public Builder setShape(
          org.box2d.proto.Box2D.PbShape.Builder builderForValue) {
        if (shapeBuilder_ == null) {
          shape_ = builderForValue.build();
          onChanged();
        } else {
          shapeBuilder_.setMessage(builderForValue.build());
        }
        bitField0_ |= 0x00000040;
        return this;
      }