Got actual solar spectrum data and incorporated it. Plus radiometry

crates/resolved/src/camera.rs

@@ -72,7 +72,7 @@ impl CameraConfig {
     ///   80 nm wide at half maximum, with 60 % peak QE.
     /// - 20,000 electron full well, 12-bit ADC, 5 electrons per DN, 64 DN bias.
     /// - 0.1 ms exposure: a white Lambertian surface facing the Sun fills about half the
-    ///   well (44-54 % across the channels), so Earth and the target are both unsaturated.
+    ///   well (48-57 % across the channels), so Earth and the target are both unsaturated.
     /// - Mounted with no offset or rotation on the observer.
     pub fn example() -> Self {
         let channel = |name: &str, center: f64| Channel {

crates/resolved/src/lib.rs

@@ -15,10 +15,13 @@ pub use nalgebra;
 
 pub mod camera;
 pub mod error;
+pub mod radiometry;
 pub mod scene;
+mod solar_data;
 pub mod spectrum;
 
 pub use camera::{CameraConfig, Channel, Detector, Intrinsics};
 pub use error::Error;
+pub use radiometry::Radiometry;
 pub use scene::{CameraRelative, Placement, Pose, Scene, Target};
 pub use spectrum::Spectrum;

crates/resolved/src/radiometry.rs

@@ -0,0 +1,247 @@
+//! Sunlight, and the per-channel constants the GPU shades with.
+//!
+//! Spectra are folded into a few numbers per channel once, when a camera is set up, so
+//! the GPU never integrates over wavelength. The unit that makes this work is the
+//! channel radiance of a channel k:
+//!
+//! ```text
+//! L_k = ∫ L(λ) τ(λ) QE_k(λ) λ / (h c) dλ        [electrons / s / m^2 / sr]
+//! ```
+//!
+//! It is scene radiance as this camera's channel sees it: weighted by the optics
+//! transmission and QE, and counted in photons rather than watts. Electrons follow from
+//! it by geometry alone (see [`Radiometry::electrons`]). The approximation is that a
+//! surface's reflectance is treated as constant across each channel's band once it is
+//! reduced to an [effective albedo](Radiometry::effective_albedo); `docs/optics.md`
+//! explains when that matters.
+
+use std::sync::OnceLock;
+
+use crate::camera::CameraConfig;
+use crate::solar_data;
+use crate::spectrum::Spectrum;
+
+/// The astronomical unit, in meters (IAU 2012, exact).
+pub const AU: f64 = 149_597_870_700.0;
+/// Nominal solar radius, in meters (IAU 2015 Resolution B3).
+pub const SUN_RADIUS: f64 = 6.957e8;
+/// Planck constant, in J s (SI, exact).
+pub const PLANCK: f64 = 6.626_070_15e-34;
+/// Speed of light in vacuum, in m/s (SI, exact).
+pub const SPEED_OF_LIGHT: f64 = 299_792_458.0;
+
+/// Solar spectral irradiance at 1 AU, in W/m^2 per meter of wavelength.
+///
+/// The TSIS-1 Hybrid Solar Reference Spectrum at 1 nm resolution, 202 to 2730 nm
+/// (Coddington et al. 2021, <https://doi.org/10.1029/2020GL091709>), compiled in from
+/// `solar_data.rs`, which `scripts/fetch-solar-spectrum.sh` generates. It integrates to
+/// 1325.8 W/m^2; the remaining ~35 W/m^2 of the 1361 W/m^2 total lies outside that range,
+/// where silicon detectors do not respond.
+pub fn solar_spectrum() -> &'static Spectrum {
+    static SPECTRUM: OnceLock<Spectrum> = OnceLock::new();
+    SPECTRUM.get_or_init(|| Spectrum::from_static(&solar_data::WAVELENGTH, &solar_data::IRRADIANCE))
+}
+
+/// The solid angle of the solar disk seen from 1 AU, in steradians.
+pub fn sun_solid_angle_at_1au() -> f64 {
+    let sin = SUN_RADIUS / AU;
+    2.0 * std::f64::consts::PI * (1.0 - (1.0 - sin * sin).sqrt())
+}
+
+/// The integral over wavelength of the product of `spectra`.
+///
+/// The integral runs over the range where every sampled spectrum is defined, using the
+/// trapezoid rule on the union of their sample wavelengths. Returns `None` if every
+/// spectrum is constant, since the integral then has no bound.
+pub fn integrate(spectra: &[&Spectrum]) -> Option<f64> {
+    integrate_weighted(spectra, |_| 1.0)
+}
+
+fn integrate_weighted(spectra: &[&Spectrum], weight: impl Fn(f64) -> f64) -> Option<f64> {
+    let (lo, hi) = spectra
+        .iter()
+        .filter_map(|s| s.support())
+        .reduce(|(a, b), (c, d)| (a.max(c), b.min(d)))?;
+    if lo >= hi {
+        return Some(0.0);
+    }
+    let mut grid: Vec<f64> = spectra
+        .iter()
+        .flat_map(|s| s.breakpoints())
+        .copied()
+        .filter(|&l| l > lo && l < hi)
+        .chain([lo, hi])
+        .collect();
+    grid.sort_by(f64::total_cmp);
+    grid.dedup();
+    let f = |l: f64| weight(l) * spectra.iter().map(|s| s.at(l)).product::<f64>();
+    Some(
+        grid.windows(2)
+            .map(|w| 0.5 * (f(w[0]) + f(w[1])) * (w[1] - w[0]))
+            .sum(),
+    )
+}
+
+/// A camera's per-channel radiometric constants.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Radiometry {
+    /// Per channel: the electron rate per square meter of detector that 1 AU sunlight
+    /// would produce falling directly on it through the optics,
+    /// `∫ E_sun τ QE_k λ / (h c) dλ`, in electrons / s / m^2.
+    pub solar_flux: Vec<f64>,
+    /// Electrons per unit channel radiance at the image center:
+    /// `π A t / (4 N^2)`, in m^2 sr s, for pixel area A and exposure t.
+    pub electrons_per_radiance: f64,
+    /// The camera's transmission and QE, kept to compute effective albedos.
+    response: Vec<Spectrum>,
+    transmission: Spectrum,
+}
+
+impl Radiometry {
+    /// Folds the solar spectrum through `camera`'s optics and channels.
