[Sandbox] Sample ktx file mis-displayed

[mcclure]

Repro

• Download ibl.ktx from https://github.com/bjornbytes/lovr-docs/tree/v0.16.0/examples/Lighting/PBR_Materials
• Expected: Should look something like
  
• Current result: Interpreted as a file with RGB channels all black, alpha channel all white
  

This file is the output of the Google Filament "cmgen" tool on a panoramic photo of a building.

Alternate expected behavior: After some experimentation I suspect the reason this is happening is because the file is rg11b10f [GL_R11F_G11F_B10F] and many viewers do not support this. However, if a ktx file is entered the sandbox cannot process, it should display an error message rather than an incorrect result.

Desktop (please complete the following information):

• Windows 10 Build 19045
• Chrome 110.0.5481.178 (Official Build) (64-bit)
• Video card: Geforce RTX 3070 Ti, Directx 12 runtime

Additional context
I am not a babylonJS user, I was just recommended your sandbox as a good way of viewing files such as KTX. The instructions say to only file here if you have posted on the forum first but I do not have a forum account and so due to the simplicity of the bug I did not do this. Sorry.

[sebavan]

Thanks for reporting @mcclure

[Popov72]

#13620

The PR will help bring up the error:

Note that there's also an error message which is generated in the console of the browser.

[mcclure]

Can confirm, sandbox with PR works as expected (correctly reports failure)

I notice this issue has been closed although there is an outstanding identified defect (rg11b10f textures not supported). You could consider filing a separate issue to track that. But I will leave it up to the proper users of this project to decide whether to do that…