I think the code had the YAxis set to TMS in the working example I have. I bet moving the code to use the same GlobalMercator implementation as BruTile/Mapsui might actually help somewhat also.

I will try to add a small demo app when I get a chance. I have the rendering working properly in another codebase, but I'm not entirely sure what the difference is.

Yes, the data has the Y axis inverted. I just managed to get the tiles rendering in my NTS demo at zoom level 1:

The code to do that is in the branch I mentioned on the thread this was linked from.

Edit: I managed to make the points render correctly overlayed on a raster map:

I had a similar issue with the tiles being rendered in the wrong order and ended up doing this:

publicVectorTile?GetVectorTile(intx,inty,intz){//Define which tile you want to read. You may be able to extract the x/y/zoom info from the file path of the tile.vartileDefinition=newNetTopologySuite.IO.VectorTiles.Tiles.Tile(x,y,z).InvertY();       ....

This is obviously not to do with the AliFlux renderer, but I think it is the same issue manifesting itself here.

Fixed the inverted y-axis with a workaround

The sample show a map in the right location. There are issues which will be fixed over time. This is only sample code, no library code. I will merge it.