+    pub fn new(camera: &CameraConfig) -> Self {
+        let photons = |l: f64| l / (PLANCK * SPEED_OF_LIGHT);
+        let solar_flux = camera
+            .channels
+            .iter()
+            .map(|ch| {
+                let spectra = [
+                    solar_spectrum(),
+                    &camera.transmission,
+                    &ch.quantum_efficiency,
+                ];
+                integrate_weighted(&spectra, photons).expect("solar spectrum is bounded")
+            })
+            .collect();
+        let pixel_area = camera.pixel_pitch * camera.pixel_pitch;
+        Self {
+            solar_flux,
+            electrons_per_radiance: std::f64::consts::PI * pixel_area * camera.exposure
+                / (4.0 * camera.f_number * camera.f_number),
+            response: camera
+                .channels
+                .iter()
+                .map(|ch| ch.quantum_efficiency.clone())
+                .collect(),
+            transmission: camera.transmission.clone(),
+        }
+    }
+
+    /// Per channel, the albedo a spectrally flat surface would need to look the same as a
+    /// surface with this spectral `reflectance` under sunlight.
+    pub fn effective_albedo(&self, reflectance: &Spectrum) -> Vec<f64> {
+        let photons = |l: f64| l / (PLANCK * SPEED_OF_LIGHT);
+        self.response
+            .iter()
+            .zip(&self.solar_flux)
+            .map(|(qe, flux)| {
+                let spectra = [solar_spectrum(), &self.transmission, qe, reflectance];
+                integrate_weighted(&spectra, photons).expect("solar spectrum is bounded") / flux
+            })
+            .collect()
+    }
+
+    /// Channel radiance of a Lambertian surface with channel albedo `albedo`, lit by the
+    /// Sun at `sun_distance` meters with the Sun `cos_incidence` from the surface normal.
+    pub fn lambert_radiance(
+        &self,
+        channel: usize,
+        albedo: f64,
+        cos_incidence: f64,
+        sun_distance: f64,
+    ) -> f64 {
+        let au = sun_distance / AU;
+        albedo * cos_incidence.max(0.0) * self.solar_flux[channel]
+            / (std::f64::consts::PI * au * au)
+    }
+
+    /// Channel radiance of the solar disk, treated as uniformly bright. It does not depend
+    /// on distance.
+    pub fn sun_radiance(&self, channel: usize) -> f64 {
+        self.solar_flux[channel] / sun_solid_angle_at_1au()
+    }
+
+    /// Electrons collected from channel radiance `radiance` by a pixel whose line of sight
+    /// is `cos_off_axis` from the boresight, including the cos^4 falloff.
+    pub fn electrons(&self, radiance: f64, cos_off_axis: f64) -> f64 {
+        radiance * self.electrons_per_radiance * cos_off_axis.powi(4)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use approx::assert_relative_eq;
+
+    #[test]
+    fn solar_table_integral() {
+        let total = integrate(&[solar_spectrum()]).unwrap();
+        assert_relative_eq!(total, 1325.78, max_relative = 1e-5);
+    }
+
+    #[test]
+    fn integrate_gaussian_matches_closed_form() {
+        let (peak, fwhm) = (0.6, 80e-9);
+        let g = Spectrum::gaussian(peak, 540e-9, fwhm);
+        let exact = peak * fwhm * (std::f64::consts::PI / (4.0 * std::f64::consts::LN_2)).sqrt();
+        assert_relative_eq!(
+            integrate(&[&g, &Spectrum::constant(1.0)]).unwrap(),
+            exact,
+            max_relative = 1e-5
+        );
+        assert_eq!(integrate(&[&Spectrum::constant(1.0)]), None);
+    }
+
+    #[test]
+    fn example_camera_matches_independent_integration() {
+        // Integrated separately (Python, 0.01 nm trapezoid over the same table).
+        let r = Radiometry::new(&CameraConfig::example());
+        for (got, want) in r
+            .solar_flux
+            .iter()
+            .zip([2.413601e20, 2.356644e20, 2.036617e20])
+        {
+            assert_relative_eq!(*got, want, max_relative = 1e-4);
+        }
+    }
+
+    #[test]
+    fn white_surface_facing_sun_electrons() {
+        // The worked example in docs/optics.md.
+        let r = Radiometry::new(&CameraConfig::example());
+        let green = r.electrons(r.lambert_radiance(1, 1.0, 1.0, AU), 1.0);
+        assert_relative_eq!(green, 11_139.0, max_relative = 1e-4);
+    }
+
+    #[test]
+    fn flat_reflectance_has_that_albedo() {
+        let r = Radiometry::new(&CameraConfig::example());
+        for a in r.effective_albedo(&Spectrum::constant(0.3)) {
+            assert_relative_eq!(a, 0.3, max_relative = 1e-12);
+        }
+    }
+
+    #[test]
+    fn sun_radiance_over_disk_is_solar_flux() {
+        let r = Radiometry::new(&CameraConfig::example());
+        assert_relative_eq!(
+            r.sun_radiance(0) * sun_solid_angle_at_1au(),
+            r.solar_flux[0],
+            max_relative = 1e-12
+        );
+        // About 6.8e-5 sr: the Sun is 0.53 degrees across.
+        assert_relative_eq!(sun_solid_angle_at_1au(), 6.8e-5, max_relative = 0.01);
+    }
+
+    #[test]
+    fn lambert_falls_with_square_of_sun_distance() {
+        let r = Radiometry::new(&CameraConfig::example());
+        let near = r.lambert_radiance(0, 0.5, 0.8, AU);
+        assert_relative_eq!(
+            r.lambert_radiance(0, 0.5, 0.8, 2.0 * AU),
+            near / 4.0,
+            max_relative = 1e-12
+        );
+        assert_eq!(r.lambert_radiance(0, 0.5, -0.2, AU), 0.0);
+    }
+}

