3 axis object movement

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b32

I now understand that you don't want to turn the mesh, but you want to move it. I haven't tested this function, but it is what I would try the first:

;to ensure that is an axis is selected, it stays selected while the mouse is down
Global Picked

;check mouse mode
If Not (method$ = "Mouse - Free") Then Return

;test if mouse is down
If Not (MouseDown(1)) Then Return

;move mouse
mouse_Y# = mouse_Y# + MouseYSpeed()

;only perform axis test on mousehit
If MouseHit(1) Then

	;perform mousepick
	picked = CameraPick(cam, MouseX(), MouseY())
	
End If

;test if an axis is picked
test = (picked = x_axis) Or (picked = y_axis) Or (picked = z_axis)
If Not test Then Return

;transform mouse on the Z axis of the picked arrow
;assumed is the orig. arrow model points to the front
TFormPoint 0, 0, mouse_Y, 0, picked

;move selected objects
;For e.Entity = Each Entity
	If (e\sel) Then
		TranslateEntity e\mesh, TFormedX(), TFormedY(), TFormedZ()
		;MoveEntity e\mesh, tformedX(), tformedY(), tformedZ(), 1
	End If
;Next

If it doesn't work, try first to make the object move along with the MouseY() coordinate. If you move the mouse up/down, the object should move forward/backward.
Then you can use TFormPoint to change this angle for the other arrows. Later on, you could fit in MouseX() if needed.