Under the Hood: Parallax Interiors

When driving through a virtual city, the details make all the difference in making it feel alive and immersive. One of our latest additions to our truck simulation titles is the introduction of Parallax Interiors, an innovative way to render detailed interiors through windows using a clever illusion. This enhances the visual depth of buildings in Euro Truck Simulator 2 and American Truck Simulator, which you may have already spotted in recent releases such as the Greece DLC or our Return to Winterland World of Trucks event.

Today, we’re going Under the Hood on the process behind Parallax Interiors and exploring the research, development, and implementation that made this feature possible. We spoke with some members of the team behind this project. We will let them introduce themselves!

“Hi, my name is Sasha, and I work in the asset department of ETS2. My main focus is developing methodologies for solving various visual challenges. I collaborate with other departments on art-related tasks and occasionally take on different roles across various projects. During the development of parallax, I took on a role somewhere between an art lead and a project manager, helping to shape the process and guide the team.”

“Hi there, my name is Jan V. and my work at SCS for the last five years has mainly comprised high-level graphics programming with the occasional venture into internal tools development; more specifically, most of my tasks involve either researching and implementing new graphics features or improving existing ones, be it model materials or post-processing effects.”

“Hi, my name is Yurii H., and I joined the SCS Software team almost 3 years ago. I work as a 3D designer on the ETS Assets team. Over the past year, I've been focusing on specific tasks such as creating new menu scenes, working on the parallax project, and improving the interiors of assets.”

“Hi, I am Martin Č, I’ve been working as a tools programmer at SCS for over 5 years now. During that time, I’ve been mainly focused on supporting our artists by creating specialized tools in Maya and managing our asset pipeline with my colleague and good friend Petr B. One of these specialized tools was our so-called “Interior Window Tool” which allows artists to apply our new parallax interior shader to assets."

The Vision Behind Parallax Interiors

What was the motivation behind creating these new Parallax Interiors? “The idea came from one of our colleagues, Wave, who was inspired by how other games, such as Forza, implemented a similar technology.” Sasha tells us “He built the first prototype, proving that this approach could work within our games. From there, we refined the process and expanded it into a full-fledged feature, so big kudos to him for that!”

“It is commonly said that real-time computer graphics is all smoke and mirrors. Whenever we see an opportunity to improve our visuals on a mass scale without having to necessarily compromise on performance, we deem it especially worth looking into.” Jan V explains, “Seeing as we are far from the only developers out there building a virtual world closely modelled after reality, noticing similar tech being widely adopted with impressive results in other games provided us with the inspiration necessary to decide on adapting it ourselves, perhaps even coming up with new improvements to the technique as a result.”

“Having a straightforward, universal way of both creating and rendering realistic-looking building interiors would hopefully enable us to save time on both the asset