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Oops, my mistake i mixed up the checks... it does indeed check for 1 element (a 4 bytes float). This is the struct for cell attributes in aegis, and the check against water level uses h1 struct AttrCell { float h1; float h2; float h3; float h4; int flag; }; *Edit*: corrected the code in previous post

The athena way is what aegis uses, it reads the 4th dword in the cell info struct and compares it with the map water level read from the RSW, the code roughly looks like this (quick draft so i apologize if it's not so clear). { std::ifstream gat_fs(filename, std::ios::binary); VALIDATE_MAGIC(gat_fs, "GRAT", 4); gat_fs.read(reinterpret_cast<char *>(&m_verMajor), sizeof(char)); gat_fs.read(reinterpret_cast<char *>(&m_verMinor), sizeof(char)); gat_fs.read(reinterpret_cast<char *>(&m_width), sizeof(int)); gat_fs.read(reinterpret_cast<char *>(&m_height), sizeof(int)); m_cells.resize(m_width * m_height); gat_fs.read(reinterpret_cast<char *>(m_cells.data()), m_cells.size()); std::for_each(m_cells.begin(), m_cells.end(), [idx = 0](struct CAttrCell &cell) mutable { if (cell.flag == 1 || cell.flag == 5) m_TileInfo[idx] |= SVR_CELL_BLOCK; if (cell.flag != 1) m_TileInfo[idx] |= SVR_CELL_ARROW; if (cell.h1 > m_waterLevel) // m_waterLevel from RSW m_TileInfo[idx] |= SVR_CELL_WATER; ++idx; }); return 0; }