Fist time really working with lua and with my essentially no experience with it I have run into what is probably a simple error, but I do not know how to fix it.

Here is the section of code where the error is coming from
The code is attached to an MOSRotating that is a bullet that I am attempting to make start at a low velocity of 20 (set by FireVelocity in the Round) and speed up constantly after 500ms until it hits a maximum velocity.

There's actually an easier, and more efficient* way, to do this. You can have the bullet emit particles (invisible if you want them to be) out the back of the bullet and have these emissions push the bullet. Here's how it's done with the Ronin Fraction's Rocket Launcher:


*Pardon my lecture, but if your able to do something though a .ini mod, as apposed to a Lua script, it's better to take the .ini mod route. Anything defined in the .ini mod is handled directly by the engine code. Lua scripts, when run, are constantly being interpreted into engine code and then executed by the engine, making them more resource heavy.

However, since your script doesn't involved a lot of code, I don't think the extra resource tax will matter much, unless there will be like 60+ of these bullets on screen at once.

However, if you prefer to do it in Lua, here's what's wrong with your script:

self.Vel is defined by the game as a "const Vector," which from my experiences means vector functions don't work on them. You'll have to make a new vector, set it's magnitude with SetMagnitude(), and then add (since this time it's a vector) it to self.Vel.

I have never noticed the Ronin 'zooka, or any of the vanilla launchers, accelerating after the initial shot, and that is not the effect I am going for.

I had actually been working on it for a long time as just an .ini edit trying to get various AEmitters to work based on p3lb0x's Dummy APRL, but could not get it to act in a good fashion. Good meaning hits and causes at least some damage at all ranges and is not reliant on gibbing into an explosion to cause that damage, and does not ricochetting off things and hitting the shooter... So I gave up to see if I could do it easier with lua.


Thanks, spliced that into my code like soand I am no longer getting the error, but bullet does not appear to speed up at all. and I still get that original error and the bullets still always speed up and zip off the the right rather than in the direction it was fired in.

That will work unless there's some typoes. Also, you don't want to add 50 to the magnitude every frame.

Thanks piipu, that works a little bit better. It is now going left or right depending on which direction it is shot, but it has no vertical gain or drop, and is doing a strange gittery thing

I have no idea what the code for it would look like, but would determining the direction of travel when it is created and trying to apply velocity increases to that work?

Just negating the Y component should work. Replace the self.Vel = stuff line with that.
Edit: Oops, forgot to actually negate it. Oh well, should work better now.

Great, that work. Now to teak things so it accelerates as fast as I want it to, and I need to figure out how to deal with the initial drop due to low velocity.

GlobalAccScalar?

Bleah, yeah... that was it. Thanks for pointing out the obvious.
Apparently when I scrapped all the AEmitters that emitted AEmitters like the DAPRL, I did not carry over the GlobalAccScalar into my new MOSRotating. It flies mostly straight now.
Now I have to get it to actually cause damage.