Calculating Frustum Volume - New Toposolid tool

[Daniel_Hinks]

I've been testing out the new toposolid function in Revit 2024 to see if it's possible to calculate how much ground we have above our clearance envelope (hatched in green on image attached) compared to the amount the empty portion (hatched in red on image attached). I've been able to cut out the green portion from the toposolid using a mass object and compare the volume before/after to identify the volume, and could perhaps add points to the surface for the region above it, but this solution isn't perhaps as straightforward as I was hoping for.

Does anyone have any similar workflows/ideas? I have an inkling Civil 3D may be a more suitable tool for this exercise but wanted to test in Revit first.

[L.Maas]

I am not familiar with the new toposolids. But the earlier toposurfaces where not that accurate. So depending on accuracy required, Civil might be the better way to go.

I probably would try to use Dynamo. Dynamo can turn Revit elements into geometry and can do operations on them (like intersection). So in concept something like this:
-Turn toposolid in to (Dynamo) geometry
-Create another geometry object (e.g big box) at your desired height
-Do boolean operations like intersection
-Calculate volumes of the created/intersected geometry
-Store values in parameter somewhere in your project
Or
-Convert the geometry to revit elements and use them in Revit.