How to launch a 3D character at any angle

[crude dome]

So this is 2 things:
1: Use a timer to figure out how long the player pressed a button, this is your added force (should be a vector).
2: Add that new force (vector) to the existing Velocity.

[fresh swallow]

About 2: How do I calculate the seperate forces on every axis (through a base force and a normal)?

[crude dome]

Why do you need to do it on every axis? You can just add up Vectors?

[fresh swallow]

Sorry, I don't seem to actually need that

Although I want to try it out without the Timer first

[crude dome]

If it's always just "press button x = fly Y", then just hardcode the extra Vector for that extra flying and add it to the existing velocity vector

[fresh swallow]

Pretty sure I'm having a logic error right now, so I think I'll try to base it off of smth else instead, although thanks for the help

I probably don't need something as precise as this tbh

[crude dome]

But this is what you're asking? It's also not "precise"? It's just correct?
Take existing velocity, and add whatever boost you had in mind.

Keep in mind, if that boost is in the opposite direction of the current velocity, it will cancel eachother out.