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Carrara F.A.Q (Last Updated: 2026 Jun 21 11:17 pm)

 

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Subject: animation/tweener troube


robertzavala ( ) posted Mon, 18 August 2003 at 6:17 PM ยท edited Sat, 06 June 2026 at 3:17 AM

Trying to create a DVD menu as a beginner project in animation. I've modeled a ring that I want to spin on its z axis fast and then slowly come to a stop.

Adjusting using ANY tweener curve doesn't make any change to the object. I'm wondering if that's because I used the preset spin modifier (fixed number of cycles per second). If so, any ideas on how I can make the ring spin 360 degrees?

I tried just creating keyframes, but the rotation limit is 180 degrees. Like I said, I'm a beginner at this, so any help would be greatly appreciated.


MarkBremmer ( ) posted Mon, 18 August 2003 at 6:34 PM

file_72274.jpg

You can change the rate of spin over time and keyframe the behavior.






Kixum ( ) posted Mon, 18 August 2003 at 7:34 PM

Marks right. Set your cycles per second to whatever you want at the beginning of time and then set it to zero at the second key frame. Then play with the tweener. The rate in which the cycles per second changes from the two values you've picked (a bunch to zero for your case) is made by the tweener. The cycles per second at the end points (time zero and time whatever) are chosen by you. -Kix

-Kix


montebach ( ) posted Tue, 19 August 2003 at 3:55 PM

Thanks for the replies, but I've only got it half-working. The spin now varies speeds, but reverses itself halfway through the animation and spins in the opposite direction. I'm sure its a rookie mistake, but I can't seem to find out what I'm doing wrong. And if I might expand on my original project, does anybody know of an easy way to realistically animate the ring spinning perpendicular to the floor and slowly coming to rest parallel, like when a coin spins or falls on a hard surface. Thanks again. Tha


montebach ( ) posted Tue, 19 August 2003 at 4:05 PM

BTW -- I posted the original question, I just used a freind's login mistakenly.


MarkBremmer ( ) posted Tue, 19 August 2003 at 6:22 PM

What you are seeing is a visual pattern created by differing rotation rates fighting with the frame rate. It's like watching a television show where a wheel that has spokes appears to start turning backwards as the vehicle slows down. I had the exact same problem on one of my own animations and simply had to play with it to find the ideal combination of spin rate, seconds to stop and frame rate that avoids the 'backward' spin. It can be done though!






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