void Awake()
{
if (_map_camera_camera == null){
//create clipping mask for map;
_mask = 1 << 23 | 1 << 19;
//create a new camera;
_map_camera_camera = new GameObject("map_camera");
//add camera and copy attributes of original camera
_map_camera_camera_component = _map_camera_camera.AddComponent<Camera>();
_map_camera_camera_component.CopyFrom(camera);
_map_camera_camera_component.depth = 2;
_map_camera_camera_component.cullingMask = _mask;
_map_camera_camera_component.backgroundColor = Color.black;
_map_camera_camera_component.clearFlags = CameraClearFlags.SolidColor;
//parent and reset it to original camera;
_map_camera_camera.transform.rotation = transform.rotation;
_map_camera_camera.transform.position = transform.position;
_map_camera_camera.transform.parent = transform;
//create a new Render Texture for the map pass and assign it to the Camera
_map_render_texture = new RenderTexture(Screen.width,Screen.height,8,RenderTextureFormat.ARGBHalf);
_map_render_texture.name = "map_pass";
_map_camera_camera_component.targetTexture = _map_render_texture;
//set mask Texture global for all shaders
Shader.SetGlobalTexture("_map_texture", _map_render_texture);
}
}
