Problem with dobble sided polygon - help please

[JML]

somebody here modelled pieces of glass of an interior as flat polygons from
another modelling program.

look at the picture for a better understanding..

when imported, the polygons modelled seems to be double sided in layout.
but in the surface editor, the surface is not double sided.

I modelled 2 faces directly from LW and they act the way they are supposed to.
(when you look 'behind' them , you can't see them)

(all surface in this scene are the same)

my question,
I remember that there was a tool to make single polygon dobble sided in modeller,
(not through the surface but thourgh the polygon itself) I don't remember where it is if it's still there,

is there anyway to convert those single polygon back into 'real' single polygon

[Macet01]

Are you sure that they are all single polys. I did this once and while they looked like single polys they were actually two polys with opposite facing normals existing in the same coordinate space.

[JML]

no they are single poly (I selected them and there is only 1 poly.

that's okay thought.. not a big problem,
we usually import glass as object and it works fine.

but somebody modeled those piece of glass as 1 poly object and I guess while the convertiing, something got messed up.. that's okay, next time, I will tell them to model as objects instead of faces..

[Silkrooster]

You can have two polys facing opposite directions and merged together, which would make it a single poly. Using the unify tool would make those polys single sided again. Then it maybe necessary to use align tool to make them all facing the same direction.
Silk

[Surrealist.]

my question,
I remember that there was a tool to make single polygon dobble sided in modeller,
(not through the surface but thourgh the polygon itself) I don't remember where it is if it's still there,

is there anyway to convert those single polygon back into 'real' single polygon

If you have LW 8 both are in the Detail Tab/Polygons/More...Double Sided and Unify Polys, the later of which Silk corectly pointed out will solve it.

[JML]

thanks , I will try that.