Photogrammetry LOD's and optimization


We’ve made a drone-based photogrammetry scan of a residential area, and I’m currently investigating methods for making the resulting model run in VR. We’re using Realitycapture, the mesh is about 1.5 mil triangles, and the texture is an 8k color map.

Are there tools either in Unreal or elsewhere that can segment the model into a grid and generate LOD’s for each piece? Are there other techniques I don’t know about? I’ve looked into Meshlab and Simplygon, but I haven’t gotten very far.

Also, if anyone is familiar with point clouds, I’m wondering how to render them in VR, in case that’s an easier approach than geometry. See post here.