Migrate from EUD

This guide will help migrate existing Panic’s EUD maps to NS3 and EUD layer in OpenNox.

First, it’s important to understand that “memhacks” and direct memory access is technically not possible in OpenNox.

Here are a few reasons why:

  • Memhacks target a specific binary. This means it only works on one Nox version. OpenNox constantly evolves, thus we cannot guarantee any specific memory layout.
  • Memhacks usually inject assembly code that targets a specific CPU architecture (Intel/AMD x86). OpenNox can be potentially compiled for ARM (e.g. MacBooks, Android, RPi), thus script will stop working there.

We attempted to resolve these issues with EUD developer Panic, but we don’t see any willingness for collaboration from his side. If you really want EUD to be supported directly in OpenNox, please reach out to Panic. Resolving these technical challenges is possible, but requires tight collaboration, and will to do so from him, first and foremost.


First logical question: why bother with converting to OpenNox? EUD works great in original Nox.

A few reasons to migrate to OpenNox scripts:

  • OpenNox is evolving and supports new features that are impossible in vanilla (e.g. HD, better multiplayer, modding, etc).
  • EUD library in OpenNox is a drop-in replacement. Same functions will be supported.
  • NS4 (and beyond) will have even more features going forward.
  • You won’t need a separate script compiler. Scripts are run directly from source.
  • More comprehensive type system: proper arrays, dictionaries (map), structures, classes.
  • A lot more libraries included: string manipulation, full UTF8 support, math, sorting, etc.
  • Better performance: all libraries are compiled into OpenNox and run natively.
  • Better debugging: if script crashes, there’s a stack trace. Scripts can recover from it as well!
  • Go language used in scripts is used in OpenNox itself. Maybe one day you’ll decide to contribute?

In general, we believe that OpenNox is the future of Nox modding, thus porting your map may give it an entirely new life!


At this point, we are still working on improving the EUD compatibility layer, so quite a few functions might still be unavailable. Please talk to us for more details.

In general the conversion process is very similar to the one for converting NS3 source manually. Same changes must be done to the source to align the syntax. We are working on a more automated process.

You need to be aware that all functions using GetMemory and SetMemory must be rewritten in any case. The first thing to do is to check if functions you are using are already available in Panic’s EUD library. If so, updating your EUD script to using these function will help you convert to our EUD library later as well.

We aim to provide a good migration path for well-known EUD libraries, so if you copied code from another EUD project, there’s a high chance we support it in one of the libraries.

Still, if you cannot find anything similar, talk to us. We will help convert your code and include necessary functionality into next OpenNox release.

After conversion

The NS3 guide applies here as well, so make sure to check it out!