Spherical Harmonic Lighting
This project is about the efficient rendering of objects under low frequency illumination by transforming the lighting into spherical harmonics. RenderManSL has been the choice of platform for the implementation.
Results of spherical harmonic lighting have been compared against standard ray-tracing in terms of both quality and efficiency. The contribution of Directional Ambient Occlusion for better image integration has been demonstrated.
Masters Project Thesis.pdf
References
Peter Pike Sloan, 'Stupid Spherical Harmonics (SH) Tricks'. GDC 2008
Ravi Ramamoorthi & Pat Hanrahan, 'An efficient representation for irradiance environment maps'. SIGGRAPH 2001
Robin Green, 'Spherical Harmonic Lighting: The Gritty Details', GDC 2003
Sponza Atrium renders. Top Left: Ray traced shadows from a spot light. Top Right: Spherical Harmonic Approximation of the same light.
The raw shadow layers. Bottom Left: Standard spot light shadows. Bottom Right: Shadows from the custom Spherical Harmonic Light.
A comparison of standard ambient occlusion with directional ambient occlusion.
An example showing the use of directional ambient occlusion for better image integration. Top Left: Original photograph. Top Right: CG Setup. Bottom Left: Composited with standard AO. Bottom Right: Composited with directional AO.
A comparison of the raw ambient occlusion layers and the render time for each of the layers
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