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How do you make CLEAN, curvy surfaces that don't screw up the BSP? ...such as the Curvy arches in de_dust, and the street corners in HL2 Singleplayer?

I have a train tunnel with a curvy interior roof, but the BSP is all subdivided to the crapper. How on earth do you get a CLEAN arched ceiling? The Valve-made curvy brushes are perplexing, and I have no idea how they made them. I understand convex curves (outward), but not concave (inward).
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