Fix UI Post-Processing in Unity! (Finally!) - Render Graph URP Camera Stacking Tutorial (2025)
Tired of post-processing effects messing up your whole Unity scene when you only want them on your UI? You're not alone! This tutorial FINALLY shows you how to isolate post-processing to UI elements using camera stacking, a custom render feature, and the new alpha preservation feature in Unity 6 & URP. No more global bloom on EVERYTHING! Seriously, this fix will help you create the Iron Man HUD or UI Canvas for your game with VFX that don’t affect everything in your scene.
We'll cover:
The limitations of camera stacking for post-processing in older Unity and URP versions
How to use the new alpha preservation feature and a Context Container with Render Graph
How to use a custom render feature to isolate the UI
Setting up camera stacking for UI post-processing
Modifying the shader to create a better visual effect
(Beginner-friendly) No advanced graphics knowledge needed!
Shoutout to Aljosha at Unity for the helpful scripts!
Video Chapters
Part 1
00:00 - Introduction: What we'll be covering today and visual examples
00:55 - The Problem: Why UI Post-Processing is tricky in previous Unity versions
02:36 - My struggle and the glimmer of hope
03:14 - How the render pipeline works in Unity; Camera Stacking and Render Features Explained (Render Graph Viewer)
04:38 - The Solution: Aljosha’s render feature explained (high level)
05:08 - Implementation of the render feature
Part 2
08:00 - For the more technically oriented…
08:15 - Understanding the different functions of the render feature
09:45 - Understanding the Push pass
11:30 - Understanding the Pop pass
12:56 - Visualizing render passes in the render graph viewer
13:34 - Implementing modified render feature
14:46 - Enhancing the Bloom effect so it looks better
16:31 - Removing post-processing from Scene View
16:44 - Using separate volumes for post-processing (main cam vs overlay cam)
17:49 - Ok. Boom. Done.
Download the project files:
Github (for the hackers): https://github.com/rmasiso/PostProces...
Kofi (it's free, obvi): https://ko-fi.com/s/ac8f674251
Check out the Unity forum thread with Aljosha’s original scripts: https://discussions.unity.com/t/post-...
Asset store visuals seen at beginning of video:
Insane Asylum: https://assetstore.unity.com/packages...
Idyllic Fantasy Nature: https://assetstore.unity.com/packages...
#unity #urp #postprocessing #ui #tutorial #gamedev #unity3d #gamedev #uidesign #ironmanhud #URPRenderGraph #RenderGraphViewer