Method normalize

src/lua/LuaVector.cpp:150–171

int LuaVector::normalize(lua_State* L) {
  static std::vector<float> data;
  const int count = lua_gettop(L);
  data.resize(count + 1); // not using data[0]

  float sum = 0.0f;
  for (int i = 1; i <= count; i++) {
    const float v = luaL_checkfloat(L, i);
    data[i] = v;
    sum += (v * v);
  }
  sum = sqrtf(sum);
  if (sum == 0.0f) {
    return count;
  }
  lua_checkstack(L, count);
  const float scale = (1.0f / sum);
  for (int i = 1; i <= count; i++) {
    lua_pushfloat(L, data[i] * scale);
  }
  return count;
}


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