[Spell] Triggered projectiles and unit height?

[sniper_zero]

So I triggered a missile spell with a dummy unit as the missile and it works fine but how do I make it go upwards when targeting air units?

 

[Maker]

You can get the target's flying height and then calculate the change in flying height of the projectile per interval based on the distance.

 

[Doomlord]

You need to use this Jass function to get the height difference then with each missile movement, change its height by height difference/loop count (0.03s will get a loop count of 33)

function GetUnitHeightDifference takes unit u1, unit u2 returns real
local location l1 = GetUnitLoc (u1)
local location l2 = GetUnitLoc (u2)
local real r1 = GetLocationZ (l1)
local real r2 = GetLocationZ (l2)

call RemoveLocation (l1)
call RemoveLocation (l2)

return (r1 + GetUnitFlyHeight (u1)) - (r2 + GetUnitFlyHeight (u2))
endfunction

Use it like this in the cast phase of the spell. HeightChange is a real var.

• Custom script: set udg_HeightChange = GetUnitHeightDifference (udg_Target, udg_Missile)

It may return negative if the missile is higher than the unit. Also, changing height of either unit midflight will cause this to malfunction. You should note that.

 

[sniper_zero]

You can get the target's flying height and then calculate the change in flying height of the projectile per interval based on the distance.

How do you do the calculations? Or rather how do you get the formula?

You need to use this Jass function to get the height difference then with each missile movement, change its height by height difference/loop count (0.03s will get a loop count of 33)

function GetUnitHeightDifference takes unit u1, unit u2 returns real
local location l1 = GetUnitLoc (u1)
local location l2 = GetUnitLoc (u2)
local real r1 = GetLocationZ (l1)
local real r2 = GetLocationZ (l2)

call RemoveLocation (l1)
call RemoveLocation (l2)

return (r1 + GetUnitFlyHeight (u1)) - (r2 + GetUnitFlyHeight (u2))
endfunction

Use it like this in the cast phase of the spell. HeightChange is a real var.

• Custom script: set udg_HeightChange = GetUnitHeightDifference (udg_Missile, udg_Target)

It may return negative if the missile is higher than the unit. Also, changing height of either unit midflight will cause this to malfunction. You should note that.

So I get the height difference using the custom script, divide it by the loop which is .03 and add the answer to that to the missile's height? Am I getting this right?

EDIT: I tried the custom script, and it's giving me two errors. Undeclared function GetUnitHeightDifference and Cannot convert null to real.

 

[Doomlord]

Actually, you divide it by (1/0.03), which is 33.34 btw. And yes you then add that height change value to the missile.

 

[sniper_zero]

Um, how do I get the custom script to work? it gives me these two errors: Undeclared function GetUnitHeightDifference and Cannot convert null to real.

 

[edo494]

you need to copy the script that doomlord wrote to your map header, when you have triggers, click on the map icon(where all the files which have triggers in them splits) and paste this code in there

 

[Doomlord]

When you open the Trigger Editor, there is a map icon with your map name next to it. Click on the icon and paste the JASS function to the space provided. That is called the Map Header, FYI.

edit
Thank you edo ^^

 

[sniper_zero]

Okay, will do. I'll let you guys know how it works out.

 

[sniper_zero]

