ProceduralTerrain | Procedural voxel terrain generation in Unity | Game Engine library

I am working on an arcade style Everest Flight Simulator.

In my debugger where I am building this, I have a terrain and helicopter class which generate the BufferGeometry terrain mesh, the Groups for the helipad Geometries, and the group for the helicopter Camera and Geometry.

My issue is that currently I can't seem to get any collision to detect. I imagine it may not support BufferGeometries so that is an issue for me because I need the terrain to be a Buffer since it's far too expansive... as a standard geometry it causes a memory crash in the browser.

However, testing the helipad geometries alone it still does not trigger. They are in a group so I add the groups to a global window array and set the collision check to be recursive but to no avail.

Ultimately, I am open to other forms of collision detection and may need two types as I have to use buffer geometries. Any ideas on how to fix this or a better solution?

The Helicopter Object Itself