Cycles Motion-Blur not Accurate in Cycles #44005

New Issue

Valentin Schwarze · 2015-03-15T16:49:22+01:00

Valentin Schwarze commented

2015-03-15 16:49:22 +01:00

System Information
Windows 7, 64 bit
Nvidia GeForce GT 650M
Intel i7 3610QM
6 GB RAM

Blender Version
Broken: Official Blender 2.73a, bbf09d9

Short description of error
Motion blur is not accurate in Cylcles, when partciles fly curves tracks, as these particles get blurred in staight lines.

For better explanation:

This picture - http://www.pasteall.org/pic/85265 - is renderdered in BI and shows the real track of the particles (by using the trail option).

Same particle system in Cycles ( rendered with motion blur) does not show curved particle traces, but rather straight lines: http://www.pasteall.org/pic/85264

Exact steps for others to reproduce the error
Blend File: http://www.pasteall.org/blend/35039

Open blend file, go to frame 100 and render. Then compare motion blur with particle track.

**System Information** Windows 7, 64 bit Nvidia GeForce GT 650M Intel i7 3610QM 6 GB RAM **Blender Version** Broken: Official Blender 2.73a, bbf09d9 **Short description of error** Motion blur is not accurate in Cylcles, when partciles fly curves tracks, as these particles get blurred in staight lines. For better explanation: This picture - http://www.pasteall.org/pic/85265 - is renderdered in BI and shows the real track of the particles (by using the trail option). Same particle system in Cycles ( rendered with motion blur) does not show curved particle traces, but rather straight lines: http://www.pasteall.org/pic/85264 **Exact steps for others to reproduce the error** Blend File: http://www.pasteall.org/blend/35039 Open blend file, go to frame 100 and render. Then compare motion blur with particle track.

Valentin Schwarze commented

2015-03-15 16:49:22 +01:00

Changed status to: 'Open'

Valentin Schwarze commented

2015-03-15 16:49:22 +01:00

Added subscriber: @ValentinSchwarze

Sergey Sharybin self-assigned this 2015-03-16 08:53:48 +01:00

Sergey Sharybin commented

2015-03-16 08:53:48 +01:00

AFAIR, curved motion interpolation was disabled in Cycles because of some artifacts. Will need to look deeper into code, will do it within few days.

Alex de Mulder commented

2015-03-27 08:42:13 +01:00

Added subscriber: @alexdemulder

Alex de Mulder commented

2015-03-27 08:42:13 +01:00

I would also be very interested in a fix for this. I'd really prefer not to use vector blur in production images but deadlines are coming up. Is this by chance in the 2.74 RCs? thanks for the great work!

Sen Haerens commented

2015-04-09 12:21:05 +02:00

Added subscriber: @SenHaerens

Sergey Sharybin commented

2015-05-26 19:19:06 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2015-05-26 19:19:06 +02:00

Sergey Sharybin commented

2015-05-26 19:19:06 +02:00

Checked the history and some other related reports. Currently object motion is only limited to 2 steps only, which is not enough for such a long shutter.

Surely supporting more object steps is a nice thing to have, but it'll be handled outside of the bug tracker work.

I've made sure the report is linked from http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles/ToDo and archiving it as a TODO now. Thanks for it anyway!

Checked the history and some other related reports. Currently object motion is only limited to 2 steps only, which is not enough for such a long shutter. Surely supporting more object steps is a nice thing to have, but it'll be handled outside of the bug tracker work. I've made sure the report is linked from http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles/ToDo and archiving it as a TODO now. Thanks for it anyway!

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Cycles Motion-Blur not Accurate in Cycles #44005