"convert shaders to Arnold" does not work!

[marbei]

Arnold version: MtoA 4.2.1 on Maya 2022
My OS environment is Windows 10 Pro 21H1.

I am working on city scene by geometry data Plateau by Japanese government 3D urban model data set.
Importing fbx file into Maya, shader is phong. Then I want to switch to Arnold.

Becaue data set contains many shaders, I tried Arnold function - "convert shaders to Arnold" (Arnold - Shader - convert shaders to Arnold.)

After a few minutes it seemed successful to switch to Arnold, but actually there is a problem.
All texture does not appear at all.All building is black.


Then I picked one shader and add another ai stardard shader and connected these nodes.
So as you see it in pictures attached, result is what I need.

My question is what causes this problem and why function of converting does not work.

Any advices are very welcome.

Thank you so much for your reading and concern in advance!

[Stephen.Blair]

Turn off Use Default Color in the File node.

Did you check the Arnold log (with verbosity level = Info) ?

Disconnect the texture and try with a plain color. Does that work?

[lee_griggs]

Try changing coat_weight to 0.

[marbei]

Thank you Stephen and Lee. I appreciate your quick answering.
After changing coat value from 1 to 0, it works.

I thought "converting shader to arnold" batch work gives coat value with 0 like adding default aistandardshader coat value. I did not notice it.

Many thanks!

Following pictures: top - original phong shader. mid - convert to arnold shader, bottom - changing coat value 1 to 0.