When working with Inventor, follow these guidelines for best interoperability with Showcase:

• Autodesk Inventor constraints are transformed as Showcase behaviors. Only a single Constraint per Inventor file can be used to start a behavior. The chosen constraint must match the value specified in Showcase User Preferences, under Inventor Import Settings in the Constraint name box. To open User Preferences, click File > Preferences > User Preferences.
• In Inventor, unsuppress everything you want to see in Showcase—especially constraints.
• Make sure that all referenced items can be found by Showcase. There are two ways to do this:
  • In Showcase, click File > Preferences > User Preferences to open the User Preferences dialog box. Under Inventor Import Settings, in the Use Inventor project filebox, specify the Inventor project file. That project file is then used for all subsequent Inventor imports until changed in Preferences; or,
  • In Inventor, use the Pack and Go feature to bundle all related items together, then import the Inventor model into Showcase.
• Inventor design view representations and positional representations are supported.
• Private representations (Inventor 2011 and later), level of detail representations, and assembly level cuts are not supported in Showcase.
• Sub-assembly material overrides are not supported; in other words, if you have an assembly and override the materials in the assembly, the materials will come in to Showcase. However, if the same assembly is added to another assembly (making it a sub-assembly), those overrides will be lost.
• If you import from Inventor, change the material in Showcase, go back to Inventor and modify the geometry, and then update in Showcase, there may be issues with the updated geometry in Showcase.