They used the power of UE4 mixed in with some general gaming development tricks. Ultimately, UE4 is really well made and runs smooth on consoles and PC. I’ve played a couple of UE4 games with little to no frame drop like i get with other games with proprietary engines.
I’m still learning more about game development.
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You can have about 100 Skeletal Meshes as long as their mesh is low-poly enough.
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I had a game that had up to 200 pawns walking around with no issue.
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Post process is great and I think it’s cheap to use. You can get a lot of mileage out of it.
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The game isn’t open world
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This means your draw distance is low and you have to render a lot less meaning you can pack more into what the player sees.