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What skills does a programmer have that suddenly using BSP gives them the ability to design something that looks good that doesn’t require the skills of a 3D artist?
I don’t get how people think that 3D modeling doesn’t require 3D modeling skills and BSP will somehow avoid the need for that type of skill.
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You don’t get the difference between Lego and traditional sculpting.
You need to own 3DS or Maya, and then you need to learn it. You need to learn Blender, which for whatever reason has steeper learning curve. Where on Earth do you have time to learn everything ?!
Do you need to learn 3D modeling skills (which happen to also require UV mapping) to block out level in UE4? No, you do not. Nether did people who made Unreal, Quake, Doom, RTCW, etc. (older BSP based games). Texturing brushes doesn’t require UV mapping. So make a textures cube with 6 sides only takes so much time with BSP. It takes longer in 3D app. And once you need to adjust volume of the cube, you have to adjust UV maps in 3D app. You don’t have to with BSP brushes.
It would be more productive if you have used both, 3D app and BSP level editor. Then you’d know the difference.
On another note, it doesn’t have to be BSP brushes per se. It can be meshes (with auto UV mapping like brushes in Hammer/Radiant), but with tools like ProBuilder (and 3D grid snapping like in Trenchbroom) and decent real-time CSG inside of UE4.