# [ODE] rotation matrix to direction vector

**travis cline
**
tclinecompappii at hotmail.com

*Mon Dec 23 21:13:01 2002*

My 2d alife simulation uses a vector to describe the direction in which the
agent is pointed. I need to determine the rotation about the z axis, I
realize this is possible with the dBodyGetRotation matrix. I belive I need
a primer on rotation matrices, can anyone help me out?
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