colour.phenomena.sky_scattering_indicatrix_CIE2003#

colour.phenomena.sky_scattering_indicatrix_CIE2003(chi: ArrayLike, c: ArrayLike, d: ArrayLike, e: ArrayLike) → NDArrayFloat[source]#

Compute the CIE Standard General Sky scattering indicatrix function \(f(\chi)\) at the given angular distance \(\chi\) between a sky element and the sun.

Parameters:

  • chi (ArrayLike) – Angular distance \(\chi\) between the sky element and the sun in radians.

  • c (ArrayLike) – Indicatrix parameter \(c\).

  • d (ArrayLike) – Indicatrix parameter \(d\).

  • e (ArrayLike) – Indicatrix parameter \(e\).

Returns:

Scattering indicatrix \(f(\chi)\).

Return type:

numpy.ndarray

References

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Examples

>>> sky_scattering_indicatrix_CIE2003(
...     np.radians(30), 10, -3.0, 0.45
... )
np.float64(3.3264628...)