First, make sure you have at least Fraxy version July 23rd or later. Next, this is event based so if you don't understand events you may have a bit of trouble with this. The parameters are located under event action "Part Status > Change extra param".
You should set all 4 parameters in the same event (at least for the first one - additional events may/may not work!), otherwise there may be errors (unconfirmed) it probably won't behave properly.
These parameters only work like this on these parts: {Bullet/small/twin, Burner, Grenade, Needle Gun, Plasma Ring, Power Ball, Ripple, Slow Ray, Vulcan (all forms)}
(note that Homing Lasers use Extra Parameters differently)
Use of the parameters on parts not mentioned in that list may cause errors (the value limits are different, and they do different things).
Parameter 1: Speed Cycle count
- This one makes the bullet "bounce", if you set it to 0 (default) then the weapons work like normal, if you set it to something like 10, the bullets will have a wave-like speed.
(To be specific, this is the number of trips from the speed at Parameter 2 to the speed at Parameter 3 during the lifetime of the bullet)
- Value limits: {1 to infinity} - anything less than 0 will error (0: no Extra Params are used)
- Recommended value: {1~10} - anything above this might start to look and behave weird, this is the best range of values to use if you want the weapon to still be useful :P. Feel free to experiment, as always.
- (note: to have the speed constant, just use 1 for this and set Parameter 2 and Parameter 3 to the same value)
Parameter 2: First Limiting Speed of bullets
- This sets the initial velocity/speed of the bullets and (when Parameter 1 > 2) one of the two extremes of the speed cycling.
- Value limits: {-4000 to 4000} - anything else will error
Parameter 3: Second Limiting Speed of bullets
- This sets the other extreme of the speed cycling (if Parameter 1 > 2). if Parameter 1 = 1, then this will be the ending speed for the bullet.
- Value limits: {-4000 to 4000} - anything else will error
Parameter 4: Curve Angle
- This will make the bullets "curve" a certain direction.
- Value limits: {-4096 to 4096} - anything else will error
- Recommended limits: {-256 to 256} - otherwise you might get undesirable behavior (feel free to experiment of course, this is just a guideline)
Note that the Homing Laser uses the parameters differently.
Parameter 1: ON/OFF flag
-This turns on the usage of othe other three Parameters.
-Value limit: {0/1}
Parameter 2: Maximum Speed.
-This is the maximum speed of the bullets. this is also the speed that the bullets are fired at.
-Value Limits: {0~3000}
Parameter 3: Reaction to movement. (?????)
-this is how responsive the bullets are to you moving. 100 = normal.
-Value Limits: {0~300}
Parameter 4: Maximum Rotation Rate
-This is how much it can rotate at a given time when chasing you.
-Value Limits: {0~256} (really, now, who would use 0 angle rotation on HOMING LASERS?)
Example Image below

One Example out of One Billion Billions of what you can do.

Made with ONE vulcan cross! -NUTMAN217
Don't believe me? Look for yourself.
Comments (14)
NightKev said
at 9:34 pm on Jul 23, 2008
If you guys are still confused after reading the tutorial and experimenting, post a comment here. I might make a YT video explaining things (visual aids are always nice, eh? :P) if needed.
Anonymous said
at 10:20 pm on Jul 23, 2008
I THINK I got it, but I'm sure a lot of people would find a video to be a little easier to follow, since they can see exactly where they're going and in which order.
NightKev said
at 11:01 pm on Jul 23, 2008
Okay, I'll make one later. Eating right now.
NightKev said
at 12:38 am on Jul 24, 2008
Nevermind, I can't. Video card can't handle it (if only I could use the new one I got... grr hardware...).
Anonymous said
at 2:00 am on Jul 24, 2008
Whenever then ;D
Anonymous said
at 1:12 pm on Jul 24, 2008
Param1 is how many "trips" the speed makes from the initial speed to the end speed over the course of the bullet's lifetime, and must be set to 1 or above for the other parameters to have any effect. every odd trip (1, 3, 5, ...) is from Param2 to Param3, every even trip (2, 4, 6, ...) is from Param3 to Param2. Param4 is unaffected by this. additionally, Homing Lasers have a different application of the Parameters (and Param1 is boolean in that case alone - 1 if on, 0 if off)
Nutman217 said
at 3:12 pm on Jul 24, 2008
I knew there was a pattern in screwing with Par1!
Nutman217 said
at 3:13 pm on Jul 24, 2008
Now I know how to screw with it better! :D
Screature said
at 7:51 am on Jul 25, 2008
I've been very busy at both home and work so haven't had chance to play with extra params. Can you set the value of a parameter to a variable? Can you dynamically alter the values of the parameters frame by frame? What I mean is, what if I want a sweeping motion when a single fixed needlegun fires. The angle (fourth param?) would need to go from negative to positive linearly (or vice versa, whatever). Needlegun action 5 is constant-fire, so I'd love to be able to increment/decrement the 4th param in a looping event, without having to manually change it, and see what comes up. This could also work well with a single burner that has a sweeping motion of fire.
Screature said
at 7:55 am on Jul 25, 2008
OMG just THINK of the touhou/danmaku/bullet-hell possibilities that are now possible with these extra parameters! With the ability to curve bullets, and change their speed, you'll be able to completely recreate almost ANY pattern the touhou games are capable of.
Screature said
at 8:07 am on Jul 25, 2008
Well......not really......but you know what I mean. It still opens up many new ideas!
Anonymous said
at 2:44 pm on Jul 26, 2008
...as of the last release, extra parameters cannot be given a variable's value (don't see why not unless it's impossible to safely change extra parameters while the enemy is shooting)
Anonymous said
at 2:48 pm on Jul 26, 2008
I just checked, and yes, you can change the extra parameters more than once, and even while the gun is firing. it only affects new bullets/shots, though.
bukkarooo said
at 4:57 pm on Jul 26, 2008
Quick note: if you set parameters onto a vulcan weapon, when the boss is destroyed, the scattered vulcans (on higher ranks) follow the parameters
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