Military training instructors increasingly often employ computer games to train soldiers in all sorts of skills and tactics. One\r\nof the difficulties instructors face when using games as a training tool is the creation of suitable content, including scenarios,\r\nentities, and corresponding terrain models. Terrain plays a key role in many military training games, as for example, in our case\r\ngame Tactical Air Defense. However, current manual terrain editors are both too complex and too time-consuming to be useful\r\nfor instructors; automatic terrain generation methods show a lot of potential, but still lack user control and intuitive editing\r\ncapabilities. We present a novel way for instructors to model terrain for their training games: instead of constructing a terrain\r\nmodel using complex modeling tools, instructors can declare the required properties of their terrain using an advanced sketching\r\ninterface. Our framework integrates terrain generation methods and manages dependencies between terrain features in order to\r\nautomatically create a complete 3D terrain model that matches the sketch. With our framework, instructors can easily design a\r\nlarge variety of terrain models that meet their training requirements.
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