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Engine Changes

Sackboy: A Big Adventure uses a modified version of Unreal Engine 4.25.1. The engine (on PC at least) seems to be based off Nvidia's Unreal Engine 4.25.1 RTX DLSS branch.

When DLSS 3 + Nvidia Reflex were added into the game, the modifications from Nvidia's DLSS Streamline 4.25 Engine Changes branch were added to the game.

I tried compiling my custom UE4.25.1 build with the RTX DLSS changes and used an older version of the game, but custom materials still crash the game. 馃槩

Some material domains still function, like UI and post-processing, though Volume materials won't crash but don't show. Deferred Decals will show up with no texture, and z-fight with the floor, so they are unusable.

Limitations

  • BSP Brushes will crash the game upon Sackboy stepping on them, I don't know why this happens but it does. It is best to convert all BSP brushes to Static Meshes.