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