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    $\begingroup$ Turning on transform feedback doesn't normally cause rendering to stop, no. (There's a separate toggle for that, GL_RASTERIZER_DISCARD, if you want only the transform feedback without actually drawing anything.) In OpenGL, when things mysteriously stop rendering it's usually because of an error. I see that you are checking glGetError, but have you checked the info log for the program after linking? (glGetProgramInfoLog) There might be more information in there. Also, try sprinkling more glGetError calls, or using Debug Output. $\endgroup$ Commented Jul 26, 2021 at 23:56