2021 Wavefront Material Template Library MTL is a companion file for the Wavefront OBJ file. The MTL file describes surface shading properties for use by one or more OBJ. 170 Archaeology Data Service / Archaeology Data Service 20 Aug 2018 20 Aug 2018 fmt/1211 PUID mtl File extension 1589 Wavefront Material Template Library BOF, offset 0-1024, 'newmtl' <name> {0-80} (Ka|Kd|Ks) <space> 1 Absolute from BOF 0 1024 6E65776D746C{0-80}(4B61|4B64|4B73)20