It's been fascinating to see just how well Nintendo's Switch has adapted to existing engine technologies. So far we've seen the machine cope admirably with Unreal Engine 4 and Unity, and we were curious to see how the Traveller's Tales Lego engine holds up. Lego City Undercover is actually a four-year-old Wii U release, recently revamped with the latest version of the Lego engine and now available on PS4, Xbox One - and of course, Switch.
The core gameplay remains much the same as it was back in 2013 on Nintendo's last machine, but the Lego titles do feel somewhat timeless: on current-gen systems, this release still feels fun and fresh and the comedy is evergreen. From a technical perspective, Traveller's Tales and co-development studio TT Fusion might have been tempted to roll out a straight Wii U port for Switch - it's not as if we're short of them on the platform - but in fact, the latest Nintendo machine has most of the feature-set of the PS4 and Xbox One releases, with a couple of surprises in places.
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For the most part, Switch dials back on some visual elements - as you would expect from a less powerful piece of hardware. However, the developer mixes and matches level of detail settings, so while PS4 and Xbox One are typically richer from a visual perspective, there are some surprises - mesh fences draw in sooner on Nintendo's machine, for example. Then there's resolution: Switch in docked mode is a match for PlayStation 4's full 1080p (it's native 720p on the go) but curiously, the Xbox One release uses anamorphic pixels, meaning a sub-native horizontal pixel count. Resolution is only one element of a game's visual make-up - and to be clear, the Xbox release is preferable to Switch overall - but the fact that the Nintendo version is seemingly pumping out more pixels than Xbox One is something we didn't expect to see going in.
Lego City Undercover's 2017 revamp also gives us some indication of how far the engine technology has moved on in the last four years. The lighting system is completely revamped, with a move to physically-based rendering. The effect on the game is transformative in this respect, and the inclusion of more refined ambient occlusion adds subtle depths to the nooks and crannies too. The effects pipeline, the quality of the shaders, the detail in the core art assets and normal maps - everything gets a substantial upgrade. With Lego City Undercover essentially re-architected for a more modern engine, there are other enhancements too: moving out of the centre of Lego City, more of an attempt has been made to show far-off detail in the game areas.
The good news for Switch owners is that most of the upgrades bestowed by the more modern engine are all present and correct in their version of the game. Looking at the comparison footage, it's remarkable to see how well it holds up in motion next to the PS4 and Xbox One versions, with only strategic nips and tucks here and there. Some depth is lost with the removal of ambient occlusion, while shadow detail is significantly reduced (in this respect, the Switch looks closer to the original Wii U release) but this is only really an issue when viewed close-up. Reflection quality is also pulled right back on the new Nintendo machine, to the point where the effect also compares unfavourably to the original Wii U game.
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However, the reductions in quality are well handled and not overly noticeable - two more cutbacks in the visual presentation are more of an issue. Firstly, Switch has less memory onboard than its current-gen competitors, and this translates directly into some textures displayed at a lower resolution. Secondly, the developers cloud far off detail in a depth of field effect - it's a nice bokeh-like effect on PS4 and Xbox One, and this gets downgraded to more of a subtle blur on Switch. It doesn't do many favours to overall image quality, but the presentation is 'crisper' as a result with less blended detail.
Undocking the Switch from its cradle, two things become apparent: first of all, while there may be some slight tweaks to level of detail settings, the overall presentation is mostly a match for the console running at max clocks. There's a small difference in texture filtering quality, but this is more likely to be down to fewer sample points at the lower resolution as opposed to a conscious downgrade, and it's essentially invisible on the smaller screen. However, the price to pay for this level of parity is a further hit to performance - which already sees some drops from its target 30fps when the console is attached to your HDTV.