illumination
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Defined in: eclipse.rs:66
fn illumination(observer_pos: &nalgebra::Vector3<f64>, light_pos: &nalgebra::Vector3<f64>, occulter_pos: &nalgebra::Vector3<f64>, light_radius: f64, occulter_radius: f64, model: ShadowModel) -> f64
Compute the illumination fraction at observer_pos.
All positions must be in the same coordinate frame and units (km).
Returns a value in [0.0, 1.0]:
- 1.0 = fully sunlit (no eclipse)
- 0.0 = total eclipse (umbra)
- intermediate = partial eclipse (penumbra or annular)
Arguments
Section titled “Arguments”observer_pos— position of the observer (e.g. satellite)light_pos— position of the light source (e.g. Sun)occulter_pos— position of the occulting body (e.g. Earth)light_radius— radius of the light source [km]occulter_radius— radius of the occulting body [km]model— shadow model to use