Apple Shake 4 Tutorials - Manual (Page 108)

108 Chapter 3 Depth Compositing
5 Connect the DepthKey output to the mask input of the Fade1 node.
6 Click the left side of ZCompose1 to load the result into the Viewer.
The fade effect is definitely varied, but take a close look and you’ll notice that some
elements are fading too soon. You need to adjust the range of the DepthKey.
7 In the DepthKey1 parameters, set loVal to approximately 0.25.
To verify the key, view the alpha channel of the DepthKey1 node. You can adjust the
loVal and hiVal settings to experiment with the range for the fade effect.
This part of the mask is
partially transparent.
After adjustment, the
mask is opaque.