Iray shader brick "Animation Time"

emu42

I was pretty excited when I found this Animation Time brick in the Shader Mixer the other day. Finally a way to animate shaders!!! Woohoo! Well... or so I thought. Actually all it ever seems to do is output the value 0 (float). Yes, even in any frame beyond 0. I would have expected it to contain either the time in seconds or milliseconds or the frame number or whatever. Does anyone have any idea what this brick is supposed to do or how to make it work?