I was trying to find out how much of your scene is rendered in vue 10 that is not seen by the camera.

If I put a tree on an empty scene out side the cameras view point the shadow cast will appear in the view. When the scene renders will it just render the shadow or the unseen tree as well? 

For example ifI want to create a Forest scene, obviously the trees outside my point of view change the light coming in so I place trees that can not be seen but their shadows can be and the way they change the light will be seen. As I always need to conserve resources when using vue I don't want to render Hi Res trees that will not be seen but take up resources. If only the shadows render then it probably makes very little difference. 

You may wonder why not just put lowRes trees out side the

 

cameras view, it just saves swapping them round if I need to adjustment the cameras position. Hope I've managed to explain this clearly enough, thanks in advanced for any help

HopeI've e