I have to create a firework using particle systems in DirectX 9 but the math/physics stuff is killing me. I've been fiddling around with this for hours and couldn't get it to work as I want it to, which is why I'm now asking here.
I have a projectile flying physically correct that will burst into smaller particles after some time. I want the particles to be dispersed in a cone-like shape defined by the direction of the original projectile and an angle alpha, that are both known. I tried to make a little sketch of what I want to achieve but if you need clarification, feel free to ask.
I have to determine the velocity/flying direction for the particles. As I said, I know the original projectile's velocity/direction and the angle of the cone but I don't know how to combine these two to achieve what I want.
Please help me. Thank you very much in advance.