Shadows Setup Node
You can use the Shadows Setup node to add or remove sun shadow maps over several frames in a sequence.
To add a Shadows Setup node in the Track View
In the Track View, right-click the sequence (top node) or the Director node in the tree, and then choose Add Shadows Setup Node.
Select the GSMCache key under the ShadowsSetup node.
Double-click to position the key on its highlighted row in the timeline.