SimNIBS Clean Docker Image

Minimal standalone SimNIBS 4.6 image with GUI support for macOS (Apple Silicon).

Docker on Apple Silicon runs x86_64 Linux containers through Rosetta emulation. SimNIBS's 3D viewer (QOpenGLWidget) needs a full OpenGL context with FBO support, which cannot be provided through XQuartz X11 forwarding because:

1. Mesa's llvmpipe (LLVM JIT) crashes under Rosetta emulation
2. Mesa's softpipe works, but its fbConfigs don't match XQuartz's visuals
3. Indirect GLX lacks FBO support needed by Qt's QOpenGLWidget

The solution: run a local Xvfb inside the container (Mesa client + Mesa server = matching fbConfigs), render with softpipe (pure C, no LLVM), and expose the framebuffer via VNC.

docker build --platform linux/amd64 -f Dockerfile.simnibs_clean -t idossha/simnibs_clean:4.6 .

./run_simnibs.sh /path/to/data

Inside the container:

simnibs_gui

Connect from macOS with any VNC client on port 5900 (password: simnibs):

open -a TigerVNC        # then enter localhost:5900
# or
open vnc://localhost:5900  # macOS Screen Sharing