I'll check with the rest of the team on the unit issue.

When you import a model, the entities (edges, faces, groups,... ) don't go directly in model.entities. They are encapsulated in a new component....

You can only access the Materials that are loaded into the Model. You can iterate the list and get various aspects of the material. Sketchup.active_model.materials.each{|material| puts material.name puts material.display_name puts material.color puts material.alpha puts material.texture ### and so on... puts } I have included the puts so the info is shown in the Ruby Console but of course you can do other things with that... A Material's '.display_name' is not always the same as the '.name' [depends on its creation/source] A Texture can also be further probed to get info like its image, size and so on... Read the API http://www.sketchup.com/intl/en/developer/docs/classes.php If you must get details of SKM files not yet loaded [and not loadable using native API methods] then you could look at my SKMtools which offer many additional tools to import/export/interrogate SKM files etc... But please learn to walk before you run

Thank you sir.