Off screen targert pointer

Hmm, well the closest I have so far is using a combination of EntityInView and DeltaPitch/DeltaYaw as originally suggested (similiar to how I was first trying to get this to work too).

Example:

Const WIDTH=640,HEIGHT=480
Graphics3D WIDTH,HEIGHT,16,2
SetBuffer BackBuffer()

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

light=CreateLight()
RotateEntity light,90,0,0

plane=CreatePlane()

cube=CreateCube()
PositionEntity cube,0,1,0

HidePointer

While Not KeyDown( 1 )
	;Mouse look
	TurnEntity Camera,Float#(MouseYSpeed())/3,-Float#(MouseXSpeed())/3,0
	RotateEntity Camera,EntityPitch#(Camera),EntityYaw#(Camera),0
	
	RenderNeeded=1
	
	MoveMouse WIDTH/2,HEIGHT/2
	
	
	RenderWorld
	
	Color 255,0,0
	a=EntityInView(cube,camera)
	Text 0,5,"EntityInView: "+a
	
	If Not a
		dx#=DeltaPitch#(camera,cube)
		dy#=DeltaYaw#(camera,cube)
		
		If Abs(dx#)>Abs(dy#)
			f#=dy#/90
			If dx#>0
				y=HEIGHT
			Else
				y=0
			EndIf
			x=WIDTH/2-WIDTH*f#
			f#=Abs(dx#/180)
		Else
			f#=0-(dx#/90)
			If dy#>0
				x=0
			Else
				x=WIDTH
			EndIf
			y=HEIGHT/2-HEIGHT*f#
			f#=Abs(dy#/180)
		EndIf
		size=5+f#*15.0
		If x<0 Then x=0
		If x>WIDTH Then x=WIDTH
		If y<0 Then y=0
		If y>HEIGHT Then y=HEIGHT
		
		Color 0,255,0
		Rect x-size/2,y-size/2,size,size,1
		
		
		Color 255,0,0
		Text 0,25,"Delta values: "+dx#+" , "+dy#
		Text 0,45,"Draw coords: "+x+" , "+y+" ("+size+")"
	EndIf
	
	Flip
Wend

End

Its not perfect yet and doesn't work if the camera rolls (which will be a problem as mine does up to about 70 degrees)