[ODE] Lock a rotation axis

[Jon Watte]

There is no such thing as a "z rotation axis". What you want to do is probably something like "find a rotation that makes the front vector of body B point in the projection of vector R to the XY plane, while making the up vector of B point in the Z direction".

Once you formulate that, constructing a rotation that will take your current orientation and turn it into that is a simple matter of cross and dot products.

Cheers,

            / h+

-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf Of Alessandro Monopoli
Sent: Friday, May 21, 2004 6:40 AM
To: ode at q12.org
Subject: [ODE] Lock a rotation axis


Hi all!

I'de like to "lock" the "z" rotation axis, so that it always is 0.
How can I do this?

Bye and thanks!