updated

Assets/Scripts/Enemies/SwarmAnimator.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.VFX;
+
+[ExecuteAlways]
+public class SwarmAnimator : MonoBehaviour
+{
+    [SerializeField]
+    private VisualEffect vfx;
+
+    private Vector3 currentPosition;
+    private Vector3 previousPosition;
+    [SerializeField]
+    private Rigidbody rb;
+    [SerializeField]
+    private string parameterName = "DeltaVector";
+
+    [SerializeField]
+    private Vector3 avoidancePosDefault;
+
+    [SerializeField]
+    private float explodeDuration = 1.0f;
+    private float dur = 0f;
+    private bool isExploding = false;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        previousPosition = currentPosition;
+        currentPosition = transform.position;
+        Vector3 velocity = (currentPosition - previousPosition) ;
+        vfx.SetVector3("DeltaVector", velocity);
+
+        if (Input.GetKeyDown(KeyCode.Space))
+        {
+            Explode();
+        }
+        if (isExploding)
+        {
+            if(dur> explodeDuration)
+            {
+                StopExplode();
+            }
+            dur += Time.deltaTime;
+        }
+        
+    }
+
+    void Explode()
+    {
+        vfx.SetVector3("Avoid", transform.position);
+        this.isExploding = true;
+        dur = 0;
+
+        //Wait a sec then stop.
+    }
+    void StopExplode()
+    {
+        vfx.SetVector3("Avoid", avoidancePosDefault);
+        this.isExploding = false;
+        vfx.Stop();
+    }
+    private void FixedUpdate()
+    {
+        
+    }
+}

Assets/Scripts/Enemies/SwarmAnimator.cs.meta

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