cam_pos      = [-0.182764, 2.03858, -0.161337]';
cam_dir      = [0.685308, -0.218105, 0.694826]';
cam_up       = [-0.0760965, 0.92743, 0.366173]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.963275, 0.404074, -0.823241]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;