Three dimensional computer-generated holograms with shading effects based on a phase-only spatial light modulator

Computer holography is a highly complicated and demanding task when it comes to producing realistic three-dimensional (3D) display. We present a calculation algorithm for generating 3D computer-generated holograms (CGHs) which can produce multiple shading effects. Computer graphics rendering technique is introduced in the CGH computing, which determines the reflectance distributions of the object surface according to the lighting model. The CGHs are then generated using point source method and the intensities of the sampling points are determined by the reflectance properties. The ambient, diffuse and specular reflections are included in the calculation to produce realistic shading effects of the 3D scene. A phase-only spatial light modulator (SLM) is used to perform the optical reconstruction and the experimental results show that our proposed method can reconstruct 3D CGHs with multiple shading effects successfully.