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Unity Engine

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Unity Engine

Analyzing AssetBundles

Inspect an analyze the structure of AssetBundles with Unity's analysis tools.
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Unity provides several tools to inspect the internal structure and contents of AssetBundles to help with troubleshooting.

WebExtract and binary2text

WebExtract and binary2text are low-level command-line tools included with every Unity Editor installation.
  • WebExtract
    : Extracts the files embedded within an AssetBundle, similar to unzipping an archive. It creates a folder (named after the AssetBundle) containing its internal files in the same directory as the AssetBundle.
  • binary2text
    : Converts a binary 
    SerializedFile
    (the core Unity data format) into a human-readable text format, similar to Unity's YAML format.
You can also use UnityDataTools, which is an alternative to the WebExtract and binary2text tools.
For more information, refer to Analyze built assets.

BuildReport

The 
BuildReport
file (located at 
Library/LastBuild.buildreport
in your project directory) is a Unity 
SerializedFile
that records the content of each AssetBundle. This 
SerializedFile
contains detailed information about the build, including timings for build steps and a granular view of AssetBundle contents. You can view this file in the following ways:
  • Build Report Inspector: Use the Build Report Inspector package to view the 
    BuildReport
    contents within the Editor.
  • Project Auditor: Project Auditor can view 
    BuildReports
    , but might struggle with large builds that involve many objects.
  • Programmatic Access: Use 
    BuildReport
     to access to the data within the 
    BuildReport
    file.
  • Text Format: Enable Preferences > Diagnostics > BuildReportingEditor > SerializeBuildReportAsText to output the 
    BuildReport
    directly as YAML text.

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