Apple Shake 4 Tutorials - Manual (Page 38)

38 Chapter 1 Shake Basics
4 Arrange the nodes as shown in the illustration below.
Composite the soft shadows first.
5 Select the Over1 node, then add a Layer–lMult node to the tree.
6 Connect the shadows image to the second input.
Rather than place one image over another, the lMult node multiplies pixel values
together. For this reason, it doesn’t matter that the shadows image is connected to the
second input. The shadow image is multiplied into the existing image, not placed on
top of it. Here is the result:
Now you have some nice soft shadows in the nooks and crannies, but they might be a
little too dark. You can adjust the amount that the first input is multiplied by the
second input.