Plane is simply rotating on Z axis around origin from 0 deg to infinity (linear interpolation), AN extracts this rotation from polygon. Extracted motion looks fine but it isn't calculated as cumulated/continuous value. Every 180 degrees it is switching sign from
Look at Z value here:
Can this rotation be recalculated to match input motion? I was planning to change some values inside material in [0-1] range using growing angle, but unable to do it with current behaviour.