You could also import your OBJ into Blender and then use the excellent Blender to Moi Addon which must be installed on both Blender and Moi3D. I've used it and it works fine.

Here is a thread on this must have plugin

https://moi3d.com/forum/index.php?webtag=MOI

Sorry but the above link does not seem to work. I am uncertain how you post a link to a thread here. I do not have this issue on other forums, so I posted a remark in the thread to make it current.

I hope that helps.