Grammar for Binary STL (stereolithography) files https://en.wikipedia.org/wiki/STL_(file_format) STL binary format uses es the IEEE integer and floating point numerical representation. 80 characters (uint8) header Number of Triangles (facets) - 4-byte little endian unsigned integer Structure defines a facet In cartesian system, any vector is represented in terms of its unit vectors. The unit vectors along x-axis, y-axis and z-axis are represented by i, j and k respectively. It is specified that the attribute byte count should be set to zero.