Generates spherical harmonics information based on the light’s photometry data.
- iOS 9.0+
- macOS 10.11+
- tvOS 9.0+
- Model I/O
The number of levels for which to generate spherical harmonics. Each level of spherical harmonics contains more coefficients, affecting both the layout of the resulting data and the detail of any lighting effects based on it.
Spherical harmonic coefficients describe the distribution of light around a light source with less high-frequency detail than a cube map texture, but they can be used more efficiently in real-time rendering. After calling this method, use the
spherical property to access the generated coefficients.