function onLoad()

planetLocations = {}
planetLocations[1] = {}
planetLocations[2] = nil
planetLocations[3] = nil

planetRelativeLocations = {}
planetRelativeLocations[1] = {0,1,0}
planetRelativeLocations[2] = {0,0,0}
planetRelativeLocations[3] = {0,0,0}
yOffset = 0
recalibratePlanetLocations()





  button_parameters = {}
  button_parameters.position = {0,1,0}
  button_parameters.click_function = 'test1'
  button_parameters.label = "test1"
  button_parameters.function_owner = self
  button_parameters.width = 500
  button_parameters.height = 500
  button_parameters.color = {0,0,0}
  button_parameters.font_size= 250
  button_parameters.font_color= {1,1,1}

  self.createButton(button_parameters)
end

function test1()
  highlightPlanets()
end

function highlightPlanets()
  for i,j in pairs (planetLocations) do
    if planetLocations[i] ~= nil then
      highlightAtLocation(j, 3)
    end
  end
end

function highlightAtLocation(coord, r)
  recalibratePlanetLocations()
  --print("coords: "..coord[1]..", "..coord[2]..", "..coord[3].."; radius: "..r)
  local onPlanet = findInSphere(coord, r)
  for i, j in pairs (onPlanet) do
      if j.hit_object.getName() == "Infantry" then
      j.hit_object.highlightOn({0.5,1,0.8})
    end
  end
end

function recalibratePlanetLocations()
  for i,v in pairs (planetRelativeLocations) do
    if planetLocations[i] ~= nil then
      planetLocations[i][1] = planetRelativeLocations[i][1] + self.getPosition()[1]
      planetLocations[i][2] = planetRelativeLocations[i][2] + self.getPosition()[2] + yOffset
      planetLocations[i][3] = planetRelativeLocations[i][3] + self.getPosition()[3]
    end
  end
end

function findInSphere(x, r)
  local CastVectorOrigin =
  {
    x[1],
    x[2],
    x[3]
  }

  return Physics.cast({
    origin=CastVectorOrigin,
    type=2,
    size={r,r,r},
    max_distance = 4,
    direction = {0,1,0},
    debug = true
  })
end