I usually just make smaller prop and decor packs for Unreal, but I went for a full environment set this time. This project just kept on growing too, and ended up with more then 560 pieces.
You can find the pack here: https://www.unrealengine.com/marketplace/modular-tech-environment
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Everything was modeled in Maya, then sent to Substance Painter for the AO bake and wear generation. The first UV set is scaled consistently across all models, so you can easily swap out different textures or materials on the whole set. There are a lot of customization options and that made it pretty fun to put together in Unreal. It was like I built my own Lego set!
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You can also find it on the Unity store here: https://www.assetstore.unity3d.com/en/#!/content/107052