Andreas Diktyopoulos

The solution was simple enough: Update graphic card to a supported one

Ok. I found 3 solutions

1. You can use full paths and will work.

2. Lock the file node.

3. Add texture as an embedded asset via the “Extra Files” tab in “Type Properties…” window. And then you can get the texture (or any embedded asset) with:
e.x. ).

I tried to set the file as a parameter to the tools in order to expose it to the Unity editor. Again everything works in Houdini, but in Unity, I get the same warning with no luck so far.