Wang F, Blinder D, Udjaja Y, Ito T, Shimobaba T. Viewpoint-dependent lighting on polygonal holograms using bump mapping.
OPTICS LETTERS 2024;
49:5180-5183. [PMID:
39270265 DOI:
10.1364/ol.530394]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Accepted: 08/08/2024] [Indexed: 09/15/2024]
Abstract
Holograms can be observed from different viewpoints, because light waves can be encoded to propagate in multiple directions. Thus, accurate holograms for 3D display should model viewpoint-dependent light reflections. We proposed a new, to the best of our knowledge, hologram generation method for objects represented by polygonal meshes, whose lighting changes as the viewer moves, all while rendering smooth shading using low-poly objects. The proposed method leverages bump mapping and converts it into a bump-phase map encoding the propagation frequency and then spreads the reflected light wave so that only a specific viewpoint can receive them. Simulation experiments with small pixel pitches confirm the method's high computational performance.
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