Mesh and mesh renderer in Unity - Mini Project: Build & Apply

Create a Simple Colored Triangle with Mesh and MeshRenderer in Unity

📖 Scenario: You are making a simple 3D scene in Unity. You want to create a triangle shape from scratch using code. This triangle will be visible in the scene with a color.

🎯 Goal: Build a Unity script that creates a Mesh with three vertices forming a triangle, assigns it to a MeshFilter, and adds a MeshRenderer with a simple material so the triangle is visible in the scene.

📋 What You'll Learn

Create a Mesh with exactly three vertices forming a triangle

Define the triangle's vertex indices correctly

Add a MeshFilter component and assign the created mesh to it

Add a MeshRenderer component and assign a basic material

Use a GameObject to hold the mesh and renderer

💡 Why This Matters

🌍 Real World

Creating custom 3D shapes programmatically is useful for procedural generation, custom effects, or tools in game development.

💼 Career

Understanding Mesh and MeshRenderer components is essential for Unity developers working on 3D games or simulations.

1

Create a new GameObject and define the triangle vertices

Write code to create a new GameObject called triangleObject. Then create a Mesh called mesh and define its vertices as a Vector3 array with these exact points: (0, 0, 0), (0, 1, 0), and (1, 0, 0).

Unity

// Create a new GameObject and define the triangle vertices
// Your code here

Need a hint?

Use new GameObject("Triangle") to create the object. Then create a new Mesh and assign the vertices property with a Vector3 array of three points.

2

Define the triangle indices for the mesh

Add code to set the triangles property of the mesh to an integer array with these exact values: 0, 1, 2. This defines the order of vertices to form the triangle.

Unity

GameObject triangleObject = new GameObject("Triangle");
Mesh mesh = new Mesh();
mesh.vertices = new Vector3[] { new Vector3(0, 0, 0), new Vector3(0, 1, 0), new Vector3(1, 0, 0) };
// Define the triangle indices
// Your code here

Need a hint?

The triangles array tells Unity which vertices to connect. Use mesh.triangles = new int[] { 0, 1, 2 };.

3

Add MeshFilter component and assign the mesh

Add a MeshFilter component to triangleObject and assign the mesh you created to its mesh property.

Unity

GameObject triangleObject = new GameObject("Triangle");
Mesh mesh = new Mesh();
mesh.vertices = new Vector3[] { new Vector3(0, 0, 0), new Vector3(0, 1, 0), new Vector3(1, 0, 0) };
mesh.triangles = new int[] { 0, 1, 2 };
// Add MeshFilter and assign mesh
// Your code here

Need a hint?

Use AddComponent<MeshFilter>() on the GameObject, then set its mesh property.

4

Add MeshRenderer and assign a basic material

Add a MeshRenderer component to triangleObject. Then create a new Material using Shader.Find("Standard") and assign it to the material property of the MeshRenderer.

Unity

GameObject triangleObject = new GameObject("Triangle");
Mesh mesh = new Mesh();
mesh.vertices = new Vector3[] { new Vector3(0, 0, 0), new Vector3(0, 1, 0), new Vector3(1, 0, 0) };
mesh.triangles = new int[] { 0, 1, 2 };
MeshFilter meshFilter = triangleObject.AddComponent();
meshFilter.mesh = mesh;
// Add MeshRenderer and assign a material
// Your code here

Need a hint?

Use AddComponent<MeshRenderer>() and create a new Material with the standard shader.