Problem with window and curtains

Hi, I have some problems with materials, I wanna see curtains where is the glass in a window but there is like opacity 0. How can I solve this problem?

And also there is something like this with glass and cakes xd

Use Sub Surface scattering

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Theres no easy solution, transparency in real time has limitation (objects needs to be sorted back to front).

If you only have additive in your scene, it’ll work fine.
When you start to use blending or refraction, issues can happen.

For the curtain you can try to make them both refractive material, or one of two dithered.
For the cake in glass, yeah, nested transparency is tricky to get right. Maybe the cake should be subsurface.

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