Motion Blur

[paul.clements]

I am trying to render a 25fps scene in slow motion by setting the frame rate in the render settings to 200fps.

This all works fine until I turn on motion blur. Arnold renders the identical first frame image many times. Am I missing something?

[peter.horvath6V6K3]

Currently motion blur is calculated with the modified fps (200 fps in your case). So the default 0.5 Motion Blur length means 0.5 frames in 200 fps (= 0.0025 sec). I guess what you would expect is calculating motion blur with the original 20 fps (e.g. multiply length by 8)? Is that the case?