Babby buggy

Integrating 3D models with photography

Interested in integrating your 3D work with the real world? This might help

Watch

# 1 24-09-2006 , 02:24 AM

Subscriber
Join Date: Sep 2002

Location: Northampton

Posts: 249

Hi all.
I need to animate a baby buggy but I want to create a expression so the when the buggy is translated in the +x and -x direction I want the wheels to rotate accordingly.

Can anyone help with this?

Thanks guys..

It is by my will alone I set my mind in motion

Quote

# 2 24-09-2006 , 06:02 AM

Registered User
Join Date: Feb 2005

Location: This Place

Posts: 220

The basic form of the equation you're going to need is:

degrees rotated = (360 x distance traveled) / (2 x pi x radius of wheel).

The general form of the Expression you're going to need will be'

wheel.rotateZ = (360 * wheel.translateX) / (2 * 3.1415 * [radius of wheel]);

Now, obviously, I have no idea what the radius of your wheel is, so you'll have to find that out yourself. And pi can be used as '3.1415' or to any number of other places (although I think there's a way to summon the exact value in maya, I can't think of it at the moment - and in most instances you're probably not going to need anything more than the 4 digits or so.).
Also, depending on how you have the rig set up, you may have to change what the wheel uses to grab its translation (for example, if you have the wheel parented to something, moving the object won't actually change its location - it'll be at a local '0'). Just be aware of things like that.

That help?

Book Wise

https://X4nd5r.deviantart.com

Quote