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Blender is a great choice! 2.8 beta includes glTF export
v2.79 and earlier can use this plugin: https://github.com/KhronosGroup/glTF-Blender-IO
For anything else try this converter: https://blackthread.io/gltf-converter/

Ok I will have to check that out, I haven't done any 3d stuff for a few months now 😆

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