Posted by jmaasing on Sep 29, 2014; 6:46am
URL: https://forum.jogamp.org/Seeking-Help-with-OpenGL-Depth-Buffer-Issue-tp4033219p4033233.html

I can't spot anything obvious but that doesn't mean it isn't something obvious, it usually is :-)
you can set the vertex color to the position.z and see if they are indeed different. Might help in tracking down if there is an error in the matrices or something in the depth testing.