public Builder setLocalAnchorB(
          org.box2d.proto.Box2D.PbVec2.Builder builderForValue) {
        if (localAnchorBBuilder_ == null) {
          localAnchorB_ = builderForValue.build();
          onChanged();
        } else {
          localAnchorBBuilder_.setMessage(builderForValue.build());
        }
        bitField0_ |= 0x00000040;
        return this;
      }