Regional Supply/Demand DLL

[Null 45 3,020]

Adds a basic supply/demand system in the form of a region-wide resource pool.

This mod differs from the BSC Daeley Regional Tracking Mod in that it works independently of the city names. It also lacks the region-wide building tracking features of that mod.

The 'resources' consist of a Uint32 resource id and a Sint64 quantity. The resource ids should be random to prevent conflicts between different mods that use this DLL as a dependency. Naming the resources is left up to the mod authors that use this DLL as a dependency.

Download: https://community.simtropolis.com/files/file/36832-regional-supplydemand-dll/

Building Exemplar Properties

The DLL adds two new building exemplar properties that allow resources to be added or removed by plopping a building. Both values use paired Uint32 items, consisting of a resource id and a quantity.

Property Name	Property ID	Description
Regional Supply Consumed	0x16F4C223	The resources the building consumes from the regional supply.
Regional Supply Produced	0x16F4C224	The resources the building adds to the regional supply.

Lua Functions

The DLL provides a regional_supply table with the following functions for use by Lua code.

Function Name	Description
add_to_demand	Adds to the existing demand for a resource.
remove_from_demand	Subtracts from the existing demand of a resource.
add_to_supply	Adds to the existing supply of a resource.
remove_from_supply	Subtracts from the existing supply of a resource.
get_resource_quantity	Gets the current quantity of a resource.

 

System Requirements

• Windows 10 or later

The plugin may work on Windows 7 or later with the Microsoft Visual C++ 2022 x86 Redistribute installed, but I do not have the ability to test that.

Installation

1. Close SimCity 4.
2. Copy SC4RegionalSupplyDemand.dll and RegionalSupplyDemand.dat into the top-level of the Plugins folder in the SimCity 4 installation directory or Documents/SimCity 4 directory.
3. Start SimCity 4.

Troubleshooting

The plugin should write a SC4RegionalSupplyDemand.log file in the same folder as the plugin.
The log contains status information for the most recent run of the plugin.

Source Code and Support

The plugin's source code and issue tracker are located on GitHub: https://github.com/0xC0000054/sc4-regional-supply-demand

	If you would like to make voluntary contributions to support me in continuing to create more content for SimCity 4, I accept donations via PayPal: https://paypal.me/0xC0000054
	Thanks to the few people who have donated to me.

[Kel9509 1,357]

This looks really cool.  Some questions: the 2 new building exemplars relate to supply.  Would there be any reason for a building to show what kind of resource it demands?  Or is this DLL really just to implement lots that generate resources?  

Also, can multiple resources be created?  If so, then if there are 2 or more resources, will those exemplars be able to show supply (or demand) for each of those resources separately somehow?

What if each industrial lot is edited to produce a specific resource?  What are the practical limits of this mod?  Can there be dozens of resources?  Or it it more limited for use with things like power, water, garbage, etc?

[Ulisse Wolf 4,399]

1 hour ago, Kel9509 said:

This looks really cool.  Some questions: the 2 new building exemplars relate to supply.  Would there be any reason for a building to show what kind of resource it demands?  Or is this DLL really just to implement lots that generate resources?  

Also, can multiple resources be created?  If so, then if there are 2 or more resources, will those exemplars be able to show supply (or demand) for each of those resources separately somehow?

What if each industrial lot is edited to produce a specific resource?  What are the practical limits of this mod?  Can there be dozens of resources?  Or it it more limited for use with things like power, water, garbage, etc?

From what I see the DLL mod implements the resource logic in the game engine but still requires LUA Code and New_Properties.xml for things to work. Which allows us to create more resources that can be managed by buildings.

This mod has huge potential and overcome any limit but the limit is set by how we want to make complex production chains that then have to be written to LUA and New_Properties.xml

 

[Null 45 3,020]

On 4/19/2025 at 10:52 AM, Kel9509 said:

Would there be any reason for a building to show what kind of resource it demands?

Not yet. As I mentioned in the first post, all the DLL does is allow 'resources' to be tracked at a region level. The resources don't have names, they are just a random id and associated quantity. The intended use case was plopped buildings with some reward conditioned based on the available supply of specific resource ids.

On 4/19/2025 at 10:52 AM, Kel9509 said:

Also, can multiple resources be created?

Yes.

On 4/19/2025 at 10:52 AM, Kel9509 said:

What are the practical limits of this mod?

I have no idea. This mod is independent of the Maxis region system, but having hundreds or thousands of resources would eat up a lot of memory.

[sctieba 93]

Is this DLL mod  similar to the industrial DLC for 《Cities: Skylines》？

[Null 45 3,020]

5 hours ago, sctieba said:

Is this DLL mod  similar to the industrial DLC for 《Cities: Skylines》？

 It could potentially be used to implement some kind of industrial reward chain, but there is no direct interaction with the RCI system.

[Kel9509 1,357]

Circling back to this - has New_Properties.xml been updated to implement the new building exemplar properties?

[Null 45 3,020]

4 hours ago, Kel9509 said:

Circling back to this - has New_Properties.xml been updated to implement the new building exemplar properties?

It doesn't look like it, but I may have missed the ids when I searched for them.