public Builder setFilter(
          org.box2d.proto.Box2D.PbFilter.Builder builderForValue) {
        if (filterBuilder_ == null) {
          filter_ = builderForValue.build();
          onChanged();
        } else {
          filterBuilder_.setMessage(builderForValue.build());
        }
        bitField0_ |= 0x00000020;
        return this;
      }