cam_pos      = [0.477553, 1.65608, 0.313685]';
cam_dir      = [0.378274, 0.127187, -0.916914]';
cam_up       = [-0.022416, 0.991484, 0.128283]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.23081, 0.0372036, -0.502612]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;