trigger

• Glacial Blast Loop
  • Events
    • Time - Every 0.04 seconds of game time
  • Conditions
  • Actions
    • Custom script: set udg_HeightChange = GetUnitHeightDifference (udg_GB_unit[1], udg_GB_dummy)
    • Set GB_real = (HeightChange / 25.00)
    • Set GB_speed = 1150.00
    • Set GB_loc[1] = (Position of GB_dummy)
    • Set GB_loc[2] = (Position of GB_unit[1])
    • Set GB_loc[3] = (GB_loc[1] offset by (GB_speed x 0.04) towards (Angle from GB_loc[1] to GB_loc[2]) degrees)
    • Unit - Move GB_dummy instantly to GB_loc[3]
    • Animation - Change GB_dummy flying height to GB_real at 100.00
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • (Distance between GB_loc[2] and GB_loc[1]) Less than or equal to 100.00
      • Then - Actions
        • Trigger - Turn off (This trigger)
        • Unit - Kill GB_dummy
        • Unit - Cause GB_unit[0] to damage GB_unit[1], dealing GB_damage damage of attack type Chaos and damage type Universal
        • Custom script: call RemoveLocation (udg_GB_loc[1])
        • Custom script: call RemoveLocation (udg_GB_loc[2])
        • Custom script: call RemoveLocation (udg_GB_loc[3])
      • Else - Actions
        • Custom script: call RemoveLocation (udg_GB_loc[1])
        • Custom script: call RemoveLocation (udg_GB_loc[2])
        • Custom script: call RemoveLocation (udg_GB_loc[3])

I got the custom script to work but the dummy still won't fly. I've attached my loop trigger above. Can anyone tell me what's wrong with it?

 

[Doomlord]

The height change should be current flying height of dummy + GB_Real. Oh and it should be GetUnitHeightDifference (Gb_dummy, unit [1])

 

[sniper_zero]

So I need to make another real variable?

EDIT: Oh, wait. I think I get what you mean now. I'll work on it as soon as my laptop cools down.

trigger

• Glacial Blast Loop
  • Events
    • Time - Every 0.04 seconds of game time
  • Conditions
  • Actions
    • Custom script: set udg_HeightChange = GetUnitHeightDifference (udg_GB_dummy, udg_GB_unit[1])
    • Set GB_real = (HeightChange / 25.00)
    • Set GB_speed = 1150.00
    • Set GB_loc[1] = (Position of GB_dummy)
    • Set GB_loc[2] = (Position of GB_unit[1])
    • Set GB_loc[3] = (GB_loc[1] offset by (GB_speed x 0.04) towards (Angle from GB_loc[1] to GB_loc[2]) degrees)
    • Unit - Move GB_dummy instantly to GB_loc[3]
    • Unit - Add Crow Form to GB_dummy
    • Animation - Change GB_dummy flying height to ((Current flying height of GB_dummy) + GB_real) at 100.00
    • Unit - Remove Crow Form from GB_dummy
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • (Distance between GB_loc[2] and GB_loc[1]) Less than or equal to 100.00
      • Then - Actions
        • Trigger - Turn off (This trigger)
        • Unit - Kill GB_dummy
        • Unit - Cause GB_unit[0] to damage GB_unit[1], dealing GB_damage damage of attack type Chaos and damage type Universal
        • Custom script: call RemoveLocation (udg_GB_loc[1])
        • Custom script: call RemoveLocation (udg_GB_loc[2])
        • Custom script: call RemoveLocation (udg_GB_loc[3])
      • Else - Actions
        • Custom script: call RemoveLocation (udg_GB_loc[1])
        • Custom script: call RemoveLocation (udg_GB_loc[2])
        • Custom script: call RemoveLocation (udg_GB_loc[3])

Okay, I guess I still don't get it. I tried applying your changes and I even added the crow form to the dummy but it still won't change its height.

 

[Doomlord]

Add and remove Crow Form at cast. Change fly height at 0.00. Move that Gb_Real and HeightChange to the cast trigger too. Oh and I am mistaken back there, it should be (unit, dummy) not vice-versa. Apologies.

 

[sniper_zero]

Now it works! Thank you! But just one last thing. If I have to set the flying height to zero, then the dummy sticks to the ground, which makes it look weird when targeting ground enemies. Is it alright if I add some fly height to the dummy once it's created but before the height difference is calculated?

EDIT: Oh, wait I can't do that right? Otherwise the dummy will go downward instead of keeping the same height. Is there another way to go about it?

2nd EDIT: Actually, never mind. I tried a if/then/else action and it works. Thanks again!

 

[Doomlord]

Either add it to the unit's data or add it before calculating the height difference. I recommend 100. Glad I helped