offset

app.py

@@ -609,9 +609,8 @@ async def generate_i3s(request: GenerateRequest):
         enc_options = {
             'sceneType':               'Global',
             'sceneWkid':               '3857',
-            # Shift local ENU origin to the real-world 3857 position.
-            # CGA axes: X=east, Y=up, Z=south → globalOffset = [3857_X, 0, -3857_Y]
-            'globalOffset':            [cx_3857, 0.0, -cy_3857],
+            # globalOffset is in the output CRS (EPSG:3857): [x_easting, y_northing, z_height]
+            'globalOffset':            [cx_3857, cy_3857, 0.0],
             'baseName':                slpk_name,
             'writePackage':            False,    # unzipped folder; fallback extracts .slpk if unsupported
             'layerTextureEncoding':    ['2'],