Under The Hood: Cargo System Redefined

Today, we are happy to take you for another look Under the Hood! This time, we bring you an interview with some of the members of our team who are working on the redefined cargo system for both ETS2 and ATS in the upcoming 1.54 update. So without further delay, we'll let the experts explain what this new system is all about and take you behind the scenes of their work!

As our games continue to expand, the number of cargo types and trailers has grown significantly, making the old system increasingly difficult to manage. To understand why a change was necessary, it helps to look at how the previous system worked.

Until now, what seemed like the game combining a trailer with cargo, such as a piece of machinery, was actually a manually created model, with each trailer-cargo pair stored separately on disk. This approach required an enormous number of unique models, making it harder to add new content efficiently and taking up disk space.

Programmer Simon, also known as 50keda, who worked on this task from the very beginning, explains this in more depth.

"In our world, every cargo must be attached to a trailer in some way. The way cargo is visually linked to the trailer, including the chosen model for loading, is part of what we call the cargo system. This system manages how visual models of cargo are connected to the appropriate trailers, playing a role in the broader economy. As our projects expanded, the number of cargo and trailers increased to the point where the older approach became unsustainable. Managing the growing combinations of trailers and cargo became overwhelming, leading to longer release times and affecting the order in which new cargo and trailers could be integrated," he shares with us.

Smety, our Senior Vehicle Artist explains that this issue has been a growing problem for some time and needed solving. "Things were getting complicated with the arrival of new cargo and a lot of new branded trailers to the game. Each cargo was attached to all trailers of that type, meaning if we had 3 flatbeds, we also needed 3 specific cargo models - and every cargo variant usually has two or three visuals. Plus, we have branded trailers so the combinations were reaching huge numbers. I had the task of reworking the trailers."

Our goal was to simplify the process of connecting new cargo and trailers, eliminating the need to manually manage their combinations, as Simon explains here: "We could achieve this by having the code automatically merge cargo and trailers based on simplified rules, rather than creating separate models for each trailer type. This means that each cargo will define its own model, loading methodology, and lashing method. While this approach may have some initial challenges and might not be perfect at first, it lays the foundation for future expansion and improvement. For example, when loading cargo programmatically - such as a pallet - you will only need to model a single pallet. The code will then determine the correct number of models and position them on the trailer according to the chosen loading methodology."

So the new system's biggest advantage is that it no longer requires our 3D artists to manually create pre-baked trailer-cargo pairs. Instead, it dynamically matches any compatible trailer with any compatible cargo, procedurally decides its placement and generates believable lashing elements which will make the work of our vehicle team much easier.

Our producer, Karel, coordinated the project and played a key role