GetGroundPosition: Difference between revisions

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m (Fixed typo; improved example)
 
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--we'll check for ground level at the player's position, and also 500 units over him.
--we'll check for ground level at the player's position, and also 500 units over him.
--if these ground levels match, it must mean there were no obstacles (such as a ceiling) over the player,
--if these ground levels match, it must mean there were no obstacles (such as a ceiling) over the player,
if getGroundPosition ( px, py, pz ) == getGroundPosition ( px, py, pz + 530 ) then
return getGroundPosition ( px, py, pz ) ~= getGroundPosition ( px, py, pz + 530 )
-- so the player is not under cover
return false
--otherwise, there was an object over him,
else
-- so the player is under cover
return true
end
end
end
</syntaxhighlight>
==Another example==
This clientside function returns the distance between you and the ground (if there is)
<syntaxhighlight lang="lua">
function getGroundDistance( thePlayer, zHeight  )
local x,y,z = getElementPosition(thePlayer) -- get position
    local groundPosition = getGroundPosition(x,y,z) -- get default ground pos
local hit, x1, y1, groundPosition = processLineOfSight(x,y,z+1,x,y,z-(zHeight+0.7))  -- using zHeight get a better ground position
local distance = getDistanceBetweenPoints3D(x, y, z, x,y, (groundPosition or z))  -- get distance between both positions
return distance -- return the distance
end
-- Some cool examples: 
addCommandHandler("gdistance",function(_, amount)
    local distance = getGroundDistance(localPlayer, tonumber(amount))
    outputChatBox("The distance to reach ground is: " .. distance)
end)
addCommandHandler("do_im_flying",function()
    local distance = getGroundDistance(localPlayer, 20)
    if distance > 1 then
        outputChatBox("Superman!! the distance between you and ground is: " .. distance)
    else
        outputChatBox("naah")
    end
end)
</syntaxhighlight>
</syntaxhighlight>


Latest revision as of 05:23, 12 December 2023

This function gets the Z level of the highest ground below a point.

It is required that the point is near enough to the local player so that it's within the area where collision data is loaded. If this is not the case, an incorrect position will be returned.

Syntax

float getGroundPosition ( float x, float y, float z )

Required Arguments

  • x: A floating point number representing the X world coordinate of the point.
  • y: A floating point number representing the Y world coordinate of the point.
  • z: A floating point number representing the Z world coordinate of the point.

Returns

Returns a float with the highest ground-level Z coord if parameters are valid, 0 if the point you tried to test is outside the loaded world map, false otherwise.

Example

This clientside function determines if a player is under a ceiling or not. 

function isPlayerUnderCover ( thePlayer )
	--we get the player's position
	local px, py, pz = getElementPosition ( thePlayer )
	--we'll check for ground level at the player's position, and also 500 units over him.
	--if these ground levels match, it must mean there were no obstacles (such as a ceiling) over the player,
	return getGroundPosition ( px, py, pz ) ~= getGroundPosition ( px, py, pz + 530 )
end

Another example

This clientside function returns the distance between you and the ground (if there is) 

function getGroundDistance( thePlayer, zHeight  )
	local x,y,z = getElementPosition(thePlayer) -- get position
    local groundPosition = getGroundPosition(x,y,z) -- get default ground pos 
	local hit, x1, y1, groundPosition = processLineOfSight(x,y,z+1,x,y,z-(zHeight+0.7))  -- using zHeight get a better ground position
	local distance = getDistanceBetweenPoints3D(x, y, z, x,y, (groundPosition or z))  -- get distance between both positions 
	return distance -- return the distance
end

-- Some cool examples:  
addCommandHandler("gdistance",function(_, amount)
    local distance = getGroundDistance(localPlayer, tonumber(amount))
    outputChatBox("The distance to reach ground is: " .. distance)
end)

addCommandHandler("do_im_flying",function()
    local distance = getGroundDistance(localPlayer, 20)
    if distance > 1 then 
        outputChatBox("Superman!! the distance between you and ground is: " .. distance)
    else 
        outputChatBox("naah")
    end 
end)

See Also

Retrieved from "https://wiki.multitheftauto.com/wiki/GetGroundPosition?oldid=78659"