Manually render a frame on demand. This is used in conjunction with the ige.useManualRender(true) call which will cause the engine to only render new graphics frames from the scenegraph once this method is called. You must call this method every time you wish to update the graphical output on screen.

Calling this method multiple times during a single engine tick will NOT make it draw more than one frame, therefore it is safe to call multiple times if required by different sections of game logic without incurring extra rendering cost.