Posted by gouessej on Jul 30, 2019; 11:14am
URL: https://forum.jogamp.org/offscreen-rendering-and-taking-screenshot-tp4039872p4039889.html

Hello

Sorry but I don't see why JOGL would be to blame here. It's not a bug, maybe the frustum isn't the same in both cases.

Please provide a SSCCE.

Maybe you could use AWTGLReadBufferUtil and look at the existing tests and examples.