RwBeginCameraUpdate(RwCamera *cam, void *param);
param A handle to the output window (if any). If the results of the rendering operations following RwBeginCameraUpdate() are to be displayed in an output window by RwShowCameraImage() the handle of the output window must be passed as the argument param. If the rendering is not to be displayed in a window (for example, if it is to be printed) pass param as NULL. Note, it is also necessary pass a DC associated with the output window when RwShowCameraImage() is called.
RwBeginCameraUpdate(camera, (void *)window);