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Blitz3D Decompile and Port

Decompile a Blitz3D game and port its logic or animated models to another engine like Roblox

Source Download skill
Repository
rehan-remade/universal-modder
Stars
9,328
Licence
MIT
Files
7 files

What it does

When installed, the agent follows a documented workflow for taking an old Blitz3D game (a BASIC-like 3D engine), decompiling its compiled exe back into readable Blitz source using the B3DDecomp tool, and then re-creating its behaviour in another engine such as Roblox. It also includes Python and Blender scripts that convert animated .b3d 3D models (with bones and keyframes) into a Roblox-friendly format. It stresses that the original game is the reference to test against and that protected or unlicensed games should not be reverse-engineered.

Great for

  • Modders porting an open-source or self-owned Blitz3D game, such as SCP: Containment Breach, into another engine
  • Developers converting animated Blitz3D viewmodels into Roblox with bones and keyframes intact
  • Engineers who need to verify a port's timing, rates and aim against the original game's decompiled numbers

Skip it if

  • Decompiling commercial or protected games the user has no rights to: the skill itself says to stop, and publishing the result can infringe copyright
  • Protected builds that hash function names or encrypt the module: the skill says to stop rather than defeat the protection
  • Non-developers with no Blender, .NET or command-line experience, since setup is technical

Try asking

  • “Decompile my SCP-CB copy with B3DDecomp and show me the player movement code”
  • “Port the Blitz3D viewmodel animation for this weapon into a Roblox-ready FBX”
  • “Measure the fire rate of the decompiled weapon at the fixed tick and compare it with my port”
  • “Explain how Blitz3D's Animate and CurveValue functions differ from a straight transcription”
Step-by-step guide: how to use Blitz3D Decompile and PortInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 7 original files, the MIT licence and an attribution note.

    blitz3d-decomp.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip blitz3d-decomp.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip blitz3d-decomp.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Keep all decompiled output and disassembly outside any repository and never publish it; only the scripts are meant to be shared.
  • Only port games you own or openly licensed games, and credit them and check each asset's licence before uploading anything.
  • Check the exe's sections with objdump or a PE viewer before starting, and stop if a .b3dmod section is present.

What's inside

  • references/b3d-to-roblox.md
  • references/blitz-runtime.md
  • scripts/roblox/b3d_skin.py
  • scripts/roblox/vm_anim_data.py
  • scripts/roblox/vm_build.py
  • scripts/roblox/vm_render.py
  • SKILL.md

Redistributed unmodified from rehan-remade/universal-modder under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.