UCAS support

[matyalatte]

Related to #19 and #22.

Recent UE games store assets in .ucas files, not .pak
Extraction tools (e.g. FModel) can extract the assets as .uasset but they are missing some attributes that the standard uasset files have.
So, UE4 DDS Tools should be able to detect the ucas assets, and skip the missing attributes.

[Mayki07]

Hi, can I ask if there is any progress with the UCAS problem?

[matyalatte]

My first attempt for ucas/utoc support was done at 7b7f563 and 938231b.

Tested with a template project.
I replaced a normal map of a weapon with a black image, and repacked assets with UEcastoc.
Then, the game app showed a player's weapon with broken normals.

Vanilla

With broken normals

I also tested with resized textures and the force uncompressed option. They worked fine.

[Mayki07]

Will it be possible to test this version?

[matyalatte]

I'll release a preview version this weekend, but you can use the dev branch if you want to.
Here is the latest build.
UE4-DDS-Tools-29f7af7-GUI.zip

You can also folk my repo and run the building workflow to make UE4-DDS-Tools-*.zip by yourself.

Tutorial for my workflow is here.
Build-With-Github-Actions

[Mayki07]

Hi, I have tried the DEV version of your tools, I have an asset with a texture exported from a UCAS file from UE 4.27 and it works fine there. Then I have an asset with texture from UE 5.2 and it fails to export. It always ends up with an error message see screen.
The files for the test are attached.

Test file:
Robocop_Posters.zip

[matyalatte]

Thanks for the testing.
Fixed the errors at 771b353, and tested with UE4.27, 5.0, 5.2, 5.3 and 5.4.
I'll test it with 5.1 later. (I'm downloading UE5.1 now.)

Here is the latest build.
UE4-DDS-Tools-ac7b730-GUI.zip

It still fails to read your T_PoliceStation_Posters_01_a but the cause is another issue (#30.)

[matyalatte]

Tested with UE5.1. and a preview version was released as v0.6.0.
I don't close this issue becuase there might still be some problems.
I'll close it when releasing the next version.