BSP Clip Tool not working?

remisalomon
Mon, 21 Jul 2025 13:16:55 +0000
World Creation

Hey! I’m relatively new to the latest version of Unreal and am used to work with BSP on older versions / other editors (Hammer/Trenchbroom).

I’m very confused about the use of the clip tool, and can’t make it work for the life of me. I understood you must be used in orthographic view, and I understood how to add the clip markers (you must press [space] when the tool is selected). But every time I try to clip a brush, I get an error message:

Modifier (Clip) : Unable to compute normal for brush clip!

As for the complexity of the brush, we can’t go lower, because I simply try to split a box in half. I also tried to toggle the ‘Flip Normals’ and ‘Split’ settings, same result!

Anyone could help please? Cheers!

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