[Unity] Override Camera Ambient Color for SRP

CameraAmbientOverride.cs

using UnityEngine;
using UnityEngine.Rendering;

namespace CameraAmbientOverride
{
    /// <summary>
    /// Attach it to camera. Supports both URP and HDRP. 
    /// </summary>
    [DisallowMultipleComponent]
    [RequireComponent(typeof(Camera))]
    public class CameraAmbientOverrideSrp : MonoBehaviour
    {
        [SerializeField] private bool _useCustomAmbientColor;
        [SerializeField] private Color _customAmbientColor;
        private Camera _cam;
        private Color _defaultAmbientColor;
        private bool _isSubscribed;

        private void Awake()
        {
            _defaultAmbientColor = RenderSettings.ambientLight;
            _cam = GetComponent<Camera>();
        }

        private void OnEnable()
        {
            SubscribeToEvents();
        }

        private void OnDisable()
        {
            UnsubscribeFromEvents();
        }

        private void SubscribeToEvents()
        {
            if (_isSubscribed) return;

            RenderPipelineManager.beginCameraRendering += OnBeginCameraRendering;
            RenderPipelineManager.endCameraRendering += OnEndCameraRendering;
            _isSubscribed = true;
        }

        private void UnsubscribeFromEvents()
        {
            if (!_isSubscribed) return;

            RenderPipelineManager.beginCameraRendering -= OnBeginCameraRendering;
            RenderPipelineManager.endCameraRendering -= OnEndCameraRendering;
            _isSubscribed = false;
        }

        private void OnBeginCameraRendering(ScriptableRenderContext ctx, Camera cam)
        {
            if (cam != _cam) return;

            if (_useCustomAmbientColor) RenderSettings.ambientLight = _customAmbientColor;
        }

        private void OnEndCameraRendering(ScriptableRenderContext ctx, Camera cam)
        {
            if (cam != _cam) return;

            if (_useCustomAmbientColor) RenderSettings.ambientLight = _defaultAmbientColor;
        }
    }
}

Usage scenario

• To have different environment lighting for certain objects
• To set ambient light per camera

using UnityEngine;

namespace CameraAmbientOverride
{
    /// <summary>
    /// Works for built-in render pipeline.
    /// </summary>
    [DisallowMultipleComponent]
    [RequireComponent(typeof(Camera))]
    public class CameraAmbientOverrideBIT : MonoBehaviour
    {
        [SerializeField] private bool _useCustomAmbientColor;
        [SerializeField] private Color _customAmbientColor;

        private Color _defaultAmbientColor;

        private void Awake()
        {
            _defaultAmbientColor = RenderSettings.ambientLight;
        }

        private void OnPostRender()
        {
            if (_useCustomAmbientColor) RenderSettings.ambientLight = _defaultAmbientColor;
        }

        private void OnPreCull()
        {
            if (_useCustomAmbientColor) RenderSettings.ambientLight = _customAmbientColor;
        }
    }
}

Here's the built-in pipeline version, posted by peachpieproductions.

I got inspiration from it and write the SRP version (as SRP don't use OnPostRender but use endCameraRendering) (Source)

Demo

Desktop.2025.01.23.-.23.58.03.19.mp4