cam_pos      = [-0.314208, 0.923134, -0.299207]';
cam_dir      = [0.947893, 0.0541338, -0.313956]';
cam_up       = [0.317201, -0.068471, 0.945883]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0395108, 1.32492, 0.109159]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;