using UnityEngine;

[RequireComponent(typeof(MeshFilter))]
public class ReverseNormals : MonoBehaviour
{
	private void Start()
	{
		MeshFilter meshFilter = GetComponent(typeof(MeshFilter)) as MeshFilter;
		if (!(meshFilter != null))
		{
			return;
		}
		Mesh mesh = meshFilter.mesh;
		Vector3[] normals = mesh.normals;
		for (int i = 0; i < normals.Length; i++)
		{
			normals[i] = -normals[i];
		}
		mesh.normals = normals;
		for (int j = 0; j < mesh.subMeshCount; j++)
		{
			int[] triangles = mesh.GetTriangles(j);
			for (int k = 0; k < triangles.Length; k += 3)
			{
				int num = triangles[k];
				triangles[k] = triangles[k + 1];
				triangles[k + 1] = num;
			}
			mesh.SetTriangles(triangles, j);
		}
	}
}