Scripting Question

# 1 18-08-2003 , 09:00 PM

Registered User
Join Date: May 2003

Location: Orlando, FL

Posts: 13

Does anyone know of the expression to use to adjust and objects velocity/acceleration. For example i have a ring and i want to make it start spinning really fast and gradualy come to a halt slowing down speed over time. What would be the easist way to script this?

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# 2 18-08-2003 , 09:48 PM

The Maya Mountain
Join Date: Aug 2002

Location: Seattle, WA

Posts: 8,245

OBJECTNAME.rotateY = 100/(frame/500);

You'd substitute the rotation direction with whichever direction you want.

You'd also want to experiment with the number amounts to get the speed you want.

-Mike
The Maya Toolbelt

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# 3 18-08-2003 , 09:53 PM

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Join Date: May 2003

Location: Orlando, FL

Posts: 13

Thanks ill try that now. user added image

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# 4 18-08-2003 , 10:03 PM

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Join Date: May 2003

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How bout make it spin like that and slow and then come to a complete stop at its original location?

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# 5 19-08-2003 , 02:06 AM

The Maya Mountain
Join Date: Aug 2002

Location: Seattle, WA

Posts: 8,245

You'd have to figure out the math for that, I'm afraid. I'm not sure what you'd need to do to get it to stop on a dime.

-Mike
The Maya Toolbelt

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# 6 21-08-2003 , 02:34 AM

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Join Date: Jan 2003

Posts: 161

The easiest way to do this is by keyframing the animation. Set a few keys, mess with the tangents a bit, and you'll get the result you need.

Alternatively, if you're looking for a generalized velocity/acceleration solution, consider using particle or solid body dynamics. You can apply forces or accelerations and rely on the dynamics solver to figure out the resulting motion.

Finally, you can try using a mathematical expression for the rotation. This is my least favorite approach because it requires figuring out how you want the velocity to change and then essentially analytically integrating it, which if you don't recall your calculus very well is going to be a trouble-filled, trial-and-error endeavor.

-- Mark

Mark R. Wilkins
author of MEL Scripting for Maya Animators
www.melscripting.com

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