Streamline GPS momentum plugin
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# EdgeWeightGPS
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# MomentumGPS
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Cyberpunk 2077 RED4ext plugin that improves player GPS routing by penalizing
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short-segment churn in the native GPS solver. The current validated default
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pushes the GPS toward smoother, higher-momentum driving corridors without
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globally forcing every route onto highways.
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short-segment churn in the native GPS solver. The validated default pushes the
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GPS toward smoother, higher-momentum driving corridors without globally forcing
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every route onto highways.
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## Current Status
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Working prototype, validated in-game.
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Working RED4ext plugin, validated in-game.
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- Route scoring patch: enabled.
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- Live tuning file: enabled.
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- Current default fixed-edge penalty: `80.0`.
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- Highway multiplier: neutral `1.0`; the earlier highway-speed/class
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experiments are not part of the playable default.
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- Current fixed ordinary-edge penalty: `80.0`.
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- Live tuning: removed from the release build.
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- Highway multiplier/class weighting experiments: not part of the playable
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default.
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The active package is a RED4ext plugin only:
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```text
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red4ext/plugins/EdgeWeightGPS/EdgeWeightGPS.dll
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red4ext/plugins/EdgeWeightGPS/momentum_weights.bin
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red4ext/plugins/EdgeWeightGPS/solver_weights.bin
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red4ext/plugins/MomentumGPS/MomentumGPS.dll
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red4ext/plugins/MomentumGPS/README.txt
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```
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## What It Patches
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Reverse engineering found the player GPS route search loop around the native
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solver relaxation cluster. The useful patch surface is not the script-facing
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`RunGPSQuery`/`UpdateGPSQuery` helpers and not the generated traffic
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`maxSpeed` fields. The playable hook patches the two ordinary adjacency
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expansion sites feeding the native relax/update routine at `0x40ba58`.
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`RunGPSQuery`/`UpdateGPSQuery` helpers and not generated traffic `maxSpeed`
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fields. The playable hook patches the two ordinary adjacency expansion sites
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feeding the native relax/update routine at `0x40ba58`.
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The plugin adds a nonnegative fixed cost to ordinary edge expansion. In
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practice, this makes many tiny street segments and repeated 90-degree
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stair-steps less attractive, while still allowing local roads when they are the
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right path.
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The plugin adds a fixed cost to ordinary edge expansion. In practice, this makes
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many tiny street segments and repeated 90-degree stair-steps less attractive,
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while still allowing local roads when they are the right path.
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This is an inline native patch against tested Cyberpunk 2077 executable RVAs. A
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future game update may require fresh verification.
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## Validation Summary
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@@ -69,7 +70,7 @@ toolbox run -c 2077 ./tools/build_red4ext_shim.sh
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This writes:
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```text
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build/red4ext/EdgeWeightGPS-mingw64/EdgeWeightGPS.dll
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build/red4ext/MomentumGPS-mingw64/MomentumGPS.dll
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```
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## Install Locally
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@@ -80,13 +81,9 @@ Only install while the game is cold.
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toolbox run -c 2077 ./tools/install_red4ext_shim.sh
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```
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The install script builds the DLL, installs it into the Flatpak Steam Cyberpunk
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2077 folder, and writes the validated defaults:
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- `momentum_weights.bin = 80.0`
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- `solver_weights.bin = 1.0`
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Override the game directory with `CYBERPUNK2077_GAME_DIR` if needed.
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The install script builds the DLL and installs it into the Flatpak Steam
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Cyberpunk 2077 folder. Override the game directory with
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`CYBERPUNK2077_GAME_DIR` if needed.
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## Package
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@@ -99,26 +96,6 @@ toolbox run -c 2077 ./tools/package_red4ext_mod.sh
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The package is written under `dist/` and contains the `red4ext/` folder layout
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expected by the game.
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## Live Tuning
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`momentum_weights.bin` is a single little-endian float32 and is hot-reloaded
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every 500 ms while the game is running.
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Useful presets:
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```bash
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python3 tools/write_momentum_weights.py vanilla # 0.0
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python3 tools/write_momentum_weights.py default # 80.0
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python3 tools/write_momentum_weights.py overstrong # 160.0, known too high
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```
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`solver_weights.bin` is still present for older highway multiplier experiments,
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but the playable default keeps it neutral:
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```bash
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python3 tools/write_solver_weights.py vanilla # 1.0
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```
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## Repository Notes
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This repository also contains older experiments and reverse-engineering tools:
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@@ -127,6 +104,7 @@ This repository also contains older experiments and reverse-engineering tools:
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- Traffic lane and connection probability patchers.
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- Static disassembly helpers.
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- RED4ext logging probes.
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- Earlier live-tuning helpers and presets.
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Those tools are retained because they explain the route-finding system and
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document failed approaches, but they are not part of the current playable
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