I am trying to use a projected texture on top of a box using the ProjectedTextureUtil class. This works fine by itself. But when I show a user interface on top of the scene using FengGUI, the GUI loses all of its text. It almost looks as if it uses a random texture for the text instead of the one it is supposed to be using. In desperation I tried to update the FengGUI to the latest version, but that did not even have support for setting the font texture anymore.
you could try the solution from this thread -> Display Problems with FengGui or FengGUI inherits texture transformations.
There are a few things to take care of when working with 3rd party libraries like FengGUI.