cam_pos      = [0.475473, 1.6543, 0.317042]';
cam_dir      = [0.479305, 0.397203, -0.782622]';
cam_up       = [-0.148445, 0.915568, 0.373764]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.15046, 0.0837512, -0.662073]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;