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We propose a new feedback technique for 3D interactionusing penumbrae which the objects cast. Rather than generatinga real penumbra, which is computationally expensive,a fast, simplified algorithm is employed, which also isbetter suited for position feedback purposes. User studiesshow that 1) compared to orthographic shadow projections,3D spatial recognition and placement tasks are substantiallyfaster with our penumbrae, and 2) the users feel the feedbackto be more natural.KEYWORDS:...

Penumbrae for 3D interactions