message: MeshAssimp: fix glTF material hash function.
  I noticed this while working on the new lighter weight loader.
diff: @@ -93,7 +93,7 @@ void appendBooleanToBitMask(uint64_t &bitmask, bool b) {
  uint64_t hashMaterialConfig(MaterialConfig config) {
  uint64_t bitmask = 0;
  - memcpy(&config.maskThreshold, &bitmask, sizeof(config.maskThreshold));
  + memcpy(&bitmask, &config.maskThreshold, sizeof(config.maskThreshold));
  appendBooleanToBitMask(bitmask, config.doubleSided);
  appendBooleanToBitMask(bitmask, config.unlit);
  appendBooleanToBitMask(bitmask, config.hasVertexColors);
  