Elp, Entity yaw.

hay all, I know this is gona be something really really daft, but its buggin me so i thought id ask.

If you need the media I will provide it as well just let me know.

ok, What im trying to do is have this target moved by the mouse, the ship will face the target at all times, I'm using the Delta Yaw method to do this(found on a forum search) ..

The Problem is that as I move the target from left to right, as I pass over the ship and go into its right hand side the ship flips over.

Any Ideas ?

;
;
;	Asteroids Remake.
;
;	This mini project has been started as a test bed for some of the things
;	I plan to implement into the SolarShatter code base.
;
;

Graphics3D 800,600,32,2
SetBuffer BackBuffer()
Cls

HidePointer()



Global cam=CreateCamera()
PositionEntity cam,0,0,-20
Global light=CreateLight()


Global background=CreatePlane()
Global texture_background=LoadTexture("img/bg1.jpg")

RotateEntity background,-90,0,0
ScaleTexture texture_background,40,30
PositionTexture texture_background,.50,.50

EntityTexture background,texture_background


Global line_vert=LoadImage("img/vert.jpg")
Global line_hor=LoadImage("img/hor.jpg")
Global Target=LoadImage("img/target.bmp"):MidHandle target:MaskImage target,255,0,255


Global mouse_pivot=CreateSphere(3)




Global PLayer_Ship=LoadMesh("models/ship.3ds")
ScaleEntity player_ship,.02,.02,.02
HideEntity PLayer_Ship


Type player

	Field x#
	Field y#
	Field z#
	
	Field turn_rate#
	Field turn_amount#
	
	Field sight_pivot
	Field model

End Type


Global player.player = New player
	player\x=0
	player\y=0
	player\turn_rate=1.5
	
	player\model=CopyEntity(player_ship)
	PositionEntity player\model,0,0,-2			
	HideEntity background

	
	t=CreateSphere(3)
	PositionEntity t,0,20,-2
	
	player\sight_pivot=CreatePivot()
	PositionEntity player\sight_pivot,0,0,-2
	
	EntityParent player\model,player\sight_pivot
	
	RotateEntity player\model,0,0,90
	


;Play out the game intro

Intro()

Function Intro()

	GUI()
	
End Function

End













Function GUI()
	Local ENDGUI=False
	
	Repeat
		Cls
		
			GUI_Update()
			GUI_Render()
			
			UpdateWorld()
			RenderWorld()
			
			GUI_Render_2D()
			
			If KeyHit(57)=1 Then Game()
			
		Flip False
	Until KeyHit(1) Or ENDGUI=True
	
End Function


Function GUI_Update()
	
	
End Function


Function GUI_Render()
	
	

End Function

Function GUI_render_2D()

End Function













Function GAME()
	Local ENDGAME=False
	
	Repeat
		Cls
		
			GAME_Update()
			GAME_Render()
			
			UpdateWorld()
			RenderWorld()
			
			GAME_render_2d()
		Flip 
	Until KeyHit(1) Or ENDGAME=True
		
End Function

Function GAME_update()
		
	PositionEntity mouse_pivot,-19.1+(MouseX()/20.99),-(-14.2+(MouseY()/20.99)),-2
	PointEntity player\sight_pivot,mouse_pivot
	game_align(player\model,mouse_pivot,1)

End Function

Global switch=False

Function game_align( Entity, Target, Smooth# )

	dp# = GAME_LIMIT ( DeltaPitch( Entity , Target ) , -Smooth , Smooth )
	dy# = GAME_LIMIT ( DeltaYaw( Entity , Target ), -Smooth , Smooth )
	TurnEntity Entity, 0 , dy , 0
		 
End Function


Function GAME_LIMIT#( q# , low# , hi# )

	If q < low q = low
	If q > hi q = hi

	Return q
	
End Function

Function GAME_render()
	PositionEntity player\model,player\x,player\y,-2,1
End Function




Function GAME_render_2D()
	DrawImage line_hor,0,MouseY(),0
	DrawImage line_vert,MouseX(),0,0
	DrawImage target,MouseX(),1+MouseY(),0
	
	
	Text 1,1,"Yaw :"+EntityYaw(player\model,1)
	Text 1,20,"pit :"+EntityPitch(player\model,1)
	Text 1,30,"rol :"+EntityRoll(player\model,1)
End Function