删减动画精度，以优化动画文件，网上已经不少文章了。写这篇时因为没有看到（可能有我没看到）有人写导入动画时自动优化，比较简单直接上代码

using UnityEngine;

using UnityEditor;

using System.Collections.Generic;

public class RemoveCurve : AssetPostprocessor

{

    // 导入模型后触发

    void OnPostprocessModel(GameObject g)

    {

        ApplyReduceFloat(g);

    }

    // 导入时自动优化动画精度

    void ApplyReduceFloat(GameObject g)

    {

        List<AnimationClip> animationClipList = new List<AnimationClip>(AnimationUtility.GetAnimationClips(g));

        if (animationClipList.Count == 0)

        {

            AnimationClip[] objectList = UnityEngine.Object.FindObjectsOfType(typeof(AnimationClip)) as AnimationClip[];

            animationClipList.AddRange(objectList);

        }

        foreach (AnimationClip theAnimation in animationClipList)

        {

            var curves = AnimationUtility.GetCurveBindings(theAnimation);

            foreach (var curveDate in curves)

            {

                var curve = AnimationUtility.GetEditorCurve(theAnimation, curveDate);

                if (curve == null || curve.keys == null)

                {

                    continue;

                }

                var keyFrames = curve.keys;

                for (var i = 0; i < keyFrames.Length; i++)

                {

                    var key = keyFrames[i];

                    key.value = float.Parse(key.value.ToString("f3"));          // 优化到3位小数，可根据自身需求调整

                    key.inTangent = float.Parse(key.inTangent.ToString("f3"));

                    key.outTangent = float.Parse(key.outTangent.ToString("f3"));

                    keyFrames[i] = key;

                }

                curve.keys = keyFrames;

                theAnimation.SetCurve(curveDate.path, curveDate.type, curveDate.propertyName, curve);

            }

        }

    }

}