shapes and terrain y and z are inverted

[MaximeDemers]

Hi,

I have a weird behaviour in CityEngine 2022. It seems the y and z are inverted somehow. The scene coordinates system is EPSG 3857 just like the layers and terrain.

For instance if I use python to get the position of a selected shape I got this:

You can see the z is the second argument and the y is the third of the ce.getPosition() returned sequence.

Moreover the y (-5677497.278076172) should be positive (north hemisphere),  not negative.

Except the python, everything seems to work correctly in CityEngine. If I export models in multipatch and open it in ArcGIS Pro the layer is correctly positionned.

What is the cause? How can I correct that situation?

Thank you!

Maxime Demers

[DanPatterson]

does anything change when you get the coordinates of the first seletion

ce.getPosition(ce.selection()[0]

from

CE—ArcGIS CityEngine Resources | Documentation

[MaximeDemers]

No it's the same result

[MaximeDemers]

up please!

[DanPatterson]

Tech Support would be your best option given no one else is weighing in.  It may be reported in an internal bug list

[MaximeDemers]

Ok thanks for your reply!

Can you confirm that on your side the y and z are not inverted like me?

I would like to be sure that it's not a normal behaviour of CityEngine before opening a ticket.

[JonasObertuefer · Accepted solution]

Hi @MaximeDemers,

At first glance I don't see anything wrong in your python console screenshot. If everything is correct when you export it to Pro, what are the x,y,z values there?

Please note: ce.getPosition returns [x, y, z] where y is the height value. This is how coordinates are handled everywhere in CityEngine.

Best,
Jonas

[MaximeDemers]

Thank you for confirming that the y is the elevation in CityEngine!

I am not sure why the z (latitude) is negative in CityEngine but positive in the coordinates system. My data is in the north hemisphere.

Anyway, everything seems to work so I dont worry.

Thanks again!