A shadow need something to fall on.
Place a picture like white.png behind and set the size to the length of the scroller.
You can use transparency on the picture layer to your liking even to 0.999 to make it work.
There are other ways but this explains the fundementals.
komies, 5 years ago
BluffTitler supports 3 shadow algorithms. They all have advantages and disadvantages. The user guide explains it all. For simple shows, projected shadows work best:
michiel, 5 years ago