Big Motion Blur Issues In Cycles (And How To Fix) 

*BRO I HAVE BEEN SEARCHING FOR THIS ISSUE FOR SO LONG AND YOU FIXED IT, THANK YOU*

I can't believe how easy it is to fix this glitch. I use lattice mod, a lot, on my personal artwork. I do abstract stuff. Lately I've been avoiding rendering animations because of how time expensive it is to go frame by frame, seeing which one is glitched and then re-rendering it without motion blur. I've ran into this issue with client work and it is THE WORST, when deadlines are tight, the last thing you want is having to fix a bunch of glitchy frames. I can't thank you enough dude!

This is the best kind of tutorials. You not only showed how to fix a problem, but also explained what the problem is about! Thank you and keep up the great work, you earned my sub!

This was so helpful! I've been struggling with this issue and resorting to photoshop cleanup. Thanks a ton!

This is probably the best video on RU-vid. Thank you for getting to the bottom of this issue. You've thoroughly covered the subject and possible solutions for different cases better than any other resource. Thank you!

Oh man, thanks! Disabling deformation motion blur saved my day, ufffff 😌

This is very helpful, thanks!

Thankkkkk you so much! It was very helpful!!

this is a great video, thank you so much

Very cool! Just experienced this myself, definitely seemed to address the issues. Thank you sir!

amazing stuff thanks for sharing as this was a head scratching issue i didnt quite understand until i learned how motion blur actually functions

Great video!! If you want deformations on your first example, you could probably have a duplicate of the geometry without the modifiers and transfer the velocity attribute from one to the other with geo nodes

You saved my life bro! 8h before deadline this issue arises! THANK YOU!

thanks you so much! gold video

thankyou so much man, this is all i need

Thank you so much!!!

The best way I found, that is not mentioned in the video is to make the sharp edges (you could do it by hand or click "Add custom split normals data"), then add split edges modifier and turn off the angle parameter. Ideally, place the modifier before any mesh transformation. DON'T FORGET TO TURN OFF AUTOSMOOTH!!! The problem is probably that autosmooth recalculates and splits the vertices on each frame based on mesh transformation. But the split has to be done BEFORE the transformation so that the indices don't get reassigned.

just had the same error with a rendering and then remembered your video! Saved me a lot of time! Thanks a lot!

THANK YOU SO MUCH DUDE!!

omg i had this problem so often in the past! Thanks for the video!

Sweet god i spend around 10 hours trying various strategies how to get rid of these glitches when having motion blur and rigged human. You saved my day, thank you very much man

MAN YOU ARE JUST AWESOME.

THANK YOU!

THANK YOU! For MONTHS, I was like, "What the hell is going on with my renders? Is Blender possessed or something?!"

Great! Thanks!!

Thank you so damn much 😊

thank you for saving my life

God... finally!!! Thank you soooo much. When i worked on huge projects, i had the same issue, i had to fix it manually by picking the specific frame and fixing the frame with Photoshop.. it was a huge pain on my as* Thank you soo much for this information

YOO. you saved my life. i ve been struggling with this issue while work for commission. thanks

I was having this issue with cage deformer on a character and no change in topology, thanks! :)

I cannot believe I just deactivated motion blur for every scene this happened. I feel like an idiot after seeing you can disable by object! It's a pain in the ass for abstract stuff. THANK YOU SO MUCH

Nice! I thought it was a weight map issue like some unassigned vertex because I altered the Mixamo weights. Only one object was glitching, with no modifiers or FX on it, but turning off Deformation in the object MB panel worked for me. Thanks man!

thanks sir!

THANKS!

Thank you sir

Thank you :')

LOVE YOU.

So how about the camera? When I switch to other scenes and also no movements between two frames, but it’s still glitching

you are my lifesaver. you have no idea how many hours of my life i wasted trying to figure out how to fix this LOL

Is it possible this can now be fixed in 4.1 by using the Shade Smooth by Angle option instead of the Auto Smooth modifier? I’m curious if they produce the same results shading wise and if a mesh that previous used Auto Smooth can be converted to Shade Smooth by Angle with no adverse shading issues.

that's does work with version bellow 4.0. since 4.0 blender had removed auto smooth. in 4.1 I had that problems again but this time had no auto smooth to turn off

hi , I use blender 4.0 but there is no deformation checkbox.

I find rendering the animation without motionblur as image sequence and then rendering the frames in after effects or back through blender VFX produces nicer results with lower render times compared to with motion blur. Also you can get more customization out of your motion blurs in composition nodes. Maybe things have improved over the years but I've always had issues with how the motion blur looks inside blender.

Nice one

king

What if instead of rendering the original object, you have a higher-poly object you shrink-wrap around the object that has changing topology, and you keep the original object invisible?

You could try using weighted normal modifier combined with Auto Smooth.

Thank you. But what to do if we are using armature modifier, which is in fact deforming mesh, and is probably most common scenario? Then switching off Deformation in Object's MB options will kill needed Motion Blur.

still doesnt help, im using RBC addon to control cars, when i activate motion blur the wheels are going crazy in some frames, idk what to do?? i tried everything, disabling motion blur helps but it doesnt look good..

it also happens to my alembic hairs and I report this glitch their solution is set auto smooth to 180

I just stopped using motion blur and replaced it with vector blur. It's true that it's not as good as the regular motion blur, but the differences were so small it doesn't matter to me. I was just done having to constantly debug the motion blur issue hunting down which object needs modifiers adjusted, which one should have blur disabled, which one needs smooth normals disabled.. nope.. screw that, vector blur all the way baby.

Brooo, you just saved my life 😂😂

respect

Are you gonna make overpaint or any painting videos? Or you switched to fully making game/animations?

is there a fix for this for EEVEE? I'm having the same glitch with Eevee Rendering

counter to your point about not using auto smooth; Bevel + weighted normals modifiers make everything better and weighted normals needs autosmooth

lol I wish I knew why auto smooth broke stuff, it broke so many things in my proj and I didn't realize :facepalm:

the blender 4.0 has no deformation option..what should i do?

Blender 4.0 doesn't have Motion Blur Deformation so I used this fix instead: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-wLYanQyUHLY.html

my motion blur issues was mostly from fluidsim

I now realise why my motion blur hair takes so long........ every hair has lots of vertices in it.

Studio Driver version 555.85 Fixed Application Bugs Blender Cycles: Motion blur renders incorrectly with some GPU architectures [4607411]

Turn off Auto Smoothing- Thank you so muh

OP Tutorial

7:26

A lot of nonsense, you are teaching, not acting.

Thank you so much!