Mask expansion effect
Hey everyone, I've been a bit boggled trying to recreate an effect that I've seen in a documentary called WW2 in space.
The effect that I'm talking about is shown between: 37.25-37.41
I've figured out that its essentially an expanding mask, key framed to increase over time, with maybe some feathering. The effect looks pretty cool, and I've tried it with images, and planes/ grades, but I cant seem to get it to have that firey, sparky glow on the edge as the mask expands. And also how the colour of the mask subtly changes as it expands, I would like it to look similar to this.
I'm using hitfilm 4 express, so maybe it requires some sort of particle type effect.
Any suggestions would be much appreciated. Feel free to ask for clarification if necessary.
Thanks for the help.