PackedAssets

Description

An extension to the BuildReport class that tracks how Assets contribute to the size of the build.

The build process generates a PackedAssets object for each Serialized File, resS and resource file generated by a build. Serialized Files contain serialized Unity Objects from scenes and assets.

The PackedAsset information can be used to analyze what content contributes to the size of each file in the build, for example to calculate the total size of all textures.

Note: For large builds the PackedAsset objects can grow very large, and consume a significant amount of memory. The ContentSummary is a compact representation that can be used as a more efficient alternative to the PackedAssets structure in many cases.

Example file names for Serialized Files in the output of a Player build are level0, level1, resources.assets, sharedassets0.assets and globalgamemanagers.assets. Note: there is no PackedAsset object generated for the globalgamemanager file.

AssetBundles that contain assets have a single serialized file, with a name like CAB-b8befc517982290c55526f35cbb7f03d. AssetBundles that contain scenes have multiple serialized files.

The BuildReport created for ContentDirectory builds does not include PackedAssets.

The PackedAssets for a Serialized File records the size of the header and metadata section in the overhead property, and then information about each object in the contents property.

Files with the .resource extension contain audio or video data that is referenced by an AudioClip or VideoClip object inside the associated Serialized File. For example level1.resource contains audio and video data from objects inside the Serialized File level1. The PackedAsset for a .resource file records information about the originating asset for each blob of audio or video data in the .resource file.

Similarly, the PackedAsset object for a .resS file records information about the size and origin of Texture and Mesh data inside the file.

Additional resources: PackedAssetInfo, ContentSummary

using UnityEngine;
using UnityEditor;
using UnityEditor.Build.Reporting;
using System.Text;

public class BuildReportPackedAssetsExample
{
    [MenuItem("Example/Show PackedAssets from Latest Build")]
    static public void ShowPackedAssets()
    {
        var buildReport = BuildReport.GetLatestReport();

        if (buildReport == null)
        {
            Debug.Log("Please run a Player or AssetBundle build, then try again");
            return;
        }

        var sb = new StringBuilder();
        var packedAssets = buildReport.packedAssets;

        sb.AppendLine("Packed Assets:");
        foreach (var packedAsset in buildReport.packedAssets)
        {
            var packedAssetInfoArray = packedAsset.contents;
            sb.AppendLine($"  {packedAsset.shortPath} Item count: {packedAssetInfoArray.Length}");
        }

        //Example output:

        //Packed Assets:
        //  globalgamemanagers.assets Item count: 11
        //  resources.assets Item count: 2
        // etc.
        Debug.Log(sb.ToString());
    }
}

Properties

Inherited Members