ofMaterial and Transparency not working properly when using OpenGL 3.2

Hey,

I am raising an issue with transparency since Arturo asked me to do so after posting in the forum about some trouble I was having.

https://forum.openframeworks.cc/t/ofmaterial-and-opengl/32171/5

I noticed this problem occurring after changing the settings in main() from the default settings to the following:

ofGLWindowSettings settings;
settings.setSize(1200, 800);
settings.setGLVersion(3, 2);
ofCreateWindow(settings);
ofRunApp(new ofApp());

After setting it up like this so I could use my own custom shaders, anything in my scene that was transparent was now opaque and some of my other uses of ofMaterial weren't working.

I have made a simple sketch for testing this with a cube whose transparency can be controlled with the arrow keys.

src.zip

Cheers,
Eoin

Start with the attached src.zip and the window setup in main(), comparing the default OpenGL settings with settings.setGLVersion(3, 2). Reproduce the cube sketch and use the arrow keys to check transparency and the reported ofMaterial behavior. Done means transparent scene elements and the demonstrated material uses work correctly with OpenGL 3.2.