public class DrawCubes : MonoBehaviour {
  public Mesh cube;
  public int submeshIndex;  //If the mesh has more than one submesh, specify which one to draw. Normally this can be left as 0.
  public Material material; //Note: This material must have instancing enabled.

  private Matrix4x4[] locations;
  void Start() {
    locations = new Matrix4x4[10];
    for (int i = 0; i < locations.length; ++i) {
      //Position at (i,0,0), no rotation, with no scaling
      locations[i] = Matrix4x4.TRS(new Vector3(i,0,0), Quaternion.identity, Vector3.one);
    }
  }
  void Update() {
    Graphics.DrawMeshInstanced(cube, submeshIndex, material, matrices);
  }
}