Question Dotween squish and stretch 3d cube

Hi,

I've spent way too long trying to get a cube to do a simple squish and stretch when it impacts with ground. Could someone please give me an example?

Code (CSharp):

1. Sequence sequence = DOTween.Sequence();
2. sequence.Append(transform.DOMoveY(0, .5f)).SetEase(Ease.InExpo);
3. // Append squish and stretch

 

I don't know about dotween but if you create a new scene and drop the script below onto a cube then it will give you some jello for later.

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Jello : MonoBehaviour
4. {
5.     Rigidbody rb;
6.  
7.     Vector3 scaleVelocity;
8.     Vector3 scaleTarget;
9.     void Start()
10.     {
11.         rb=gameObject.AddComponent<Rigidbody>();
12.         PhysicMaterial material = new PhysicMaterial();
13.         material.bounciness=1;
14.         GetComponent<Collider>().material = material;
15.         GameObject obj=GameObject.CreatePrimitive(PrimitiveType.Cube); // create a floor
16.         obj.transform.localScale=new Vector3(10,0.2f,10);
17.         obj.GetComponent<Renderer>().material.color=Color.white;
18.         transform.position=Vector3.up*4f;
19.         GetComponent<Renderer>().material.color=Color.red; // has to be red. it's the law..
20.         scaleTarget=Vector3.one;
21.     }
22.  
23.     void Update()
24.     {
25.         transform.localScale+=scaleVelocity;
26.         scaleVelocity+=(scaleTarget-transform.localScale)*Time.deltaTime;
27.         scaleVelocity*=0.9f;
28.     }
29.  
30.     void OnCollisionEnter(Collision collision)
31.     {
32.         float h=Mathf.Abs(rb.velocity.y*0.03f);
33.         scaleVelocity=new Vector3(h,-Mathf.Abs(rb.velocity.y)*0.03f,h);
34.     }
35. }
36.  

 

Squash and stretch is just adjusting the scale. Just look at Dotween documentation about changing the scale.

 

Yes but its also about the right easing curves, didnt manage to make it feel good yet.

 

Done, feels quite good now:

Code (CSharp):

1. Sequence sequence = DOTween.Sequence();
2.  
3. sequence.Append(transform.DOMoveY(0, .5f)).SetEase(Ease.InExpo);
4.  
5. sequence.Append(transform.DOScaleY(.6f, .2f));
6. sequence.Insert(.5f, transform.DOScaleX(1.2f, .2f));
7. sequence.Insert(.5f, transform.DOScaleZ(1.2f, .2f));
8.  
9. sequence.Append(transform.DOScale(1f, .2f));

 

another thing you might find helpful are Unity animation curves. Then you can adjust the ease function however you want.
https://docs.unity3d.com/Manual/animeditor-AnimationCurves.html

I don't remember if Dotween supports these off the top of my head, though.