sagittariusas 0.0.3

Simulation engine for Sagittarius A* — Kerr spacetime, accretion, jets, lensing, and shadow observables
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# Changelog

All notable changes to the `sagittariusas` crate are documented in this file.

Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).

## [0.0.2] - 2026-04-04

### Added
- Rendering module: mesh.rs (icosphere subdivision, LodLevel, Vertex, MeshData), lod.rs (pixel-precise adaptive LOD), materials.rs (PBR parameters), shaders.rs (shader parameters)
- `documentation` and `homepage` fields in Cargo.toml
- Celestial project link in README.md

## [0.0.1] - 2026-04-02

Initial release.

- Kerr spacetime geometry with full metric tensor and geodesic ray tracing (RK4, geometrized units)
- Accretion disk models: Shakura-Sunyaev, ADAF, Slim — temperature profiles, surface density, luminosity
- Relativistic jet engine: Blandford-Znajek power, Doppler boosting, superluminal motion, synchrotron cooling
- Gravitational lensing: Einstein radius, image positions, magnification, Shapiro delay, strong-field deflection
- Black hole shadow: critical impact parameter, contour, asymmetry, EHT angular diameter prediction
- Radiation module: Planck radiance, Wien displacement, bremsstrahlung, Eddington luminosity/ratio
- General relativity: Lorentz transforms, Schwarzschild metric, gravitational redshift, gravitational wave power
- Singularity classification: Schwarzschild, Kerr, Reissner-Nordström, naked singularity detection
- Thermodynamics: Hawking temperature, Bekenstein-Hawking entropy, evaporation time, Penrose process
- Sgr A* physical parameters calibrated to current observations (M = 4×10⁶ M☉, a = 0.9, d = 8178 pc)
- 69 integration tests across engine, observables, and physics modules
- 3 runnable examples: accretion disk simulation, jet viewer, shadow prediction

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## What is solid

- Sgr A*-specific simulation calibrated to current observational data
- Research-grade Kerr spacetime with geodesic ray tracing
- Three accretion disk models with physically-based temperature profiles
- Rendering endpoints ready for external visualisation

## Points to watch

- Accretion disk models at very high/low spin parameters
- Shadow prediction accuracy for next-generation EHT observations

## Verdict

Dedicated Sagittarius A* simulation engine with observationally-calibrated parameters and rendering endpoints.

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## Development notes

- Edition 2024, MIT license
- Dependencies use wildcard versions
- See `ComingSoon.md` for the detailed roadmap