crates/resolved/src/solar_data.rs

@@ -0,0 +1,862 @@
+//! The TSIS-1 Hybrid Solar Reference Spectrum: solar spectral irradiance at 1 AU.
+//!
+//! @generated by scripts/fetch-solar-spectrum.sh on 2026-10-14 from
+//! <https://lasp.colorado.edu/lisird/latis/dap/tsis1_hsrs_1nm.csv>. Do not edit by hand.
+//!
+//! Coddington, O. M., et al. (2021). The TSIS-1 Hybrid Solar Reference Spectrum.
+//! Geophysical Research Letters, 48, e2020GL091709.
+//! <https://doi.org/10.1029/2020GL091709>
+
+/// Vacuum wavelength, in meters, every 1 nm from 202 to 2730 nm.
+#[rustfmt::skip]
+pub(crate) static WAVELENGTH: [f64; 2529] = [
+    202e-9, 203e-9, 204e-9, 205e-9, 206e-9, 207e-9,
+    208e-9, 209e-9, 210e-9, 211e-9, 212e-9, 213e-9,
+    214e-9, 215e-9, 216e-9, 217e-9, 218e-9, 219e-9,
+    220e-9, 221e-9, 222e-9, 223e-9, 224e-9, 225e-9,
+    226e-9, 227e-9, 228e-9, 229e-9, 230e-9, 231e-9,
+    232e-9, 233e-9, 234e-9, 235e-9, 236e-9, 237e-9,
+    238e-9, 239e-9, 240e-9, 241e-9, 242e-9, 243e-9,
+    244e-9, 245e-9, 246e-9, 247e-9, 248e-9, 249e-9,
+    250e-9, 251e-9, 252e-9, 253e-9, 254e-9, 255e-9,
+    256e-9, 257e-9, 258e-9, 259e-9, 260e-9, 261e-9,
+    262e-9, 263e-9, 264e-9, 265e-9, 266e-9, 267e-9,
+    268e-9, 269e-9, 270e-9, 271e-9, 272e-9, 273e-9,
+    274e-9, 275e-9, 276e-9, 277e-9, 278e-9, 279e-9,
+    280e-9, 281e-9, 282e-9, 283e-9, 284e-9, 285e-9,
+    286e-9, 287e-9, 288e-9, 289e-9, 290e-9, 291e-9,
+    292e-9, 293e-9, 294e-9, 295e-9, 296e-9, 297e-9,
+    298e-9, 299e-9, 300e-9, 301e-9, 302e-9, 303e-9,
+    304e-9, 305e-9, 306e-9, 307e-9, 308e-9, 309e-9,
+    310e-9, 311e-9, 312e-9, 313e-9, 314e-9, 315e-9,
+    316e-9, 317e-9, 318e-9, 319e-9, 320e-9, 321e-9,
+    322e-9, 323e-9, 324e-9, 325e-9, 326e-9, 327e-9,
+    328e-9, 329e-9, 330e-9, 331e-9, 332e-9, 333e-9,
+    334e-9, 335e-9, 336e-9, 337e-9, 338e-9, 339e-9,
+    340e-9, 341e-9, 342e-9, 343e-9, 344e-9, 345e-9,
+    346e-9, 347e-9, 348e-9, 349e-9, 350e-9, 351e-9,
+    352e-9, 353e-9, 354e-9, 355e-9, 356e-9, 357e-9,
+    358e-9, 359e-9, 360e-9, 361e-9, 362e-9, 363e-9,
+    364e-9, 365e-9, 366e-9, 367e-9, 368e-9, 369e-9,
+    370e-9, 371e-9, 372e-9, 373e-9, 374e-9, 375e-9,
+    376e-9, 377e-9, 378e-9, 379e-9, 380e-9, 381e-9,
+    382e-9, 383e-9, 384e-9, 385e-9, 386e-9, 387e-9,
+    388e-9, 389e-9, 390e-9, 391e-9, 392e-9, 393e-9,
+    394e-9, 395e-9, 396e-9, 397e-9, 398e-9, 399e-9,
+    400e-9, 401e-9, 402e-9, 403e-9, 404e-9, 405e-9,
+    406e-9, 407e-9, 408e-9, 409e-9, 410e-9, 411e-9,
+    412e-9, 413e-9, 414e-9, 415e-9, 416e-9, 417e-9,
+    418e-9, 419e-9, 420e-9, 421e-9, 422e-9, 423e-9,
+    424e-9, 425e-9, 426e-9, 427e-9, 428e-9, 429e-9,
+    430e-9, 431e-9, 432e-9, 433e-9, 434e-9, 435e-9,
+    436e-9, 437e-9, 438e-9, 439e-9, 440e-9, 441e-9,
+    442e-9, 443e-9, 444e-9, 445e-9, 446e-9, 447e-9,
+    448e-9, 449e-9, 450e-9, 451e-9, 452e-9, 453e-9,
+    454e-9, 455e-9, 456e-9, 457e-9, 458e-9, 459e-9,
+    460e-9, 461e-9, 462e-9, 463e-9, 464e-9, 465e-9,
+    466e-9, 467e-9, 468e-9, 469e-9, 470e-9, 471e-9,
+    472e-9, 473e-9, 474e-9, 475e-9, 476e-9, 477e-9,
+    478e-9, 479e-9, 480e-9, 481e-9, 482e-9, 483e-9,
+    484e-9, 485e-9, 486e-9, 487e-9, 488e-9, 489e-9,
+    490e-9, 491e-9, 492e-9, 493e-9, 494e-9, 495e-9,
+    496e-9, 497e-9, 498e-9, 499e-9, 500e-9, 501e-9,
+    502e-9, 503e-9, 504e-9, 505e-9, 506e-9, 507e-9,
+    508e-9, 509e-9, 510e-9, 511e-9, 512e-9, 513e-9,
+    514e-9, 515e-9, 516e-9, 517e-9, 518e-9, 519e-9,
+    520e-9, 521e-9, 522e-9, 523e-9, 524e-9, 525e-9,
+    526e-9, 527e-9, 528e-9, 529e-9, 530e-9, 531e-9,
+    532e-9, 533e-9, 534e-9, 535e-9, 536e-9, 537e-9,
+    538e-9, 539e-9, 540e-9, 541e-9, 542e-9, 543e-9,
+    544e-9, 545e-9, 546e-9, 547e-9, 548e-9, 549e-9,
+    550e-9, 551e-9, 552e-9, 553e-9, 554e-9, 555e-9,
+    556e-9, 557e-9, 558e-9, 559e-9, 560e-9, 561e-9,
+    562e-9, 563e-9, 564e-9, 565e-9, 566e-9, 567e-9,
+    568e-9, 569e-9, 570e-9, 571e-9, 572e-9, 573e-9,
+    574e-9, 575e-9, 576e-9, 577e-9, 578e-9, 579e-9,
+    580e-9, 581e-9, 582e-9, 583e-9, 584e-9, 585e-9,
+    586e-9, 587e-9, 588e-9, 589e-9, 590e-9, 591e-9,
+    592e-9, 593e-9, 594e-9, 595e-9, 596e-9, 597e-9,
+    598e-9, 599e-9, 600e-9, 601e-9, 602e-9, 603e-9,
+    604e-9, 605e-9, 606e-9, 607e-9, 608e-9, 609e-9,
+    610e-9, 611e-9, 612e-9, 613e-9, 614e-9, 615e-9,
+    616e-9, 617e-9, 618e-9, 619e-9, 620e-9, 621e-9,
+    622e-9, 623e-9, 624e-9, 625e-9, 626e-9, 627e-9,
+    628e-9, 629e-9, 630e-9, 631e-9, 632e-9, 633e-9,
