I have a 2D texture object that is scrolling across the screen. It is has windows in the image, and I need those to be transparent and show what is behind it.
I’ve set it to alpha is transparent, and tried many other things.
It’s also set to repeat and it is scrolling correctly, just the windows are becoming solid.
You need to set the shader to transparent mode (if using the standard shader; or if using the older shaders, then pick a transparent one).
I have tried that as well. To no avail.
Then it sounds like the window areas in your texture are not actually transparent (in the alpha channel of the texture image itself).
You might want to double check your source texture, sometimes the alpha channel can get lost in export. Make sure it is imported with an active alpha channel, and using a shader with transparency should work.