I’m doing a simple animation in rotating an object thru 80 revolutions (28800 degrees).  In the playback, the object spins, then stops and changes directions, then stops and changes directions again.  I don’t see anything out of the ordinary in the track view.  Sample avi (from Make Preview) and screen capture of track view attached.  I’m trying to spin this object to make it look like it’s bluring, then I’m going to fade in another object that will spin and come to a stop. 

Thanks,

Kenn

Modeled and Rendered on Max 2010 64 bit version

	Attachment

for some reason I can’t get the AVI to attach unless you can only attach one item.  I tried a ZIP file but still won’t attach.  Hopefully the trackview will tell what’s wrong. 

-kenn

Sample avi (from Make Preview)

The AVI didn’t make it. Filenames beggining with a underscore won’t work, try renaming the preview file.
It may also be useful to attach the scene, or a small part of it.
It may just be an illusion from the high speed of the rotation relative to the frame rate, like when you see footage of a car’s wheel or helicopter’s rotors and they appear to be going backwards.

retry of avi file attachment

-kenn

	Attachment
scene.zip

I tried replicating it with the same values (250 frames, 28800 degrees) slow to fast curve.
The graph shows it is rotateing in one direction. I believe it is an optical illusion due fast rotation with relaively low sampling of the frame rate.
Consider how many degrees it turns from one frame to the next when it has speeded up (advance the anim a frame at a time and look). Also the object has has 4 points of rotational symetry (every 90deg). When these frames are viewed in sequence, without motion blur, it may well cause this illusion.
Motion blur may help. but you won’t get away with fast image MB, you will need the slow multi-pass method to account for the high time sampling needed.