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FSX jetways with transparent windows

I know that transparent have often discussed here, but this time I found the transparent collided with transparent. :confused:

I search in the forum and tried to research with trial and error but no luck even I separate with different bgl.

the problem is "the transparent double sided"

this is my model, using a plane to separate windows jetways with grey alpha.

I set Alpha Test value: 175, this is the result, correct from both side.

I change Alpha Test value: 52, I can see the grey alpha, but can't see the jetways inside on another side. only a box made with succeed.

I see on another side, the aircraft is transparent, and the prev box is error, but another box is correct.

the setting:

the jetways should be like in pic 2, but with grey windows.


Resource contributor
I'm sorry that I don't know the solution on this either. I think if I had this problem and I cannot solve this, I'll use the V shape beam as a true polygon and separate the glass as another transparent material like the glass of cockpit (see the aircraft sdk) this might help. I had the sme problem in WMKK project. But I still didn't try that idea.
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try Alpha Test Level value between 70 and 80
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