Posted by Martin on Dec 29, 2020; 11:53am
URL: https://forum.jogamp.org/Polygon-Offset-Fill-implementation-example-code-tp4040919p4040937.html

I was finally able to workaround this by using glDepthRange instead

// Draw underlying geometry
glDepthRange (0.1, 1.0);  
drawPolygonFace();

// Draw overlying geometry
glDepthRange (0.0, 0.9);
drawPolygonWireframe();

This deals with the need to draw coplanar geometries.

More details here : https://github.com/jzy3d/jGL/issues/3