Unity Issue Tracker - Grabpass does not work when the Render Target is set to Camera and specific Viewport values are set (0,0.5,0.5,0.5)

In Progress

Fixed in 6000.0.64f1, 6000.2.15f1, 6000.3.1f1, 6000.4.0a6, 6000.5.0a1

Fix In Review for 2022.3.70f1

Votes

1

Found in

2021.3.54f1

2022.3.64f1

6000.0.54f1

6000.1.13f1

6000.2.0b12

6000.3.0a3

6000.5.0a1

Issue ID

UUM-113033

Regression

No

Grabpass does not work when the Render Target is set to Camera and specific Viewport values are set (0,0.5,0.5,0.5)

-

Jul 29, 2025

Reproduction steps:
1. Open the attached “IN-110055.zip” project
2. Open the “SampleScene”
3. Enter Play mode
4. Observe the Game view

Expected result: The Render Target is correctly displayed on the RawImage
Actual result: The Render Target is not visible/displayed on the RawImage

Reproducible with: 2021.3.54f1, 2022.3.64f1, 6000.0.54f1, 6000.1.13f1, 6000.2.0b12, 6000.3.0a3

Reproducible on: Windows 11, Windows 10
Not reproducible on: No other environment tested

Notes:
- It appears that the wrong “Y” value is used when calling CopySubresourceRegion()
- Does not reproduce with OpenGL Graphics API
- The issue can be bypassed on DirectX by setting the Viewport value to (0,0.25,0.5,0.5) instead
- Also reproducible in the Player

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