This is a great 3D CAD data file viewer. It supports the most popular 3D CAD formats including STEP(.stp or .step), STL, Parasolid(.x_t or .x_b), ACIS(sat or sab), JT, IGES(.igs or .iges), SpaceClaim(.scdoc), DWF, DAE and DXF. Those formats are widely used by almost all popular 3D CAD, CAM, CAE, PLM applications including CATIA, Autodesk Inventor, AutoCAD, SolidWorks, NX, ProE (PTC Creo, ProEngineer), TurboCAD, SolidEdge, SpaceClaim, etc. The app provides many 3D features including rotating, panning, zooming in/out, changing rendering color, choosing surface or wireframe rendering mode, etc. It also provides you information about your files, for instance, the file size, the height, width and depth of your model, total surface area, total volume, etc. The app supports loading multiple models at the same time so that you can view them together. The files don't need to be in same data format. It is extremely helpful when you want to compare your data sets to make sure everything works correctly. The app provides unzip function. It can automatically unzip files (in .zip format) and load 3D data in it. The app also provides you strong 3D data exporting capability. You can export 3D model in STL, DAE, DXF, OBJ, VRML, PLY, OFF and ATD formats. The app is very powerful and super easy to use. It is very fast and capable of loading huge models as big as 200MB. It is a great tool for viewing, reviewing and collaborating on 3D assets. The app is part of ATView3D 3D visualization tool family developed by Afanche Technologies. ATView3D 3D visualization apps are widely used by professionals all over the world. If you need 3D viewer for other formats, please search 'Afanche' or 'ATView3D' to find more 3D apps. Afanche Technologies is a company specialized in 3D technologies. For more info, please visit our website http://www.afanche.com.