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-# donut documentation
-
-deeper documentation for donut, the real-time schwarzschild black-hole renderer.
-the top-level [`README.md`](../README.md) is the overview; the two documents here
-go into how it actually works.
-
-- **[physics.md](physics.md)** — the physics and maths. tracing light through
-  curved spacetime: the schwarzschild metric, null geodesics and the equations of
-  motion, the numerical integrator and its adaptive step, the event horizon /
-  photon sphere / isco, the novikov–thorne accretion disk, gravitational and
-  doppler redshift with relativistic beaming, and the observable quantities the
-  renderer can measure. tied throughout to
-  [`assets/shaders/geodesic.slang`](../assets/shaders/geodesic.slang).
-
-- **[architecture.md](architecture.md)** — how the program is built. the code's
-  layering (application / scene / renderpath / uilayer), the portable rhi that lets
-  the same rendering run on opengl and vulkan, the frame loop, the unified
-  scene-and-simulation world, the rendering pipeline (progressive resolution,
-  supersampling, environment lighting, tone-mapping), the workspace tabs and docking ui, the export
-  pipeline, and the build system.
-
-for each pixel, donut casts a ray from the camera and follows it backward through
-the curved spacetime around sagittarius a\*. rays that fall past the horizon are
-the shadow; rays that graze the photon sphere wind around it into the bright ring;
-rays that strike the hot orbiting disk pick up its shifted glow; rays that escape
-read the background sky. that trace is one gpu shader, fed by a small portable
-graphics layer so it runs identically on both backends.