43 lines
2.7 KiB
Markdown
43 lines
2.7 KiB
Markdown
# Perlines
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Perlines is the 2012 Aethervis trail idea rebuilt as a Fensalir client: audio becomes a rolling field resource that Fensalir's renderer draws as a storm of curl-noise trails, with no private line renderer in the client.
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**Valuable here:** the signal path. `src/Perlines/PerlinesSignalProcessor.cs` turns audio into FFT energy, adaptively whitens it per band, detects the key, and projects bins onto musical scale-note lanes. `src/Perlines/PerlinesRuntime.cs` writes one Float32 column per frame into a rolling field resource and hands it to Fensalir (`Perlin4D.cs` and `SmoothNoise.cs` supply the noise). It is a worked example of a Fensalir client that owns a signal and leaves visibility, reservoir reuse, bloom and reconstruction to the renderer.
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**Problem it solves:** the Unity version owned trails through `LineRenderer` and `TrailRenderer` objects, so the renderer could not reason about them. Here the renderer owns the trails and Perlines owns only the signal.
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**Entry points:** client project `src/Perlines/Perlines.csproj` (solution `Perlines.sln`); design and authority map in `docs/system-map.md`; launched through Fensalir's `scripts/dev-reload.ps1`. Requires a sibling checkout of `GameCult/Fensalir` (Windows, D3D12).
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**Status:** live as a demo. Input is a Fensalir-owned Windows system-loopback stem when one is available, otherwise a procedural fallback signal. Last commit 2026-05-31.
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## Run
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From the root of the Fensalir checkout (Perlines checked out beside it):
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```powershell
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.\scripts\dev-reload.ps1 -ClientProject ..\Perlines\src\Perlines\Perlines.csproj
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```
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Headless smoke test, also from Fensalir:
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```powershell
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.\scripts\dev-reload.ps1 -Headless -ClientProject ..\Perlines\src\Perlines\Perlines.csproj
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```
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`scripts/run-dev.ps1` and `scripts/capture-headless.ps1` in this repo wrap the same launch and a headless PNG capture, but both hardcode the Fensalir location as `E:\Projects\Fensalir`, which does not exist on current workstations. Edit that path before running them.
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## Live Model
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- Perlines owns procedural audio/FFT/whitening and field-resource uploads.
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- Fensalir owns the Win32 host, D3D12 renderer, TubeField compute/render
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lowering, shared reservoir, and presentation denoising.
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- The rolling spectrum is a below-native field evidence source, not a private
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line renderer.
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- The spline lanes are assigned to notes in the detected key instead of
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arbitrary spectrum bins.
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- Each rendered spline is one note lane evolving over the rolling time window.
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- A Fensalir spline presentation turns that reservoir into the old radial
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Perlines trail storm with a divergence-free curl-noise flow, while TubeField
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evidence remains available to the shared reservoir path.
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- Low-energy bands taper and fade out instead of leaving permanent bright
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strokes.
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