How to render in invert polygon?

[pomme]

I checked the render option and notice that XSI set as default that they will render all the objects in both sides.

Which is good. because a lot of my geometry are needed tobe render in that way.

However, i am creating an admisvior by getting a big sphere. I would like to invert the polygon of the sphere so that it face in.

I don't know how to get that render only the inverted polygons by keeping the render settings render as both faces.

[pnoizat2]

use the switch front/back node in the render tree.
that way you can differetiate what happens to each face.

excellent

[pomme]

how do i position the node?

i just turn everything red when i add it in between.....

....don't know how to use it, can you show me please???

[pnoizat2]

it allows you turn treat each face differently.
eg:
any shader > front...__material surface node.
any shader > back../

by default front is red and back is blue or something like that. you will have been looking at red faces, thus front faces,
simple.

[atyss]

Connect into the Back input a Constant surface shader. In the Constant node, put 1.0 as Transparency. See below:

Hope this helps
Salutations - Cheers
Bernard Lebel