Weird motionblur on curves in Eevee #97380

New Issue

amit neole · 2022-04-16T12:41:35+02:00

amit neole commented

2022-04-16 12:41:35 +02:00

System Information
Operating system: Windows 10
Graphics card: RTX 2060

Blender Version
Blender version 3.1.2

Caused by 4e78a7360e
Prior to a6b7f32112 this just looked differently (cant tell what is right or wrong here)

Short description of error
When i render in 3.1.2, there is ugly rash on the left of the screen, which i have seen in alpha 3.2.0 alpha. Where as the render is excellent in 3.0.1

Exact steps for others to reproduce the error
Please render in evee in 3.0.1 - it will render the file correctly, where no rash is on render on bottom left of the screen. In 3.1.2 and 3.2.0 alpha renders are incorrect. Attaching the blend file.
Second Slide.blend

**System Information** Operating system: Windows 10 Graphics card: RTX 2060 **Blender Version** Blender version 3.1.2 Caused by 4e78a7360e Prior to a6b7f32112 this just looked differently (cant tell what is right or wrong here) **Short description of error** When i render in 3.1.2, there is ugly rash on the left of the screen, which i have seen in alpha 3.2.0 alpha. Where as the render is excellent in 3.0.1 **Exact steps for others to reproduce the error** Please render in evee in 3.0.1 - it will render the file correctly, where no rash is on render on bottom left of the screen. In 3.1.2 and 3.2.0 alpha renders are incorrect. Attaching the blend file. [Second Slide.blend](https://archive.blender.org/developer/F13003976/Second_Slide.blend)

amit neole commented

2022-04-16 12:41:35 +02:00

Added subscriber: @Neoamit

amit neole commented

2022-04-16 12:49:01 +02:00

Please render in evee in 3.0.1 - it will render the file correctly, where no rash is on render on bottom left of the screen. In 3.1.2 and 3.2.0 alpha renders are incorrect. Attaching the blend file{F13003976}

Please render in evee in 3.0.1 - it will render the file correctly, where no rash is on render on bottom left of the screen. In 3.1.2 and 3.2.0 alpha renders are incorrect. Attaching the blend file{[F13003976](https://archive.blender.org/developer/F13003976/Second_Slide.blend)}

Philipp Oeser commented

2022-04-19 11:33:07 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-04-19 11:33:07 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Philipp Oeser commented

2022-04-19 11:33:07 +02:00

Just to make sure we are actually talking about the same thing:

please show this in pictures (screenshots)
I assume you mean the difference caused by Motion Blur?
(reg. Motion Blur, I am a bit surprised myself this changed from 3.0.1 to 3.1.2...)

Just to make sure we are actually talking about the same thing: - please show this in pictures (screenshots) - I assume you mean the difference caused by Motion Blur? - (reg. Motion Blur, I am a bit surprised myself this changed from 3.0.1 to 3.1.2...)

Philipp Oeser commented

2022-04-19 12:46:24 +02:00

Changed status from 'Needs User Info' to: 'Confirmed'

Philipp Oeser commented

2022-04-19 12:46:24 +02:00

Added subscribers: @fclem, @JacquesLucke

Philipp Oeser commented

2022-04-19 12:46:24 +02:00

Traced this a bit and there is indeed something wrong with motionblur on hair curves in Eevee I think.

Caused by 4e78a7360e
Prior to a6b7f32112 this just looked differently (cant tell what is right or wrong here)

@JacquesLucke : mind checking?
CC @fclem

Traced this a bit and there is indeed something wrong with motionblur on hair curves in Eevee I think. Caused by 4e78a7360e Prior to a6b7f32112 this just looked differently (cant tell what is right or wrong here) @JacquesLucke : mind checking? CC @fclem

Philipp Oeser changed title from ~~wrong render compared to 3.0.1 realease~~ to Weird motionblur on curves in Eevee

2022-04-19 12:47:01 +02:00

Jacques Lucke commented

2022-04-19 15:15:23 +02:00

cant tell what is right or wrong here

I have the same problem here...

@Neoamit Can you simplify the file a bit (so that it contains fewer hair strands/objects) to make it more obvious what could be wrong?

> cant tell what is right or wrong here I have the same problem here... @Neoamit Can you simplify the file a bit (so that it contains fewer hair strands/objects) to make it more obvious what could be wrong?

Philipp Oeser commented

2022-04-19 15:29:55 +02:00

One thing the seems wrong (I think) is this orange bit:

But also just rendering that file in 2.93 (prior to all culprit commits) just renders MB differently.

One thing the seems wrong (I think) is this orange bit: ![image.png](https://archive.blender.org/developer/F13010508/image.png) But also just rendering that file in 2.93 (prior to all culprit commits) just renders MB differently.

blender-admin commented

2022-05-11 01:22:28 +02:00

This issue was referenced by f5077e057b

This issue was referenced by f5077e057b01e3c19dd9ba00e3acee8138569ac9

Clément Foucault commented

2022-05-12 12:46:27 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Clément Foucault closed this issue

2022-05-12 12:46:27 +02:00

Clément Foucault self-assigned this 2022-05-12 12:46:27 +02:00

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Weird motionblur on curves in Eevee #97380