+    634e-9, 635e-9, 636e-9, 637e-9, 638e-9, 639e-9,
+    640e-9, 641e-9, 642e-9, 643e-9, 644e-9, 645e-9,
+    646e-9, 647e-9, 648e-9, 649e-9, 650e-9, 651e-9,
+    652e-9, 653e-9, 654e-9, 655e-9, 656e-9, 657e-9,
+    658e-9, 659e-9, 660e-9, 661e-9, 662e-9, 663e-9,
+    664e-9, 665e-9, 666e-9, 667e-9, 668e-9, 669e-9,
+    670e-9, 671e-9, 672e-9, 673e-9, 674e-9, 675e-9,
+    676e-9, 677e-9, 678e-9, 679e-9, 680e-9, 681e-9,
+    682e-9, 683e-9, 684e-9, 685e-9, 686e-9, 687e-9,
+    688e-9, 689e-9, 690e-9, 691e-9, 692e-9, 693e-9,
+    694e-9, 695e-9, 696e-9, 697e-9, 698e-9, 699e-9,
+    700e-9, 701e-9, 702e-9, 703e-9, 704e-9, 705e-9,
+    706e-9, 707e-9, 708e-9, 709e-9, 710e-9, 711e-9,
+    712e-9, 713e-9, 714e-9, 715e-9, 716e-9, 717e-9,
+    718e-9, 719e-9, 720e-9, 721e-9, 722e-9, 723e-9,
+    724e-9, 725e-9, 726e-9, 727e-9, 728e-9, 729e-9,
+    730e-9, 731e-9, 732e-9, 733e-9, 734e-9, 735e-9,
+    736e-9, 737e-9, 738e-9, 739e-9, 740e-9, 741e-9,
+    742e-9, 743e-9, 744e-9, 745e-9, 746e-9, 747e-9,
+    748e-9, 749e-9, 750e-9, 751e-9, 752e-9, 753e-9,
+    754e-9, 755e-9, 756e-9, 757e-9, 758e-9, 759e-9,
+    760e-9, 761e-9, 762e-9, 763e-9, 764e-9, 765e-9,
+    766e-9, 767e-9, 768e-9, 769e-9, 770e-9, 771e-9,
+    772e-9, 773e-9, 774e-9, 775e-9, 776e-9, 777e-9,
+    778e-9, 779e-9, 780e-9, 781e-9, 782e-9, 783e-9,
+    784e-9, 785e-9, 786e-9, 787e-9, 788e-9, 789e-9,
+    790e-9, 791e-9, 792e-9, 793e-9, 794e-9, 795e-9,
+    796e-9, 797e-9, 798e-9, 799e-9, 800e-9, 801e-9,
+    802e-9, 803e-9, 804e-9, 805e-9, 806e-9, 807e-9,
+    808e-9, 809e-9, 810e-9, 811e-9, 812e-9, 813e-9,
+    814e-9, 815e-9, 816e-9, 817e-9, 818e-9, 819e-9,
+    820e-9, 821e-9, 822e-9, 823e-9, 824e-9, 825e-9,
+    826e-9, 827e-9, 828e-9, 829e-9, 830e-9, 831e-9,
+    832e-9, 833e-9, 834e-9, 835e-9, 836e-9, 837e-9,
+    838e-9, 839e-9, 840e-9, 841e-9, 842e-9, 843e-9,
+    844e-9, 845e-9, 846e-9, 847e-9, 848e-9, 849e-9,
+    850e-9, 851e-9, 852e-9, 853e-9, 854e-9, 855e-9,
+    856e-9, 857e-9, 858e-9, 859e-9, 860e-9, 861e-9,
+    862e-9, 863e-9, 864e-9, 865e-9, 866e-9, 867e-9,
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+    2098e-9, 2099e-9, 2100e-9, 2101e-9, 2102e-9, 2103e-9,
+    2104e-9, 2105e-9, 2106e-9, 2107e-9, 2108e-9, 2109e-9,
+    2110e-9, 2111e-9, 2112e-9, 2113e-9, 2114e-9, 2115e-9,
+    2116e-9, 2117e-9, 2118e-9, 2119e-9, 2120e-9, 2121e-9,
+    2122e-9, 2123e-9, 2124e-9, 2125e-9, 2126e-9, 2127e-9,
+    2128e-9, 2129e-9, 2130e-9, 2131e-9, 2132e-9, 2133e-9,
+    2134e-9, 2135e-9, 2136e-9, 2137e-9, 2138e-9, 2139e-9,
+    2140e-9, 2141e-9, 2142e-9, 2143e-9, 2144e-9, 2145e-9,
+    2146e-9, 2147e-9, 2148e-9, 2149e-9, 2150e-9, 2151e-9,
+    2152e-9, 2153e-9, 2154e-9, 2155e-9, 2156e-9, 2157e-9,
+    2158e-9, 2159e-9, 2160e-9, 2161e-9, 2162e-9, 2163e-9,
+    2164e-9, 2165e-9, 2166e-9, 2167e-9, 2168e-9, 2169e-9,
+    2170e-9, 2171e-9, 2172e-9, 2173e-9, 2174e-9, 2175e-9,
+    2176e-9, 2177e-9, 2178e-9, 2179e-9, 2180e-9, 2181e-9,
+    2182e-9, 2183e-9, 2184e-9, 2185e-9, 2186e-9, 2187e-9,
+    2188e-9, 2189e-9, 2190e-9, 2191e-9, 2192e-9, 2193e-9,
+    2194e-9, 2195e-9, 2196e-9, 2197e-9, 2198e-9, 2199e-9,
+    2200e-9, 2201e-9, 2202e-9, 2203e-9, 2204e-9, 2205e-9,
+    2206e-9, 2207e-9, 2208e-9, 2209e-9, 2210e-9, 2211e-9,
+    2212e-9, 2213e-9, 2214e-9, 2215e-9, 2216e-9, 2217e-9,
+    2218e-9, 2219e-9, 2220e-9, 2221e-9, 2222e-9, 2223e-9,
+    2224e-9, 2225e-9, 2226e-9, 2227e-9, 2228e-9, 2229e-9,
+    2230e-9, 2231e-9, 2232e-9, 2233e-9, 2234e-9, 2235e-9,
+    2236e-9, 2237e-9, 2238e-9, 2239e-9, 2240e-9, 2241e-9,
+    2242e-9, 2243e-9, 2244e-9, 2245e-9, 2246e-9, 2247e-9,
+    2248e-9, 2249e-9, 2250e-9, 2251e-9, 2252e-9, 2253e-9,
+    2254e-9, 2255e-9, 2256e-9, 2257e-9, 2258e-9, 2259e-9,
+    2260e-9, 2261e-9, 2262e-9, 2263e-9, 2264e-9, 2265e-9,
+    2266e-9, 2267e-9, 2268e-9, 2269e-9, 2270e-9, 2271e-9,
+    2272e-9, 2273e-9, 2274e-9, 2275e-9, 2276e-9, 2277e-9,
+    2278e-9, 2279e-9, 2280e-9, 2281e-9, 2282e-9, 2283e-9,
+    2284e-9, 2285e-9, 2286e-9, 2287e-9, 2288e-9, 2289e-9,
+    2290e-9, 2291e-9, 2292e-9, 2293e-9, 2294e-9, 2295e-9,
+    2296e-9, 2297e-9, 2298e-9, 2299e-9, 2300e-9, 2301e-9,
+    2302e-9, 2303e-9, 2304e-9, 2305e-9, 2306e-9, 2307e-9,
+    2308e-9, 2309e-9, 2310e-9, 2311e-9, 2312e-9, 2313e-9,
+    2314e-9, 2315e-9, 2316e-9, 2317e-9, 2318e-9, 2319e-9,
+    2320e-9, 2321e-9, 2322e-9, 2323e-9, 2324e-9, 2325e-9,
+    2326e-9, 2327e-9, 2328e-9, 2329e-9, 2330e-9, 2331e-9,
+    2332e-9, 2333e-9, 2334e-9, 2335e-9, 2336e-9, 2337e-9,
