3fc97a3ed4
This fixes an issue where a CacheFile was always created for the USD file, causing USD_create_handle() to be called unnecessarily even if the USD does not have animating meshes or transforms. This bug would sometimes result in the stage remaining open in a CacheArchiveHandle after import (because the CacheFile is never freed), preventing the USD from being reloaded from disk. The cache file is now accessible to readers through an ImportSettings::get_cache_file function wrapper which creates a CacheFile as needed, the first time the function is called. The allocated CacheFile pointer is now stored in a new ImportJobData::cache_file member. Pull Request: https://projects.blender.org/blender/blender/pulls/116242
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