Figure 1. Dyadic projected spatial augmented reality enables two users to interact with a shared virtual scene and each other in a face to face arrangement. Center: Room geometry, user geometry and projector camera pairs are illustrated. Virtual 1 & 2: The desired view for each user is rendered offscreen. ProCam 0, 1 & 2: Projected graphics are warped to account for surface geometry, including the other user. Real 1 & 2: Each user’s resulting view compares well with the desired view (Virtual 1 & 2).