LevelIndex

Level scope index of this texture. It is used to reduce the amount of lookup to map a texture to its level index. Useful when building texture streaming data, as well as when filling the texture streamer with precomputed data. It relates to FStreamingTextureBuildInfo::TextureLevelIndex and also the index in [ULevel::StreamingTextureGuids](API\Runtime\Engine\Engine\ULevel\StreamingTextureGuids). Default value of -1, indicates that the texture has an unknown index (not yet processed). At level load time, -2 is also used to indicate that the texture has been processed but no entry were found in the level table. After any of these processes, the LevelIndex is reset to INDEX_NONE. Making it ready for the next level task.