; PointEntity Example
; -------------------

Graphics3D 640,480,0,2
SetBuffer BackBuffer()

camera=CreateCamera()
PositionEntity camera,0,2,-10

light=CreateLight()
RotateEntity light,45,45,0

; A turret barrel (long in z, the "forward" axis that PointEntity aims)
barrel=CreateCube()
ScaleMesh barrel,0.2,0.2,1
EntityColor barrel,255,255,0

; A drone that flies loops around the turret
drone=CreateSphere(8)
ScaleEntity drone,0.4,0.4,0.4
EntityColor drone,0,255,0

angle#=0

While Not KeyDown(1)

    ; Fly the drone in a weaving circle
    angle=angle+1
    PositionEntity drone,Cos(angle)*4,Sin(angle*3),Sin(angle)*4

    ; Keep the turret barrel aimed at the drone
    PointEntity barrel,drone

    ; Arrow keys move the camera
    If KeyDown(200) Then MoveEntity camera,0,0,0.1
    If KeyDown(208) Then MoveEntity camera,0,0,-0.1
    If KeyDown(203) Then TurnEntity camera,0,1,0
    If KeyDown(205) Then TurnEntity camera,0,-1,0

    RenderWorld

    Text 0,0,"Arrow keys: move camera   Esc: exit"
    Text 0,20,"PointEntity barrel,drone keeps the barrel aimed at the moving drone"

    Flip

Wend

End