How to add variable to Vray Image File Node Path?

V-Ray V-Ray for Houdini General
1

Hi, Is there any way to add variable in the file path of the Image Vray Node? I can’t find a way to pass my param variable into my Bitmap Filepath…
Any idea?

Thx

Capture1.PNG
Capture1.PNG943×552 53 KB

Capture2.PNG
Capture2.PNG943×424 35.8 KB

2

Hi @creac ,

You can use channel expressions anywhere in the file path or switch between different textures using a switch node.

Check the file I attached. There I linked several drop-down lists and a toggle to come shader nodes, switches and in the image node paths, and it shows several approaches on how to deal with this.
a
Best,
David.
channelExpressions.rar (25.5 KB)

3

Hi @david.anastacio ,
Thanks for the file. I am trying to switch between paths actually. Switch node inside the Shader means that I would have to input manually into the switch node, which is ok for a few but I have a lot so it’s quite laborious.
Ideally I am looking to an expression for the path of the Image node similar to this “${HIP}/TexturesToTest/DiffuseMap{var}” where my var parameter is promoted to the Shader node. By doing this I don’t have to type all my paths. Just switch between value to update my path.

4

Hey,

Sure, just use a string parameter instead of a drop-down menu and link it the same way, through a channel string expression like in the image nodes of the file I uploaded.

best,
David.

5

Ok I see now ..Thanks for your help!