GLB export broken under NullEngine in v9 - root cause and fix

[Arek3D]

I’m pretty sure I was using version 8.33 in a Node.js application, where GLB export with textures was working fine. However, USDZ export was throwing an error (readPixels did not work on NullEngine).

I created a topic about it here:

Server-Side USDZ Export Support in Babylon.js?

Hi, I’m wondering if there are any plans to make the USDZ exporter in Babylon.js work in a server-side / Node.js environment. The GLB exporter can be adapted to run outside the browser using NullEngine and Node.js, but the USDZ exporter seems to be much more tightly coupled to WebGL and the canvas context - specifically the “bitmaprenderer” mode used inside: ”@babylonjs/core/Misc/dumpTools.js” Which causes this error: ”USDZ export failed: Error: DumpData: No WebGL or bitmap rendering con…

Based on the feedback I received from you, I made a fork and submitted a PR to add USDZ support. That was done on version 9, and it worked correctly for USDZ files.

After upgrading my Node.js project to Babylon.js v9, I noticed that GLB export no longer works. I’m now getting the same readPixels error that previously only occurred with the USDZ exporter in v8.33.

Has something changed in v9 regarding gltf exporter that could affect this function?