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UI Post-Processing in URP

Under Audit

post-processingrenderingcameragraphics

Unity 2021.3.x - Unity 6.x

Published 4 days ago

Post-processing effects, such as bloom, applied through a Volume in URP, affect the entire scene, including UI elements, even when using a stacked camera setup for UI.

Issue

 The issue describes difficulty applying post-processing effects, specifically bloom, exclusively to UI elements within the Universal Render Pipeline (URP). Even with a setup that includes a main Camera and a stacked UI Camera, where the UI Camera is configured to render only UI elements and the main Camera renders everything else, applying bloom through a Volume component results in the effect being applied across the entire game world. This happens despite the presence of both a default Volume and a dedicated UI Volume, indicating a challenge in isolating the bloom effect to only the UI layer.

Experimental Fixes
  • Ensure the Volume component’s Layer Mask property is configured to target only the UI layer and exclude other game elements.
  • Verify that the Universal Additional Camera Data component on your UI Camera has the Render Post Processing option enabled and that the Volume override masks are correctly set to prioritize the UI Volume.
  • Investigate the Volume profile assigned to the UI Volume to confirm that it contains only the desired bloom effect and no global effects that might unintentionally propagate.

Editor's Note:

The above fixes have not been verified by our audit team yet. They are provided exclusively for your own technical research. We recommend creating a backup of your project before proceeding with any attempts. Utilize at your own discretion!

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Content inspired by a Unity discussion post.