motion blur

For many types of movie shots, the default motion blur included with cryengine, is enough. But many sequences require a higher quality 3d motion blur. For example rotating objects, or blades of grass or leafs passing rapidly in front of the camera. Without a 3d motion blur these would look bad.

Or imagine a tornado made with high speed particles. I will upload a 3d motion blurred cryengine tornado movie in the future.

These insects look bad without 3d motion blur.

gif animation comparison

longer mp4 movie http://img684.imageshack.us/img684/6955/y33.mp4

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More proof (low quality for now)

                               animated gif :

Panning the camera behind close objects like foliage or railing or other objects would look bad without a 3d motion blur.

This type of filming usually occur in most movies at some point and if you don't have a raytrace motion blur you will get the artifacts shown in this comparison.