cam_pos      = [0.425445, 1.52815, 1.20945]';
cam_dir      = [-0.0510044, -0.116025, -0.991936]';
cam_up       = [-0.544381, 0.83593, -0.0697859]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.11359, -0.713455, 0.140711]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;