I have a problem with png images, have a weird black border, I tried with alphaTest and the border disappears but was pixeled.
in this video, I show where is the border.
https://drive.google.com/file/d/1Qkk7b1O2cUAFHlDh0x3074LgvCrl5HEj/view
you can find my code and images to have an idea here
https://github.com/Deboracgs/proj16
I don’t have any idea to fix that, and the problem isn’t on image 
I just tried it locally and I don’t see the black lines
Here is a codesandbox link
The glass dark border is from the reflection of the wall
compare against the more orange background
compare against the default
I think this looks really good.
I see it now, when you zoom right in
Default
After changing image
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If I do this with your code it is better at the bottom of the glass, but the top of the glass becomes pixelated. So I don’t know best answer for this.
Top
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it is good for now, thank you!