+    2338e-9, 2339e-9, 2340e-9, 2341e-9, 2342e-9, 2343e-9,
+    2344e-9, 2345e-9, 2346e-9, 2347e-9, 2348e-9, 2349e-9,
+    2350e-9, 2351e-9, 2352e-9, 2353e-9, 2354e-9, 2355e-9,
+    2356e-9, 2357e-9, 2358e-9, 2359e-9, 2360e-9, 2361e-9,
+    2362e-9, 2363e-9, 2364e-9, 2365e-9, 2366e-9, 2367e-9,
+    2368e-9, 2369e-9, 2370e-9, 2371e-9, 2372e-9, 2373e-9,
+    2374e-9, 2375e-9, 2376e-9, 2377e-9, 2378e-9, 2379e-9,
+    2380e-9, 2381e-9, 2382e-9, 2383e-9, 2384e-9, 2385e-9,
+    2386e-9, 2387e-9, 2388e-9, 2389e-9, 2390e-9, 2391e-9,
+    2392e-9, 2393e-9, 2394e-9, 2395e-9, 2396e-9, 2397e-9,
+    2398e-9, 2399e-9, 2400e-9, 2401e-9, 2402e-9, 2403e-9,
+    2404e-9, 2405e-9, 2406e-9, 2407e-9, 2408e-9, 2409e-9,
+    2410e-9, 2411e-9, 2412e-9, 2413e-9, 2414e-9, 2415e-9,
+    2416e-9, 2417e-9, 2418e-9, 2419e-9, 2420e-9, 2421e-9,
+    2422e-9, 2423e-9, 2424e-9, 2425e-9, 2426e-9, 2427e-9,
+    2428e-9, 2429e-9, 2430e-9, 2431e-9, 2432e-9, 2433e-9,
+    2434e-9, 2435e-9, 2436e-9, 2437e-9, 2438e-9, 2439e-9,
+    2440e-9, 2441e-9, 2442e-9, 2443e-9, 2444e-9, 2445e-9,
+    2446e-9, 2447e-9, 2448e-9, 2449e-9, 2450e-9, 2451e-9,
+    2452e-9, 2453e-9, 2454e-9, 2455e-9, 2456e-9, 2457e-9,
+    2458e-9, 2459e-9, 2460e-9, 2461e-9, 2462e-9, 2463e-9,
+    2464e-9, 2465e-9, 2466e-9, 2467e-9, 2468e-9, 2469e-9,
+    2470e-9, 2471e-9, 2472e-9, 2473e-9, 2474e-9, 2475e-9,
+    2476e-9, 2477e-9, 2478e-9, 2479e-9, 2480e-9, 2481e-9,
+    2482e-9, 2483e-9, 2484e-9, 2485e-9, 2486e-9, 2487e-9,
+    2488e-9, 2489e-9, 2490e-9, 2491e-9, 2492e-9, 2493e-9,
+    2494e-9, 2495e-9, 2496e-9, 2497e-9, 2498e-9, 2499e-9,
+    2500e-9, 2501e-9, 2502e-9, 2503e-9, 2504e-9, 2505e-9,
+    2506e-9, 2507e-9, 2508e-9, 2509e-9, 2510e-9, 2511e-9,
+    2512e-9, 2513e-9, 2514e-9, 2515e-9, 2516e-9, 2517e-9,
+    2518e-9, 2519e-9, 2520e-9, 2521e-9, 2522e-9, 2523e-9,
+    2524e-9, 2525e-9, 2526e-9, 2527e-9, 2528e-9, 2529e-9,
+    2530e-9, 2531e-9, 2532e-9, 2533e-9, 2534e-9, 2535e-9,
+    2536e-9, 2537e-9, 2538e-9, 2539e-9, 2540e-9, 2541e-9,
+    2542e-9, 2543e-9, 2544e-9, 2545e-9, 2546e-9, 2547e-9,
+    2548e-9, 2549e-9, 2550e-9, 2551e-9, 2552e-9, 2553e-9,
+    2554e-9, 2555e-9, 2556e-9, 2557e-9, 2558e-9, 2559e-9,
+    2560e-9, 2561e-9, 2562e-9, 2563e-9, 2564e-9, 2565e-9,
+    2566e-9, 2567e-9, 2568e-9, 2569e-9, 2570e-9, 2571e-9,
+    2572e-9, 2573e-9, 2574e-9, 2575e-9, 2576e-9, 2577e-9,
+    2578e-9, 2579e-9, 2580e-9, 2581e-9, 2582e-9, 2583e-9,
+    2584e-9, 2585e-9, 2586e-9, 2587e-9, 2588e-9, 2589e-9,
+    2590e-9, 2591e-9, 2592e-9, 2593e-9, 2594e-9, 2595e-9,
+    2596e-9, 2597e-9, 2598e-9, 2599e-9, 2600e-9, 2601e-9,
+    2602e-9, 2603e-9, 2604e-9, 2605e-9, 2606e-9, 2607e-9,
+    2608e-9, 2609e-9, 2610e-9, 2611e-9, 2612e-9, 2613e-9,
+    2614e-9, 2615e-9, 2616e-9, 2617e-9, 2618e-9, 2619e-9,
+    2620e-9, 2621e-9, 2622e-9, 2623e-9, 2624e-9, 2625e-9,
+    2626e-9, 2627e-9, 2628e-9, 2629e-9, 2630e-9, 2631e-9,
+    2632e-9, 2633e-9, 2634e-9, 2635e-9, 2636e-9, 2637e-9,
+    2638e-9, 2639e-9, 2640e-9, 2641e-9, 2642e-9, 2643e-9,
+    2644e-9, 2645e-9, 2646e-9, 2647e-9, 2648e-9, 2649e-9,
+    2650e-9, 2651e-9, 2652e-9, 2653e-9, 2654e-9, 2655e-9,
+    2656e-9, 2657e-9, 2658e-9, 2659e-9, 2660e-9, 2661e-9,
+    2662e-9, 2663e-9, 2664e-9, 2665e-9, 2666e-9, 2667e-9,
+    2668e-9, 2669e-9, 2670e-9, 2671e-9, 2672e-9, 2673e-9,
+    2674e-9, 2675e-9, 2676e-9, 2677e-9, 2678e-9, 2679e-9,
+    2680e-9, 2681e-9, 2682e-9, 2683e-9, 2684e-9, 2685e-9,
+    2686e-9, 2687e-9, 2688e-9, 2689e-9, 2690e-9, 2691e-9,
+    2692e-9, 2693e-9, 2694e-9, 2695e-9, 2696e-9, 2697e-9,
+    2698e-9, 2699e-9, 2700e-9, 2701e-9, 2702e-9, 2703e-9,
+    2704e-9, 2705e-9, 2706e-9, 2707e-9, 2708e-9, 2709e-9,
+    2710e-9, 2711e-9, 2712e-9, 2713e-9, 2714e-9, 2715e-9,
+    2716e-9, 2717e-9, 2718e-9, 2719e-9, 2720e-9, 2721e-9,
+    2722e-9, 2723e-9, 2724e-9, 2725e-9, 2726e-9, 2727e-9,
+    2728e-9, 2729e-9, 2730e-9,
+];
+
+/// Solar spectral irradiance at 1 AU over a 1 nm band, in W/m^2 per meter of wavelength.
+#[rustfmt::skip]
+pub(crate) static IRRADIANCE: [f64; 2529] = [
+    7.93421e+06, 8.25275e+06, 9.34870e+06, 1.01604e+07, 1.02340e+07, 1.12075e+07,
+    1.29505e+07, 1.70961e+07, 2.34726e+07, 2.85841e+07, 3.38019e+07, 2.98988e+07,
+    3.63487e+07, 3.80811e+07, 3.29880e+07, 3.10206e+07, 4.07636e+07, 4.29708e+07,
+    4.78458e+07, 3.93478e+07, 4.26638e+07, 5.40437e+07, 6.02168e+07, 5.48045e+07,
+    4.48752e+07, 3.39076e+07, 4.67579e+07, 4.84640e+07, 4.52458e+07, 5.06138e+07,
