public int getSerializedSize() {
      int size = memoizedSerializedSize;
      if (size != -1) return size;
    
      size = 0;
      if (((bitField0_ & 0x00000001) == 0x00000001)) {
        size += com.google.protobuf.CodedOutputStream
          .computeInt64Size(1, tag_);
      }
      if (((bitField0_ & 0x00000002) == 0x00000002)) {
        size += com.google.protobuf.CodedOutputStream
          .computeEnumSize(2, type_.getNumber());
      }
      if (((bitField0_ & 0x00000004) == 0x00000004)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(10, position_);
      }
      if (((bitField0_ & 0x00000008) == 0x00000008)) {
        size += com.google.protobuf.CodedOutputStream
          .computeFloatSize(11, angle_);
      }
      if (((bitField0_ & 0x00000010) == 0x00000010)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(12, linearVelocity_);
      }
      if (((bitField0_ & 0x00000020) == 0x00000020)) {
        size += com.google.protobuf.CodedOutputStream
          .computeFloatSize(13, angularVelocity_);
      }
      if (((bitField0_ & 0x00000040) == 0x00000040)) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(14, force_);
      }
      if (((bitField0_ & 0x00000080) == 0x00000080)) {
        size += com.google.protobuf.CodedOutputStream
          .computeFloatSize(15, torque_);
      }
      if (((bitField0_ & 0x00000100) == 0x00000100)) {
        size += com.google.protobuf.CodedOutputStream
          .computeFloatSize(16, mass_);
      }
      if (((bitField0_ & 0x00000200) == 0x00000200)) {
        size += com.google.protobuf.CodedOutputStream
          .computeFloatSize(17, i_);
      }
      if (((bitField0_ & 0x00000400) == 0x00000400)) {
        size += com.google.protobuf.CodedOutputStream
          .computeFloatSize(50, linearDamping_);
      }
      if (((bitField0_ & 0x00000800) == 0x00000800)) {
        size += com.google.protobuf.CodedOutputStream
          .computeFloatSize(51, angularDamping_);
      }
      if (((bitField0_ & 0x00001000) == 0x00001000)) {
        size += com.google.protobuf.CodedOutputStream
          .computeFloatSize(52, gravityScale_);
      }
      if (((bitField0_ & 0x00002000) == 0x00002000)) {
        size += com.google.protobuf.CodedOutputStream
          .computeBoolSize(53, bullet_);
      }
      if (((bitField0_ & 0x00004000) == 0x00004000)) {
        size += com.google.protobuf.CodedOutputStream
          .computeBoolSize(54, allowSleep_);
      }
      if (((bitField0_ & 0x00008000) == 0x00008000)) {
        size += com.google.protobuf.CodedOutputStream
          .computeBoolSize(55, awake_);
      }
      if (((bitField0_ & 0x00010000) == 0x00010000)) {
        size += com.google.protobuf.CodedOutputStream
          .computeBoolSize(56, active_);
      }
      if (((bitField0_ & 0x00020000) == 0x00020000)) {
        size += com.google.protobuf.CodedOutputStream
          .computeBoolSize(57, fixedRotation_);
      }
      for (int i = 0; i < fixtures_.size(); i++) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(100, fixtures_.get(i));
      }
      size += getUnknownFields().getSerializedSize();
      memoizedSerializedSize = size;
      return size;
    }