[UGUI] Fix Ghost Input Blocks in UI Grid Layout Groups
Solution
Unity 2021.3.x - Unity 6.3.x
Published 25 days ago
An unidentified box within your GridLayoutGroup overlaps UI elements, blocking the Graphic Raycaster. This artifact is visually imperceptible but prevents input detection on adjacent slots. The issue typically persists until the Canvas is refreshed or the object is re-selected in the Editor.
A visually imperceptible box often stems from a CanvasRenderer error or a stale RectTransform. The primary cause is typically a parent object with an active Raycast Target property capturing input meant for children.
- Open your prefab and inspect the root object for an
ImageorRawImagecomponent. - Locate the Raycast Target boolean and ensure it is disabled on any container that does not require direct interaction.
- Delete the
CanvasRendererfrom your prefab and allow Unity to regenerate it to clear potential data corruption. - If the issue remains, instantiate a fresh
GameObject, copy the necessary components, and replace the old asset.
Additional Tips
- Use the Frame Debugger to identify which
Graphicis consuming the event. - Check for
TextMeshProcomponents with Raycast Target enabled on empty string fields. - Ensure the
RectTransformof your prefab does not have a negative scale, which can invert raycast logic in some Unity versions.
TL;DR
Ghost UI boundaries blocking input are fixed by auditing Raycast Target settings on parent containers or regenerating corrupted Prefab metadata.
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Content inspired by a Unity discussion post.