specular glass and motion blur = flicking

[AdrienG]

Hi,
Motion blur causes flickering in complex specular material (glass simple, no scatter).
No motion blur (shutter speed = 0) and no more problem.
Which parameter to deal with to get rid of this flicking ? i d like to keep the mb effect, or at least understand better.
Cheers

[BK]

Hi,
Motion blur causes flickering in complex specular material (glass simple, no scatter).
No motion blur (shutter speed = 0) and no more problem.
Which parameter to deal with to get rid of this flicking ? i d like to keep the mb effect, or at least understand better.
Cheers

Hi Adrien,

Thank you for the post.
Have you tried increasing the **Samples Per Frame** from the Vertex animated mesh>Shape node>AE editor>Octane Rollout.
Would you please share a sample scene for us to investigate if this does not fix?

cheers

[AdrienG]

thanks for your answer, i will try your recommandation now.
However, the deactivation of motion blur work seemed to attenuate the flickering on one shot but absolutely not on other shots.
See attachment video.
cheers

[AdrienG]

Ok i found the problem, very simple.
There's an overlap or very close distance between the specular mesh and a solid diffuse base/fixation.
Adding some distance between them fixed it. RayEpsilon could have been an other parameter to deal with i guess if there's any existing gap.

[elsksa]

Ray Epsilon is global, it’s rarely needed, typically when the scene scale has been wrongly setup, is small or large due to the context. It’s a common misconception to think of RE as some sort of magic tweak that fixes user-errors.