The problem is “print” node in Mat could not return the value(the console will not pop up).

Here I have 2 files which have exactly the same nodes.

The file A is from the Internet where other people use “print” node and it works well. I delete all his nodes and create some other nodes to make things easier to understand.
The “print” node could return the right value in console while rendering.

So I create a file B and do exactly the same thing. But the console just won't pop up when I start render.

By the way, the console will not pop up either if I use non-commercial houdini to open file A.

I really have no idea about why that happens.

Thanks for any clue.

Your B.hip works fine for me with Indie 17.5.173 on w10

-b

bonsak
Your B.hip works fine for me with Indie 17.5.173 on w10

-b

well…guess that means it's just a problem with my computer or software version T T