Questions about 3d model tracking

Questions about 3d model tracking

Hello,

I'm learning to use the metavision_model_3d_tracking program. Because the 3d model should be in JSON format, I have questions about this data format.

The program needs an "object_init_pose.json" file and an "object.json" file. However, if I convert my .stl file into .json directly, this .json file cannot be loaded correctly. The error shows: RuntimeError: No such node (vertices). Then I moved the vertices term out and let it be at the same level as the root node, then there are more errors such as "bad allocation" and "RuntimeError: conversion of data to type "float" failed" 

So I wonder, if there's any tutorial concerning the JSON files in this 3d tracking example, and what does a correct json file look like for both object.json and object_init_pose.json? 

Thank you very much!
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