cam_pos      = [-1.12991, 1.43915, 0.397398]';
cam_dir      = [0.28328, -0.0945818, 0.954362]';
cam_up       = [0.166587, 0.98485, 0.0481558]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.25613, -0.193306, -0.392011]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;