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I have no experience in this aspect of it. I can't think of a way off the top of my head to do this.
  - Anthony Michelizzi

Ok I'm going to turn this into a forum post on Unity.  Once I have something I'll post here.

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James Fleming 
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I don't know how to keep track of it myself for to view how unity keeps track of it, but from my understanding, only assets that are used in-game are packaged at the time of building. That means unity is keeping track. The question is how to gain access to that information.

In Xenko I counted all the asset in the scene and put it on the screen so I know how many I was using so this code below might do that for us.  Not sure if it will pick up GUI elements too thought.  I just want the asset that we use in the IsGameable folder so I can see what we are using and what we are not using.

UnityEngine.Object.FindObjectsOfType<GameObject>()

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James Fleming 
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iirc, FindObjectsOfType only gets ones in the active scene. Which means they would have to be active in the scene. I could be wrong though.

  - Anthony Michelizzi

Yea but if we created like and XML for the game sooner or later we would get a list of each asset etc in debug mode only.  This would allow us to cut dead weight off the project when needed.  Asset get forgot about :( like lost kittens.

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James Fleming 
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@James

I have a script that handles it (I think) It's currently running and seems to be doing fine.

I'll sync it up with you when it's done running.

Ok and then I found this too so I'm make creating the functionality for XML agenda too.

https://www.youtube.com/watch?v=nYWlB7HRNSE

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James Fleming 
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So the utility I have works as far as I can tell. The list of unused assets didn't include two assets I know I did use. So there is some validation.

Also while it was running, I noticed it found a reference to a texture I used.

There's it running and where it found the two assets I used and how they are used. It also checks for prefabs created that it cant find as well. So if someone does make a prefab out of an asset, and it ends up unused, you can track that too.

I'm running a scan over all the branches to see if you can get a generalized list.

Well done that will be a slick utility for us to track our isgameable stuff.

Awesome Sauce

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James Fleming 
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It worked for the two branches I have opened in unity. Seems you'll have to actually have opened the projects for it to work, but it does work

It's checked in at the root of the project with the PreBuildClean Utility 

Anthony that is pretty awesome, looks like its working for the intended functionality. I assume this is mainly to keep the MCU from having to transfer huge file structures all the time. But I found this as well and I'm sharing it only because I had mentioned it earlier but wasn't sure until now.  

"Unity strips most unused Assets during the build, so you don’t gain anything by manually removing Assets from the Project. The only Assets that are not removed are scripts (which are generally very small anyway) and Assets in the Resources folder (because Unity can’t determine which of these are needed and which are not). With this in mind, you should make sure that the only Assets in the Resources folder are the ones you need for the game. You might be able to replace Assets in the Resources folder with AssetBundles - this means that Unity loads Assets dynamically, thereby reducing the player size."

That comes from this page in the Unity Manual - Reducing Build Size

Obviously, we still want to keep the project structure clean so that utility is really cool, but as far as actual game builds it won't make much of a difference. The info the utility provides could be super handy for the MCU tool.

I know that was a little off topic to asset tracking, I'm sorry for diverging, I thought it would be relevant.

It doesn't remove anything. It just makes a list of unused assets. This way we can try to use everything and not forget that we might have a particular asset to still use. It's purely an analytical resource.
  - Anthony Michelizzi

That's actually pretty cool, especially as asset count increases.