AnnotationSphereScaler.cs

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;
using UI;

public class AnnotationSphereScaler : MonoBehaviour{

    public GameObject bobble;

    public float maxScale = 15f;
    public float minScale = 0.5f;

    private bool reScale = false;
    //private bool onMesh = false;
    private Vector3 rescaleDirection;

    public void rescaleAnnotation(BaseEventData eventData) {
        PointerEventData data = eventData as PointerEventData;
        if (data.button == PointerEventData.InputButton.Left) {
            rescaleDirection = bobble.transform.localPosition;
            reScale = true;
        }
    }

    public void stopRescale(BaseEventData eventData) {
        PointerEventData data = eventData as PointerEventData;
        if (data.button == PointerEventData.InputButton.Left) {
            reScale = false;
        }

    }

    private void rescaleMesh() {
        InputDevice inputDevice = InputDeviceManager.instance.currentInputDevice;
        Plane intersectPlane = new Plane ();
        float dist = 0f;
        Ray intersectRay = inputDevice.createRay ();
        //Move Ray to CameraCenter
        intersectRay.origin = inputDevice.getEventCamera ().transform.position;

        //update plane

        Vector3 globalDir = this.transform.parent.TransformDirection (rescaleDirection);
        Vector3 camAnnoVec = (intersectRay.origin - this.transform.parent.position);

        Vector3 planeVec = Vector3.Cross (globalDir, camAnnoVec);
        Vector3 normal = Vector3.Cross (globalDir, planeVec);
        normal.Normalize ();

        intersectPlane.SetNormalAndPosition (normal, this.transform.parent.position);

        if (intersectPlane.Raycast (intersectRay, out dist)) {
            Vector3 intersectPoint = intersectRay.GetPoint (dist);
            Vector3 intersectDirection = intersectPoint - this.transform.parent.position;
            if (intersectDirection.magnitude < maxScale && intersectDirection.magnitude > minScale) {
                bobble.transform.position = intersectPoint;
                //Add scale only in one Direction
                float newScale = bobble.transform.localPosition.magnitude * 2;
                this.GetComponentInParent<Annotation> ().rescaleMesh (new Vector3 (newScale, newScale, newScale));
            }




        }

    }

    public void Start() {
        Vector3 scale = this.GetComponentInParent<Annotation> ().getMeshScale ();
        bobble.transform.localPosition = new Vector3 (scale.x / 2f, 0f, 0f);
    }

    public void Update() {
        if(reScale) {
            rescaleMesh ();
        }
    }
}