sio2TransformRotateZ camera slowly?

how can i rotate the camera slowly?

Check in example tutorial04, and the way I do the camera rotation, the lower the factor the slower the camera will turn...

thanks, but it still doesn't solve my problem.

what i want is, when i tap the screen, the camera will move forward with:

sio2->_SIO2camera->_btRigidBody->setLinearVelocity( btVector3( 0.0f, 5.0f,0.0f ) );

and after that, the camera should rotate 90 degrees.

my first problem is, how do i rotate after the camera has reached the specific point?

and my second problem is, when i'm using: ROT_Z = ( ( 1.570796327 * SIO2_RAD_TO_DEG ) * 0.0015f );

the camera doesn't stop after 90 degrees.

sorry for my bad english