Allplan
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Check to see if you are using Allplan 2008 or an earlier version (Allplan 2005 or 2006).
These program versions use the Allplan XML format for exporting files. Some export options are no longer required when using Allplan 2008.
Allplan uses a new, optimized method for exchanging files and can read the native Cinema 4D file format.
This can be done in one of two ways:
If this option is not enabled, Allplan will display an error message, stating that it was not able to read some objects.
If this occurs, select main menu: File / Import / Import Cinema 4D files.
Allplan 2008 (or newer) offers several new functions, e.g., substantial amounts of geometry can be imported with no polygon limit.
Details regarding working with materials (replacing, exchanging, etc.) in Cinema 4D can be found here.