One option might be to rework your C++ 'funcThatCreatesArrays()' function to instead spit out a tab-delimited string containing the row, column, and value of each array index. You could then use that string to make your own array on the script side, something like: %arrData = funcThatCreatesArrays(...

This is a complex topic. I highly recommend working through all of the World Editor and Scripting documents : http://www.roostertailgames.com/TorqueRef/index.html (this is my personal copy - there are others available that may be more up-to-date). Much of the documentation is outdated but if you're ...

You can already define a 2d array in torquescript. Why are you fixated on thunking back and forth to C++?

http://www.roostertailgames.com/TorqueRef/index.html

Okay, can we get the actual use-case?
You can't find any examples of this because there is no need to do this. TorqueScript has multi-dimensional arrays. Why are you not just using them? What is the perceived bottleneck?

Do you need it to do exactly that? Because it'd be pretty simple to create a SimGroup in your engine function, populate it, and return that. SimGroups can be indexed and iterated over in TS.

Easier still would be to just make a quick "SimGroup manager" class script-side.

What's the exact use-case?

Excellent - now we're getting somewhere! Or, maybe nowhere, because it looks like the code that generates the callback isn't actually passing our object reference to script. Congratulations! Sounds like a bug, buddy! Perhaps wander over to the GitHub repo and log an issue?

In vehicle.cs I used onCollision and onImpact, in these functions have tried using %col.getClassName(), %col.getType(), %col.GetName(), %col.GetTargetName(0), %col.GetInternalName() etc. but nothing works. If you don't name every rock and tree in your level how do you know the getName() methods don...

I'm just gonna chime in here and say that when the engine was written people were happy just to have decals working - most didn't bother doing anything besides let the decals fade (like T3D does). Old code is old, bro.

On the client functions exist for adding/removing decals, but you have to have the decal's id: decalManagerRemoveDecal(%unit.decal); decalManagerAddDecal(%position, %norm, 0, 1, "destDecal", true); http://www.roostertailgames.com/TorqueRef/content/documentation/Scripting/Advanced/RTSPrototype.html#S...

Hmm, that's a good question - I thought these decals were handled client-side, but in source it references gDecalManager so perhaps these are server-side and replicated.... <shrug>