What it will do is simulate a phaser hitting the front and that portion of the shield will show nothing else, this uses standard Imagine 2.9 textures without any Essence ones.
Column One Two
____ ____
0 0.4 Axis position: 81, 0, -0.9
20 0.4
30 0
20 0
10 255
5 0
4 0
0.4 0
(The main difference with Charles Blaquiere tip is that the colour you put on the texture is the colour of the shield, usually green :)
You'll see an energy blast hit the front (or wherever) of the shield flare up (and if you want) dissipate; you can change how transparent the shield is by changing the fog length :)