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how to calculate this?


John Smith

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hi i need somebody to help me with this

show.png

how can i calculate the requried velocity x,y,z arguments to throw player away from the colshape in exact opposite direction?

like if i was coming from left side to the colshape it would throw me on left side, but behind and not front.

please help me if you know how to calculate this direction for setElementVelocity

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  • MTA Team

No compilation errors, but I am not sure if it works.

In one sentence: It takes the angle from the player to the colshape, turns it around (negative) and then applies the velocity (before the impact) to push the player away.

  
function handleShapeHit(contactElement, matchingDimension) 
    if not matchingDimension then 
        return 
    end 
  
    if getElementType(contactElement) ~= "player" then 
        return 
    end 
  
    local x, y = getElementPosition(source) 
    local px, py, pz = getElementPosition(contactElement) 
    local vx, vy, vz = getElementVelocity(contactElement) 
    local speed = math.sqrt(math.pow(vx, 2) + math.pow(vy, 2) + math.pow(vz, 2)) + 0.25 
    local angle = -math.atan2(px - x, py - y) 
  
    setElementVelocity(contactElement, speed * math.cos(angle), speed * math.sin(angle), vz + 0.1) 
end 
  
local col = createColRectangle(-150, -150, 300, 300) 
addEventHandler("onColShapeHit", col, handleShapeHit) 
  

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  • 1 month later...

Your example wasn't working in correct angle

anyway i have tried this thing with a marker(it can be done with colshape too if prefered)

and it's actually very easy to achieve what i tried to do

here's it if anyone needs it

local marker = createMarker(0,0,4,"corona",3,255,0,0,255) 
  
function ion(hitElement) 
   if source == marker then 
      local x,y,z = getElementVelocity(hitElement) 
      setElementVelocity(hitElement,-x,-y,z+0.5) -- throw element away from marker in opposite direction 
   end 
end 
addEventHandler("onMarkerHit",marker,ion) 

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