Adaptive Illumination Spherical Harmonic Coefficients Based on Wavelet Importance Prior Probability

Rendering a reality illumination is an important subject in virtual reality. Although a great progress have been made, it still needs to be developed, especially on the rendering efficiency. Illumination pre-compute technology, for example Spherical Harmonic Lighting, is powerful for rendering real-time. For the restrictions of efficiency and storage, Spherical Harmonic Lighting can capture low-frequency illumination information and miss high-frequency information. Method proposed in this paper utilize wavelet decomposition that can improve Spherical Harmonic Lighting sampling efficiency and capture more frequency illumination information.