/*@brief Return the transform of the vector */
public static void Apply( ref btTransform t, ref btVector3 x, out btVector3 result )
{
t.Apply( ref x, out result );
}
/*@brief Set the current transform as the value of the product of two transforms
@param t1 Transform 1
@param t2 Transform 2
This = Transform1 Transform2 */
public void mult( ref btTransform t1, ref btTransform t2 )
{
t1.m_basis.Apply( ref t2.m_basis, out m_basis );
t1.Apply( ref t2.m_origin, out m_origin );
}