Supported platform: Windows and Mac OS
Supported release(s): AutoCAD 2021
The implementation of the AcDbBody, AcDb3dSolid, and other 3D modeler related classes are now stored in the AcGeomentObj.dbx module. If you need to use any of the 3D modeler related classes in your custom applications, you will want to make sure the AcGeomentObj.dbx module is loaded. This shouldn't be a problem with applications that are executed within an AutoCAD-based product, but applications developed with the RealDWG SDK will need to explicitly load the module
// Load AcGeomentObj.dbx for ASM entity support acrxLoadModule(L"AcGeomentObj.dbx", false);