Is your Texture repetitive?
It may be just an optical illusion that appears to be moving sideways because of the movement of the camera and positioning of the texture 'tiles'
Try making the step sizes MUCH smaller, see if this looks like the movement is in the correct direction perhaps:
(PLUS: fixed back/forwards 'negative' error!)
(EDITED: WolRon pointed out something I completely missed hehe)
It may be just an optical illusion that appears to be moving sideways because of the movement of the camera and positioning of the texture 'tiles'
Try making the step sizes MUCH smaller, see if this looks like the movement is in the correct direction perhaps:
If KeyDown(203) TurnEntity camera,0,0.1,0 ;left If KeyDown(205) TurnEntity camera,0,0-(0.1),0 ;Right If KeyDown(200) Then MoveEntity camera,0,0,0.1 ;forward If KeyDown(208) Then MoveEntity camera,0,0,0-(0.1);back
(PLUS: fixed back/forwards 'negative' error!)
(EDITED: WolRon pointed out something I completely missed hehe)