`Emission` materials not exporting, throwing Traceback

I’ve been testing the IO exporter with certain materials/shaders, and I’ve run into issues with the Emission shader.

I’m using the latest Blender 2.8 Beta and have tried the following node configurations with no luck:

Errors:

I’m relatively new to material/shader node configurations in Blender, but from what I’ve seen, I was under the impression that at least one of the above would work with the IO exporter. If not, please let me know what I’m doing wrong so I can test properly.

Thanks and keep up the great work!

[UX3D-nopper]

Fixed here: https://github.com/KhronosGroup/glTF-Blender-IO/commit/50654eaf0cb62889cab711762f1b5355f2776b1c

Following node setup export is now working again:

[dsinni]

Thanks, @emackey!

So, just for clarification:

• A Separate RGB node should not be needed in order to export Metallic/Roughness.
• Using an image editor such as GIMP or Photoshop should no longer be required to combine the RGB of the ORM texture as this will be done automatically by the exporter.

Is this correct?

EDIT: Sorry, it seems we went off on a tangent from the main issue, but Metallic/Roughness appears to be working in the latest Blender build! (Look, Ma! No image editor!) So I’m thinking my questions have been answered.

In addition to @donmccurdy’s point, users may also keep around a few different variations of the shader(s) with different settings disconnected in the same node graph. I sometimes do this when I find a combination I like, but still want to experiment, so it may not be all that extraordinary.

It’s possible that the connected shader would completely override the disconnected; I haven’t tested that yet, but I’d imagine it’s better to rule it out by limiting to what is actually connected.