fast rotational movement causing wrong display effect #71441

New Issue

HF · 2019-11-09T08:34:10+01:00

HF commented

2019-11-09 08:34:10 +01:00

System Information
Operating system: win10
Graphics card: rtx2070 super

Blender Version
2.8. 2.81eefd806afc15

Short description of error
i have a set of gear and the driver causing the gears to appear not rotating properly. the gear is one mesh not separated. and it rotates in 2 speed. before those two gear were separated and parented together, it had the exact same problem.Blender_ [C__Files_music box_gearbox.blend] 2019-11-09 00-55-15.mp4
this only happens then the gear is rotating very fast, when i turn down the speed it works fine, i wonder if its because that its spinning to fast that it looks like the gear is spinning backward. i think is this just a display issue
my speed on the driving gear is frame/50 . when i tried at 24fps its extremely slow, at 60 fps it looks faster. but when i tried frame/500(10 times slower) it looks significantly faster than the previous one.
in conclusion, i think this may just be a display issue because the gear is spinning too fast. in that case, fast-spinning gear will look slower than the slower spinning gear which i think is not what should happen. especially i have other gear as speed contrast. i can not just set the speed lower just so it will look fast, the other gear in the chain will also be slowed as well, therefore can not get the result i wanted.

frame/50 24 fps motion blur{F7998493} fast
frame/500 24 fps motion blur{F7998497} slow

i think a way to fix this is make motion blur react to the speed of the object. when the speed is fast makes the motion blur more exaggerated to give the illusion of speed. when the speed is slow, put less motion blur so it looks slower.

thanks

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

**System Information** Operating system: win10 Graphics card: rtx2070 super **Blender Version** 2.8. 2.81eefd806afc15 **Short description of error** i have a set of gear and the driver causing the gears to appear not rotating properly. the gear is one mesh not separated. and it rotates in 2 speed. before those two gear were separated and parented together, it had the exact same problem.[Blender_ [C__Files_music box_gearbox.blend] 2019-11-09 00-55-15.mp4](https://archive.blender.org/developer/F7997663/Blender___C__Files_music_box_gearbox.blend__2019-11-09_00-55-15.mp4) this only happens then the gear is rotating very fast, when i turn down the speed it works fine, i wonder if its because that its spinning to fast that it looks like the gear is spinning backward. i think is this just a display issue my speed on the driving gear is frame/50 . when i tried at 24fps its extremely slow, at 60 fps it looks faster. but when i tried frame/500(10 times slower) it looks significantly faster than the previous one. in conclusion, i think this may just be a display issue because the gear is spinning too fast. in that case, fast-spinning gear will look slower than the slower spinning gear which i think is not what should happen. especially i have other gear as speed contrast. i can not just set the speed lower just so it will look fast, the other gear in the chain will also be slowed as well, therefore can not get the result i wanted. frame/50 24 fps motion blur{[F7998493](https://archive.blender.org/developer/F7998493/framedivide50.mp4)} fast frame/500 24 fps motion blur{[F7998497](https://archive.blender.org/developer/F7998497/frame_divide_500.mp4)} slow i think a way to fix this is make motion blur react to the speed of the object. when the speed is fast makes the motion blur more exaggerated to give the illusion of speed. when the speed is slow, put less motion blur so it looks slower. thanks **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file (as simple as possible).

HF commented

2019-11-09 08:34:10 +01:00

Added subscriber: @Hongyu

HF changed title from ~~driver causing single mesh to rotate separately. also causing children to not follow parent display issue~~ to fast rotational movement causing wrong display effect

2019-11-09 08:37:04 +01:00

Germano Cavalcante commented

2019-11-11 15:06:55 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2019-11-11 15:06:55 +01:00

I believe this is similar to the Wagon-wheel_effect (although we can't expect a 3d viewport to represent all the physical effects of light).
I don't think it's a bug.

I believe this is similar to the [Wagon-wheel_effect ](https://en.wikipedia.org/wiki/Wagon-wheel_effect) (although we can't expect a 3d viewport to represent all the physical effects of light). I don't think it's a bug.

Jean First commented

2019-11-30 17:27:02 +01:00

Added subscriber: @robbott

Jean First commented

2019-11-30 17:27:02 +01:00

Changed status from 'Open' to: 'Archived'

Jean First closed this issue

2019-11-30 17:27:02 +01:00

Jean First self-assigned this 2019-11-30 17:27:02 +01:00

Jean First commented

2019-11-30 17:27:02 +01:00

Thanks for the report, but the issue reported here is a request for modified/improved behavior and not a bug in current behavior. Closing as this bug tracker is only for bugs and errors.

For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

Thanks for the report, but the issue reported here is a request for modified/improved behavior and not a bug in current behavior. Closing as this bug tracker is only for bugs and errors. For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

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fast rotational movement causing wrong display effect #71441