EEVEE next halo on motion blurred out of focus objects #126415

New Issue

HF · 2024-08-16T20:10:07+02:00

HF commented

2024-08-16 20:10:07 +02:00

System Information
Operating system: Windows-10-10.0.22631-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 555.85

Blender Version
Broken: version: 4.2.0, branch: blender-v4.2-release, commit date: 2024-07-16 06:20, hash: a51f293548ad
Worked: 4.1

Short description of error
dark halo on fast moving object with motion blur and DOF

Exact steps for others to reproduce the error
With EEVEE:

Animate a fast moving object on a constrasty background (E.g. A dark object on a brighter background)
Set up the camera with DOF configured to make that fast moving object out of focus.
Enable motion blur in the EEVEE render settings.
Render the scene and notice the halo around the object.

Here is a file with steps 1-3 done for you: https://projects.blender.org/attachments/8bcfe097-f498-4983-9143-ba5e52959e7e

**System Information** Operating system: Windows-10-10.0.22631-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 555.85 **Blender Version** Broken: version: 4.2.0, branch: blender-v4.2-release, commit date: 2024-07-16 06:20, hash: `a51f293548ad` Worked: 4.1 **Short description of error** dark halo on fast moving object with motion blur and DOF **Exact steps for others to reproduce the error** With EEVEE: 1. Animate a fast moving object on a constrasty background (E.g. A dark object on a brighter background) 2. Set up the camera with DOF configured to make that fast moving object out of focus. 3. Enable motion blur in the EEVEE render settings. 4. Render the scene and notice the halo around the object. Here is a file with steps 1-3 done for you: https://projects.blender.org/attachments/8bcfe097-f498-4983-9143-ba5e52959e7e

blender_yF0QVKY7x0.png

215 KiB

HF added the

labels 2024-08-16 20:10:08 +02:00

Alaska commented

2024-08-17 05:39:33 +02:00

I am personally unable to reproduce this issue. Can you share a file that has this issue with us? Or more detailed steps on how to recreate this issue?

Alaska added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2024-08-17 05:39:42 +02:00

Andrea-Lanaro commented

2024-08-17 06:12:43 +02:00

It only visible when DoF is also enabled. From my experiment, increasing motion blur steps reduce this artifact. Engine's limitation?

motion_blur_dof.blend

629 KiB

Alaska commented

2024-08-17 06:27:47 +02:00

Thanks for the file and extra details. I can confirm the issue with the attached file, but this is might be expected/a limitation. Although the issue isn't present in 4.1. So I will confirm the issue and mark as high severtiy as it's a regression, but leave it to the developers to properly decide on it.

I say this might be expected because DOF and motion blur are post processing techniques and they seem to interect with each other in a way that creates a dark halo in this situation.

You can reduce the visibility of this issue by using higher quality settings. These are:

Jittered DOF instead of post process DOF
- This can be enabled in Render Properties -> Depth of field -> Jitter Camera
And increase the motion blur steps.

For the scene provided the issue can be mostly elimitated with Jittered camera DOF and 2+ motion blur steps.

Thanks for the file and extra details. I can confirm the issue with the attached file, but this is might be expected/a limitation. Although the issue isn't present in 4.1. So I will confirm the issue and mark as high severtiy as it's a regression, but leave it to the developers to properly decide on it. I say this might be expected because DOF and motion blur are post processing techniques and they seem to interect with each other in a way that creates a dark halo in this situation. You can reduce the visibility of this issue by using higher quality settings. These are: - Jittered DOF instead of post process DOF - This can be enabled in `Render Properties -> Depth of field -> Jitter Camera` - And increase the motion blur steps. For the scene provided the issue can be mostly elimitated with Jittered camera DOF and 2+ motion blur steps.

👍 1

Alaska added

Module

Viewport & EEVEE