The FME i3s writer to output SLPK files is working great - but it only includes textures that can be displayed in ArcGIS Pro:
Once uploading and publishing the SLPK to AGOL or ArcGIS Enterprise, the web scene does not display any textures.
With the workaround to output the read 3D data as multipatch feature classes to a (scratch) gdb to be picked up from there in ArcGIS Pro, it would be way nicer to have the option to write SLPK-files with some texturing options like here: https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/create-3d-object-scene-layer-package.htm
