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but as far as I know it can also create Level Geometry
so why not build parts of the level with it that would be impossible or hard in WED?
And the texturing is way easier when you see the lighting directly!



As fas as I know this editor can only load up wmb entities which means precompiled level parts that are prelighted in wed with static lights. You can not make wed block with this editor, neither place static lights since you would have to compile the whole level again. So you can not texture wed blocks with this editor either... This editor mainly concentrates on models and runtime enveronments.