Lets say you wanted to make an explosion, blowing an object up and making debris fly at the screen, of course rather than using CG fire which a lot of the time looks, well... CG. You might want to use stock footage, video footage of fire which you can overlay into your 3D scene making the explosion look a lot more realistic.

Of course the first problem of doing this is the fact that the footage is 2D!
It’s a flat image, rather than being 3D and having depth, so throwing it into your scene will look cool, but if you want it to interact with the geometry and have debris fly through it it’s going to be quite difficult, because it’s either behind the explosion or in front, it won’t be inbetween since it’s just a flat 2D sprite, so that’s going to look quite fake.

So that’s what this tutorial will cover, how to make debris and objects shoot out of an explosion and actually look like they shoot out, and also look cool and easy to set up. ...