Autodesk 12812-051462-9011 User Guide 3 - Page 1969

that will be repeatedly translated in and out of different formats through IGES. By becoming familiar with the details of the systems and the IGES translators you use, you can learn to structure files to minimize information loss. WARNING The conversion of objects during translation is not fully symmetrical. If you import an IGES file that you created by exporting to IGES, the resulting objects might not be identical to the original. NURBS When you import an IGES file into the software, IGES meshes are converted to NURBS on page 2237 surfaces, rather than to 3ds Max mesh objects. An IGES file with multiple meshes imports as a single NURBS model. Each IGES mesh is a surface sub-object within the model. Each surface sub-object based on an IGES mesh is initially a rigid surface on page 2257. To edit the surface and its CVs on page 7946, you must first make the rigid surface independent. The following procedure explains how to do this. Future Compatibility The group that maintains and updates the IGES standard, the IGES/PDES (Product Data Exchange Standard) consortium, attempts to keep IGES upwardly compatible. It's likely that files generated by the software will be compatible with future versions of IGES. See also: ■ 3ds Max to IGES Export Table on page 7231 ■ Exporting IGES Files on page 7230 ■ IGES Log Files on page 7225 ■ IGES to 3ds Max Import Table on page 7228 ■ Importing IGES Files on page 7226 Procedures To make rigid imported NURBS surfaces independent: 1 Select the object. 7224 | Chapter 23 Managing Scenes and Projects