Loading a big 3D model at runtime

Hey everyone,

As a part of my research project, I need to download the 3D model from my web server, which is output of a photogrammetry software, so these models are huge(as big as 1.4 million vertices in the mesh). After downloading the model using this asset, I am not able to render it at runtime due to number of vertices in it as Unity does not load anything more than 65536 vertices for a mesh.

However, when I try to render the same model in Unity Editor, Unity is making 22 groups of the model(with 65532 vertices in each) and then it loads smoothly without any problem on HoloLens.

So only option(unless I am missing something) is either to break the model into multiple groups of vertices not more than 65536 each, before saving it onto server or break the model into meshes at runtime.

Can you recommend or point me into direction of achieving this?