If the command is not recognized in your AutoCAD based application, and if you have AutoCAD MEP, you can possibly install the enabler for your application over AutoCAD MEP to bring in the objects properly converted. If your AutoCAD application, such as AutoCAD MEP, has the IFCEXPORT command, you should be able to export to the IFC format, which is the recommended format to bring your model into SMC. Unfortunately, with some applications installed over AutoCAD, the ConvertTo3DSolids doesn’t recognize some objects as AEC objects, which doesn’t allow the geometry to convert to be read in SMC correctly. When saving the file, select “Files of type” as “AutoCAD 2013/LT2013 Drawing (*.dwg), since SMC doesn’t currently support the AutoCAD 2018 format.Try saving to a NEW DWG as this one is just for use in SMC, and you don’t want to overwrite the actual one you are working from.It may ask to erase selected objects, if so type yes, as otherwise there will be two versions of the objects, the converted and the ones that come in incorrectly.Type Convertto3DSolids at the command line.Select everything in the model (command: AI_SELALL). The same method appears to work for custom AutoCAD MEP objects when opening the resulting DWG file in SMC. The second section in the article describes a workaround for converting custom objects via the Convertto3DSolids command to bring into Revit. There is no way to install object enablers over SMC, so if your AutoCAD-based application creates custom AEC objects, they have to be converted to solids in the exported DWG in order for the geometry to appear correctly in SMC. Solibri Model Checker (SMC) supports the DWG format from AutoCAD however, it is always suggested to export to the IFC file format for the best results in SMC.
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