Camera Tracking - Nuke 101: Professional Compositing and Visual Effects - page 448

12. View Merge3 in the Viewer and make sure to view the RGB channels ( FIGURE
10.42 ) .
Figure 10.42. The reflection is placed perfectly inside the frame.
It's in there—now you just need to take it down a tad.
13. Reduce Merge3's Mix property to 0.05.
The comp is done. You added a very accurate, very sophisticated reflection to the
composite.
To really understand how well this reflection works, render it and view it in
Framecycler. You should know how to do this by now, so I won't bore you with
instructions. (If you need a refresher, see Chapter 1 .)