world space normals flipped problem

[NOSIDE_SARL]

Hi everyone,

I'm having a problem with outputing correct normals with the extratex technique.

The thing is : I have a lot of proxies in my scene, some of them have flipped normals.

It would be too long for me to re-do the proxies with correct normals...

The double sided option of the VRay Dirt works fine (so I can render correct Occlusion pass)

But when it comes to normals, I tried several techniques, without success.

It is possible to output correct normalWorld pass even if I have flipped normals ?

thanks