Defining the height

[Diehard@Azeroth]

How do we define the height of a bullet in a linear movement? so the height changes realistically with the movement? I know the funcs to get Z and x and y angle, rect and such, so u can just explain it mathematically, dont need to know what functions are needed. Thank you for your time. Il make sure to give you credit for the math help, a web page simply explaining the *correct* math behind it is alright too.

 

[Element of Water]

I don't understand what you mean. You it stays at the same height, no matter what terrain is beneath it? Basically you subtract the terrain height from whatever height you want the unit to be at, and add the starting terrain height. Say you want it to stay at height 100, every time you move it you do something like:

//assume the height of the terrain is in a variable called "currentTerrainHeight"
//and the terrain height it started at is in variable "startTerrainHeight"
//and the dummy unit is in variable "dummy"
call SetUnitFlyHeight(dummy, 100. + startTerrainHeight - currentTerrainHeight, 0.)

 

[Diehard@Azeroth]

o no man, not what i mean. like the height change in Elim tourny, how bullets go in a linear line and with some fixed height change depending on the location z of each loc. On another hand, how about if this is a constant dynamic changing factor. Like the start terrain height - beginning terrain height + original height of missile, adding that height difference? Hmm you do know what im saying right bro?

so how about height difference*timeupdate + unit current flying height? but yea it changes depending on terrain height, but i think this works for missiles going up or down. any input on it bro?

 

[Pharaoh_]

• Set Point1 = (Position of (your unit))
• Custom script: set udg_Z_Loc = GetLocationZ(udg_Point1)
• Animation - Set (your unit)'s flying height to ((Flying Height of (Your unit)) + (Z_Loc))
• Custom script: call RemoveLocation (udg_Point1)

 

[Diehard@Azeroth]

Pharaoh, No. ;P
im trying to do linear bullet movement not making it in height with terrain xD
thanks for suggestion bro ^^ but if u know what im talking about when im saying linear movement and if u could help out with getting correct height, then please do ))

 

[baassee]

ehum you mean a parabola?

 

[Kricz]

Do you mean this ??

 

[Diehard@Azeroth]

Not a parabola my friend, for that is an arc. I am looking for a linear movement with correct height change, resembling a correct bullets movement. ill do the collision myself so its fairly alright ^^ Thanks for putting up links and everything guys ) appreciate it
edit~~ i need to +rep you guys, you did attempt to help afterall (goes for pharaoh you and basee ^^)

omg... cant give to krics.. need to spread; how nice lawl

 

[The Reborn Devil]

I think this is what you're looking for:

globals
    constant hashtable h = InitHashtable()
endglobals

function Loop takes nothing returns nothing
    local timer t = GetExpiredTimer()
    local unit u = LoadUnitHandle(h, GetHandleId(t), 1)
    local real x = GetUnitX(u) + 4.
    local real y = GetUnitY(u) + 4.
    local location l = Location(x, y)
    local real z = LoadReal(h, GetHandleId(t), 2)-GetLocationZ(l)
    call SetUnitPosition(u, x, y)
    call SetUnitFlyHeight(u, z, 0.)
    set z = z + GetLocationZ(l)
    call SaveReal(h, GetHandleId(t), 2, z)
    set t = null
    set u = null
endfunction

function Example takes unit u returns nothing
    local real x = GetUnitX(u)
    local real y = GetUnitY(u)
    local location l = Location(x, y)
    local real z = GetUnitFlyHeight(u)+GetLocationZ(l)
    local timer t = CreateTimer()
    call UnitAddAbility(u, 'Amrf')
    call UnitRemoveAbility(u, 'Amrf')
    call SaveUnitHandle(h, GetHandleId(t), 1, u)
    call SaveReal(h, GetHandleId(t), 2, z)
    call TimerStart(t, 0.03, true, function Loop)
    call RemoveLocation(l)
    set l = null
    set t = null
endfunction

 

[Diehard@Azeroth]

hmm... this makes it move like a bullet in a linear movement? well the z height atleast? cus i see you subtracted it by the locations height which means the bullet will always have go downward and not upwards? tho i think its really interesting physics u applied there tho thanks! ;P

 

[The Reborn Devil]

That will make the unit "u" in this case move like a bullet, just a lot slower .

