cam_pos      = [-0.0396193, 1.08699, 0.488506]';
cam_dir      = [-0.582511, 0.447224, -0.678728]';
cam_up       = [0.79833, 0.471769, -0.374302]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.203232, 1.01065, 0.840353]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;