Inverted Normals - No reflections ?

[THExDUKE]

Hey there,

I posted this already on cgtalk, but I did get the tip to post my question here.

My issue is that I often have to deal with CAD Data and I need to come up very quick with some results. Most of the time I don´t have enough time to make the Mesh clean so I work with what I get.
It often happens that the Nurbs surfaces come with different normals directions. So some surfaces are looking in correct direction some are not. This unfortunately makes problems, since for Nurbs, there
are limited modifications or tools especially for surface direction. The problem I have is that, if I render the geometry, reflections are ignored on the inverted pieces. That does not only come up on Nurbs,
this also is on polymodels.
First I thought the doublesided feature should take care of this but unfortunately it did not. I created a little test scene to demonstrate the difference between mental ray and vray and the little option on the
mia_material_x that helped me to ignore this reflection problem.

You can take a look on the post and screenshots here.

Cgbeige aka Dave Girard recommended to post here and ask Vlado here about that.
Would be glad about any help on this.

Thanks in advance

Duke

[vlado]

I haven't looked at the cgtalk thread, but there is an option in the VRayMtl material "Reflect on back side", make sure it is enabled.

Best regards,
Vlado

[THExDUKE]

Thanks a lot Vlado. A very emberassing point that I missed that attribute. That did solve my issue. Thanks a lot.