrame = (int)Mathf.Floor((frameCount - 1) * normalTime) % frameCount;
+        int nextFrame = (int)Mathf.Ceil((frameCount - 1) * normalTime) % frameCount;
+        float frameRate = 1 / fps;
+        float t = (normalTime * animationLength - prevFrame * frameRate) / frameRate;
+        return Vector3.Lerp(positionList[prevFrame], positionList[nextFrame], t);
+    }
+
+    /// <summary>
+    /// 返回移动量，加到当前position上
+    /// </summary>
+    /// <param name="prevTime">上一次计算root motion的单位时间</param>
+    /// <param name="curTime">本次取root motion的时间</param>
+    /// <returns></returns>
+    public Vector3 GetRootMotionDistance(float prevTime,  float curTime)
+    {
+        Vector3 p1 = GetRootMotion(prevTime);
+        Vector3 p2 = GetRootMotion(curTime);
+        return p2 - p1;
+    }
+
+}
+
+public static class RootMotionUtility
+{
+	// zy平面的移动改为xy平面的移动
+	public static Vector3 ExchangeXZ(Vector3 dest)
+	{
+		float z = dest.z;
+		dest.z = dest.x;
+		dest.x = z;
+		return dest;
+	}
+}