# Major Motion Blur Issues **URL:** \ **Category:** Issues\ **Created:** [September 15, 2022, 10:13pm UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999 "2022-09-15T22:13:50Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![sam\_wickert](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sam\_wickert](https://forums.chaos.com/u/sam_wickert)\ **Post date:** [September 15, 2022, 10:13pm UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/1 "2022-09-15T22:13:50Z")
I have been facing multiple vray 6 (3ds max) motion blur issues with scenes involving motion blur on vehicles with camera motion blur when using GPU rendering. Motion blur will either be exaggerated, or incorrect completely. Also, geometry is popping with the motion blur and is affected on certain frames. Videos of the issues can be found here: [https://www.dropbox.com/sh/sxgjsylao…I\_z9HtXva?dl=0](https://www.dropbox.com/sh/sxgjsylao0taicc/AACjYG321wr9T5eGI_z9HtXva?dl=0) ![image.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/3/0/30578d249db216e63b1bdcf5d49c10024e7e5391.jpeg) Here you can see exaggerated motion blur that is continuous (and shown in the videos)​ Has anyone faced these issues? Motion blur seems to corrected when rendering CPU. ---
**Author:** ![vladimir\_krastev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/vladimir_krastev/32/42177_2.png) [@vladimir\_krastev](https://forums.chaos.com/u/vladimir_krastev)\ **Post date:** [September 16, 2022, 8:03am UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/2 "2022-09-16T08:03:43Z")
HI what video card are you using, what is your driver version, what is your 3ds max/v-ray version? I watched the videos but cant really tell where are the issues. Could you share a CPU render of the same shot so we can compare in greater details? > I have been facing multiple vray 6 (3ds max) motion blur issues Does that mean that the animation you’ve sent renders differently in V-Ray 5 regarding motion blur? ---
**Author:** ![sam\_wickert](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sam\_wickert](https://forums.chaos.com/u/sam_wickert)\ **Post date:** [September 16, 2022, 8:18pm UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/3 "2022-09-16T20:18:36Z")
I have confirmed I’m also facing this issue in Vray 5. Ive attached a scene that shows the first half rendered with the gpu then the second is CPU. Same scene… you can see how the motion blur is handled much differently and correct with motion in the CPU, but not on the GPU. [https://www.dropbox.com/s/tn2p74lgbs…ndCPU.mov?dl=0](https://www.dropbox.com/s/tn2p74lgbst47a3/FirstHalfGPU-secondCPU.mov?dl=0) Its almost as if, even though the camera moves with the car, Vray is acting as though the motion blur is there for if the camera was moreso stationary. Madcar plugin is being used for the car animation, but I’ve also tried baking animation to keyframes to see if it would fix the issue -- currently no luck! ---
**Author:** ![sam\_wickert](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sam\_wickert](https://forums.chaos.com/u/sam_wickert)\ **Post date:** [September 16, 2022, 8:27pm UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/4 "2022-09-16T20:27:51Z")
> [@vladimir\_krastev](#): > > HI what video card are you using, what is your driver version, what is your 3ds max/v-ray version? I watched the videos but cant really tell where are the issues. Could you share a CPU render of the same shot so we can compare in greater details? > > Does that mean that the animation you’ve sent renders differently in V-Ray 5 regarding motion blur? as for the GPU -- nvidia 3090. 3ds max 2021/ vray 6 hotfix2 ---
**Author:** ![vladimir\_krastev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/vladimir_krastev/32/42177_2.png) [@vladimir\_krastev](https://forums.chaos.com/u/vladimir_krastev)\ **Post date:** [September 19, 2022, 3:13pm UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/5 "2022-09-19T15:13:42Z")
Hi I tested a similar setup. The camera moves together with the box but also pans a bit around the text. [http://ftp.chaosgroup.com/support/screenshots/pdplayer64\_2022-09-19\_18-03-39.gif](http://ftp.chaosgroup.com/support/screenshots/pdplayer64%5C_2022-09-19%5C_18-03-39.gif) Left is CPU, right is GPU. I see no difference so it looks like it is something specific to your scene that is causing differences. You could send it for review if you wish. Use the [support contact form](https://support.chaos.com/hc/en-us/requests/new) or just attach it here. ---
