Shoot object

[Tails]

Oke , so what I want is to make the players vehicle shoot Objects on command.

This works if I do x + 125 but this will always shoot the object into one direction, regardless of the vehicles rotation.

So I tried to add the + 125 to the rX position instead but that didn't work, it just floats up a little bit.

Any bit of help is appreciated.

Part of my script:

  
-- This will shoot the object 125 units from the X position of the players vehicle 
local x,y,z = getElementPosition(theVehicle) 
local rX,rY,rZ = getElementRotation(theVehicle)  
ball = createObject ( 1249, x, y, z +1, rX, rY, rZ) 
moveObject ( ball, 2500, x +125, y, z, rX, rY, rZ ) 
  

  
-- I assumed this would shoot the object 125 units relative to the vehicles rotation but that's not the case, it just floats about 2 inches up. 
local x,y,z = getElementPosition(theVehicle) 
local rX,rY,rZ = getElementRotation(theVehicle)  
ball = createObject ( 1249, x, y, z +1, rX, rY, rZ) 
moveObject ( ball, 2500, x, y, z, rX + 125, rY, rZ ) 
  

Tails

[cs8898]

Hy

had you tried to output all the variables?

it coud be that there is a fail

outputChatBox("foo|bar"..variable.."foo|bar") 

WFG

cs8898

[robhol]

Trigonometry.

Xn = L cos(Rz),

Yn = L sin(Rz)

where the Xn and Yn are relative and must be added to your starting point, Rz is the Z rotation of the vehicle and L is the length of the vector.

My maths might be a bit rusty, so someone will have to let me know if this is DEAD wrong. :3

[Flaker]

This function return x & y coords in front of theElement

function getPositionInFrontOfElement(theElement) 
local rotz = getPedRotation(theElement) 
local x,y,z = getElementPosition(theElement) 
x = x + ( math.cos ( math.rad ( rotz+90 ) ) * 1.2) 
y = y + ( math.sin ( math.rad ( rotz+90 ) ) * 1.2) 
return x, y 
end 

[robhol]

This function return x & y coords in front of theElement

function getPositionInFrontOfElement(theElement) 
local rotz = getPedRotation(theElement) 
local x,y,z = getElementPosition(theElement) 
x = x + ( math.cos ( math.rad ( rotz+90 ) ) * 1.2) 
y = y + ( math.sin ( math.rad ( rotz+90 ) ) * 1.2) 
return x, y 
end 

This looks more correct, I forgot about the radians and the +90° you need because GTA/MTA's rotations don't start at the "real zero". The 1.2 should probably be a parameter to the function instead of a hard-coded number.

[Tails]

Tyvm guys