ModelZoomer.cs

// Model Zoomer 
//

using System;
using UnityEngine;

public class ModelZoomer : MonoBehaviour
{


    public float zoomingSpeed = 1;
    public float maxZoom = 2f;
    public float minZoom = 0.2f;

    private Vector3 targetZoom;
    private Vector3 zoomVelocity;

    public float autoZoomSpeed = 0.5f;
    private float scaleTime = 0.3f;

    private bool zooming = false;
    private float originalDist = 0;
    private Vector3 mOriginalZoom;

    private void Start()
    {
        targetZoom = transform.localScale;
    }


    private void Update()
    {
        if (UI.Core.instance.layoutSystem.activeScreen == UI.Screen.center) {

            InputDevice inputDevice = InputDeviceManager.instance.currentInputDevice;
            if (inputDevice.getDeviceType () == InputDeviceManager.InputDeviceType.Mouse) {
                // Let mouse handle zooming:
                if (!UI.Core.instance.pointerIsOverPlatformUIObject) {
                    if (Input.GetAxis ("Mouse ScrollWheel") != 0) {
                            
                        float inputScroll = Input.GetAxis ("Mouse ScrollWheel");

                        float zoom = transform.localScale.x + inputScroll / (1 / zoomingSpeed);

                        zoom = Mathf.Clamp (zoom, minZoom, maxZoom);

                        transform.localScale = new Vector3 (zoom, zoom, zoom);
                        targetZoom = transform.localScale;
                    }
                }
            } else if (inputDevice.getDeviceType () == InputDeviceManager.InputDeviceType.ViveController) {

                    // Let left Vive controller handle zooming:
                    LeftController lc = InputDeviceManager.instance.leftController;
                    if (lc != null) {
                        UnityEngine.EventSystems.PointerEventData.FramePressState triggerState = lc.triggerButtonState;
                        if (triggerState == UnityEngine.EventSystems.PointerEventData.FramePressState.Pressed && zooming == false) {
                            zooming = true;
                            originalDist = (lc.transform.position - transform.position).magnitude;
                            mOriginalZoom = transform.localScale;
                        } else if (triggerState == UnityEngine.EventSystems.PointerEventData.FramePressState.Released && zooming == true) {
                            zooming = false;
                        }

                        if (zooming) {

                            float dist = (lc.transform.position - transform.position).magnitude;

                            float distDiff = dist - originalDist;

                            Vector3 newScale = mOriginalZoom + mOriginalZoom * distDiff;

                            setTargetZoom (newScale);
                        }
                    }

                }
        }

        // Auto-Zoom to target, if given:
        transform.localScale = Vector3.SmoothDamp(transform.localScale, targetZoom, ref zoomVelocity, scaleTime);
    }

    public void setTargetZoom( Vector3 zoom, float timeForScaling = 0f )
    {
        targetZoom = zoom;
        zoomVelocity = new Vector3 (0, 0, 0);
        if (timeForScaling == 0) {
            scaleTime = 1f;
            transform.localScale = targetZoom;
        } else {
            scaleTime = timeForScaling;
        }
    }
}