Motion Blur is rendered on dead particles #91389

New Issue

Alex · 2021-09-14T01:08:57+02:00

Alex commented

2021-09-14 01:08:57 +02:00

System Information
Operating system: macOS-11.5.2-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 5600M OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.6.20
(Tested also on a Windows 10 PC + Nvidia GTX 1080)

Blender Version
Broken: version: 2.93LTS, 3.5

Short description of error
Motion blur is rendered on dead particles that are still visible, such as particles that die on collision. Same for Eevee and Cycles renders, baked and not baked particles.

Exact steps for others to reproduce the error

Enable default motion blur in either Eevee or Cycles.
Use a plane to create a Particle System with Render > Extra > Dead and Physics > Deflection > Die on Hit options ticked
Render particles as object, preferably something where it is easy to see the motion blur
Add a plane with a Collision modifier under the particle system
Render a frame where some particles are dead and are no longer moving on the collision plane.

motionblur.blend

**System Information** Operating system: macOS-11.5.2-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon Pro 5600M OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.6.20 (Tested also on a Windows 10 PC + Nvidia GTX 1080) **Blender Version** Broken: version: 2.93LTS, 3.5 **Short description of error** Motion blur is rendered on dead particles that are still visible, such as particles that die on collision. Same for Eevee and Cycles renders, baked and not baked particles. ![motionblur.png](https://archive.blender.org/developer/F10410018/motionblur.png) **Exact steps for others to reproduce the error** - Enable default motion blur in either Eevee or Cycles. - Use a plane to create a Particle System with **Render** > **Extra** > **Dead** and **Physics** > **Deflection** > **Die on Hit** options ticked - Render particles as object, preferably something where it is easy to see the motion blur - Add a plane with a **Collision** modifier under the particle system - Render a frame where some particles are dead and are no longer moving on the collision plane. [motionblur.blend](https://archive.blender.org/developer/F10410022/motionblur.blend)

Alex commented

2021-09-14 01:08:58 +02:00

Added subscriber: @Xaynder

Lloyd commented

2021-09-15 10:51:42 +02:00

Added subscriber: @LloydAlmeida

Lloyd commented

2021-09-15 10:51:42 +02:00

This comment was removed by @LloydAlmeida

*This comment was removed by @LloydAlmeida*

Lloyd commented

2021-09-15 18:40:26 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Lloyd commented

2021-09-15 18:40:26 +02:00

Could only get this to work in Cycles after deleting the Cache. Had to set The Motion Blur > Position > Start on Frame in the Cycles Render settings.

This looks like a bug.

Could only get this to work in Cycles after deleting the Cache. Had to set The Motion Blur > Position > Start on Frame in the Cycles Render settings. ![mBlurTest.png](https://archive.blender.org/developer/F10420187/mBlurTest.png) This looks like a bug.

Philipp Oeser commented

2023-02-14 12:32:48 +01:00

If we move this out of the triaging queue (by changing status label to Needs Information from Developers), this needs to be the responsibility of a module (so a Module label must be added)

If we move this out of the triaging queue (by changing status label to `Needs Information from Developers`), this needs to be the responsibility of a module (so a `Module` label must be added)

Philipp Oeser added

Status

Needs Triage

and removed

Status

Needs Info from Developers

labels 2023-02-14 12:32:59 +01:00

Pratik Borhade commented

2023-03-23 05:39:13 +01:00

Can confirm.

Pratik Borhade added