If the mesh has more than 65536 vertices it’s rendered wrong in the Native Viewer.
bgfx supports 32-bit indices just fine 
In babylon.max.js I suggest to change:
uintIndices: true,//false,
Kind regards,
Michael
Pinging @bghgary
As mentioned in the original thread, I was hoping you can submit a pull request. 
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Ups sorry, wrong kind of request …