Hi all,
I always used LookAt matrix transposed to create the quaternion but I would change to use quaternion directly to be more efficient.
Here the code I use :
CQuaternion QuaternionFromDirection( const CVector3& Direction )
{
const float Dot = VectorDot( CVector3( 0.0f, 0.0f, 1.0f ), Direction );
if( CMath::Abs( Dot + 1.0f ) < CMath::EPSILON )
return CQuaternion( CVector3( 0.0f, 1.0f, 0.0f ), CMath::PI );
else if( CMath::Abs( Dot - 1.0f ) < CMath::EPSILON )
return CQuaternion( 0.0f, 0.0f, 0.0f, 1.0f );
const CVector3 Axis = VectorCross( CVector3( 0.0f, 0.0f, 1.0f ), Direction ).Normalized();
const float Angle = CMath::ACos( Dot );
return CQuaternion( Axis, Angle );
}Is it the correct way to achieve that ? A up vector is needed to be more safe ?
If a up vector is needed, what is the best way to achieve that ?
Thanks for the help
