Can we create a physics mesh/plane in S&box?

In gmod we have IMesh:BuildFromTriangles. Using this we can create a pseudo land generator if complimented with a Marching Cub algorithm. However, we have no option to add a physics mesh to this visual mesh.

Will we have any type of way to create a physics mesh or physics plane? Physics planes would be cool. Only has physics on one side.

Being able to build a physics mesh/plane from triangles would open up a ton of doors.

The parenting done by Layla would be impossible without it, so I’m guessing it’s already implemented.
idk what a physics plane is