 

[Diehard@Azeroth]

Thanks ) il try it bro, i think i +reped you already tho ))
il use intercept movement, i only need the height, so il try it )
----> still gotta strengthen my knowledge of OOP... meh, just started jass but what the hell, gotta try doing that oop shit, thanks bro
<i think il try storing in dat array or something... if i dont get syntax errors lawl>

 

[Element of Water]

That's not OOP. That's a simple timer loop with a hashtable.

 

[Arnadath]

Except of that i think a very good way to make a bullet dummy in linear movement incline/decline, is to make a dummy that fires the bullet (and has infinite range) and another that has variable flying height which will be hited.

 

[Element of Water]

Except then you wouldn't be able to check if it hit anything on its way.

 

[Diablo-dk]

If i understand you right, you want your bullets to move in a three dimensional direction, like they do in elimination tournament. If yes, then this should solve your problem:

  local real xspeed = 100*Cos(Angle)*Cos(ZAngle)
  local real yspeed = 100*Sin(Angle)*Cos(ZAngle)
  local real zspeed = 100*Sin(ZAngle)

 

[Element of Water]

The question was how to keep the bullet at the right height independent of the terrain. He didn't ask about 3D movement.

 

[Yixx]

Think about it. The fixed height you want is let's say 300. The terrain height is at place one 100. Then you set it's flying height to (300-100). Now a second later, the terrain height is 200. Then you set it's flying height to (300-200).

Fixed Height = Terrain Height + Unit Fly Height.

The only thing you can set about a unit in this aspect is it's flying height. So we got the simple equation:
Unit Fly Height = Fixed Height - Terrain Height.

 

[Diehard@Azeroth]

the thing is, the math behind it, what it is, not making it in line with terrain, just making a realistic bullet movement like in elim ) hopefully il try devils way and it works

yes yixx, u prurposed that after Devil did, but il still give you rep )

only problem with that is that it does not spawn from from some height, and spawns the bullet above the unit itself :]

problem is it neds to be dynamic movemnt, not static movement, like height increases in time or decreases in time :]
------------------------------
diablo, man wait, i thik urs can work really well, but i dont think it increases or decreases in time. should i just set a specific rate in the rate parameter? i think that may work, but the rate must be based on dist, atleast i think so >_<

btw i think the speed should be modifiyable, not set at a specified real like you did there, the 100 * angles, you mean 100 is the speed in that case and the speedx + speedy is the movement ?

 

[Diablo-dk]

I'm not sure i understand what you're saying, but i'll try:

When you say rate parameter, do you mean the "100" in the formula? If yes, then i think i know what you're saying. The "rate" parameter is the amount of distance you want to move the bullet.

If you're moving the bullet with a timer, you set the rate to how far you want it to move every second, and multiply it with the period of the timer.

Edit: Yeah, it's exactly like you say in the edit. The 100 is the speed(was just a random number) and the speedx, speedy and speedz are the movement.

 

[Diehard@Azeroth]

, il use the *time, thanks alot bro, il try it out, btw how does it feel starting mapmaking for so long and still going at it? nvm about the parameter rate, i meant by it the rate of the conversion of the units height, like set unit fly height unit u to height 300, rate 300 (which is 1 second, you prob know that tho) so thats what i meant ) its ok now il just use that speed and * it ^^

kk il try it tommorow, since i just started jass like what... yesterday, but! i saw alot of jass scripts, so now i gotta focus on learning the OOP bullshit ;p thanks

 

[Element of Water]

No, you didn't understand what he meant at all...

Timer interval means the duration of the timer, not how long the bullet has lasted so far...

 

[Diablo-dk]

btw how does it feel starting mapmaking for so long and still going at it?

Feels like steak.

 

[Element of Water]

Feels like steak.

What's a cow's arse got to do with map making? [/offtopic]

 

[Diablo-dk]

Both of them can be frustrating at times, yet they are both worth it all [/nonsense]

 

[YourNameHere]

If i understand you right, you want your bullets to move in a three dimensional direction, like they do in elimination tournament. If yes, then this should solve your problem:

  local real xspeed = 100*Cos(Angle)*Cos(ZAngle)
  local real yspeed = 100*Sin(Angle)*Cos(ZAngle)
  local real zspeed = 100*Sin(ZAngle)

So, I assume the 100 are the actual flying height. But still, how does one get the ZAngle? (might be a dumb question - I suck at maths and physics :/)

 

[Element of Water]

Er, well the z angle is just whatever you want it to be.

0 = straight forwards

90 = straight up

180 = striaght backwards

270 = straight down

360 = 0 = straight forwards

Or anything in between...

 

[YourNameHere]

ah ok, thanks.