How to create a circle expanding effect?

In the name of honesty, I have no idea what you just said!

Haha… But you are saying it’s possible to change where an effect is on a material in real time? After doing hours of research, I am starting to think that it isn’t possible to actually change the material in real time, only the mask using SphereMask… So, the effect will always play in the same spot. The video I am trying to recreate (UDK - Shield Effect - YouTube) apparently doesn’t actually change the material in real time like I thought it did - it spawns an entirely new sphere, and somehow changes the position the material is facing, and then deletes the sphere.

So, I guess I’ll take that approach too. So what I need to figure out now is how to change the position of the material…

Could you possible explain how materials work, in terms of how they are created/updated? Why did the guy decide to spawn a new sphere, is it because materials are unchangeable once spawned?

Thanks for the reply and I hope I am making sense…