Extremely high difficulty to create new IBLs per documented process

[cdata]

For context, I have been trying for a few weeks now (in fits and starts) to incorporate the glTF Sample Viewer into a testing suite that I maintain. I have run into a number of bumps trying to incorporate a custom IBL to the project.

• It is currently not possible to configure custom lighting for the viewer without source changes Configuring custom IBLs #252
• The pbr-next branch does not work when built from source; KTX2 files are apparently created with an unexpected version, so models are not lit (see below)
• Building the glTF-IBL-Sampler for pre-filtering IBLs is really hard on OSX; I was not able to do it without making source code modifications
• It is not possible to correctly pre-filter IBLs using the prescribed tools when building this project from master because the IBL Sampler produces artifacts suitable for the pbr-next branch (KTX2) and not master (HDR cube maps)

Probably the hardest part has been the shifting nature of the implementation for all the projects. At times I had cobbled together a working collection of projects only to find changes come down that broke everything.

Would it be possible for this project to ensure that master is always in a working state, with documentation that corresponds to what is found on master (or some kind of designated stable release) in all dependent projects?

Unlit model	Related error

[UX3D-nopper]

Thank you for the feedback. I created several tickets:

• It is currently not possible to configure custom lighting for the viewer without source changes Configuring custom IBLs #252
• The pbr-next branch does not work when built from source; KTX2 files are apparently created with an unexpected version, so models are not lit (see below) MIME update KTX-Specification#18
  At this point of time, there is no official KTX2 mime type.
• Building the glTF-IBL-Sampler for pre-filtering IBLs is really hard on OSX; I was not able to do it without making source code modifications glTF IBL Sampler can not be used on MacOS X glTF-IBL-Sampler#12
  I made a quick fix for the latest Vulkan SDK and will let it cross check.
• It is not possible to correctly pre-filter IBLs using the prescribed tools when building this project from master because the IBL Sampler produces artifacts suitable for the pbr-next branch (KTX2) and not master (HDR cube maps)
  To avoid confusion, everything is now in the master branch.

I am closing this ticket, as sub tickets were created. Please create for every bug a new issue.