Maya 2020 export does not work!

[morrisolmsted]

If I use the plugin, it generates a file with either nothing in it or won't view. I tried using the cmd line...
import glTFExport
glTFExport.export(r"D:\Downloads\ZSU_Substance\ZSU_Substance\BellHeli_cmd.gltf", resource_format='bin', anim='keyed', vflip=True)
but I get this...
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C8AC50>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C8AA20>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C8A828>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C8AF28>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C8AB38>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C8ADD8>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013703C18>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013703160>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013703B00>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013CB8E48>,), {}) 0.03 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C0137034A8>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C0137030B8>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013703128>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C9B6D8>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C9B7B8>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C9BBA8>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C9B550>,), {}) 0.03 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C9B908>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C9B278>,), {}) 0.04 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013B297B8>,), {}) 0.04 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013B299E8>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013B29D30>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013B29F60>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013B29860>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013B295F8>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013B292B0>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013354908>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013354BA8>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013354E10>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013354748>,), {}) 0.03 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C0133548D0>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C0133542B0>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013354E48>,), {}) 0.02 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01349CA58>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01349CCC0>,), {}) 0.03 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01349CE80>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01349C7F0>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01349C518>,), {}) 0.06 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01349C278>,), {}) 0.03 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01349CF98>,), {}) 0.00 sec

Error: error: file D:\documents\maya\2020\scripts\glTFExport.py line 1014: pack expected 3 items for packing (got 1)

import glTFExport
glTFExport.export(r"D:\Downloads\ZSU_Substance\ZSU_Substance\BellHeli_cmd.gltf", resource_format='bin', anim='keyed', vflip=True)
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013CB8EF0>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013CB8E48>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013CB8FD0>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013CB8DA0>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013703B00>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013703908>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013703748>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013703390>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013703198>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C8AA58>,), {}) 0.03 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C8AD30>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C8A6A0>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C011C8AF98>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013C8D710>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013C8D7F0>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013C8D6A0>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013C8D588>,), {}) 0.03 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013C8D5F8>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013C8D2B0>,), {}) 0.03 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C0135397F0>,), {}) 0.04 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013539A20>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013539D68>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013539F60>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013539898>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C013539630>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C0135392E8>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01348F940>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01348FBE0>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01348FE48>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01348F780>,), {}) 0.02 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01348F908>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01348F2E8>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C01348FE80>,), {}) 0.02 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C012419A90>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C012419CF8>,), {}) 0.03 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C012419EB8>,), {}) 0.01 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C012419828>,), {}) 0.00 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C012419550>,), {}) 0.04 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C0124192B0>,), {}) 0.03 sec
'_getMeshData' ((<glTFExport.Mesh object at 0x000002C012419FD0>,), {}) 0.00 sec

Error: error: file D:\documents\maya\2020\scripts\glTFExport.py line 1014: pack expected 3 items for packing (got 1)

[pknowles]

I hit this issue too (maya 2023). The line is:

packed_data.append(struct.pack(pack_type, item))

This was hapening when exporting the positions of a mesh. I worked around the issue by Mesh -> Triangulateing the specific <mesh> that was causing the problem. I hit an identical exception with <mesh>Shape and this time Edit Mesh -> Merge seemed to help. To narrow down which it was I added a print() to ExportItem like so:

class ExportItem(object):
    def __init__(self, name=None):
        self.name = name
        print(self, name)

(I'd suggest changing the issue title to "pack expected 3 items for packing (got 1)" or something similar)