VFX & Particle System

using UnityEngine;

public class HitEffect : MonoBehaviour
{
  public ParticleSystem sparks;
  public ParticleSystem smoke;

  // Call on bullet impact — PlayOneShot a prefab at a position
  public static void PlayAt(Vector3 pos, Vector3 normal,
                             GameObject fxPrefab)
  {
      GameObject fx = Instantiate(fxPrefab, pos,
          Quaternion.LookRotation(normal));
      Destroy(fx, 2f); // Clean up after 2 seconds
  }

  // Burst emit: 30 particles immediately, no looping
  public void BurstEmit()
  {
      ParticleSystem.EmitParams ep = new ParticleSystem.EmitParams();
      ep.position = transform.position;
      sparks.Emit(ep, 30);
      smoke.Play();
  }

  // Change particle color at runtime via Main module
  public void SetColor(Color color)
  {
      var main = sparks.main;
      main.startColor = new ParticleSystem.MinMaxGradient(color);
  }
}

using UnityEngine;
using UnityEngine.VFX;

public class VFXController : MonoBehaviour
{
  public VisualEffect vfx;

  // Property IDs — must match Exposed Property names in VFX Graph
  static readonly int SpawnRateID = Shader.PropertyToID("SpawnRate");
  static readonly int ColorID     = Shader.PropertyToID("BaseColor");
  static readonly int ExplodeID   = Shader.PropertyToID("OnExplode");

  void Start()
  {
      vfx.SetFloat(SpawnRateID, 50f);
      vfx.SetVector4(ColorID, new Vector4(1f, 0.5f, 0f, 1f));
  }

  public void Explode()
  {
      // SendEvent fires an event in VFX Graph (Burst spawn)
      vfx.SendEvent(ExplodeID);
  }

  public void SetIntensity(float t)
  {
      // Spawn rate 0 → 500 from intensity
      vfx.SetFloat(SpawnRateID, Mathf.Lerp(0f, 500f, t));
  }
}