iTween : moving along path, within a rotating reference frame

Hi, trying to do something quite tricky.

I want to move a missile along a predefined path with iTween. Nothing tricky here, except that I want this to happen inside a rotating environment. For some reason, all of my game objects stand in an empty game object which constantly spins, as if the world space itself was in motion.

I found a way to handle this (for those interested, more details at the end of this message), but there is one last problem I could’nt solve : the orientation of the missile. I want it to orient along its path, so I use the orienttopath parameter. This works perfectly in a static world, but not in a rotating one. I need my orientation to be « local », that is to say relative to the path space, not to the world space. Any way to do this ?

Thanx in advance and congratulations to the iTween’s author. I keep beeing amazed by the way this nice asset empowers Unity and celebrates the beauty of mathematics !

To translate along path within a moving reference frame :

• Make an empty GO with a script that moves or rotates it. This will stand for your « moving world », and all of your GO’s should be childed to it.
  
  

• For each point on the path, instantiate navpoints. These are simple Transforms that you will also child to the « rotating world », so that their positions keep being updated. It is important to make a navpoint for the start of the path and one for its end, not only for the intermediate points.
  
  

• Store their localPositions in an array of Vector3. This will be your path.
  
  

• Use iTween.MoveTo() as described in the example below. The « orienttopath » param should be set to false, until someone solves this specific problem
  
  Some code example :
  
  

Vector3[] path = new Vector3[] { startPoint.localPosition, navPoint1.localPosition, navPoint2.localPosition, endPoint.localPosition, }; iTween.MoveTo(myGameObject, iTween.Hash( "path", path, "time", 3f, "orienttopath", false, "islocal", true, "movetopath", false));