citygml-tiler: z-axis offset not working

[sehHeiden]

I want to convert citygml with the pipline:
citygml(lod2)->3dcitydb(pg)->citygml-tiler(building).

which works with two exceptions: The resulting buildings are sometimes well above the official terrian
compared to the official tiles everything is about the hight of one to two floors to high! See image:

The second problem is , that I did want the buildings on ground level, but in a zero altitude.

I the citygml-tiler has an --offset-parameter, but that is not decribed very well. As the current eleveations are much to high.
I tired to set the parameter to ground: which results in the error, that this not of tipe u32. Which is probaly the next problem.

I did set it to -200 (moved it west and perhaps a bid south? and 200 (moved it east and a bit north, perhaps? Therefore I tried
--offset 0 --offset 0 --offset -5 as it where a list.
But that still did move everything to the west.

So please can you specify:

• how to use the parameter,
• how to set it elevation to groundlevel (or correct it)
• how to set everything to zero elevation.

[sehHeiden]

I was able to set everything to ground level and a bit of shifting with:
--offset 0.1 0.5 -3.7 the original crs was 25833 the final crs is 4978.
Everything displayed in an instace of the master portal.

Edit: I removed about a thir of the buildings and needed to correct the z-offset to be -5