vector to viewpoint with nested rotation

Question

I have a ship which has its own position and rotation and a parent transform object which also has its own position and rotation. This is essential for my game and works really well.

There is just one problem when I want to display the targeting reticle in front of the ship in third person view. This is the code:

 public class GUIController : MonoBehaviour
 {
     public Transform ReticleFront;

     const float frontReticleDistance = 50f;

     void FixedUpdate()
     {
         //front reticle: get reticle vector based on ship rotation
         Vector3 wantedPos = transform.TransformPoint(0, 0, frontReticleDistance);
         Debug.DrawLine(transform.position, wantedPos, Color.green);

         //front reticle: convert vector to viewpoint position as its a 2d texture
         ReticleFront.position = Camera.main.WorldToViewportPoint(wantedPos);
     }
 }

The Debug.DrawLine is drawn with the correct rotation/position but the viewport position of the reticle does somehow seem to ignore the rotation of the parent object.

I would be very thankful for any help. Greetings :)

Answer 1

Best Answer

Answer by sneftel · Jun 20, 2011 at 02:06 PM

If changing to LateUpdate fixes things, that's probably because you've got some other behavior also messing with the reticle's transform (LateUpdate is one of the last functions to run before rendering).

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stfx · Jun 20, 2011 at 02:16 PM 0

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Wow you sir are awesome. I accidently had the targeting reticle nested under the ships parent transform and therefore it was not working. So it now even works in Update() or FixedUpdate() though I am using LateUpdate() now due to your explanation. Thanks a bunch :)

vector to viewpoint with nested rotation

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