Arnold doesn't export mtlx

[eguquan]

htoa 6.1.4.2  arnold 7.1.4.2

arnold_materialbuilder can use houdini node parameter, but material.materialExport has error

Traceback (most recent call last):

File "<console>", line 1, in <module>

File "/ARNOLDPATH/arnold6.1.4.2/scripts/python/htoa/material.py", line 165, in materialExport

shader_dict.update(material.generateMaterial(volumic=False))

File "/ARNOLDPATH/arnold6.1.4.2/scripts/python/htoa/material.py", line 782, in generateMaterial

return self.generateSurfaceShader()

File "/ARNOLDPATH/arnold6.1.4.2/scripts/python/htoa/material.py", line 806, in generateSurfaceShader

shader = self.generateVop(surface_vop)

File "/ARNOLDPATH/arnold6.1.4.2/scripts/python/htoa/material.py", line 1288, in generateVop

input_anode = self.generateVop(input_vop) # recurse

File "/ARNOLDPATH/arnold6.1.4.2/scripts/python/htoa/material.py", line 1288, in generateVop

input_anode = self.generateVop(input_vop) # recurse

File "/ARNOLDPATH/arnold6.1.4.2/scripts/python/htoa/material.py", line 1233, in generateVop

value = houdiniParmGet[arnold_type](creator, houdini_name, self.session.frame)

File "/ARNOLDPATH/arnold6.1.4.2/scripts/python/htoa/node/node.py", line 242, in <lambda>

AI_TYPE_RGB : lambda n, x, f: n.parmTuple(x).evalAsFloatsAtFrame(f),

AttributeError: 'NoneType' object has no attribute 'evalAsFloatsAtFrame'

How can i fix this error?

[Stephen.Blair]

The HtoA export to mtlx is for exporting Arnold nodes to mtlx, I wouldn't expect it to work with non-Arnold nodes.

[eguquan]

Sure HtoA isn't expected to work with non-Arnold nodes. For what I mean is that a user shouldn't be able to choose non-Arnold nodes "in" arnold_materialbuilder. Can I remove the "Parameter" node from "arnold_materialbuilder" by myself via some sort of settings? Or, do I need to wait for Houdini and/or Arnold to solve this officially?