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Propper is an add-on for Valve Hammer Editor that can convert any map geometry into a Source model, suitable for static props and physics props.
Propper is an edited version of vbsp that outputs a model instead of a bsp.
Many mappers need to make props for their maps, but don't want or dont have time to learn a separate modeling program. This tool allows them to make models in Hammer in a one-step process. It's also useful to modelers who work with mappers. Propper keeps texture mapping intact, and auto-generates a physics mesh.