Check Coordinate Conversion for ARTIST Export

In ``CANVAS`` we use the default three.js coordinate system, i.e.the y-axis points up. This results in the mappings:
- x -> N
- y-> U
- z -> E

We need to make sure that these mappings are handled consistently when exporting ``CANVAS`` scenarios to ``ARTIST``.

No file or test is named. Locate the CANVAS-to-ARTIST scenario export entry point, then trace how the three.js x, y, and z axes are converted to ARTIST's N, U, and E axes. Done means the mappings are applied consistently throughout exported scenarios and the relevant export behavior is verified.

Written by the indexing model from the issue text.