cam_pos      = [0.547537, 1.46242, 1.03971]';
cam_dir      = [-0.00601444, -0.0672359, 0.997719]';
cam_up       = [-0.0217873, 0.997509, 0.0670904]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.32966, 0.0283744, 0.00992759]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;