Learn How to Create a Traffic Light System in Unreal Engine!

Table of Contents

1. Introduction
2. Correcting Previous Tutorial Mistakes
3. Setting up the Traffic Light System
4. Changing Car Colors
5. Creating Paths for the Cars
6. Creating the Traffic Lights
7. Making the Traffic Lights Change Colors
8. Making the Cars Recognize the Traffic Lights
9. testing the Traffic Light System
10. Conclusion

Introduction

In this tutorial, we will learn how to set up a simple traffic light system using the Unreal Engine. We will build upon the knowledge gained from previous tutorials and create a scene with two cars that follow different paths. The traffic lights will change colors, and the cars will recognize the traffic light signals and respond accordingly. Let's dive in!

Correcting Previous Tutorial Mistakes

Before we begin, let's correct two mistakes from the previous tutorial. First, we'll fix the stop function in the AI car blueprint. We'll disconnect the existing logic, set the boolean variable to true, and reconnect the nodes. This change ensures that when the stop function is called, the stand variable is set to true.

Next, we'll create a new function called "driving" in the AI car blueprint. We'll copy the code from the existing function and make a small change. We'll set the stand variable to false, indicating that the car is no longer stopped. Additionally, we'll release the handbrake by connecting a node to the existing logic. Finally, we'll call the driving function in the event graph.

Setting up the Traffic Light System

To create the traffic light system, we'll first need to duplicate the AI car blueprint to have two cars in our scene: one red and one blue. We'll change the color of the mesh for the red car to easily differentiate between them.

Next, we'll create paths for the cars to follow. We'll duplicate the existing path and position it for the Second car. We'll then modify the settings for the second car to follow the second path.

Changing Car Colors

In order to distinguish between the red and blue cars, we'll change the color of the mesh for the red car. We'll modify the mesh settings and set the color to red.

Creating Paths for the Cars

To create paths for the cars to follow, we'll duplicate the existing path and position it for the second car. We'll ensure that the paths are connected correctly and extend to the desired locations.

Creating the Traffic Lights

To create the traffic lights, we'll use free content from the Epic Games marketplace. We'll import the traffic light models and modify them to include red, yellow, and green lights. We'll also add collision objects to allow the cars to detect the presence of the traffic lights.

Making the Traffic Lights Change Colors

The logic for changing the traffic light colors is straightforward. When the Game starts, there will be a 10-second delay before the lights switch to yellow. After a 2-second delay, the lights will either change to green or red. This process will repeat in a loop.

Making the Cars Recognize the Traffic Lights

To make the cars recognize the traffic lights, we'll use collision events. When the collision object of a car overlaps with the traffic lights, we'll check the state of the traffic light. If the light is green, the car will continue driving. If the light is red, the car will come to a stop.

Testing the Traffic Light System

To test the traffic light system, we'll position the cars near the traffic lights and observe their behaviors. The cars should stop when the traffic light is red and continue driving when it turns green.

Conclusion

Congratulations! You have successfully set up a simple traffic light system using Unreal Engine. You have learned how to correct mistakes, change car colors, create paths for cars, create and modify traffic lights, and make cars recognize and respond to traffic lights. This knowledge can be applied to create more complex systems and simulations in your projects. Enjoy experimenting and have fun with Unreal Engine!

Highlights

• Set up a simple traffic light system in Unreal Engine
• Corrected mistakes from previous tutorial
• Created paths for cars to follow
• Changed car colors to differentiate between them
• Added collision objects to traffic lights for car detection
• Made traffic lights change colors
• Made cars recognize and respond to traffic lights

FAQ

Q: Where can I find the free content for the traffic lights? A: The traffic light models can be found on the Epic Games marketplace. The link to the free content is provided in the description.

Q: Can I use this traffic light system in my own projects? A: Absolutely! You can use the knowledge and techniques learned in this tutorial to implement a traffic light system in your own Unreal Engine projects. Happy coding!