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In the Maxwell camera settings you can pick "Use rotary shutter" and set the shutter angle, by default 180º. Setting the angle smaller means the film will be exposed to light for a shorter time - less motion blur. You can set it all the way to 360º which means effectively there is no shutter blocking the light and the motion blur will be based purely on the frames per second setting of your animation.
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If you wish to mimic the typical long exposures you can get with a photo camera, even several seconds long, you should use the shutter speed and set it accordingly - 1/1 for one second, 1/0.5 for 2 seconds, 1/0.25 for 4 seconds etc. |
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.
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Maxwell Render can calculate two types of motionblur: for the entire object and also for individual moving vertices of the object (deformation motionblur). As deformation motionblur needs more RAM when rendering (depending on the number of vertices the object has), and is only needed if the object actually deforms, you have the choice to activate only normal motion blur or also deformation motion blur.