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I want to add 3D models into PowerPoint presentation using OpenXML. When I add 3D models in GLB format, into an empty presentation, and then extract its XML contents, I can see so many parameters which are started with am3d tags, and one of them is meterPerModelUnit:

<am3d:meterPerModelUnit n="8069447" d="1000000"/>

When I increase this number (and save and zip again) the model will be zoomed in and when I decrease it the model will be zoomed out. Also when I reset the model the value will be reset automatically to this constant number for my specific model.

According to microsoft office model 3d schema, this is the scaling factor used in GLB file but I couldn't figure out the mathematics behind this ratio calculation in 3D Models and/or PowerPoint 3D Engine. Does anyone know how the meterPerModelUnit parameter is calculated when the model is inserted in PowerPoint?!

Ali Safe
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  • You might be able to get an answer asking Microsoft directly here: https://learn.microsoft.com/en-us/answers/topics/openspecs-office-fileformats.html – Todd Main Dec 16 '21 at 20:07
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    Hey Todd thanks for your reply, it was very helpful. For anyone who wants to know the answer, take a look at here: https://learn.microsoft.com/en-us/answers/questions/668824/how-powerpoint-3d-engine-calculate-scaling-factor.html – Ali Safe Feb 19 '22 at 16:54

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