Opacity output from substance painter does not work properly

Exported textures from substance painter.

I tried connecting them in the same way by referring to the video.
I am not getting the desired results.

I want to make only the window transparent, but all the objects are transparent.

Is the connection wrong?

You’ve plugged RGBA in opacity instead of A.

Thank you for your comment

I tried connecting A to opacity.
The parts that I don’t want to be transparent, like the image, become transparent

Debug your alpha channel. Open the texture in texture editor (double click the texture in content browser) and have a look at the alpha channel.

The part of the roof that was transparent earlier,

Here it is displayed without problems

You need to view only the alpha channel. Check the image I posted earlier. Untick R,G,B

I think it’s probably okay

What if you plug a Ceil node between A channel and Opacity input?

Seems like no change

The transparent part changes depending on the viewpoint of the camera.

Looking at the ladder from the side
It is not transparent,
Transparent when viewed from the front

I think there is a problem with normals. Did you model it yourself? If you want and can you could attach the mesh. I could check it out.

The model made with maya was exported to fbx.

If you check the normal of the ladder, there seems to be no problem

I’m experiencing same problem. any solution?

Ideally any transparent parts of a large mesh like this should be broken up into separate materials. Translucent materials are lower quality and more expensive so should be limited to as small of an area as possible.