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Forza Painter 6

Tool that converts an image into geometric shapes (rectangles + rotated ellipses) and brings them into the Forza Horizon 6 livery editor — either by exporting a JSON file, or by injecting them directly into the game's memory.

Native Windows app written in pure C: a single standalone .exe, Nuklear + GDI GUI, multi-threaded CPU generation, no runtime dependency. The original Python implementation is kept in legacy/ for reference.

Status

Step	Status
Image → shapes generation + GUI (native C)	✅ done
FH6 JSON export	✅ done
FH6 memory injection (step 2)	✅ done
Python generation + Tkinter GUI (step 1)	✅ archived in legacy/

Features

Generation

• Loads any image (PNG / JPG / BMP)
• Automatic alpha channel detection. If the image is transparent, choose between:
  • Keep transparency (sticker mode): no shape placed on empty areas
  • Replace with an opaque color (color picker)
• 6 quality presets adjustable via sliders; shape count capped at 3000 (FH6 limit)
• 6 shape types: rectangles and rotated ellipses (native to FH6, lossless); circles, ellipses, rotated squares, triangles (converted/approximated on export)
• Background generation with live preview and progress

Getting shapes into FH6

• JSON export compatible with FH6 / forza-painter (Export FH6 JSON...)
• Direct memory injection (step 2): writes the shapes into the game process via WriteProcessMemory, no manual input needed. Locates the livery group dynamically (sphere fingerprint + RTTI fallback) and validates before writing (refuses if no reliable candidate is found, to avoid corrupting game state). Offsets confirmed on FH6 build 354.221, overridable without recompiling.

Build & run

Requirements: MSYS2 UCRT64 with GCC. From the MSYS2 UCRT64 shell:

cd native
make release      # produces ./vinyl-painter.exe (GUI, optimized -O3 + LTO)
make run          # launches the exe
make debug        # console build with symbols (prints visible)

Details (windres, icon, DPI manifest) in native/README.md.

Python version (legacy)

The old application (Tkinter GUI + Python generation engine, optional CuPy GPU acceleration) remains functional in legacy/:

pip install -r legacy/requirements.txt
python legacy/main.py

Credits

See NOTICES.md for the full attribution chain.