+    4.98640e+07, 4.71771e+07, 3.93797e+07, 4.31525e+07, 4.83372e+07, 4.74957e+07,
+    4.24244e+07, 4.31743e+07, 3.96990e+07, 3.84252e+07, 5.99181e+07, 6.58758e+07,
+    6.19358e+07, 5.25918e+07, 4.72799e+07, 5.15814e+07, 4.92592e+07, 4.20750e+07,
+    5.94584e+07, 5.33512e+07, 3.97410e+07, 4.31610e+07, 5.30123e+07, 6.44646e+07,
+    8.43130e+07, 1.15722e+08, 1.27701e+08, 1.16126e+08, 8.55706e+07, 7.95589e+07,
+    9.96652e+07, 1.03695e+08, 2.28674e+08, 2.31127e+08, 2.56358e+08, 2.43207e+08,
+    2.46272e+08, 2.37151e+08, 2.56405e+08, 2.57078e+08, 1.88436e+08, 2.19706e+08,
+    1.49274e+08, 1.41550e+08, 2.17652e+08, 2.51731e+08, 1.92394e+08, 1.20601e+08,
+    7.51158e+07, 1.44193e+08, 2.60084e+08, 3.14334e+08, 2.95889e+08, 1.57866e+08,
+    2.47291e+08, 3.50950e+08, 2.93162e+08, 3.93753e+08, 5.63198e+08, 5.98267e+08,
+    5.53323e+08, 5.30420e+08, 5.12506e+08, 5.15982e+08, 5.64975e+08, 4.55734e+08,
+    5.19905e+08, 4.80941e+08, 4.34808e+08, 4.52318e+08, 4.26106e+08, 6.08616e+08,
+    6.02198e+08, 6.38780e+08, 5.54159e+08, 6.10367e+08, 6.41679e+08, 5.74133e+08,
+    5.12798e+08, 7.70407e+08, 6.78540e+08, 6.88222e+08, 7.22683e+08, 6.79628e+08,
+    5.76365e+08, 7.63082e+08, 6.95022e+08, 6.95685e+08, 7.82351e+08, 7.46949e+08,
+    7.31419e+08, 6.42728e+08, 7.31384e+08, 7.99047e+08, 9.86086e+08, 9.84251e+08,
+    9.40803e+08, 9.76951e+08, 1.10054e+09, 9.72937e+08, 9.75450e+08, 9.51329e+08,
+    9.30133e+08, 9.87311e+08, 8.62226e+08, 8.12738e+08, 9.10544e+08, 9.55541e+08,
+    1.05054e+09, 9.59361e+08, 9.85431e+08, 1.02918e+09, 8.30821e+08, 9.11420e+08,
+    9.19915e+08, 9.69370e+08, 9.05678e+08, 8.98331e+08, 1.00047e+09, 1.03522e+09,
+    9.82484e+08, 9.59963e+08, 1.12054e+09, 1.13146e+09, 1.04277e+09, 8.40502e+08,
+    7.80920e+08, 8.36656e+08, 1.12709e+09, 9.14983e+08, 9.34391e+08, 1.06542e+09,
+    1.07328e+09, 1.04606e+09, 1.29043e+09, 1.23621e+09, 1.15486e+09, 1.17561e+09,
+    1.28276e+09, 1.14724e+09, 1.10902e+09, 1.05715e+09, 9.29400e+08, 9.25914e+08,
+    1.11405e+09, 1.16017e+09, 1.40984e+09, 1.20927e+09, 1.10599e+09, 1.26761e+09,
+    9.49150e+08, 7.28965e+08, 7.86718e+08, 1.08917e+09, 9.70494e+08, 1.02820e+09,
+    1.00816e+09, 1.04797e+09, 1.25177e+09, 1.32526e+09, 1.25536e+09, 7.22749e+08,
+    7.54598e+08, 1.25905e+09, 1.17748e+09, 6.64623e+08, 1.33843e+09, 1.61448e+09,
+    1.67061e+09, 1.70267e+09, 1.78300e+09, 1.72018e+09, 1.75055e+09, 1.68229e+09,
+    1.64383e+09, 1.64587e+09, 1.69426e+09, 1.85455e+09, 1.58609e+09, 1.74641e+09,
+    1.86879e+09, 1.78052e+09, 1.82671e+09, 1.78174e+09, 1.81352e+09, 1.79489e+09,
+    1.72561e+09, 1.75294e+09, 1.69471e+09, 1.85861e+09, 1.80713e+09, 1.65674e+09,
+    1.74204e+09, 1.72033e+09, 1.70430e+09, 1.65821e+09, 1.67713e+09, 1.58551e+09,
+    1.33185e+09, 1.24661e+09, 1.79758e+09, 1.74594e+09, 1.59198e+09, 1.76730e+09,
+    1.87014e+09, 1.88180e+09, 1.73181e+09, 1.69042e+09, 1.82134e+09, 1.84546e+09,
+    1.96385e+09, 1.97173e+09, 1.97090e+09, 1.99970e+09, 1.83925e+09, 1.98296e+09,
+    2.04276e+09, 2.03290e+09, 2.08708e+09, 2.17995e+09, 2.09993e+09, 1.92355e+09,
+    2.04609e+09, 2.01224e+09, 2.09585e+09, 2.11306e+09, 2.07645e+09, 2.04915e+09,
+    2.03548e+09, 2.10905e+09, 2.11405e+09, 2.12414e+09, 2.06634e+09, 2.01957e+09,
+    2.08380e+09, 1.97493e+09, 2.04607e+09, 2.06904e+09, 2.01020e+09, 1.98527e+09,
+    2.11268e+09, 2.04179e+09, 2.06647e+09, 2.11172e+09, 2.05825e+09, 2.05877e+09,
+    2.14211e+09, 2.07532e+09, 2.11442e+09, 2.08948e+09, 2.12769e+09, 2.07479e+09,
+    2.03868e+09, 2.01056e+09, 1.66956e+09, 1.79348e+09, 1.96471e+09, 1.91988e+09,
+    2.08156e+09, 2.02390e+09, 1.90060e+09, 2.01436e+09, 1.98128e+09, 2.07489e+09,
+    1.99412e+09, 2.03681e+09, 1.97511e+09, 1.96450e+09, 1.96575e+09, 1.88784e+09,
+    1.87552e+09, 1.97003e+09, 1.90435e+09, 1.96939e+09, 2.05146e+09, 1.98341e+09,
+    1.91909e+09, 2.00528e+09, 1.95170e+09, 1.96057e+09, 2.00442e+09, 1.90639e+09,
+    1.87231e+09, 1.89185e+09, 1.91092e+09, 1.59980e+09, 1.76209e+09, 1.76626e+09,
+    1.88909e+09, 1.87250e+09, 1.92294e+09, 1.83430e+09, 1.95506e+09, 1.94948e+09,
+    1.91084e+09, 1.70359e+09, 1.88361e+09, 1.98744e+09, 1.92327e+09, 2.00705e+09,
+    1.95097e+09, 1.82811e+09, 1.91531e+09, 1.93325e+09, 1.99259e+09, 1.86057e+09,
+    1.93832e+09, 1.91747e+09, 1.84857e+09, 1.82749e+09, 1.90798e+09, 1.87883e+09,
+    1.92359e+09, 1.90711e+09, 1.91203e+09, 1.91077e+09, 1.85557e+09, 1.91196e+09,
+    1.90631e+09, 1.88483e+09, 1.91639e+09, 1.86741e+09, 1.90633e+09, 1.92586e+09,
