https://github.com/opengl-tutorials/ogl/blob/master/tutorial03_matrices/tutorial03.cpp#L100
In the render loop, glClear( GL_COLOR_BUFFER_BIT) is called. This leads to no output, which I was able to fix by changing to glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
https://github.com/opengl-tutorials/ogl/blob/master/tutorial03_matrices/tutorial03.cpp#L100
In the render loop,
glClear( GL_COLOR_BUFFER_BIT)is called. This leads to no output, which I was able to fix by changing toglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)