Sets the region affected by this animation. This is similar to calling Animation:GetParent():SetParent(), however the assignment is persistent across the script handler chain of any playback starting before another call to Animation:SetTarget() is made. In other words, a call to :GetParent():GetParent() within the animation's 'OnFinished' script will return the targeted region even when its real-time execution has happened after other :SetTarget() statements.