Add DamagePostProcess component for enhanced visual feedback on damage; implement vignette effect and adjust flash color settings

Assets/Scripts/Systems/DamagePostProcess.cs

@@ -0,0 +1,66 @@
+using System.Collections;
+using KBCore.Refs;
+using UnityEngine;
+using UnityEngine.Rendering;
+using UnityEngine.Rendering.Universal;
+
+namespace Systems
+{
+    public class DamagePostProcess : MonoBehaviour
+    {
+        private float ogVignetteIntensity;
+        private Coroutine runningEffect;
+        
+        [SerializeField, Scene] private Volume globalVolume;
+        [SerializeField, Self] private Health health;
+        [SerializeField] private float postProcessDuration = 0.5f;
+        
+        [SerializeField] private float vignetteHitIntensity = 0.5f;
+        
+        private void OnEnable()
+        {
+            health.OnTakeDamage += OnHit;
+        }
+
+        private void OnDisable()
+        {
+            health.OnTakeDamage -= OnHit;
+        }
+
+        private void OnHit()
+        {
+            if (runningEffect != null) StopCoroutine(runningEffect);
+            
+            runningEffect = StartCoroutine(ApplyPostProcessEffect());
+        }
+
+        private IEnumerator ApplyPostProcessEffect()
+        {
+            if (!globalVolume) yield break;
+
+            if (!globalVolume.profile.TryGet<Vignette>(out var vignette))
+                yield break;
+
+            ogVignetteIntensity = vignette.intensity.value;
+            globalVolume.profile.TryGet<ChromaticAberration>(out var chromaticAberration);
+            
+            vignette.intensity.value = vignetteHitIntensity;
+            if (chromaticAberration) chromaticAberration.active = true;
+            
+            yield return new WaitForSeconds(postProcessDuration);
+            
+            float fade = 0f, fadeDuration = 0.25f;
+            while (fade < fadeDuration)
+            {
+                fade += Time.deltaTime;
+                vignette.intensity.value = Mathf.Lerp(vignetteHitIntensity, ogVignetteIntensity, fade / fadeDuration);
+                yield return null;
+            }
+            
+            vignette.intensity.value = ogVignetteIntensity;
+            if (chromaticAberration) chromaticAberration.active = false;
+
+            runningEffect = null;
+        }
+    }
+}