Summary
There is issue with post process volume and post process scale ( like box ) when using it inside the blueprints.
“In UE 5.8, if a PostProcessComponent uses ‘Use Attach Parent Bound’ attached to a Box Collision component, the effect fails to render at runtime if the box is set to ‘No Collision’. It works fine in the editor viewport. The issue is resolved if the box collision is changed to ‘Query Only’, implying that runtime rendering bounds are incorrectly tied to the physics octree lifecycle rather than the component’s transform bounds matrix.”
What Type of Bug are you experiencing?
Other
Steps to Reproduce
Create a clean, blank Unreal Engine 5.8 project (Third Person Template is ideal).Create a new Actor Blueprint and open it.In the Components panel, add a Box Collision component and set it as the Root Component.Select the Box Collision component, scroll down to the Collision section in the Details panel, and change the Collision Presets to No Collision.Add a Post Process Component as a child of the Box Collision component.Select the Post Process Component and configure the following settings:Uncheck Infinite Extent (Unbound).Check Use Attach Parent Bound.Under Color Grading (or any highly visible section), drastically adjust a setting (e.g., set Global Contrast to 5.0 or change Global Tint to bright red) so the effect is unmistakably obvious when active.Compile and save the Blueprint.Drag the Blueprint into the level and use the Scale Tool (R) to enlarge it significantly so a player character can easily walk inside it.Move the Editor Camera into and out of the bounding box.Observed Editor Behavior: The post-process effect turns on and off correctly as the editor camera crosses the boundary.Press Play (PIE) and walk the player character/camera directly inside the scaled bounding box.
Expected Result
The post-process effect should render seamlessly during gameplay when the camera enters the box bounds, matching the exact behavior seen in the Editor Viewport.
Observed Result
The post-process effect completely fails to render at runtime. (Changing the parent Box Collision preset from No Collision to Query Only instantly restores proper functionality at runtime).
Affects Versions
5.8
Platform(s)
Windows
Video