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Motion blur steps
This parameter, usually found in the Render Options of the plug-in, controls how many times Maxwell should sample the motion of the animation, given a certain exposure time set by the camera parameters and/or the animation fps. If your exposure time is long and your object doesn't move in a straight line during that time, you should set the steps high enough to smoothly capture the different positions of the object moving. You should also set the steps high enough if you have fast rotating objects, like a propeller, which can rotate several hundred degrees even between two frames. Maxwell will take the number of samples between those two frames (called sub frame samples) that you set in the step setting.
In general term, if If the motion path you are getting in the render is different to the expecteddoesn't look smooth, this may be caused by an insufficient number of substepssteps. Increasing Increase them on the scene export may provide a more accurate until the motion path looks smooth.
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