WRONG motion blur when camera follows a moving object

[LeSill]

Hello,

During the work on the animation, I encountered an issue related to motion blur. I have a scene where the camera follows a moving object, while the background remains static.

After the first render of the animation, I noticed unusual motion blur on the object that the camera follows as it falls to the ground. After researching the forum, I found that motion blur caused by camera movement is applied to the object without taking the object’s own movement into account. As a result, the object appears blurred even when its movement relative to the camera is minimal.

I also found information suggesting that the camera and the falling object should be placed under a single null object in the scene hierarchy, and that this null object should be animated instead.

However, this approach is not suitable in my case. The object moves at a different speed than the camera, and additionally, the camera’s target is also animated. Therefore, placing both the camera and the object under a single null object is not a viable solution.

Is it really the case that Octane cannot subtract the object’s motion from the camera’s motion in order to produce correct motion blur?

[Tim_Twisted]

Hi, sounds like a missing Octane tag on the moving objects. Every moving object needs it own tag for it to correctly render motion blur. Please share the scene if it is still not working.

[LeSill]

Hi,

That is not the issue. I have already applied the Octane tag to the moving objects.

I came across a discussion on the forum (moderated by Aoktar), where it was mentioned that to avoid motion blur being applied incorrectly—i.e., the object appearing blurred as if moving at the same speed as the camera—the object and the camera should be placed under a single NULL object, which is then animated.

However, this is not a practical or usable solution in cases where the object and the camera follow different paths and move at different speeds over time.

I can't share the scene

[jayroth2020]

Put an Octane Object tag on EVERYTHING, or, at least, the parent objects.