World UVs?

[Sybaris]

Hi everybody,

I am working on this building at the moment:

As you can see it has a zinc roof with folds every 50cm.

The first thing is that I would need UVs that always have the same scale, inpendendently of the size of the face - "world UVS" so to speak. I've written myself a routine under Unity to do exactly that - it shouldn't be too difficult under Houdini. This pic shows that the lanes are wider on the left part and more narrow on the right part - obviously because the texture is scaled to fit the size of the face:

Is there a way to project world UVs to the faces?

The other thing is that the normal map actually has a "raised" fold, being white on the height map:

I'm converting this height map via a gradient to a normal map. That seems to work but as you can see from the pic before, it looks as if the folds were lowered. Even if I invert the original height map and convert this, it doesn't make much difference.

So, what am I doing wrong?

Best regards and thanks in advance,

G.