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Model sizing upon tracking

I am facing a issue with the size of the models displayed on top of the markers. My models include big models like Huge buildings to small models like tv and speakers and they can have different scale factor too. Whenever I scan a marker for the building, the models shown is so huge that I have to make it smaller inside the code to fit the marker surface which is really not the solution because if I try to scan image for smaller object with same code then smaller object become more smaller and you can't see them. I am doing this all dynamically i.e uploading images through my web panel and storing model on my server then upon scan I download and display model on the marker using the metadata.

Please can anyone provide me a solution to manage the size of the models? I am stuck here.