# triangles

> An array containing all triangles in the Mesh.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public int[] triangles { get; set; }
```

### Remarks

The array is a list of triangles that contains indices into the vertex array. The size of the triangle array must always be a multiple of 3. Vertices can be shared by simply indexing into the same vertex. If the Mesh contains multiple sub-meshes (Materials), the triangle list will contain all the triangles belonging to all its sub-meshes. When you assign a triangle array using this function, the [Mesh.subMeshCount](/engine/6000.0/script-reference/unityengine/mesh/submeshcount.md) is set to 1. If you want to have multiple sub-meshes, use [Mesh.subMeshCount](/engine/6000.0/script-reference/unityengine/mesh/submeshcount.md) and [Mesh.SetTriangles](/engine/6000.0/script-reference/unityengine/mesh/settriangles.md).

It is recommended to assign a triangle array after assigning the vertex array, in order to avoid out of bounds errors.

```csharp
// Builds a Mesh containing a single triangle with uvs.
// Create arrays of vertices, uvs and triangles, and copy them into the mesh.

using UnityEngine;

public class meshTriangles : MonoBehaviour
{
    // Use this for initialization
    void Start()
    {
        gameObject.AddComponent<MeshFilter>();
        gameObject.AddComponent<MeshRenderer>();
        Mesh mesh = GetComponent<MeshFilter>().mesh;

        mesh.Clear();

        // make changes to the Mesh by creating arrays which contain the new values
        mesh.vertices = new Vector3[] {new Vector3(0, 0, 0), new Vector3(0, 1, 0), new Vector3(1, 1, 0)};
        mesh.uv = new Vector2[] {new Vector2(0, 0), new Vector2(0, 1), new Vector2(1, 1)};
        mesh.triangles =  new int[] {0, 1, 2};
    }
}
```

Additional Resources: [Mesh.SetTriangles](/engine/6000.0/script-reference/unityengine/mesh/settriangles.md), [Mesh.SetIndices](/engine/6000.0/script-reference/unityengine/mesh/setindices.md).