Exemple #1
0
//--------------------------------------------------------------------------------------------------
/// Repositions and orients the camera to view the rotation point along the 
/// direction "alongDirection". The distance to the rotation point is maintained.
///
//--------------------------------------------------------------------------------------------------
void ManipulatorTrackball::setView( const Vec3d& alongDirection, const Vec3d& upDirection )
{
    if (m_camera.isNull()) return;

    Vec3d dir = alongDirection;
    if (!dir.normalize()) return;
    Vec3d up = upDirection;
    if(!up.normalize()) up = Vec3d::Z_AXIS;
    
    if((up * dir) < 1e-2) up = dir.perpendicularVector();

    Vec3d cToE = m_camera->position() - m_rotationPoint;
    Vec3d newEye = m_rotationPoint - cToE.length() * dir;

    m_camera->setFromLookAt(newEye, m_rotationPoint, upDirection);
}