Optionalfiletext: string | ArrayBufferOptionalfileName: stringOptionaladjustZtoY: booleanOptionalunit: unitOfLengthEnumThe file's text for .step, .stp, .iges and .igs, or an ArrayBuffer for the compressed
.stpz and .igz forms.
OptionalfileThe file name; its extension decides whether it is read as STEP or IGES and whether it is compressed.
OptionaladjustWhen true, the shape is turned so the file's Z-up becomes this library's Y-up.
OptionalunitThe unit the shape comes back in, scaled from whatever unit the file is written in.
io.fileLengthUnit tells which that is.
File content, a file name and an axis option for
io.loadSTEPorIGES, which reads STEP or IGES into a shape.