Adding a solar-radiance function to the Hošek-Wilkie skylight model

Area of Science:

• Computer Graphics
• Atmospheric Optics

Background:

• Realistic outdoor scene rendering requires accurate sky appearance simulation.
• Current methods like captured luminance patterns and analytical sky-dome models have limitations.
• Existing analytical models often exclude the solar disc or use formulas that don't perfectly align with the sky model.

Purpose of the Study:

• To propose a novel solar-radiance function for computer graphics.
• To ensure the solar radiance function precisely matches a high-quality analytical skylight model.
• To enhance the accuracy and realism of outdoor scene renderings.

Main Methods:

• Development of a new analytical solar-radiance function.
• Integration of the new function with a recently published high-quality analytical skylight model.
• Mathematical derivation to ensure exact matching conditions between solar radiance and skylight.

Main Results:

• A solar-radiance function that exactly matches the conditions of a sophisticated analytical skylight model.
• Improved consistency between the simulated solar disc and the surrounding skylight.
• Potential for more physically accurate and visually convincing outdoor scene renderings.

Conclusions:

• The proposed solar-radiance function addresses limitations in current computer graphics sky rendering.
• Precise matching of solar radiance to skylight models is crucial for advanced rendering.
• This advancement contributes to more realistic digital representations of outdoor environments.