cam_pos      = [0.171076, 1.97671, 0.0925042]';
cam_dir      = [0.513023, -0.325469, 0.794278]';
cam_up       = [-0.209305, 0.849965, 0.483477]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.10718, 0.550994, -0.489347]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;