cam_pos      = [0.419774, 1.59737, 0.394243]';
cam_dir      = [0.629256, 0.189855, -0.753652]';
cam_up       = [-0.0629458, 0.978968, 0.194059]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.03028, 0.0993158, -0.835203]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;