Crate prakash 

Prakash — Optics and light simulation for AGNOS

Sanskrit: प्रकाश (prakash) — light, illumination, to make visible

Provides ray optics, wave optics, spectral math, lens geometry, physically-based rendering, and atmospheric optics. Built on hisab for math foundations.

Modules

• ray — Geometric optics: reflection, refraction, Snell’s law, Fresnel, dispersion, sequential/recursive ray tracing, ray fans, spot diagrams, OPD
• wave — Wave optics: interference, diffraction, polarization (Jones/Stokes/Mueller), coherence, Fabry-Pérot, anti-reflection coatings, 2D patterns, PSF
• spectral — Wavelength ↔ RGB, blackbody radiation, CIE 1931, SPD, illuminants, CRI, color temperature
• lens — Lens/mirror geometry: thin/thick lens, aberrations (Seidel), MTF, DoF, Petzval, multi-element systems
• [pbr] — PBR shading: Cook-Torrance, GGX, sheen, clearcoat, SSS, iridescence, volumetric, importance sampling, environment maps
• [atmosphere] — Atmospheric optics: Rayleigh/Mie scattering, sky color, air mass, optical depth, sunset model
• error — Error types

Wavelength parameter convention

• _nm suffix — wavelength in nanometers (spectral, CIE, visible-range functions)
• _m suffix — wavelength in meters (Planck, atmospheric scattering, coherence)
• _um suffix — wavelength in micrometers (dispersion: Sellmeier, Cauchy)
• unsuffixed — unit-agnostic; caller provides consistent units (wave optics, lens)

Within wave-optics functions, wavelength is always the first parameter, followed by geometry (aperture, slit width), then observation angle/position.

Re-exports

pub use error::PrakashError;

Modules

error

Error types for prakash.

lens

Lens and mirror geometry — focal length, magnification, thin lens equation, aberrations.

ray

Geometric (ray) optics — reflection, refraction, Snell’s law, Fresnel equations.

spectral

Spectral math — wavelength ↔ RGB, blackbody radiation, color temperature.

wave

Wave optics — interference, diffraction, polarization.