Real-time rendering of multi-perspective images for a glasses-free tabletop 3d display

Our glasses-free tabletop 3D display floats 3D images on a flat tabletop surface. It employs a conical rear-projection screen and circularly arranged projectors, and this combination generates numerous directional light rays to form virtual surfaces of 3D objects. Viewers see many rays from different projectors, so the projection images must involve multiple perspectives. Such images are generally computed by ray-tracing rendering, which ordinary graphics hardware cannot do well. This paper proposes a real-time rendering method of multi-perspective images for tabletop 3D displays. To implement it in standard rendering pipelines, our method transforms vertex coordinates based on a curved screen surface and a corresponding viewpoint to be stored by a single-perspective camera placed at any projector position. An implementation on a vertex shader generated multi-perspective images in real time whose quality equals the previous method.