Reorganising MMPs

[justforfun 7,932]

So I have this question: if I plop some MMPs, save the city, then reorganise those MMPs by changing their instances, will this screw up the savefile, make the MMPs I've plopped disappear, or create other problems? Thank you!

[rsc204 21,869]

Yeah this is gonna be a problem, because without the original Flora Exemplar present, there is no link to the Model actually in place. So it’d be the same as removing a Prop/Buildings Exemplar for an object already in game. Worse that missing Flora Exemplars uniquely can cause a CTD trying to load a city with them present. A commonly noted issue surrounding tree controllers which too use Flora.

[justforfun 7,932]

5 hours ago, rsc204 said:

Yeah this is gonna be a problem, because without the original Flora Exemplar present, there is no link to the Model actually in place. So it’d be the same as removing a Prop/Buildings Exemplar for an object already in game. Worse that missing Flora Exemplars uniquely can cause a CTD trying to load a city with them present. A commonly noted issue surrounding tree controllers which too use Flora.

Thank you, good that I got confirmation of this before making a mess!

[11241036 5,119]

On 1.9.2024 at 10:00 AM, justforfun said:

So I have this question: if I plop some MMPs, save the city, then reorganise those MMPs by changing their instances, will this screw up the savefile, make the MMPs I've plopped disappear, or create other problems? Thank you!

Yes, this will cause trouble. The savegame saves the IID of MMP's, as well as lots and so on. Which means if you change the instance of a MMP, you will either get a brown box, or a CTD, as far as I know when trying to remove such an object because the game cannot find an object in your Plugins folder with a corresponding IID anymore. If you need to change the IID of an object, you need to remove all instances of these MMP's from your cities first.