cam_pos      = [0.226048, 1.06463, 0.608744]';
cam_dir      = [0.568983, 0.411289, -0.71211]';
cam_up       = [-0.786837, 0.524007, -0.326042]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.31794, -0.99195, -0.826953]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;