Is the Orange Peel transparency effect impossible in Eevee? I have a motorcycle windshield with transparency in the alpha channel of the texture. I need the texture to be double-sided and transparent, but apparently Eevee can't handle this.

It seems to me, that if I were to take a sphere, and paint a transparent hole in it, I should be able to make it double sided and be able to look inside of the hole to see the inside.

Hence the "Orange Peel" effect I'm trying to create here. Is this not possible?

Here is the effect I'm trying to achieve. this is a screenshot from Substance Painter:



The Orange peel effect, where you can see both sides of a single solid object that has a transparency channel. Seems to me like any 3D application that supports transparency should be able to do this.

Here is what I get inside Eevee, with "show backface" checked:



And here is with "show backface" unchecked:



So my question is this: are orange peel transparency effects possible in Eevee?
You mean this kind of effect? I don't understand the relationship between orange effect and transparent issue. You might need to confirm what is your main question.



It should be work while you use Screen Space Refraction at render panel:



You will need to turn on Refraction if you want to see thing behind the glass.

And also turn on both alpha blend mode and Screen Space Refraction in your glass material:



Reference

Unable to see objects through Glass BSDF