Hello!
Very glad to see an update to the IGS exporter for Blender. I was able to get the old version working for all my projects, save one: viewer-facing flora.
And now it appears I am having the same trouble with the new IGS exporter. I love how it sets the viewer facing value according to the shader you select. In my case, it's the TrUpVFaceFlora shader, which sets the viewer facing property to "2".
This causes the blueprint editor to crash with the attached error. If I change the shader in slot 1 to something more basic, like TrDiff, the export works, but the resulting geometry is then incorrect. I am testing a single plane mesh with an image texture in slot 2.
Any clues? I have been able to export pretty much anythings else, including animations. The tool totally rocks!
Thanks much!
130131 ExportError.jpg