RTS Game - Resource Collection

Introduction

In this tutorial, we'll implement a resource collection mechanic similar to the mineral nodes in Starcraft. By the end of this guide, you will have created a resource node actor, a new unit with resource collection logic, and a UI element to track the resources collected by the player. This mechanic is essential for resource management in real-time strategy (RTS) games, allowing players to gather resources for building units and structures.

Step 1: Create a Resource Node Actor

To start, we need to establish a resource node that players can interact with.

1. Open Your Game Engine: Launch your preferred game engine (e.g., Unity or Unreal Engine).
2. Create a New Actor:
   • In your project, create a new actor class named ResourceNode.
   • This actor will represent the mineral nodes.
3. Define Resource Properties:
   • Add properties for the resource type and amount. You can use variables like resourceType (string) and resourceAmount (integer).
4. Set Up Interaction Logic:
   • Implement logic to allow units to collect resources when they interact with the node. This could involve creating an interaction function that decreases the resourceAmount and returns the collected resources to the unit.

Step 2: Implement Resource Collection Logic in Units

Now that we have our resource node, we need to create a unit that can collect resources.

1. Create a New Unit Class:
   • Create a new class called ResourceCollectorUnit.
2. Add Resource Collection Functionality:
   • Implement a method called CollectResources within this class. This method will handle the interaction with the ResourceNode. Here’s a simple outline of the method:

   def CollectResources(self, resourceNode):
       if resourceNode.resourceAmount > 0:
           collected = min(self.carryCapacity, resourceNode.resourceAmount)
           resourceNode.resourceAmount -= collected
           self.resources += collected
   

3. Assign a Carry Capacity:
   • Define a carryCapacity property to limit how much resource this unit can hold at once.

Step 3: Create the UI Element for Resource Tracking

To keep players informed about their resources, we need to implement a UI element.

1. Design the UI Layout:
   • Create a UI canvas in your game engine.
   • Add a text element to display the current resource amount.
2. Bind UI to Resources:
   • In your ResourceCollectorUnit, create an update function that refreshes the UI text whenever resources are collected.

   def UpdateUI(self):
       uiElement.text = f"Resources: {self.resources}"
   

3. Link the UI Update with Resource Collection:
   • Call the UpdateUI method within the CollectResources method to ensure the UI reflects changes immediately.

Step 4: Test and Debug the Resource Collection Mechanic

Finally, it's crucial to test your implementation to ensure everything works as expected.

1. Run the Game:
   • Start your game and spawn a ResourceNode and a ResourceCollectorUnit.
2. Interact with the Resource Node:
   • Move the unit to the resource node and trigger the collection process.
3. Check Resource Display:
   • Verify that the resource amount decreases in the node and increases in the unit's UI display.
4. Debug Issues:
   • If you encounter issues, check the interaction logic and ensure that the UI is updating correctly.

Conclusion

In this tutorial, we successfully implemented a resource collection mechanic for an RTS game. We covered creating a resource node actor, adding resource collection logic to a unit, and designing a UI element to track collected resources. As a next step, consider adding more complex features such as resource depletion, different types of resources, or a system to spend resources on units and buildings. Happy game developing!