Unity - Mesh、Animation Compress of the Model - 模型的网格、动画压缩，减少包体大小

将 .fbx 放到 Assets

网格信息 face

375 顶点，638 面

body

6529 顶点，9381 面

hair

2234 顶点，3162 面

weapon

176 顶点，132 面

skin

1053 顶顶啊，1518 面

压缩选

• fbx 的 Animation->Anim.Compression : Off
• fbx 的 Model->Mesh Compression : Off
• fbx AnimationClip 的 keyframe 精度

Animation->Anim.Compression : Optimal

将 Anim.Compression 由 Off 调整为：Optimal Rotation/Position/Scale Error 的各个容差都使用默认值：0.5

打包 AB 大小

单单一个：Anim.Compression : Off 到 Optimal, Errors : 0.5 然后压缩大小从：6.54 mb -> 1.64 mb

Model->Mesh.Compression : Optimal

将 Mesh.Compression 由 Off 调整为：High

打包 AB 大小

单单一个：Mesh Compression : Off 到 High 然后压缩大小从：1.64 mb -> 1.42 mb

AnimationClip 精度压缩

其实只保留了 2~3 位精度，原来的精度有：7位小数，我们将其压缩到 f2 ： 2两个精度

可以看到调整变换：0.7071068 -> 071

AnimationClip 丢弃不必要的变化曲线

一般我们的动画中都是 位移、旋转比较多，缩放比较少，所以一般情况下，确定没使用到缩放的，可以直接删掉

    public static void CompressAnimationClip(AnimationClip clip)
    {
        var editorCurves = AnimationUtility.GetCurveBindings(clip);
        if (editorCurves != null)
        {
            foreach (EditorCurveBinding editorCurve in editorCurves)
            {
                string name = editorCurve.propertyName.ToLower();
                if (name.Contains("scale"))
                {
                    AnimationUtility.SetEditorCurve(clip, editorCurve, null);
                }
            }
        }
        ...
    }

CSharp 脚本 - ModelPreprocessor.cs

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

public class ModelPreprocessor : AssetPostprocessor
{
    public void OnPreprocessModel()
    {
        //Debug.Log("ModelPreprocessor.OnPreprocessModel");

        ModelImporter modelImporter = (ModelImporter)assetImporter;
        modelImporter.animationCompression = ModelImporterAnimationCompression.Optimal;
        modelImporter.meshCompression = ModelImporterMeshCompression.High;
    }

    public void OnPostprocessAnimation(GameObject go, AnimationClip clip)
    {
        try
        {
            CompressAnimationClip(clip);
        }
        catch (System.Exception e)
        {
            Debug.LogError("CompressAnimationClip Failed !!! animationPath :" + assetPath + "error: " + e);
        }
    }
    public static void CompressAnimationClip(AnimationClip clip)
    {
        var editorCurves = AnimationUtility.GetCurveBindings(clip);
        if (editorCurves != null)
        {
            foreach (EditorCurveBinding editorCurve in editorCurves)
            {
                string name = editorCurve.propertyName.ToLower();
                if (name.Contains("scale"))
                {
                    AnimationUtility.SetEditorCurve(clip, editorCurve, null);
                }
            }
        }

        string format = "f4";
        AnimationClipCurveData[] curves = AnimationUtility.GetAllCurves(clip);
        for (int ii = 0; ii  1.64 mb-> 1.42 mb -> 1.10 mb
 
 
测试打包 AB 资源的 CSharp 脚本 : BuildFbxToABEditor.cs 
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEditor;
using UnityEngine;

public static class BuildFbxToABEditor
{
    [MenuItem("Tools/BuildSelectionToAB")]
    private static void BuildSelectionToAB()
    {
        Debug.Log("BuildSelectionToAB START.");

        var objs = Selection.objects;
        if (objs == null || objs.Length == 0)
        {
            Debug.Log($"Selection.objects.Length : {objs.Length}, u have no selections.");
            return;
        }

        var ab_build_infos = new AssetBundleBuild[objs.Length];

        for (int i = 0; i