public void OnWillRenderObject()

This function is called if the object is deemed visible from the current camera after the culling process. The method is useful if you need a preparation step for every camera that is rendering the object. One example of this is rendering reflection onto a render texture. The reflection will be different for every camera's view point, and needs to be rendered before the original object. If the object gets culled away by a given camera, the reflections for that object will be skipped. For usage in a proper context, see the script /Water.cs/ in Assets-\>Import Package-\>Effects. Note that will be set to the camera that will render the object. Also, this is called multiple times per frame.