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OnPostprocessTexture isn't called when the asset matches a version that was previously imported

Asset - Importers


OnPostprocessTexture isn't always called

When a texture asset is modified, OnPostprocessAllAssets is always called when focussing the editor. However, OnPostprocessTexture isn't always called, sometimes it is, sometimes it isn't.

Repro steps:
1. Have an AssetPostprocessor that logs OnPostprocessAllAssets and OnPostprocessTexture.
2. Modify a texture asset externally.
3. Switch back to Unity (alt-tab or with mouse).
4. Repeat steps 2 and 3 as necessary.

Expected behavior: Both OnPostprocessAllAssets and OnPostprocessTexture should be called
Observed behavior: OnPostprocessAllAssets is always called, but OnPostprocessTexture isn't always called

The project in this report contains a postprocessor and an image which can be used to go through the repro steps.

Reproducible: 2019.3.0f5, 2020.1.0a19
Not repro: 2018.4.14f1, 2017.4.35f1,

  1. Resolution Note (2020.1.X):

    If a post-processor is modifying the asset or creating additional artifacts, that modification will be saved and any additional artifacts are now saved in a local cache (until the editor is closed), so re-running the post-processor should not be needed.
    This was also the case even before 2019.3 when using the cache server.

    If some post-processors are depending on this callback to do some side-effects, it's actually wrong because importers should ideally not have side-effects and those would be anyway impacted in the future by running imports on a separate worker process, for example.

    OnPostprocessAllAssets runs on the main thread and is always called, so that would be the place for side-effects to be executed.

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