Underground building rendering.

[AllroadsNL]

In the Netherlands we have a BAG import and update. The buildings are very accurate on their position.
In this import there are buildings that are underground, like parkings etc.

example
building yes
layer -1
location underground
note Parkeergarage De Brink
ref:bag 164100000291060
source BAG
source:date 2016-09-02
start_date 2000

Can we render buildings underground different then buildings on top of it?

On the ground, their could be landuse grass and the parking underground,
How to render?

Other parking examples:
1. Should be under the grass visible, even better less visible.
2.

[HolgerJeromin]

Thanks for your input.
This is discussed already in #552

[AllroadsNL]

I did search for a moment for a topic, keyword underground, must search better next time, thanks for the link.

Now we can go on #552