class eradiate.scenes.illumination.DirectionalIllumination(id='illumination', zenith=<Quantity(0.0, 'degree')>, azimuth=<Quantity(0.0, 'degree')>, azimuth_convention=None, irradiance=NOTHING)[source]#

Bases: eradiate.scenes.illumination._core.Illumination

Directional illumination scene element [directional].

The illumination is oriented based on the classical angular convention used in Earth observation.

  • id (str, optional, default: "illumination") – User-defined object identifier.

  • zenith (quantity or float, default: 0.0 deg) – Zenith angle.

    Unit-enabled field (default units: ucc[angle]).

  • azimuth (quantity or float, default: 0.0 deg) – Azimuth angle value.

    Unit-enabled field (default units: ucc[angle]).

  • azimuth_convention (AzimuthConvention or str, optional, default: None) – Azimuth convention. If None, the global default configuration is used (see EradiateConfig).

  • irradiance (Spectrum or dict or float, default: SolarIrradianceSpectrum()) – Emitted power flux in the plane orthogonal to the illumination direction. Must be an irradiance spectrum (in W/m²/nm or compatible unit). Can be initialised with a dictionary processed by SpectrumFactory.convert().

  • id (str or None) – User-defined object identifier.

  • zenith (quantity) – Zenith angle.

  • azimuth (quantity) – Azimuth angle value.

  • azimuth_convention (AzimuthConvention) – Azimuth convention.

  • irradiance (Spectrum) – Emitted power flux in the plane orthogonal to the illumination direction.


Return a dictionary suitable for kernel scene configuration.


ctx (KernelDictContext) – A context data structure containing parameters relevant for kernel dictionary generation.


KernelDict – Kernel dictionary which can be loaded as a Mitsuba object.

property direction#

Illumination direction as an array of shape (3,), pointing inwards.