station_obscurum_unity/Assets/Scripts/Enemies/SwarmAnimator.cs

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()
    {
        
    }
}