I have UK data in "WGS84 - EPSG 4326" however when I import it into CityEngine it puts it in "WGS 1984 UTM Zone 30N EPSG:32630".
This is OK for vector data but raster data imports somewhere many miles away. I have converted the raster into EPSG:32630 using qGIS but it doesn't help at all - it seems to import into the same position as before but is now a bit squashed. How do I get things to line up like they do when I view them in qGIS.
I'm not sure about this precise projection. There's some (rare) ones which are not supported indeed, but I'm not sure if it's possible to create such a list.
Thus I usually recommend to use the default UTM projection.
I got it to work but it's not ideal - I have to reproject it, then note down the xy coords and dimensions so I can position it in CE. There is a slight rotation applied in the reprojection so I get some zero values around the edges of the bounding rectangle - this makes me think I will not get a clean reprojection back into EPSG4326 after export if I have altered the terrain (but I haven't tested this yet).