How to add inertia damping?

Question

I have the bellow code witch open-closes a drawer by mouse dragging. How do i add inertia?

Here is the code.

 using UnityEngine;
 using System.Collections;
 
 public class draw : MonoBehaviour {
 
     float translate_z;
     float current_z;
     float sensX = 4.0f;
 
     public bool isDraging;
     public GameObject drawer;
 
     void Update () {
         if (Input.GetMouseButton (0)) {
             if (!isDraging) {
                 RaycastHit hit;
                 Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition); 
                 if (Physics.Raycast (ray, out hit, 5.0f)) {
                     drawer = hit.collider.gameObject;
                     current_z = hit.collider.transform.position.z;
                     translate_z = current_z;
                     Debug.Log (current_z);
                     isDraging = true;
                 }
             }
 
             if (isDraging) {
                 translate_z += Input.GetAxis ("Mouse Y") * sensX * Time.deltaTime;
                 translate_z = Mathf.Clamp (translate_z, -1.25f, 0.0f);
                 drawer.transform.localPosition = new Vector3 (0.0f, 0.0f, translate_z);
             }
         } else if (Input.GetMouseButtonUp(0)) {
             isDraging = false;
         }
     }
 }

Answer 1

This should work, it adds a speed modifier that is increased every frame that the drawer is dragged, and is decreased every frame that it isn't.

 using UnityEngine;
 using System.Collections;
  
 public class draw : MonoBehaviour {
  
 float translate_z;
 float current_z;
 float sensX = 4.0f;
 float currentDragSpeed = 0; // The speed the drawer is being dragged
 float maxDragSpeed = 1f; // Change this to the fastest speed you want to be able to drag the drawer at
 float accelerationRate = 0.01f;    // Changing this value will affect how quickly the drawer accelerates
 
 public bool isDraging;
 public GameObject drawer;
 
 void Update () {
     if (Input.GetMouseButton (0)) {
         if (!isDraging) {
             RaycastHit hit;
             Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition); 
             if (Physics.Raycast (ray, out hit, 5.0f)) {
                 drawer = hit.collider.gameObject;
                 current_z = hit.collider.transform.position.z;
                 translate_z = current_z;
                 Debug.Log (current_z);
                 isDraging = true;
             }
         }
 
         if (isDraging) 
         {
             if(currentDragSpeed < maxDragSpeed)    //    While the drawer can accelerate further
             {                 
                 currentDragSpeed += accelerationRate;    //    Accelerate
             }
         }
         else
         {
             if(currentDragSpeed > 0)    //    While the drawer is still moving
             {
                 currentDragSpeed -= accelerationRate;    //    Decelerate
         }
     }
 
     translate_z = Input.GetAxis ("Mouse Y") * sensX* currentDragSpeed * Time.deltaTime;
     translate_z = Mathf.Clamp (translate_z, -1.25f, 0.0f);
     drawer.transform.localPosition += new Vector3 (0.0f, 0.0f, translate_z);
 
     } else if (Input.GetMouseButtonUp(0)) {
              isDraging = false;
         }
     }
 }

How to add inertia damping?

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