cam_pos      = [-0.0853291, 1.50545, 1.52653]';
cam_dir      = [-0.96755, 0.0485847, -0.247963]';
cam_up       = [0.205964, 0.720123, -0.662572]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.194676, 0.92055, 0.939993]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;