function round(num, idp)
  local mult = 10^(idp or 0)
  return math.floor(num * mult + 0.5) / mult
end

stereoMultiplier = 0.1
function drawPoint(x,y,z)
    Screen.drawPixel(round(x-z*stereoMultiplier ,0), round(y,0), Color.new(255,0,0), TOP_SCREEN, LEFT_EYE)
    Screen.drawPixel(round(x+z*stereoMultiplier ,0), round(y,0), Color.new(255,0,0), TOP_SCREEN, RIGHT_EYE)
end

Vertex = {};
function Vertex.new(x,y,z)
    local self = {}
    self.x = x
    self.y = y
    self.z = z
    return self
end

vert1 = Vertex.new(0,0,0)
vert2 = Vertex.new(20,20,20)
vert3 = Vertex.new(50,50,50)

Screen.enable3D() --Enabling 3D for the top screen
while(true) do

    Screen.waitVblankStart() -- Screen related stuff
    Screen.refresh() -- Other Screen related stuff
    Screen.clear(TOP_SCREEN) -- Clear top screen
    Screen.clear(BOTTOM_SCREEN) -- Clear bottom screen
    pad = Controls.read() -- Read Controls
    if(Controls.check(pad, KEY_START)) then-- check if start is pressed

        System.exit()-- Exit back to HBL

    end
    Screen.debugPrint(0,0,"Hello World",Color.new(255,255,255),BOTTOM_SCREEN) -- Print onto the bottom screen at (0,0), "Hello World" in white

    drawPoint(vert1.x,vert1.y,vert1.z)
    drawPoint(vert2.x,vert2.y,vert2.z)
    drawPoint(vert3.x,vert3.y,vert3.z)

    Screen.flip() -- More screen related stuff

end