Trenchbroom and Quake: Building with Curves and Extrusion

I forgot to mention, use Valve Texture Mode when starting your maps! I used the default idbase textures for this video, which are little suboptimal in parts, but I'm more concerned with just demonstrating the building technique. Be sure to snap your vertices to integer if you work with these curved pieces! Default hotkey is Ctrl + Shift + V
Hotkeys:
Apply Texture with Deformation: Shift + Alt + Left Click Drag
Extrude: Ctrl + Shift + Left Click Drag
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