camera-no-clip

Minimal Minecraft 1.8.9 mod that removes third-person camera collision (no-clip camera) by hooking World.rayTraceBlocks via vmhook. No JNI, no JVMTI, no Forge/Fabric – injected as a plain Windows DLL.

When EntityRenderer.orientCamera calls World.rayTraceBlocks to figure out where to put the third-person camera, the hook returns null (no collision) so the camera passes through walls. Every other caller of rayTraceBlocks (block-break reach, entity hit-test, player interactions) is left alone.

How it works

main.cpp installs exactly one vmhook hook:

vmhook::hook<sdk::world>("rayTraceBlocks", signature, &on_ray_trace_blocks);

The detour inspects the calling frame via vmhook::return_value::caller(). If the caller is EntityRenderer.orientCamera, it writes null into the return slot and lets the JVM continue. Anything else falls through unchanged.

Three name schemes are supported (auto-detected at startup):

• MCP — vanilla 1.8.9, most Hypixel clients, Lunar, Badlion.
• SRG — Searge names used by Forge at runtime (func_* / field_*).
• OBF — 1.8.9 obfuscated jars (e.g. adm, bfk).

MCP and SRG share class names, so detection probes World.playerEntities (MCP) vs World.field_73010_i (SRG) to tell them apart.

vmhook v0.5.0 ships an auto-repair watchdog, so the hook keeps firing even after HotSpot's tiered compiler eventually re-JITs rayTraceBlocks.

Build

Requires Visual Studio 2026 (or any toolchain with v145 / C++23).

msbuild camera-no-clip.slnx -p:Configuration=Release -p:Platform=x64

Outputs:

• build/camera-no-clip.dll – the mod
• build/camera-no-clip-injector.exe – tiny console injector

Usage

1. Launch Minecraft (1.8.9 client) and wait until the main menu is showing.

2. Run build\camera-no-clip-injector.exe. A small ImGui window lists every running javaw.exe / java.exe by window title and PID; click one to inject. The DLL is embedded inside the injector as an RCDATA resource, so the .exe is the only file you need to ship. (If a sibling camera-no-clip.dll is found next to the .exe, that one is preferred over the embedded copy — useful while iterating on the DLL build.)

3. A small console window pops up inside Minecraft's process with the mod's log output.

4. In-game hotkeys:

   • DELETE – toggle camera no-clip on / off
   • END – cleanly unload (uninstall hook, free the DLL)

Layout

camera-no-clip/
├── camera-no-clip/
│   ├── ext/vmhook/vmhook.hpp   single-header vmhook v0.5.0 (vendored)
│   └── src/
│       ├── main.cpp             SDK type tags, mapping, hook detour, hotkey loop
│       └── dllmain.cpp          DLL entry; spawns worker thread, attaches console
└── injector/
    ├── ext/imgui/               imgui + DX11/Win32 backends (vendored)
    ├── ext/idr.rc               embeds camera-no-clip.dll as RCDATA resource 256
    └── src/main/
        ├── main.cpp             Win32 window, message loop
        ├── dx11.cpp/.hpp        D3D11 swap chain init / cleanup
        ├── injector.cpp/.hpp    Enumerate javaw windows, LoadLibrary via CreateRemoteThread
        └── ui.cpp/.hpp          ImGui target-picker UI

License

MIT. vmhook is also MIT (see vmhook.hpp header).