+    1.89775e+09, 1.84647e+09, 1.86840e+09, 1.78607e+09, 1.81513e+09, 1.89408e+09,
+    1.83032e+09, 1.87330e+09, 1.85257e+09, 1.86779e+09, 1.80192e+09, 1.86389e+09,
+    1.86866e+09, 1.83345e+09, 1.85258e+09, 1.77593e+09, 1.86696e+09, 1.89359e+09,
+    1.89173e+09, 1.85812e+09, 1.84098e+09, 1.87181e+09, 1.83217e+09, 1.81675e+09,
+    1.84933e+09, 1.84163e+09, 1.85449e+09, 1.86602e+09, 1.85938e+09, 1.83880e+09,
+    1.78432e+09, 1.83612e+09, 1.83704e+09, 1.67667e+09, 1.71023e+09, 1.81536e+09,
+    1.81561e+09, 1.80451e+09, 1.81513e+09, 1.79440e+09, 1.80274e+09, 1.81573e+09,
+    1.78420e+09, 1.77594e+09, 1.77939e+09, 1.75188e+09, 1.73197e+09, 1.76423e+09,
+    1.78711e+09, 1.78164e+09, 1.76495e+09, 1.76754e+09, 1.74806e+09, 1.73384e+09,
+    1.72121e+09, 1.72373e+09, 1.71735e+09, 1.70955e+09, 1.66737e+09, 1.70649e+09,
+    1.65270e+09, 1.63931e+09, 1.69824e+09, 1.68936e+09, 1.70718e+09, 1.71462e+09,
+    1.67684e+09, 1.66936e+09, 1.66297e+09, 1.63940e+09, 1.63811e+09, 1.68192e+09,
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+    5.16863e+07, 5.15405e+07, 5.17534e+07, 5.15434e+07, 5.15545e+07, 5.10149e+07,
+    5.14546e+07, 5.11551e+07, 5.13144e+07, 5.11899e+07, 5.10315e+07, 5.10385e+07,
+    5.08895e+07, 5.08984e+07, 5.09639e+07, 5.06380e+07, 5.05568e+07, 5.06576e+07,
+    5.06633e+07, 5.02240e+07, 5.01671e+07, 5.03419e+07, 4.99077e+07, 4.96888e+07,
+    4.96758e+07, 4.95427e+07, 4.96654e+07, 4.95673e+07, 4.96656e+07, 4.96110e+07,
+    4.89886e+07, 4.93875e+07, 4.93829e+07, 4.93738e+07, 4.92663e+07, 4.92069e+07,
+    4.90053e+07, 4.90453e+07, 4.88226e+07, 4.87901e+07, 4.88016e+07, 4.86474e+07,
+    4.87192e+07, 4.87129e+07, 4.86353e+07, 4.83596e+07, 4.84662e+07, 4.84709e+07,
+    4.82885e+07, 4.80491e+07, 4.80389e+07, 4.76267e+07, 4.78130e+07, 4.59928e+07,
+    4.24207e+07, 4.69068e+07, 4.74044e+07, 4.73751e+07, 4.74099e+07, 4.69291e+07,
+    4.67839e+07, 4.69163e+07, 4.71313e+07, 4.67341e+07, 4.59732e+07, 4.60281e+07,
+    4.67752e+07, 4.65786e+07, 4.62386e+07, 4.62917e+07, 4.63663e+07, 4.66104e+07,
+    4.61903e+07, 4.57164e+07, 4.48028e+07, 4.53914e+07, 4.59880e+07, 4.56323e+07,
+    4.60161e+07, 4.56695e+07, 4.58417e+07, 4.59081e+07, 4.55244e+07, 4.55436e+07,
+    4.56620e+07, 4.57173e+07, 4.55804e+07, 4.54504e+07, 4.55268e+07, 4.54358e+07,
+    4.52377e+07, 4.54271e+07, 4.52972e+07, 4.50246e+07, 4.46756e+07, 4.49052e+07,
+    4.44047e+07, 4.42347e+07, 4.26025e+07, 4.36715e+07, 4.45189e+07, 4.45860e+07,
+    4.44520e+07, 4.44472e+07, 4.41724e+07, 4.29250e+07, 4.37133e+07, 4.30766e+07,
+    4.32566e+07, 4.31444e+07, 4.37191e+07, 4.38583e+07, 4.34802e+07, 4.34215e+07,
+    4.32302e+07, 4.35448e+07, 4.34793e+07, 4.32875e+07, 4.35792e+07, 4.34663e+07,
+    4.34829e+07, 4.33483e+07, 4.33138e+07, 4.33321e+07, 4.30708e+07, 4.30995e+07,
+    4.30803e+07, 4.30280e+07, 4.28371e+07, 4.27414e+07, 4.23488e+07, 4.21723e+07,
+    4.22924e+07, 4.20916e+07, 4.15653e+07, 4.06720e+07, 4.07752e+07, 3.88035e+07,
+    3.65303e+07, 3.95495e+07, 4.08835e+07, 4.12953e+07, 4.14670e+07, 4.12646e+07,
+    4.15715e+07, 4.17711e+07, 4.16994e+07, 4.16053e+07, 4.17070e+07, 4.16873e+07,
+    4.14453e+07, 4.11604e+07, 3.82918e+07, 4.10898e+07, 4.10400e+07, 4.11268e+07,
+    4.12994e+07, 4.12758e+07, 4.11826e+07, 4.10107e+07, 4.06680e+07, 4.09453e+07,
+    4.10020e+07, 4.07411e+07, 4.07181e+07, 4.08487e+07, 4.04066e+07, 3.95439e+07,
+    4.05029e+07, 4.05919e+07, 4.05107e+07, 4.03701e+07, 4.03226e+07, 4.02825e+07,
+    3.99463e+07, 3.98278e+07, 3.98971e+07, 3.87835e+07, 3.96291e+07, 3.94090e+07,
+    3.99578e+07, 3.99081e+07, 3.98408e+07, 3.97724e+07, 3.97808e+07, 3.97256e+07,
+    3.96716e+07, 3.94843e+07, 3.94956e+07, 3.95203e+07, 3.94784e+07, 3.94205e+07,
+    3.92157e+07, 3.92013e+07, 3.92076e+07, 3.91053e+07, 3.91013e+07, 3.90588e+07,
+    3.90259e+07, 3.89927e+07, 3.87090e+07, 3.88260e+07, 3.88047e+07, 3.86953e+07,
+    3.86127e+07, 3.85968e+07, 3.84972e+07, 3.83765e+07, 3.81709e+07, 3.83800e+07,
+    3.84592e+07, 3.83837e+07, 3.82219e+07, 3.81221e+07, 3.81618e+07, 3.81683e+07,
+    3.80293e+07, 3.81225e+07, 3.79586e+07, 3.74656e+07, 3.76594e+07, 3.79063e+07,
+    3.78605e+07, 3.73825e+07, 3.72048e+07, 3.77497e+07, 3.77149e+07, 3.76596e+07,
+    3.76071e+07, 3.75283e+07, 3.75152e+07, 3.74350e+07, 3.74055e+07, 3.73059e+07,
+    3.72409e+07, 3.73299e+07, 3.72878e+07, 3.71483e+07, 3.71388e+07, 3.64899e+07,
+    3.70918e+07, 3.70473e+07, 3.70334e+07,
+];

