Yes, I want this one : you can write I3S data but you can't read it.

Want? very much so :)

YES. I want very much :)

I'd also like an SLPK reader. I know that there have been comments stating that SLPK is a presentation format, but I perform quality control on the SLPK files and need to ensure that the SLPK is suitable for our customers who purchase the SLPK. It's essential for me to check everything in final product and not the source data. So I need a reader that will then allow me to add transformers that can check coordinate systems, resolution, colour ranges, elevation etc. This is a lot easier if I can automate it rather than doing it manually.

I really would like to echo how useful this would be.

Whilst SLPK is merely a convenient export format for the likes of building models, it is far more critical on photogrammetric meshes, or in Esri parlance, integrated meshes. We are running into old-fashioned file format transcode roadblocks when trying to convert an I3S-SLPK (integrated mesh profile) to Cesium 3D Tiles, ideally as 3TZ. The common wisdom seem to be to run loaders.gl on a command line, but it is neither user friendly nor producing particularly good outputs. I’d far rather we be able to use FME. Photogrammetric meshes in general are somewhat lacking in terms of file formats that can be used as a pivot, and our business lacks the capability to go back to the original Bentley or Skyline project files.