private void UpdateGeometry()
{
// create orthornormal basis from lookAt and up vectors
m_lookAt = m_lookAtPoint - m_eye;
m_lookAt.Normalize();
m_right = Vec3F.Cross(m_lookAt, m_up);
m_right.Normalize();
m_up = Vec3F.Cross(m_right, m_lookAt);
//m_up.Normalize(); // m_right is already unit length
m_lookAtDistance = Vec3F.Distance(m_eye, m_lookAtPoint);
if (ProjectionType == ProjectionType.Orthographic)
{
SetOrthographic(m_lookAtDistance);
}
else
{
OnCameraChanged(EventArgs.Empty);
}
}