Grimrock
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TF_DXT1 is a compression method.
It should be applied.
When saving as DDS, it is specified additionally.
Here they are:
Compression subsystem type: Range, Cluster, or Iterative
Compression optimization: Unified or for display
And do you need to generate Mipmaps?
Кто шарит в скриптах отпишите плиз:)