I'm having trouble to find a way to set the interpolation before a keyframe. For example, this is useful if you want to animation to continue before the first frame and after the last frame to get correct motion blur.
I haven't found a way in the UI either, as setting the interpolation to linear is not acting the way I want.
Is there a way to do this?
Attaced is an example from Nuke where the interpolation is set to linear before the keyframe (which makes the animation continue).