ZBrushCentral

What's the name of this function

So some time ago, I saw a video of someone placing a ZBrush model into a photo/picture. Adjusting light and shadow of the render to that of the photo.

I believe it was a model of a statue placed in a in a city square.

Can someone help me with the name of this feature in ZBrush? And is there a good tutorial for this?

http://docs.pixologic.com/?s=Background+image