Motion Blur artefacts in Viewport #127107

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Marc-Schwindt · 2024-09-03T15:37:48+02:00

Marc-Schwindt commented

2024-09-03 15:37:48 +02:00

System Information
Operating system: Windows 10
Graphics card: 3080 RTX

Blender Version
Broken: 4.3.0-alpha+main.e26e62597da5
Worked: (newest version of Blender that worked as expected)

Short description of error
The Motion Blur in the Viewport has some artefacts on fast stuff.
using Temporal Reprojection makes it even worse

I'm not shure if this is excpected, but since the render looks quite different...

(In the my References, the camera rotates with 22.5° per frame and no Temporal Reprojection)

Exact steps for others to reproduce the error
Set the Motion Blur to 1, so it's more visible
move anything fast

**System Information** Operating system: Windows 10 Graphics card: 3080 RTX **Blender Version** Broken: 4.3.0-alpha+main.e26e62597da5 Worked: (newest version of Blender that worked as expected) **Short description of error** The Motion Blur in the Viewport has some artefacts on fast stuff. using Temporal Reprojection makes it even worse I'm not shure if this is excpected, but since the render looks quite different... (In the my References, the camera rotates with 22.5° per frame and no Temporal Reprojection) **Exact steps for others to reproduce the error** Set the Motion Blur to 1, so it's more visible move anything fast

Eevee Next Render Motion Blur Test.jpg

417 KiB

Eevee Next Viewport Motion Blur Test.png

704 KiB

Eevee Next Viewport Motion Blur Test.png

Marc-Schwindt added the

labels 2024-09-03 15:37:48 +02:00

heini commented

2024-09-03 19:53:48 +02:00

I have similar issues. The motion blur works fine at first, then when I hide / unhide any object in the viewport there is heavy flickering in the viewport (Note: renders seem ok)

It only occurs with temporal reprojection turned on, disappears after reloading or switching to a different vp shading mode but occurs in both material preview and render mode.

(latest alpha, Win 10, GTX 1060 6MB)

I have similar issues. The motion blur works fine at first, then when I hide / unhide any object in the viewport there is heavy flickering in the viewport (Note: renders seem ok) It only occurs with temporal reprojection turned on, disappears after reloading or switching to a different vp shading mode but occurs in both material preview and render mode. (latest alpha, Win 10, GTX 1060 6MB)

2024-09-03 19-44-46.mp4

2.4 MiB

mobl_flicker.blend

1.6 MiB

YimingWu commented

2024-09-04 05:22:38 +02:00

I can confirm the flicker after hiding-showing an object in @heini 's file, so that's definitely a bug, but that's with temporal reprojection turned on, while @Marc-Schwindt doesn't have it on. So we have TWO bugs in this one 🤔

I have set up a file where the square rotates ridiculously fast, this is what it looks like without temporal reprojection. Looks like it might just be using speed vector and interpolate linearly so the blur actually extend beyond the rotation area and have some missing blocks visually. Not sure if this is a known limitation @fclem

I can confirm the flicker after hiding-showing an object in @heini 's file, so that's definitely a bug, but that's with temporal reprojection turned on, while @Marc-Schwindt doesn't have it on. So we have _TWO_ bugs in this one 🤔 I have set up a file where the square rotates ridiculously fast, this is what it looks like without temporal reprojection. Looks like it might just be using speed vector and interpolate linearly so the blur actually extend beyond the rotation area and have some missing blocks visually. Not sure if this is a known limitation @fclem <img width="344" alt="图片" src="attachments/13c678ff-91e5-42de-b837-08726e4f42ba">

图片.png

187 KiB

YimingWu added

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Motion Blur artefacts in Viewport #127107