; RemoveCameraEffect Example
; --------------------------

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

camera=CreateCamera()
PositionEntity camera,0,0,-5

light=CreateLight()
RotateEntity light,35,-30,0

cube=CreateCube()
EntityColor cube,255,80,20

; Attach a greyscale post effect to the camera
effect=LoadShader("assets/help_post.b3shader")
CameraEffect camera,effect
attached=True

While Not KeyDown(1)

    ; Press Space to remove the effect, or attach it again
    If KeyHit(57)
        If attached
            RemoveCameraEffect camera,effect
        Else
            CameraEffect camera,effect
        EndIf
        attached=Not attached
    EndIf

    TurnEntity cube,0.2,0.4,0

    ; 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

    Color 255,255,255
    Text 0,0,"Space: remove / re-attach the effect   Arrow keys: move camera   Esc: exit"
    If attached Then Text 0,20,"Effect attached - Space calls RemoveCameraEffect camera,effect" Else Text 0,20,"RemoveCameraEffect camera,effect was called - colours are back"

    Flip

Wend

FreeShader effect
End