BUILD-IT is a planning tool based on computer vision technology, with a capacity for complex planning and composition tasks. The system enables users, grouped around a table, to interact in a virtual scene, using physical bricks to select and manipulate virtual models. A plan view of the scene is projected onto the table. A perspective view of the scene, called side view, is projected on the wall. The plan view contains a storage space with originals, allowing users to create new models and to activate tools (e.g. navigation and height tools). Model selection is done by putting a brick at the model position. Once selected, models can be positioned, rotated and fixed by simple brick manipulation.

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