Motion blur can enhance the realism of a rendered animation by simulating the way a real-world camera works. A camera has a shutter speed, and if significant movement occurs during the time the shutter is open, the image on film is blurred.
3ds Max provides a variety of ways to apply motion blur:
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Image Motion Blur applies motion blur to entire frames of an animation.
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Motion Blur Rendering Effect lets you apply image motion blur as a rendering effect.
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Multi-Pass Rendering Effect applies motion blur to frames by offsetting the camera in multiple rendering passes. You can preview multi-pass rendering effects in camera viewports.
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Particle Motion Blur uses a material map to blur moving particles in a particle system.
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Scene Motion Blur lets you apply motion blur as a Video Post effect.
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Object Motion Blur applies motion blur to specified moving objects in a scene. Object motion blur is best for making fast-moving objects appear to move more smoothly.