Hi candidate-bill,

There are two other options. The first one is the classic way of using HDRI equirectangular images (a 360ºx180º image), just a large Sphere, normals inverted (as we look now from the inside), and perhaps the "image" needs to be mirrored, in case the shader pattern needs it.

CV4_2025_drs_24_RSoh_01.c4d
Screenshot 2024-12-03 at 10.14.21 AM.jpg

The second option is more of a little sibling of the equirectangular, whereby the HDRI image was projected and adjusted so six square images could replace the equirectangular.
This can be built with six large area lights.

CV4_2025_drs_24_RSlc_01.c4d
Screenshot 2024-12-03 at 10.00.45 AM.jpg

Perhaps one or the other helps for your project needs.

All the best