crates/resolved/src/spectrum.rs

@@ -2,6 +2,8 @@
 //!
 //! Wavelengths are in meters, like every other length in this crate.
 
+use std::borrow::Cow;
+
 /// A function of wavelength, linearly interpolated between samples and zero outside them.
 #[derive(Clone, Debug, PartialEq)]
 pub struct Spectrum(Repr);
@@ -10,8 +12,8 @@ pub struct Spectrum(Repr);
 enum Repr {
     Constant(f64),
     Sampled {
-        wavelength: Vec<f64>,
-        value: Vec<f64>,
+        wavelength: Cow<'static, [f64]>,
+        value: Cow<'static, [f64]>,
     },
 }
 
@@ -29,7 +31,22 @@ impl Spectrum {
         let increasing = wavelength.windows(2).all(|w| w[0] < w[1]);
         let finite = wavelength.iter().chain(&value).all(|x| x.is_finite());
         (wavelength.len() == value.len() && wavelength.len() >= 2 && increasing && finite)
-            .then_some(Self(Repr::Sampled { wavelength, value }))
+            .then_some(Self(Repr::Sampled {
+                wavelength: wavelength.into(),
+                value: value.into(),
+            }))
+    }
+
+    /// Samples compiled into the binary, borrowed rather than copied. The caller
+    /// guarantees what [`Spectrum::sampled`] checks.
+    pub(crate) fn from_static(wavelength: &'static [f64], value: &'static [f64]) -> Self {
+        debug_assert!(
+            wavelength.len() == value.len() && wavelength.windows(2).all(|w| w[0] < w[1])
+        );
+        Self(Repr::Sampled {
+            wavelength: Cow::Borrowed(wavelength),
+            value: Cow::Borrowed(value),
+        })
     }
 
     /// A Gaussian band with the given peak, center and full width at half maximum, sampled
@@ -41,11 +58,14 @@ impl Spectrum {
         let wavelength: Vec<f64> = (0..SAMPLES)
             .map(|i| lo + (hi - lo) * i as f64 / (SAMPLES - 1) as f64)
             .collect();
-        let value = wavelength
+        let value: Vec<f64> = wavelength
             .iter()
             .map(|l| peak * (-0.5 * ((l - center) / sigma).powi(2)).exp())
             .collect();
-        Self(Repr::Sampled { wavelength, value })
+        Self(Repr::Sampled {
+            wavelength: wavelength.into(),
+            value: value.into(),
+        })
     }
 
     /// The value at `wavelength`, in meters.
@@ -68,6 +88,14 @@ impl Spectrum {
         }
     }
 
+    /// The wavelengths where this spectrum changes slope, empty if it is constant.
+    pub(crate) fn breakpoints(&self) -> &[f64] {
+        match &self.0 {
+            Repr::Constant(_) => &[],
+            Repr::Sampled { wavelength, .. } => wavelength,
+        }
+    }
+
     /// The wavelength range outside which this spectrum is zero, or `None` if it is
     /// constant and so has no bound of its own.
     pub fn support(&self) -> Option<(f64, f64)> {