SpatialRelator needs an upgrade to work with 3D Meshes and BREPs

Hello,

I think it's time for the SpatialRelator to get a well deserved upgrade to work with 3D surfaces and solids.

I would love to use FME for our daily BIM workflows, but get frequently frustrated because all the spatial join tools are obviously designed with 2D in mind.

8/10 of all my BIM workflows are just about 3D containers:

1. Generate container objects for rooms, grids, sectors, levels, buildings.
2. Collects all non container objects using containers.
3. Assign container ids for relations.
4. etc.

Please, dear FME gods...

1. Basically just a mesh/mesh collision test.
2. Needs a tolerance.
3. A speed/quality setting would be amazing.

I know, I can work around this by using a CenterPointReplacer with a Clipper for an inclusion test, or by reducing the problem to a 2D plane, but a mesh/mesh test is way better. So many possiblities...