A Translucent PolyObject has One Less-Translucent Line

[SPZ1]

I've noticed something working with PolyObjects and Translucency: One line will remain less-translucent. In this demo I have created, this appears on the red texture side.

[SPZ1]

I wanted to point out that this is still happening. I made a new picture where you can see that two lines of the polyobject are irregularly brightened instead of just one.

[Kappes Buur]

It seems that the placement of the startline(s) is very sensive to how the polys are drawn. I tried many combinations, single lines, diagonal lines and finally came up with those 3 startlines

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Give this one a try, I ran the pwad with most of the recent versions of GZDoom, with no ill effects showing

[SPZ1]

I also found that adding 4 lines to the center resolved the 2 line transparency issue from the picture. Unfortunately, it also induced a bug where other transparent things have these "ripples" from poly lines going through them. Most notably would be the hedges in front of the house. I made a short video: