public Builder clear() {
        super.clear();
        id_ = 0;
        bitField0_ = (bitField0_ & ~0x00000001);
        if (polygonBuilder_ == null) {
          polygon_ = org.bwapi.proxy.messages.TerrainMessages.Polygon.getDefaultInstance();
        } else {
          polygonBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000002);
        chokepoints_ = java.util.Collections.emptyList();
        bitField0_ = (bitField0_ & ~0x00000004);
        baseLocations_ = java.util.Collections.emptyList();
        bitField0_ = (bitField0_ & ~0x00000008);
        return this;
      }