SO Coords

local picking, testMarker, zDifference

function pickPosition()
    if (not picking) then
        return false
    end
    if (not isCursorShowing()) then
        return false
    end
    local dumpx, dumpy, worldX, worldY, worldZ = getCursorPosition()
    local px, py, pz = getCameraMatrix()
    local hit, x, y, z, elementHit = processLineOfSight(px, py, pz, worldX, worldY, worldZ)
    if (not hit) then
        return false
    end
    z = z + zDifference
    if (getKeyState("mouse1")) then
        local zone, city = getZoneName(x, y, z), getZoneName(x, y, z, true)
        outputChatBox(x .. " " .. y .. " " .. z)
        outputChatBox(zone .. ", " .. city)
        toggleListening()
        createMarker(x, y, z, "cylinder")
        return true
    elseif (getKeyState("num_8")) then
        zDifference = zDifference + 0.01
    elseif (getKeyState("num_2")) then
        zDifference = zDifference - 0.01
    end
    setElementPosition(testMarker, x, y, z)
    local text = "X: " .. x .. ", Y: " .. y .. ", Z: " .. z
    dxDrawText(text, 0, 0, 0, 0)
end

function toggleListening()
    picking = not picking
    if (picking) then
        showCursor(false)
        outputDebugString("Stopped picking")
        picking = false
        destroyElement(testMarker)
        testMarker = nil
        return false
    end
    showCursor(true)
    testMarker = createMarker(0, 0, 0, "corona", 0.15, 255, 0, 0)
    removeEventHandler("onClientRender", root, pickPosition)
    addEventHandler("onClientRender", root, pickPosition)
    outputDebugString("Started picking")
    picking = true
    zDifference = 0
end
addCommandHandler("tc", toggleListening)