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.
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?
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
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!
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 or just attach it here.
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
When scrubbing around frame 95 you will start to see the error in motion blur.
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.
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.
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 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.
