Hello from Tokyo to all.
It’s been a while and getting back to using threejs.
There has been additions and updates to transmission material, I have been playing around with its many options. But I am unable to get the same effect as the one in this link.
It’s possible with the same versions of drei and threejs.
Oh! Sorry, man! I didn’t understand your problem well. English isn’t my native language, so sometimes I make mistakes Hahaha. I’m happy you found the answer!