**Author:** ![sam\_wickert](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sam\_wickert](https://forums.chaos.com/u/sam_wickert)\ **Post date:** [September 20, 2022, 1:26am UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/6 "2022-09-20T01:26:33Z")
Please do take a look… can’t seem to figure this out… I’ve attached a link to a simple version of the project with the needed assets to see. [Dropbox - Error - Simplify your life](https://www.dropbox.com/s/omq0i710sf7mwr0/IssueTesting.max?dl=0) When scrubbing around frame 95 you will start to see the error in motion blur. ---
**Author:** ![vladimir\_krastev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/vladimir_krastev/32/42177_2.png) [@vladimir\_krastev](https://forums.chaos.com/u/vladimir_krastev)\ **Post date:** [September 21, 2022, 12:37pm UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/7 "2022-09-21T12:37:40Z")
Hi @sam_wickert Our highly skilled colleague @tashko.zashev was able to trouble shoot the scene and found out that if we have movie camera (V-Ray Physical camera) with a negative Shutter offset value (as in your scene) this leads to the wrong motion blur effect as seen in your examples. ![3dsmax_2022-09-21_15-22-54.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/4/b/4b14823c79de93770fc93c9e9a23249c47e1470d.jpeg) The issue reproduces in a simple scene. The issue is logged as a bug under VMAX-12573. ---
**Author:** ![sam\_wickert](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sam\_wickert](https://forums.chaos.com/u/sam_wickert)\ **Post date:** [September 22, 2022, 3:43am UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/8 "2022-09-22T03:43:19Z")
So glad you figured this out! Thank you! Looking forward to having this fixed in future releases as well! ---
**Author:** ![sam\_wickert](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sam\_wickert](https://forums.chaos.com/u/sam_wickert)\ **Post date:** [August 30, 2024, 7:40am UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/9 "2024-08-30T07:40:15Z")
Hey @vladimir_krastev This never seemed to be fixed and it’s now two years later.. or am I incorrect here? It’s a huge issue for matching camera work with accurate motion blur. ---
**Author:** ![vladimir\_krastev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/vladimir_krastev/32/42177_2.png) [@vladimir\_krastev](https://forums.chaos.com/u/vladimir_krastev)\ **Post date:** [August 30, 2024, 8:47am UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/10 "2024-08-30T08:47:51Z")
Hi, sorry to say the issue is still not fixed. I will update the report status with your message. ---
**Author:** ![sam\_wickert](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sam\_wickert](https://forums.chaos.com/u/sam_wickert)\ **Post date:** [August 30, 2024, 8:50am UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/11 "2024-08-30T08:50:41Z")
@vladimir_krastev Got it. Any way to track the progress / an estimate? I’m on a big job that this is really affecting. Thanks! ---
**Author:** ![vladimir\_krastev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/vladimir_krastev/32/42177_2.png) [@vladimir\_krastev](https://forums.chaos.com/u/vladimir_krastev)\ **Post date:** [August 30, 2024, 9:39am UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/12 "2024-08-30T09:39:15Z")
Hi unfortunately we’ve got no estimate for now. We will notify you in case there is any progress. ---
**Author:** ![Silvia\_Hong](https://avatars.discourse-cdn.com/v4/letter/s/278dde/32.png) [@Silvia\_Hong](https://forums.chaos.com/u/Silvia_Hong)\ **Post date:** [June 20, 2026, 10:02am UTC](https://forums.chaos.com/t/major-motion-blur-issues/111999/13 "2026-06-20T10:02:53Z")
Hey! I ran into something similar before and it turned out to be a combination of motion blur settings and sampling rather than the animation itself. Double-checking velocity data and increasing the relevant samples helped a lot in my case. As a quick way to compare the result frame-by-frame, I also used [Blur Part of a Video Online — Faces, Plates, Text | Zimblu](https://zimblu.co/blur-video/) to inspect blur artifacts in exported clips. It made it easier to spot whether the issue was coming from the render or the final encode.